electrician - semester ii - cits - module 1: three phase and single phase induction motor ·...

Electrician - Semester II - CITS - Module 1: Three Phase and Single Phase Induction Motor

Questions: Level 1 1 What is the formula to calculate the slip

speed (Nslip) of 3 phase squirrel cage induction motor?

A Nslip = Ns - Nr B Nslip = Nr - Ns

C r

rsslip N

NNN

−=

D s

rsslip N

NNN

−=

2 What is the type of control circuit?

A Inching control B ON remote control C OFF remote control D Forward & reverse control 3 What is the name of the A.C motor starter?

A DOL starter B Auto transformer starter C Semi automatic star delta starter D Fully automatic star delta starter

4 What is the formula to calculate synchronous speed of a A.C 3 phase induction motor?

A P

120F = speed sSynchronou

B F

120P = speed sSynchronou

C FP

120 = speed sSynchronou

D 120PF = speed sSynchronou

5 What is the fuse rate to run a 10 HP three phase induction motor at full load?

A 10 A B 15 A C 25 A D 30 A 6 What is the name of the contact marked ‘X’?

X

A Star contact B Delta contact C Auxiliary contact D Over load relay contact 7 Which formula is used to calculate

percentage slip of an AC 3 phase induction motor?

A 100 x sN

rNsN = S %

−

B 100 x sN

sNrN = S %

−

C 100 x rN

rNsN S %

−=

D 100 x rN

sNrN S %

−=

- NIMI Question Bank - Page1/ 10

8 Which operation the control circuit is used?

A Remote control B Jogging/Inching C Sequential control D Forward and reverse 9 What is the name of the part marked ‘X’?

A Shaft B Brushes C Bearings D Slip rings 10 Which speed is called as synchronous speed

in 3 phase induction motor? A No load speed B Full load speed C Rotating magnetic field speed D Relative speed between stator and rotor 11 What is the name of the starter symbol?

A D.O.L starter B Auto transformer starter C Automatic star/delta starter D Semi automatic star/delta starter 12 What is the name of the starter symbol?

A Star delta starter B Rheostatic starter C Direct on-line starter D Autotransformer starter

13 What is the working principle of single phase induction motor?

A Lenz’s law B Joule’s law C Faraday’s laws of electrolysis D Faraday’s laws of electromagnetic induction 14 What is the name of single phase motor?

A Permanent capacitor motor B Induction start capacitor run motor C Capacitor start capacitor run motor D Capacitor start induction run motor 15 What is the name of single phase motor?

A Universal motor B Permanent capacitor motor C Capacitor start induction run motor D Capacitor start capacitor run motor 16 Which is the application of universal motor? A Jet pump B Food mixer C Teleprinter D Compressor 17 Which single phase motor is fitted with

wound rotor? A Repulsion motors B Shaded pole motors C Permanent capacitor motors D Capacitor start capacitor run motors 18 Which type of single phase induction motor

is used in food mixer? A Universal motor B Repulsion motor C Shaded pole motor D Permanent capacitor motor


19 Which motor is used in table fan? A Universal motor B Shaded pole motor C Eddy current motor D Permanent capacitor motor


Questions: Level 2 1 What is the synchronous speed of a A.C 3

phase induction motor having 6 poles at a frequency of 50 Hertz?

A 800 rpm B 1000 rpm C 1200 rpm D 1440 rpm 2 Calculate the percentage slip in a 3 phase

induction motor having 6 poles with a frequency of 50 Hertz rotating with actual speed of 960 rpm?

A 2% B 3% C 4% D 5% 3 What is the rotor frequency of a 3 phase

squirrel cage induction motor at the time of starting?

A Equal to supply frequency B 3 times less than supply frequency C 3 times more than supply frequency D times less than supply frequency 4 How the voltage is received in the rotor of

induction motor? A Direct connection from stator B Due to back emf produced in stator C Direct connection to rotor from supply D By the transformer action of stator and rotor 5 Which method is applied to control the speed

of 3 phase squirrel cage induction motor from its rotor side?

A Cascade operation B Changing applied voltage C Changing applied frequency D Changing the number of poles 6 Which loss of 3 phase induction motor is

determined by blocked rotor test? A Copper loss B Friction loss C Hysteresis loss D Eddy current loss 7 What is the purpose of using thermal cutout

in addition to fuse in A.C motor circuit? A Protect from heavy load B Protect against high voltage C Allow for continuous over loading D Protect against dead short circuit

8 Which motor is used to provide high starting torque at variable speed?

A Universal motor B Permanent capacitor motor C 3 Phase slip ring induction motor D 3 Phase single squirrel cage induction motor 9 What is the relation between torque and slip

in an A.C induction motor? A Slip increases torque decreases B Slip increases torque increases C Slip decreases torque increases D Slip decreases torque decreases 10 Why the rotor bars are mounted in a slightly

skewed position in 3 phase motor?

A Generate maximum flux B Reduce the stray losses C Maintain the rotor speed constant D Produce more uniform rotor field and torque 11 Which loss is determined by no load test of 3

phase induction motor? A Iron loss B Copper loss C Friction loss D Windage loss 12 Which method of speed control two variable

speeds only obtained in 3 phase motor? A By rotor rheostat control B By changing applied frequency C By changing the applied voltage D By changing the number of stator poles 13 Why slip ring induction motor is fitted with

wound rotor? A To reduce the slip B To control the speed C To reduce the losses D To get high starting and running torque 14 What is the function of timer in automatic star

delta starter? A Trip at over load B Switch ON at pre set time C Change from star to delta D Switch OFF at pre set time


15 Which instrument is used to measure insulation resistance of a 3 phase induction motor?

A Megger B Multimeter C Shunt type ohmmeter D Series type ohmmeter 16 What is the starting current of an A.C 3

phase induction motor? A 1 to 2 times of full load current B 2 to 3 times of full load current C 4 to 5 times of full load current D 5 to 6 times of full load current 17 Which method is used to control the speed of

3 phase induction motor from stator side? A By cascade operation B By rotor rheostat control C By injecting emf in rotor circuit D By changing the applied frequency 18 What is the speed control method of 3 phase

induction motor?

A Cascade operation method B Rotor rheostat control method C Changing applied voltage method D Injecting emf in rotor circuit method 19 What are the two functional circuits

incorporated with a three phase motor starter?

A Open circuit and short circuit B Closed circuit and open circuit C Short circuit and closed circuits D Control circuit and power circuit 20 Which type of starter is used to start and run

the 3 phase slip ring induction motor? A Direct on-line starter B Rotor rheostat starter C Auto transformer starter D Manual star-delta starter 21 Where the panel boards are used? A Industrial motor drives B Single phase domestic wiring circuits C 3 phase domestic wiring D Load distribution for AC & DC supply

22 Determine the torque in newton metres produced by a 7.5 HP squirrel cage motor rotating at 1440 rpm?

A 21.63 Nm B 24.4 Nm C 33.05 Nm D 36.6 Nm 23 Which type of handle design of rotary switch

is illustrated?

A Knob B Lever C Coin slot D Key operation 24 What is the purpose of using rotor resistance

starter to start 3 phase slip ring induction motor?

A Reduce rotor voltage B Reduce rotor current C Increase the torque D Reduce the power loss 25 Which method of speed control is only

applicable for 3 phase slipring induction motor?

A Cascade operation method B Rotor rheostat speed control C Changing the applied frequency method D Changing the number of stator poles method 26 Which type of A.C single phase motor is

classified under commutator motor type? A Stepper motor B Repulsion motor C Shaded pole motor D Permanent capacitor motor 27 Which method is adopted to start the single

phase induction motor? A Split phase method B Varying supply voltage method C Reversal of input supply terminals D Reversal of running coil connection


28 What is the type of A.C single phase motor?

A Permanent capacitor motor B Capacitor start capacitor run motor C Induction start induction run motor D Capacitor start induction run motor 29 What is the purpose of the capacitor (C) in

centrifugal switch speed control method of universal motor?

A Maintain constant speed B Improve the power factor C Protect from the over loading D Reduce the sparks on the contacts 30 Which type of AC single phase motor having

low starting torque? A Induction start induction run motor B Capacitor start induction run motor C Capacitor start capacitor run motor D Resistance start induction run motor 31 What is the function of centrifugal switch in

single phase motors? A Maintain constant speed B Break the starting winding C Break the running winding D Protect the motor from over loading 32 What is the relation between running winding

and starting winding of a single phase induction motor with respect to resistance?

A Both resistances will be equal B Running winding is less, starting winding

more C Running winding is more, starting winding

less D Running winding is less, starting winding

33 What is the function of the part marked ‘x’ in shaded pole motor?

A Increase the efficiency B Maintain constant speed C Initiate the rotor movement D Strengthen the magnetic field 34 How the direction of rotation of a capacitor

start induction run motor is reversed? A By changing the supply terminals B By changing the capacitor connections C By interchanging main winding terminals D By interchanging both main and auxiliary

winding terminals 35 Which single phase motor tapped field speed

control method is employed? A Universal motor B Shaded pole motor C Capacitor start induction run motor D Capacitor start capacitor run motor 36 What is the angular displacement between

starting and running winding of a single phase induction motor?

A 45 electrical degree B 60 electrical degree C 90 electrical degree D 120 electrical degree 37 Why the hysteresis motor is suitable for

sound recording instruments? A Small in size B High efficiency C Noiseless operation D Less error operation 38 Which motor is preferred for domestic water

pumps? A Universal Motor B Repulsion motor C Shaded pole motor D Capacitor start motor


39 How to produce starting torque in a shaded pole fan motor?

A Using rings on poles B Using capacitor on winding circuits C Interchanging cage rotor windings by switch D Interchanging the field coil windings by

switch 40 What is the reason to use a permanent

capacitor in fan motor circuit? A Speed regulation B Lower power consumption C Splitting of phase for torque D Controlling electrical interference 41 Why running winding is placed in the bottom

of the core? A To get low resistance B To get low inductance C To get high resistance D To get high inductance 42 What is the application of shaded pole

motor? A Hair dryer B Ceiling fan C Wet grinder D Washing machine 43 Which type of single phase motor is used for

hard disk drives? A Stepper motor B Repulsion motor C Hysteresis motor D Reluctance motor 44 What is the function of centrifugal switch

used in capacitor start, capacitor run induction motor?

A Disconnect the running winding after reached 75% to 80% speed

B Disconnect the starting winding after reached 75% to 80% speed

C Disconnect the starting capacitor after reached 75% to 80% speed

D Disconnect the starting and running winding after reached 75% to 80% speed

45 Which type of single phase motor is having very high starting torque than any other type of single phase motor?

A Universal motor B Reluctance motor C Repulsion start induction run motor D Capacitor start induction run motor

46 What is the effect of A.C induction motor if rotor bar is open circuited?

A Vibration of shaft B Motor will not start C Runs in slow speed D Over heating of motor 47 Which type of AC induction motor is used in

textile mills ? A Slip ring induction motor B Deepcut bar induction motor C Single squirrel cage induction motor D Double squirrel cage induction motor 48 Which type of motor takes higher starting

current and works at low power factor? A Repulsion motor B Permanent capacitor motor C Induction start, induction run motor D Capacitor start, capacitor run motor 49 Which type of motor is used for fax

machines? A Stepper motor B Universal motor C Repulsion motor D Hysteresis motor 50 Which single phase motor has higher power

factor? A Universal motor B Split phase motor C Shaded pole motor D Capacitor start induction run motor


Questions: Level 3 1 Why external resistance is included in the

rotor circuit at starting through 3 phase slipring induction motor starter?

A To get high running torque B To get high starting torque C To reduce the load current D To get increased speed at starting 2 What is the effect of motor, if the rotor

windings in slipring induction motor is open circuited at starting?

A Will not run B Runs at slow speed C Runs at very high speed D Runs but not able to pull load 3 What is the effect on 3 phase induction

motor if one phase is cut-off during running with load?

A Motor stops at once B Motor will run normally C Motor runs with humming noise with slow

speed D Motor will run slow speed but winding will be

burnt out shortly 4 What is the defect if starter with single

phasing preventer does not switch ‘ON’? A Improper phase sequence B Fluctuations in line voltage C Loose contact in supply lines D Wrong terminal connections at motor 5 What is the defect in AC 3 phase induction

motor runs at low speed if loaded? A Wrong motor connection B Wrong starter connection C Open circuit in rotor winding D Partially shorted in stator winding 6 Which fault condition thermal overload relay

protects A.C induction motor? A Short circuit B Open circuit C Over current D Under voltage 7 What happens to the rotor of a 3 phase

induction motor if its speed attains to synchronous speed?

A Rotor speed reduces B Rotor speed increases C Rotor speed remains same D Rotor bars get damaged

8 What is the effect of open circuit in rotor of an induction motor?

A Motor does not start B Over heating in motor C Excess vibration of shaft D Motor runs with very low speed 9 What is the reason for frequent blowing of

fuse after motor running some time? A Improper earthing B Over loading of motor C Heavy voltage fluctuation D Poor insulation in winding 10 What happens to a 3 phase induction motor,

if one phase fails during starting? A Motor runs and stop immediately B Motor runs in slow speed continuously C Motor runs and draws more current D Motor continues to run with irregular speed 11 Which is the cause for the 3 phase motor

starter with single phase preventer trips frequently?

A Incorrect fuse ratings B Unbalanced line voltages C Incorrect settings of OLR D Improper phase sequence 12 Where the capacitor is connected in a single

phase permanent capacitor motor? A In series with starting winding B In series with running winding C In parallel with starting winding D In parallel with running winding 13 What is the effect in a repulsion motor, if the

magnetic axis shifted to another side?

A Direction of rotation will change B Direction of rotation remains same C Motor speed increases from rated speed D Motor speed will reduce from rated speed


14 What is the effect if the centrifugal switch is not disconnected after the motor starts?

19 What is the defect while a 3 phase motor over heated if loaded?

A Loose rotor bars


A Motor will run normally B Defective bearing B Motor will stop immediately C Short in stator winding C Starting winding will burn out D Wrong terminal connections D Motor will run very slow speed 20 Why high contact resistance is provided at

brushes in universal motor? 15 How the direction of rotation of repulsion

motors is to be reversed? A To increase the torque A By shifting the brush-axis B To increase the efficiency B By interchanging the supply terminals C To reduce sparking at brushes C By changing the main winding terminals D To reduce the armature current D By changing the compensating winding

terminals 21 Which is the cause for the universal motor fails to start? 16 How the radio interference can be

suppressed in centrifugal switch method of speed control of universal motor?

A Tight bearing B Insufficient current C Incorrect grading of brush A By connecting capacitor across centrifugal

switch D Open circuited field or armature 22 How the good working capacitor can be

identified when it is tested by ohm meter? B By connecting capacitor in series with

centrifugal switch C By adding compensating winding with

armature A The needle deflects to centre position

D By connecting an inductor in series with centrifugal switch

B The needle will be in zero position but will not go to infinity side

C The needle will not go to zero position and remains in infinity side 17 What is the reason if the handle of the

Star/Delta starter shown in the figure does not hold at delta position?

D The needle deflects towards zero and then move towards infinity slowly

A hold on coil circuit is open at delta position B hold on coil circuit will not get the potential

difference in delta

C motor terminal connection at delta position is not correct

D connection is such that the hold on coil circuit will function at star but not in delta.

18 Calculate the speed of a 4.4 KV 6 pole alternator running at 1200 rpm supplies energy to an induction motor which has 4 poles at 2 % slip?

A 1470 I/min (rpm) B 1500 I/min (rpm) C 1764 I/min (rpm) D 1800 I/min (rpm)

Module 1 : Three Phase and Single Phase Induction Motor - Key paper

Questions: Level 1 Questions: Level 2 Question: Level 3

SL.No Key SL.No Key SL.No Key SL.No Key 1 A 1 B 34 C 1 B 2 A 2 C 35 A 2 A 3 B 3 A 36 C 3 D 4 A 4 D 37 C 4 A 5 C 5 A 38 D 5 D 6 C 6 A 39 A 6 C 7 A 7 C 40 C 7 D 8 B 8 C 41 D 8 D 9 D 9 B 42 A 9 D 10 C 10 D 43 A 10 A 11 B 11 A 44 C 11 C 12 A 12 D 45 A 12 A 13 A 13 D 46 D 13 A 14 A 14 C 47 D 14 C 15 D 15 A 48 C 15 A 16 B 16 D 49 D 16 A 17 A 17 D 50 D 17 A 18 A 18 A 18 C 19 D 19 D 19 A 20 B 20 C 21 C 21 D 22 D 22 D 23 C 24 C 25 B 26 B 27 A 28 D 29 D 30 D 31 B 32 B 33 C


Electrician - Semester II - CITS - Module 2: Alternators and Synchronous Motor

Questions: Level 1 1 Which formula is used to calculate

EMF/phase E in a ideal alternator? A B C E = 2.22 ɸ FT D E = 4.44 ɸ FT 2 Which rule is used to find the direction of

induced emf in an alternator? A Cork screw rule B Right hand palm rule C Fleming’s left hand rule D Fleming’s right hand rule 3 What is the name of the part of alternator?

A Stator B Exciter C Salient pole rotor D Smooth cylindrical rotor 4 What is the formula to calculate emf

equation of an alternator considering Kc and Kd?

A E = 4.44 Kd KcT φ B E = 2.22 Kd Kc Fφ C E = 4.44 Kd Kc FφmT D E = 1.11 Kd Kc Fφ 5 How alternators are rated? A KVA B KW C MW D KV

6 Which formula is used to calculate the percentage voltage regulation (VR) in alternator?

A 100V

VVV%FL

NLFLR ×

−=

2.22FTE φ

=B 100

VVV

V%FL

FLNLR ×

−=

4.44FTE φ

=C 100

VVV

V%NL

FLNLR ×

−=

D 100V

VVV%

NL

NLFLR ×

−=

7 What is the supply frequency of an alternator having 6 poles runs at 1000 rpm?

A 25 Hz B 40 Hz C 50 Hz D 60 Hz 8 What is the name of the converter?

A Metal rectifiers B Rotary convertor C Mercury arc rectifiers D Motor-Generator set 9 Which 3 phase motor can be started only

with pony motor? A Synchronous motor B Squirrel cage induction motor C Wound rotor motor D Double cage motor.


10 What is the working principle of an alternator?

A Self induction B Mutual induction C Electro - magnetic induction D Electro - static 11 How many slip rings are in the 3 phase star

connected stationary armature type alternator?

A 1 B 2 C 3 D 4 12 What is the angle difference between any

two armature of 3 phase delta connected alternator?

A 90° B 120° C 150° D 180° 13 What is the wave form of output voltage of

an rotating field type alternator? A Sine wave B Square wave C Triangular wave D Saw - tooth wave 14 Which instrument used to find the instant of

closing the switch which connects the alternators in parallel?

A Techo meter B Phase sequence C Telescope D Sychroscope 15 What is the name if the part of an

alternator?

A Double cage rotor B Projecting pole rotor C Salient pole rotor D Smooth cylindrical rotor

16 What is the term used to state the order in which the 3 phase voltage reach their maximum value?

A Phase sequence B Wave form C Phase displacement D Angular displacement 17 Which part is used to collect the alternating

current from the armature of an alternator? A Slip ring B Commutator C Stator terminals D Armature terminals


Questions: Level 2 1 Calculate the speed of an alternator having

2 poles at a frequency of 50 Hz? A 1500 rpm B 2500 rpm C 3000 rpm D 6000 rpm 2 What condition the lamps become dark in

dark lamp method of parallel operation of two alternators?

A Terminal voltages are equal B Voltage and frequency are equal C Voltage and power rating are equal D Frequency are same in both alternator 3 What is the use of synchroscope? A Adjust the output voltage B Adjust the phase sequence C Adjust the supply frequency D Indicate the correct instant for paralleling 4 What is the name of the equipment that

provides D.C to the rotor of alternator? A Exciter B Inverter C Converter D Synchroniser 5 What is the purpose of damper winding in

alternator? A Reduces the copper loss B Reduces windage losses C Reduces the hunting effect D Improves the voltage regulation 6 Which condition is to be satisfied before

parallel operation of alternators? A Rating must be same B Phase sequence must be same C Rotor impedance must be same D Stator impedance must be same 7 What is the speed of an alternator

connected with a supply frequency of 50 Hz at rated voltage having 4 poles?

A 1000 rpm B 1500 rpm C 3000 rpm D 4500 rpm

8 What condition the two lamps become bright and one lamp dark during paralleling of two alternators?

A Terminal voltages are equal B Voltages and frequencies are equal C Voltages and phase sequence are equal D Both the alternators receive same frequency 9 What causes the terminal voltage of an

alternator reduces, if the load increases? A Field resistance B Armature reaction C Inductive reactance D Armature resistance 10 What is the type of alternator?

A Brushless alternator B Three phase alternator C Single phase alternator D Salient pole type alternator 11 Calculate the speed in r.p.s of the 2 pole,

50Hz alternator? A 50 rps B 100 rps C 1500 rps D 3000 rps 12 What is the advantage of using rotating field

type alternator? A Easy to locate the faults in the field B Easy to connect the load with alternator C Easy to dissipate the heat during running D Two slip rings only required irrespective of

No. of phases 13 What is the effect in increasing the field

excitation current in alternator? A Prevents demagnetising B Over voltage protection C Dead short circuit protection D Alternator will be over loaded


14 Why D.C supply is necessary for synchronous motor operation?

A Reduce the losses B Start the motor initially C Run the motor with over load D Run the motor at synchronous speed 15 Which acts as both inverter and converter? A Metal rectifier B Mercury arc rectifier C Semi conductor diode D Synchronous converter 16 Why exciter is essential to run a

synchronous motor? A Carry more load in motor B Improve the power factor C Reduce the losses in motor D Run the motor at synchronous speed 17 Which is the main application of

synchronous motors? A Elevators B Paper rolling mills C AC to DC converter D Power factor correction device 18 What is the advantage of motor generator

set? A Noiseless B High efficiency C Low maintenance required D DC output voltage can be easily controlled 19 What is the function of the part marked ‘X’ of

the rotary converter?

A Converts AC to DC B Reduces voltage drop C Helps to deliver without noise D Collects the delivered direct current

20 Which characteristic is applicable to synchronous motors?

A Runs at variable speed at all loads B Suitable to supply only electrical load C Can not be used for PF improvement D Not self starting 21 How the generated AC is connected to the

load in a stationary magnetic field type alternator?

A Through split rings B Directly through terminal connection C Through commutator D Through slip rings 22 Which method is easy to check the phase

relation of both alternators during parallel operation?

A Using all dark lamp method B Using a synchroscope C Checking by a phase sequence indicator D Checking by bright and dark lamp method 23 What factor the amount induced emf

depends upon? A Number of poles of alternator B Change of speed of alternator C Rate of change of flux linkage D Direction of rotation of the alternator 24 How the salient pole rotor could be

identified? A By its larger diameter and longer axial

length B By its larger diameter and shorter axial

length C By its shorter diameter and larger axial

length D By its shorter diameter and shorter axial

length 25 How the smooth cyclindrical type rotor could

be identified? A By its larger diameter and longer axial

length B By its larger diameter and shorter axial

length C By its shorter diameter and larger axial

length D By its shorter diameter and shorter axial

length


26 Where the damper winding is palced in an alternator?

A In the pole shoe B In the armature C In the shaft D In the exciter 27 Which test of alternator is illustrated in this

circuit?

A Continuity test between armature windings B Continuity test between field windings C Earth test between winding and body D Insulation resistance test between armature

and field windings 28 Which test of alternator is illustrated in this

circuit?

A Continuity test field armature windings B Insulation test between armature and body C Insulation test between armature and field D Insulation test between field and body 29 How many cycles will be completed, if a coil

of a 4 pole alternator under goes one revolution?

A 1 B 2 C 3 D 4 30 Which instrument used to check the phase

sequence of alternators? A Synchroscope B Phase sequence meter C Techo meter D Frequency meter

31 What is the disadvantage in salient pole type rotor?

A Having move space for field B Having diffcult to obtain mechanical

balancing C Having more space for heat dissipation D Having projecting field poles 32 What is the draw back of open type

armature slots? A Difficult for placing form wound coils B Not easy to remove and replace the coils C Uneven distribution of the magnetic flux D Uneven air gap between stator and rotor 33 Why alternator is rated in KVA? A Output KW is proportional to power factor B It consumes apparent power C Power consumed is in KVA D To consider reactive power 34 What is the purpose of earthing neutral

conductor in alternators? A To reduce the power losses B To protect the operators from shock C To maintain proper voltage in the system D To bring down the leakage potential to zero 35 Which loss is eliminated by using laminated

steel cores in armature of an alternator? A Copper loss B Windage loss C Hysteresis loss D Eddy current loss 36 What is the function of damper windings in

synchronous motor? A Maintain power factor B Excite the field winding C Maintain constant speed D Start the synchronous motor


Questions: Level 3 1 Calculate the pitch factor (KP) for a winding

having 36 stator slots 4 pole with angle (α) is 30° in alternator?

A 0.942 B 0.965 C 0.978 D 0.985 2 What is the cause for hunting effect in

alternators? A Due to over load B Running without load C Running with fluctuation of speed D Due to continuous fluctuation in load 3 How to compensate de-magnetizing effect

due to armature reaction in an alternator? A By reducing the speed of alternator B By increasing the speed of alternator C By increasing the field excitation current D By decreasing the field excitation current 4 Calculate the voltage regulation in

percentage if the load is removed from an alternator, the voltage rises from 480V to 660V?

A 27.20% B 32.50% C 37.50% D 38.50% 5 Why the synchronous motor fails to run at

synchronous speed? A In sufficient excitation B Defective pony motor C Open in damper winding D Short in damper winding 6 How the synchronous motor is used as a

synchronous condenser? A Varying the motor load B Varying the rotor excitation C Varying stator voltage in motor D Varying stator current in motor

7 How synchronous motor works as a power factor corrector?

A Varying the line voltage B Varying the field excitation C Increasing the speed of motor D Decreasing the speed of motor 8 Which is the cause for the lamps are dark at

different timings , during synchronising of alternator?

A Frequency B Speed C Phase sequence D Voltage 9 Calculate the distribution factor (Kd) of single

phase alternator has the winding housed in 3 slots per pole and the slots in groups of three being 20° apart?

A 0.85 B 0.92 C 0.94 D 0.96 10 How the frequency of incoming alternator

can be changed? A By changing the level of excitation B By changing the speed of prime mover C By changing the direction of excitation D By interchanging any two terminals of

alternator 11 How the phase sequence of the incoming

alternator can be changed? A By adjusting the speed of alternator B By changing level of excitation C By adjusting the fuel inlet level of prime

move D By interchanging any two terminals of

alternator


12 What is the defect, if the megger reads zero mega Ohm?

A Short circuit between armature windings B Short circuit between armature and field

winding C Earth fault between armature winding and

body D Earth fault between field winding and 13 What is the defect, if the megger reads zero

mega Ohm?

A Short circuit between the armature windings B Short circuit between the armature and field

winding C Earth fault between field winding and frame D Earth fault between armature winding and

frame 14 Which load, the terminal voltage of an

alternator will slightly fall? A Resistive B Inductive C Dielectric furnace D Induction furnace 15 What happens If phase sequence of two

alternators are not same, while parallel operation?

A Work, but with less power B Short circuit C Voltage fluctuates D Incoming machine acts as motor

16 Calculate pitch factor for a winding having 36 stator slots, 4 poles with coil span of 1 to 10?

A 0.94 B 1 C 0.87 D 98 17 What is the reason if the alternator is initally

loaded with resistive load , the voltage decreases but the voltage is increased after further loading?

A The winding heat increased B Higher flux in armature C Due to automatic voltage regulator D Prime mover input reduced 18 How the additional load can be added to the

alternator? A Increase excitation voltage B Increse power input to prime mover C Increase load power, factor D Increase excitation current 19 When the minimum armature current is

drawn in synchronous motor? A At normal excitation B With over excitation C With under excitation D Above normal excitation 20 What happens when synchronous motor is

loaded beyond pull out troque? A Motor will stop B Motor will run with less speed C Motor speed fluctuated D Runs as generator 21 How much load current will be supplied by a

400V, 3 phase alternator to 1.73KW lamp load?

A 4.32 A B 2.5 A C 2.3 A D 4.5 A



22 Which is used to prevent the hunting effect in alternator?

A Compensating winding B Stator winding C Damper winding D Rotor winding 23 How to compensate de-magnetizing effect

due to armature reaction in an alternator? A Reducing the speed of alternator B Reducing field excitation current C Increasing field excitation current D Increasing the speed of alternator

Module 2: Alternators and Synchronous Motor - Key paper


SL.No Key SL.No Key SL.No Key 1 D 1 C 1 B 2 D 2 B 2 D 3 C 3 D 3 C 4 D 4 A 4 C 5 A 5 C 5 A 6 B 6 B 6 B 7 C 7 B 7 B 8 B 8 B 8 C 9 A 9 D 9 D 10 C 10 A 10 B 11 B 11 A 11 D 12 B 12 D 12 B 13 A 13 A 13 C 14 D 14 D 14 A 15 D 15 D 15 B 16 A 16 D 16 A 17 A 17 D 17 C 18 D 18 B 19 D 19 A 20 D 20 A 21 D 21 B 22 C 22 C 23 C 23 C 24 B 25 C 26 A 27 D 28 D 29 B 30 B 31 B 32 C 33 A 34 C 35 D 36 D


Electrician CITS - Semester- II Module 3: Small Transformer and DC Machine Winding

Questions: Level 1 1 Which instrument is used to measure

armature winding resistance? A Megger B Multimeter C Series type Ohm meter D Kelvin bridge 2 Which winding wire is used for DC field coil? A Super enameled copper wire B Single silk covered copper wire C Double silk covered copper wire D PVC covered copper winding wire 3 How many parallel paths in duplex lap

winding in the armature of 4 pole D.C Motor?

A 2 B 4 C 6 D 8 4 What is the name of the equipment?

A Megger B Earth resistance tester C Internal growler D External growler 5 What is the name of winding, if coil pitch is

less than pole pitch? A Full pitch winding B Half pitch winding C Long chorded winding D Short chorded winding

6 Identify the number of poles in the winding ?

A 2 B 4 C 6 D 8 7 Which part of the core is to be referred to

calculate cross section area ?

A Centre limb B Yoke C Any one of outer limb D Window 8 Which term refers the winding ? A Resistance B Capacitance C Inductance D Permeability 9 What is the name of the winding . If the end

is not overlaped each other? A Flat loop winding B Concentric winding C Diamond coil winding D Chain winding



Questions: Level 2 1 Which insulating material belongs to class

‘B’ insulation? A Cotton B Bamboo C Fibre glass D Leatheroid paper 2 What is the temperature value of class ‘F’

insulation? A 90°C B 105°C C 120°C D 155°C 3 Which is the most effective method of

balancing armature? A Static balancing B Dynamic balancing C Attached with counter balancing D Plugged with lead weight balancing 4 Which type of armature winding is

illustrated?

A Duplex lap winding B Triplex lap winding C Simplex lap winding D Quadruplex lap winding 5 Which growler test for armature is

illustrated?

A Open coil test B Ground coil test C Shorted coil test D Shorted commutator tests

6 What is the purpose of tapes in winding? A Insulate slots B Bind the coils C Wrap the conductor D Insulate exposed conductors 8 Which type of DC armature winding the front

pitch (YF) is greater than back pitch (YB)? A Lap winding B Wave winding C Progressive winding D Retrogressive winding 9 How to obtain opposite polarity in adjacent

poles into a 4 pole DC motor? A Varying the number of turns in coil B Making series connection of coils C Making parallel connection of coils D Making current flow in different direction 10 What is the operation in the rewinding

process?

A Cleaning of slots B Removing of winding C Removing of wedges D Cutting of winding wire 11 Which insulating material used in winding is

a highly non -hygroscopic and possess good electrical strength?

A Empire cloth B Triplex paper C Millinex paper D Leatheroid paper

12 Which type of armature winding is illustrated?

A Triplex wave winding B Duplex wave winding C Progressive lap winding D Retrogressive lap winding 13 Calculate the average pitch (YA) for

retrogressive wave winding, if No. of armature conductor = 14 No. of slots = 7 No. of poles = 2 A 4 B 6 C 8 D 14 14 Which type of test is illustrated for the

armature after rewound?

A Open coil test B Shorted coil test C Voltage drop test D Grounded coil test 15 Why the newly rewound armature must be

preheated before varnishing? A Drive out the moisture from it B Help for quick drying of varnish C Make easy to penetrate varnish inside D Maintain uniform spreading of varnishing

16 Which type of test for armature is illustrated?

A Test for shorted commutator. B Test for grounded commutator. C Insulation resistance test between

Commutator segments D Growler test for grounded Commutator

segments. 17 Why the enamel coating is to be applied in

winding ? A It gives red colour appearance B It gives nice fragrance C It gives high insulation D It acts as heating elements 18 What is the purpose of Bamboo in

rewindings ? A To keep extra coil B Increase the size of the slot C Prevents the coil from coming out during

operation D Dummy slot making 19 Which insulating material is used for

rewinding ? A Leatheroid paper B Rubber C P.V.C D Bakelite 20 Which refers Double layer winding? A Each slot contains 3 coils sides B Each slot contains 4 coils sides C Each slot contains 2 coils sides D Each slot contains one coils side 21 Where the damper windings are placed in

motor? A Bearing B End closure C Rotor D Stator


22 Which type of transformer, sandwiched type of winding is used?

A In current transformer B In core type transformer C In shell type transformer D In potential transistor 23 Which winding wire is used for transformer

having more cross sectional area ? A Copper winding B Steel winding C Aluminium winding D Iron winding 24 Which winding has more number of turns? A Low voltage winding B High voltage winding C Centre tap winding D Secondary winding 25 Which part of transformer is mostly affected

from over heating? A Iron core B Copper winding C Winding insulation D Frame or Case 26 What is the coil span for 4 pole, 12 slot

armature winding? A 24 B 48 C 8 D 3 27 How many commutator segments are in a 2

pole DC machine with coil span equal to 6 ? A 3 B 12 C 4 D 8 28 Which is used to test armature winding for

short and open circuit? A Tong Tester B Internal Growler C External Growler D Digital multimeter

29 Which type of lap winding is illustrated ?

A Progressive lap winding B Duplex lap winding C Retrogressive lap winding D Triplex lap winding 29 Which type of lap winding is illustrated ?

A Progressive lap winding B Duplex lap winding C Retrogressive lap winding D Triplex lap winding 30 What is the property of insulating material ? A Withstand vibrations B Conduct heavily C Have low melting point D Have moistures


Questions : Level 3 1 Which winding fault is determined by the

test?

A Open coil fault B Short coil fault C Grounded coil fault D Grounded core fault 2 What is the value if Y6 for simplex lap

winding with '4 Pole , 12 slot armature with two coil side/ slot ?

A 3 B 5 C 7 D 9 3 What is the value of YF for a lap winding with

a 4 pole, 12 slot armature with two coil side/ slot - (Assume single tuens coil - progressive winding)?

A 3 B 5 C 7 D 9 4 How the unbalanced weight of wound

armature side can be identified by static balancing method ?

A It rolls without stopping on flat surface B It stops at particular position with sucessive

rolling C It stops initial position without rollin D It stops at different position in each rolling 5 What is the value of YF for a lap winding with

a 4 pole, 12 swt armature with two coil sides/ slot - (Assume single tuens coil - retrogressive winding)?

A 9 B 3 C 11 D 5

6 What is the reading of voltmeter if the winding is short, during voltage drop test?

A Zero reading B Negative reading C Low voltage reading D High voltage reading 7 What is the type of DC armature winding, if

the coil sides are one pole pitch apart ? A Multiplex B Fractional pitch C Full pitch D Pole pitch 8 What is the spacing between the brushes for

a wave winding, if 6 pole armature with 16 slots having 2 coil sides per slot, 1 single turn coil?

A 4 segments B 8 segments C 16 segments D 12 segments 9 Calculate the current carried by a particular

brush in 2 pole machine when conductor current is 4mA?

A 16 mA B 8 mA C 2 mA D 10 mA 10 How many number of brushes required for

small and large machine respectively in wave wound armature ?

A 2,2 B 4,2 C 2,4 D 4,4 11 How many number of slots, if Spacing

between the brushes for a 4 pole m/c in term of commutator segments in equal to 6 ?

A 48 B 3 C 24 D 6 12 Which part, the temperature rise will occur

maximum if a transformer is continuously operated ?

A Core B Winding C Tank D Conversation



13 How many brushes are to be used in DC machine if brushes are placed 4 commutator segments apart for 16 commutator segments?

A 8 B 12 C 2 D 4

Module 3: Small Transformer and DC Machine Winding- Key paper


SL.No Key SL.No Key SL.No Key 1 D 1 C 1 A 2 A 2 D 2 C 3 A 3 B 3 B 4 D 4 A 4 B 5 D 5 A 5 A 6 B 6 C 6 A 7 A 7 D 7 C 8 C 8 D 8 B 9 A 9 C 9 B

10 C 10 C 11 C 11 C

12 B 12 B 13 B 13 D 14 A 15 B 16 C 17 C 18 A 19 C 20 C 21 C 22 A 23 B 24 C 25 D 26 B 27 C 28 C 29 A 30 A



Electrician - Semester II - CITS - Module 4: AC Machine winding Questions: Level 1 1 Which formula is used to calculate the total

electrical degree in stator of an A.C motor? A Total electrical degree = 180° / No. of slots B Total electrical degree = 180° x No. of slots C Total electrical degree = 180° / No. of poles D Total electrical degree = 180° x No. of poles 2 Which term represents the distance between

the two active sides of a coil? A Coil pitch B Coil group C Pole pitch D Pitch factor 3 What is the phase displacement between

windings in 3 phase motor? A 90° B 120° C 180° D 360° 4 What is the name of AC winding?

A Half coil winding B Whole coil winding C Single layer winding D Double layer winding 5 What is the name of the coil winding?

A Concentric coil winding B Distributed coil winding C Mesh shaped coil winding D Diamond mesh shaped coil winding

6 Name the part marked ‘X’ of the winding machine?

A Mandrel B Wire feed C Wire guides D Spool carrier 7 What is the electrical degree of 6 pole stator

motor? A 360° B 720° C 1080° D 1440° 8 Calculate the number of coils per phase per

pair of poles of 3 phase motor having 2 pole, 24 slots,12 coils?

A 1 B 2 C 3 D 4 9 What is the formula to calculate pitch factor?

A pitch Winding

pitch Poleor = Pitch fact

B pitch Pole

pitch Windingor = Pitch fact

C poles of Number

slots of Numberor = Pitch fact

D slots of Number

poles of Numberor = Pitch fact

10 How pole pitch is measured in terms of slots in AC winding?

A slots of Numberdegrees electrical Total

B degrees electrical Totalslots of Number

C poles of No

stator the in slots of No

D stator the in slots of No

poles of No


11 rmula to calculate the mean What is the focircumference of the coil?

A cm2

LLL inoutm

−=

B cm2LLL outin

m−

=

C cmLL

2Linout

m −=

D cmLL

2Loutin

m −=

12 s used for rewinding a Which winding wire isubmersible motor?

B pper wire

ire for

A Super-enamelled copper wire Single silk covered co

C PVC covered copper winding wireD Double cotton covered copper w13 Which is used winding wire is used

rewinding the armature of a mixer/Liquidizer

A B lled copper wire

re rical

motor ? Single silk-covered copper wire Super ename

C Single cotton covered copper wire D Double silk covered winding wi14 Which factor depends on total Elect

degrees for a 3 phase winding?

B

A No. of slots No. of poles

C No. of coils D No. of phases15 What is the n ame of winding ?

A

full pitch winding

l degrees of a 4 pole

half coil winding BC whole coil winding D series winding. 16 What is total electrica

AC machine ? A 180°

360° B C 720° D 1080°

17 What are the two methods by which polarity of field (poles) of a winding can be checked ?By Internal growler and External growler

A

ler

slot

B Magnetic compass and Search coil C Magnetic compass and Internal growD Search coil and External growler 18 Which winding is referred, if each

contains two coil sides in a 3 phase stawinding? Balanced winding

tor

A B Single layer winding C Un balanced winding D Double layer winding


Questions: Level 2 1 Why pre heating is necessary for motors

A

e

2 ype of test is conducted using

before varnishing in rewinding process? To dry the varnish quickly in winding

B To easy flow of varnish in the winding C To increase the insulation resistance valuD To drive out the moisture in between winding

layers Which tinternal growler in AC motor winding? Ground test

A

sed to test startor winding

B Polarity test C Continuity test D Short circuit test 3 Which device is u

short and open fault? Tong Tester A

is used for rewinding of

B Internal Growler C External Growler D Digital multimeter 4 Which type of wire

A.C 3 phase motors? Super enamelled copp A er wire

B PVC covered copper winding wire C Single cotton covered copper wire D Double cotton covered copper wire 5 Which material is used as wedges in

A

t in winding is essential before

winding process? Empire

B Cotton C Bamboo D Terylene 6 Which tes

giving supply? Ground test A

B Polarity test C Open circuit test D Short circuit test

7 Which test of winding is illustrated?

Polarity test

property of leatheroid

A B Ground test C Continuity test D Short circuit test 8 Which is the main

paper insulation? Non moisturized m A aterial

ation g

cted

B Highly non-hygroscopic C Very good for class F insulD Better ageing and dielectric stren th9 Which type of insulating material is sele

for binding the coils and over hangs? Cotton sleeves A

B Empire sleeves C Terylene thread D Fibre glass tape 10 Which insulation is used for cuffing in AC

A

pe e

winding? Fibre glass tape

B Leatheroid paper C Empire fiber glass taD Fabric based adhesive tap11 Which refers coil in AC winding?A Number of turns connected in series

s

B Number of turns connected in parallel C Number of turns under two similar poleD Number of turns under two dissimilar poles12 Which type of AC winding the number of

A oil winding

ng ing

coil/pole/phase is more than one at different pitches? Involute c

B Diamond coil winding C Flat loop over lapped windiD Flat loop non-over lapped wind


13 Calculate the number of coils /phase/ pole for a 3 phase double layer distributed winding for a motor having 36 slots, 36and 4 poles? 3 coils /phase/

coils

A pole

nding process?

B 6 coils / phase/pole C 9 coils / phase/pole D 12 coils/ phase/ pole14 What is the type of rewi

Hand winding

inding AB Drilling machine wC Former winding D Machine winding 15 Which operation to be carried out after

A y

rotor

baking of varnish? Varnish stripping

B Painting of stator bodC Cleaning of stator body D Assembling of stator and16 What is the function of collar?

A Provides insulation around field

g

from coil

B Provides insulation for coil tappin C Helps tightening material for flange D Provides insulation for heat transfer 17 What is the advantage of short pitch winding

of 3 phase induction motor? Easy for winding A

s ased

s ing is

B Running torque increaseC Efficiency of machine is increD Starting and running current reduce18 What is the reason of long chord wind

avoided in AC motors? Low efficiency A

ired

ss

ed for

B Low starting torqueC More winding wire requD Control the increased heat lo

19 Where the space for cooling is providwinding coils in motor? Between overhanging co A ils

B Between overhanging coil and rotor C Between overhanging coils and yoke D Between overhanging coil and wedge 20 Which type of the winding is illustrated?

Skew winding

ing

ase motor winding,

AB Skein winding C Involute coil windD Diamond coil winding 21 What is the name of 3 ph

if the coil pitch is less than pole pitch? Full pitch winding A

hase co centric

B Whole coil winding C Long chorded windingD Short chorded winding 22 Which is the demerit of 3 p n

winding? More space is required A

d uniformly

f

B A stepped former is requireC More difficult to shape the coils D It is not easy to make the end connection 23 Calculate the phase displacement in terms o

slots for a 3 phase, 36 slots, 12 coils, 4 pole stator winding? 3 slots A

e of AC motor winding having the

B 4 slots C 6 slots D 8 slots 24 Which typ

number of coil/pole/phase is more than one arranged in different slots? Basket winding A

B Concentric winding C Distributed winding D Concentrated winding

25 Which type of testing of winding is illustrated?

A Polarity test B Resistance test C Short circuit test D Voltage drop test 26 Which is irrelevant feature of AC three phase

distributed winding? A Number of coils / per pole must be equal B Size of all the coils is same C Pitch of all the coils is same D It can be a single layer or double layer 27 How the auxiliary and main winding are

placed in single phase motor winding? A Auxiliary winding housed near the tip of slot

and main winding deep in the slot B Main winding housed near the tip of slot and

auxiliary winding deep in the slot C No fixed rule for placement of windings is

applicable D Both the windings are placed deep inside the

slots to have proper phase displacement 28 How to connect the capacitor in the circuit for

testing and commissioning of table fan ? A Series with auxiliary winding permanently B Series with main winding permanently C Parallel to the supply mains D Series with starting winding at the time of

starting 29 Which is a function of insulating varnish

when applied on a newly wound motor? A Will not allow the ingress of moisture. B Bonds the conductors together C Works against the action of oil, acids,

alcalies D Cools the winding by admiting free flow of air 30 Which factor decides the permissible

temperature rise of electrical machine? A Material used for winding wire B Wedges used for winding C Insulating varnish used D Insulating materials used for winding

31 Which type of varnish is used for AC 3 phase squirrel cage induction motor after rewinding?

A Baking varnishes B Air-drying varnishes C Solventless varnishes D Thermo setting varnishes 32 Which test in an AC 3 phase stator winding

is illustrated?

A Polarity test B Insulation resistance test C Open circuit test by growler D Short circuit test by internal growler 33 What is the maximum temperature the

winding is to be preheated before varnishing?

A 40°C B 60°C C 90°C D 140°C 34 Calculate the slot distance in angle for a

ceiling fan having 28 slots, 14 poles, 14 coils in half coil connection?

A 90° B 120° C 180° D 240° 35 Which motor is having half coil winding? A Mixer B Grinder C Ceiling fan D Washing machine


Questions: Level 3 1 What indication denotes the shorted coil

defect in 3 phase motor stator winding while testing with internal growler by keeping hacksaw blade?

A Hacksaw blade gets over heated B Rapid vibration of hacksaw blade C Hacksaw blade repels against the slots D Attracted by the winding turns on the slot 2 How the corresponding labeled A1,B2,C1

terminals ends are to be marked respectively in other ends?

A A2 B1C2 B A2 C2 B1 C B1 A2 C2 D C2 B1 A2 3 Which type of coils connection for the

developed winding diagram of a 28 slots 14 coils of a ceiling fan?

A half coil connection for 28 poles B whole coil connection for 14 poles C whole coil connection for 28 poles D half coil connection for 14 poles 4 Which end connection is correct for a 32

slots, 16 coils, 16 poles ceiling fan motor winding in the figure?

A 2-4, 3-5, 6-8, 7-9, 10-12, 11-13, 14-16, 15---

MW2 B 2-3, 4-5, 6-7, 8-9, 10-11, 12-13, 14-15, 16---

MW2 C 2-3, 4-8, 7-6, 5-9, 10-11, 12-16, 15-14, 13---

MW2 D 2-4, 3-6, 5-8, 7-10, 9-12, 11-14, 13-15, 16---

MW2

5 What will happen if the overhang of the coil is more in split phase motor winding?

A The insertion of the coils will be easy B The insertion of the coils will be difficult C The coils may not allow the end cover to be

fitted D The coils may allow easily the end cover to

be fitted 6 How many coils are to be connected for both

starting and running winding if concentric winding for a capacitor motor having 24 slots 112 coils?

A Starting 6, running 6 coils B Starting 4, running 8 coils C Starting 8, running 4 coils D Starting 2, running 10 coils 7 Calculate degree/ slot of a single phase

capacitor type table fan having no of pole 4. No of slots 8, and No of coils 8

A 60° B 75° C 85° D 90° 8 Calculate the slot displacement between

main and starting winding for a single phase capacitor type table fan having 4 poles and 4 coils.

A 1 B 2 C 3 D 4 9 Calculate No of coil per pole for a single

phase capacitor type table fan 240v 50Hz having 8 slots, 4 poles an No of coils 8.

A 1 B 2 C 3 D 4 10 Why removing of heated damaged coils are

avoided in stripping the winding from starter? A Not able to measure the size of winding wire B To avoid damage to the lamination C Not able to measure the coil size D To avoid damage in body


11 Calculate the number of coils for starting and running winding for a ceiling fan number slots - 28 no. of poles -14 if it is connected for half coil connections?

17 What is effect of low graded insulating materials are used for re winding of motors?

A Insulation resistance between conductor decrease

B Insulation resistance between body and conductor decreases


A 4 coils for starting 10 coils for running B 10 coils for starting 4 coils for running

C Short circuit fault occurs C 8 coils for starting 6 coils for running D Open circuit fault occurs D 7 coils for starting and 7 coils for running

winding 18 What will happen, if the overhang of the coil is less in size of a split phase motor winding 12 Calculate the pole pitch for a ceiling fan, if

number of slots 28 number of poles 14 and number of coils 28?

A The insertion of the coils will be easy B The insertion of the coils will be difficult C The coils allow easily the end cover to be

fitted A 2 B 4

D The coils may not allow the end cover to be fitted

C 6 D 8

19 What is the effect, if coil group connection is wrongly connected in a single phase motor rewinding?

13 Calculate the slot distance in terms of degree for a ceiling fan having 28 slots, 14 poles, 14 coils half coil connection.

A Motor runs slowly A 90° B Motor will not run B 120° C Motor runs in very high speed C 180° D Motor runs and takes more current at no load D 240° 14 Why one slot gap is kept between starting &

running winding of a ceiling fan?

A To give shape to winding B To get uniform magnetic field C To give phase angle displacement D To increase the torque 15 What is the effect if some slots in a split

phase motor left without winding after completing concentric winding?

A Speed reduced B Torque reduced C Works normally D Heat increase 16 What defect will occur if over hang of a

winding increase in split phase motor?

A More copper required B Length of slot liner to be minimum C Not able to tighten the end covers D Not able to install the rotor

Module 4 : AC Machine winding - Key paper

Questions: Level 1

Questions: Level 2 Question: Level 3

SL.No Key SL.No Key SL.No Key 1 D 1 D 1 B 2 A 2 D 2 A 3 B 3 B 3 D 4 B 4 A 4 B 5 D 5 C 5 C 6 A 6 B 6 B 7 C 7 A 7 D 8 D 8 D 8 A 9 B 9 C 9 A 10 C 10 D 10 B 11 B 11 A 11 D 12 C 12 D 12 A 13 B 13 A 13 A 14 B 14 A 14 C 15 A 15 A 15 C 16 C 16 A 16 C 17 B 17 C 17 B 18 D 18 C 18 B 19 C 19 B 20 A 21 D 22 B 23 C 24 C 25 B 26 A 27 A 28 A 29 D 30 D 31 A 32 C 33 C 34 A 35 C


Electrician - Semester II - CITS - Module 5 : Rectifiers - Invertors AC/DC Drives

Questions: Level 1 1 Which control system consumes very low

power for motion control in AC and DC motors?

A Field control B Drives control C Voltage control D Armature control 2 Which drive is classified according to mode

of operation? A Group drive B Manual drive C Individual drive D Continuous duty drive 3 What is the name of the characteristic curve

in D.C drive?

A Speed Vs torque characteristic B Torque Vs field current characteristic C Speed Vs armature current characteristic D Field current Vs armature 4 What is the name of the component marked

‘X’ in the block diagram of AC drive?

A Rectifier B D.C bus C Inverter D A.C motor 5 What is electric drive? A A device used as prime mover for generator B A device converts A.C to D.C supply C An electro mechanical device for controlling

motor D A machine converts mechanical energy into

electrical

6 What is the full form of B.O.P in D.C drive? A Bridge Operation Panel B Basic Operational Panel C Basic Operation Programme D Bridge Operator Programme 7 What is the minimum permissible single

phase working voltage, if the declared voltage is 240V as per ISI?

A 233 V B 228 V C 216 V D 211 V 8 Which term refers that the mass of a

substance liberated from an electrolyte by one coloumb of electricity?

A Electrolysis B Electro plating C Electro copying D Electro chemical equivalent 9 What is the full form of abbreviation UPS? A Uniform Power Supply B Universal Power Supply C Unregulated Power Supply D Uninterrupted Power Supply 10 Which is frequency converter? A Rectifiers B D.C choppers C Cyclo converters D D.C to A.C converters 11 What is the full from of PWM? A Pulse Wide Modulation B Pulse Width Modulation C Phase Wide Modulation D Phase Width Modulation 12 Which device in A.C drive controls the speed

of A.C motor? A Field supply unit B COMMS technology bore C Speed feedback technology bore D Micro processor controlled electronic device


13 What is the relation between synchronous speed (Ns) in RPM frequency (F) in hertz and (P) of poles?

A B C D 14 What are the two main components in A.C

drive? A Rectifier and inverter B Transformer and rectifier C Transformer and inverter D Transformer and control panel 15 What is the full form of VVVFD in A.C drive? A Variable Voltage Variable Frequency Drives B Voltage Variable Very high Frequency Drives C Variable Voltage Values and Frequency

Drives D Variable Values of Voltage and Frequency

Drives 16 What is the full form VFD in A.C drive? A Volt Forward Drives B Variable Force Drives C Voltage Frequency Drives D Variable Frequency Drives 17 What is the formula to calculate

Volt/Frequency (V/F) ratio? A B V/F = 4.444 NϕM C D V/F = 4.44/xϕM2 18 How the output capacity of UPS is

expressed? A W B VA C AH D KWH

19 Which is the AC input power receptacle in UPS?

FP 120

=sN

PF 120

=sN

120PF

=sN

P 120F

=sN

A 1 B 2 C 3 D 4 20 Which is the correct equation, related to

phase voltage ‘V’ frequency ‘F’, No of turns ‘N’ and magnetic flux ϕm of the DC motor?

A V = 4.444 f N ϕm B

mNNf444.4V

φ=

C m

Nf444.4Vφ

=

D Nf

444.4V mφ=

21 Which part is provided in UPS for source of power, if supply fails?

A Rectifier B Inverter C Battery D Control relay

N

444.4F/V Mφ=

M

N444.4F/V

φ=


Questions: Level 2 1 What is the function of power controller in

drive circuits? A It sounds an alarm in no load conditions B It detects the overloading condition of motor C It reduce motor current during transient

operation D It maintain the torque at low voltage

conditions 2 Why it is necessary to keep V/F ratio

constant in a drive? A Keep the stator flux maximum B Maintain the rotor current minimum C Maintain the speed of motor constant D Maintain the rated torque at all speeds 3 Which power modulator used in the electric

drive system? A Cyclo converters B Frequency multiplier C Phase sequence indicator D Servo controlled voltage stabilizer 4 Which type of sensing unit employed in drive

system? A Opto coupler B Speed sensing C Photo voltaic cell D Resistance temperature detector 5 Which type of machine in industries is

provided with multi motor electric drive? A Rolling machine B As per supply voltage C As per no volt coil rating D Heavy duty electric drilling machine 6 Which control system is used for Eddy

current drives? A Slip controller B Rectifier controller C AC voltage controller D DC chopper controller 7 What is the purpose of JOG key in control

panel of D.C drive? A Stop the motor B Restart the motor C Inching operation D Reverse the direction of motor

8 What is the purpose of LCD on basic operator panel in D.C drive?

A Indicate the fault B Display the speed C Monitor the parameter D Display availability of supply 9 What is the reason of using shielded cable

for connecting low level signal circuits in DC drives?

A Easy for connection B Good appearance C Protects from mechanical injuries D Eliminates the electrical interference 10 Which device controls the speed of A.C

motor in A.C drive? A Field supply unit (FSU) B COMMS technology box C Speed feedback technology box D Microprocessor based electronic device 11 What is the main use of A.C drive? A High starting torque B Group drive motors C Control stepless speed in motors D Interlocking system in industries 12 What is the function of IGBT in AC drive? A Smoothening incoming A.C supply B Controls the power delivered to the motor C Stabilize the output voltage from the rectifier D Converts incoming A.C power into D.C power output 13 Why the A.C drives are better suited for high

speed operation? A High starting torque B Robust in construction C Having lighter gauge winding D No brushes and commutation 14 What is the advantage of AC drive compared

to DC drive? A Requires less space B Installation and running cost is less C Fast response and wide speed range of

control D Power circuit and control circuits are simple 15 Which is the application of single quadrant

loads operating in first quadrant in drives? A Hoists B Elevators C Conveyors D Centrifugal pumps


16 What is the function of Field Supply Unit (FSU) in DC drive?

A Produces required firing current to the firing circuit

B Provides variable voltage to the field winding of motor

C Provides a constant voltage to the field winding of motor

D Provides a constant voltage to the armature of the motor

17 What is the disadvantage of DC drive? A Not suitable for high speed operation B More complex with a single power

conversion C More expensive than AC drive for high

capacity motor D Installation of DC drives is more complicated 18 What is the purpose LCD in Basic Operator

Panel (BOP) in AC drive? A Indicate the status of drive B Monitor the parameter of AC drive C Indicate the display error in reading D Indicate the incorrect operation of BOP 19 Which is the correct sequence operation of

key button in BOP of AC drive to change the direction of rotation?

A Press ON →REV → ON B Press OFF → REV → ON C Press ON → OFF → REV → ON D Press ON →REV → OFF → ON 20 What is the purpose of PROG / DATA button

in BOP of AC drive? A To change the parameter setting B To store the entered data and factory stored data C To display the data direction of rotation

forward / REV D To display the data status of frequency and

current 21 Which is proportional to the torque in D.C

motor? A Back E.M.F B Field current C Terminal voltage D Armature current

22 What is IGBT in VF drive? A Inverter switching device B D.C bus switching device C Rectifier switching device D Field supply switching device 23 What is the function of VSI drives? A Converts A.C to D.C B Converts A.C to A.C C Converts D.C to A.C D Converts D.C to D.C 24 Why the A.C drives are mostly used in

process plant? A Easy to operate B Robust in construction C Very high starting torque D Maintenance free long life 25 What is the advantage of on-line UPS over

offline UPS A Supplies constant power output B It gives constant output frequency C Works on single phase or three phase supply D Free from change over and transition

problems 26 Which electronic circuit is used in a

automatic voltage stabilizer to produce constant output voltage?

A Rectifier circuit B Amplifier circuit C Oscillator circuit D Feedback circuit 27 Which feedback network is used for

automatic voltage stabilizers? A Current divider network B Voltage divider network C Tapped transformer network D Resistance temperature detector network 28 Which electrical device is actuating the

voltages in a stepped voltage stabilizer? A Autostat B Output transformer C Over voltage relay D Under voltage relay 29 What is the effect in internal resistance of a

discharged cell? A Increase B Decrease C Becomes zero D Remain same


30 Calculate the voltage and ampere/hour, if four cells rated as1.5 v and 8 A.H are in parallel?

A 6 v and 24 AH B 3 v and 16 AH C 4.5 v and 8 AH D 1.5 v and 32 AH 31 Which is the application of automatic

stepped voltage stabilizer? A Geyser B Grinder C TV Receiver D Air conditioner 32 Which is the function of an inverter? A Converts A.C voltage into D.C voltage B Converts D.C voltage into A.C voltage C Converts D.C voltage into higher D.C voltage D Converts A.C voltage into higher A.C voltage 33 What is the purpose of output transformer in

inverters? A Step up input AC B Step down input AC C Step up AC from amplifier D Step down AC from amplifier 34 Which type of output transformer is used in

automatic voltage stabilizer? A Auto transformer B Static transformer C Ring core type transformer D Ferrite core type transformer 35 Which principle the constant voltage

transformer works? A Self induction principle B Fall in potential principle C Ferro-resonant principle D Mutual induction principle 36 Which transformer is used in servo voltage

stabilizer? A Step up transformer B Step down transformer C Torodial autotransformer D Constant voltage transformer

37 What is the type of A.C voltage stabilizer?

A Servo voltage stabilizer B Automatic voltage stabilizer C Manual stepped voltage stabilizer D Constant voltage transformer stabilizer 38 Which instrument is used to check short

circuit faults in electronic circuit in voltage stabilizer?

A Ammeter B Voltmeter C Ohmmeter D Multimeter 39 What are the important stages in a simple

inverter? A Oscillator and rectifier stages B Oscillator and amplifier stages C Amplifier and transformer output stages D Oscillator, amplifier and transformer output

stages 40 Where square wave inverters are used? A Computers B TV receiver C DVD players D General lighting 41 What is the function of inverter in A.C drive? A Converts A.C to D.C voltage B Stabilize the constant voltage C Varies the frequency to control the speed D Converts D.C voltage back to A.C voltage 42 Why as per the name plate detail, the

voltage/frequency ratio of the motor must be maintained in A.C drive?

A To reduce the voltage drop B To obtain maximum efficiency C To maintain constant frequency D To maintain constant power factor 43 What is the main functions of A.C drive? A Maintains constant frequency B Changes the voltage as required C Improves the power factor in industry D Maintains constant speed


44 Which region A.C drive is operated above its rated frequency?

A Constant time region B Constant volt/frequency region C Constant horse power region D Constant voltage/current region 45 How the magnetic saturation can be avoided

in AC drive? A By reducing the magnetic force B By keeping the flux density constant C By keeping the magnetic flux constant D By varying the number of turns of the coil 46 What is the disadvantage of A.C drive? A Maintenance cost is very high B It produces a simulated wave form C Operation is complicated, not easier D Not suitable for high speed operation 47 What is the use of D.C bus in A.C drive? A It converts D.C into A.C B It delivers the power to the motor C The power from rectifier is stored on it D It simulate the sine wave at particular

frequency 48 What is the use of P.W.M to the A.C motor in

A.C drive? A To convert A.C pulse into D.C B It deliveries the stored power to AC drive C It smoothness the incoming power supply D To simulate a current sine wave to the

desired frequency 49 Which precaution to be taken while

connecting circuit breaker to main supply? A Separate wiring from main wiring B Share the full load of main wiring C Can share 10% over load of KVA rating only D Can share 10% less load of KVA rating only

50 How supply is fed to the load by OFF-line UPS, if power supply is available?

A Inverter directly supply power B Main supply directly supply power C Main supply through filter & will supply power D Battery and inverter will supply power

regulator 51 How supply is fed to the load by ON-line

UPS, when power supply is available?

A Inverter directly supply load B Main supply directly supply load C Main supply through inverter to load D Battery supply through inverter to load 52 Which are the important stages in a simple

inverter? A Oscillator and rectifier stage B Oscillator and amplifier stage C Amplifier and transformer output stage D Oscillator, amplifier and transformer output

stage 53 Why the A.C drives are mostly used in

process plants? A Easy to operate B Robust in construction C Very high starting torque D Ruggedness and maintenance free long life 54 What is the purpose of LED indicators in

BOP panel of DC drive? A To indicate the status of drive B To indicate system running C To indicate fault occurred D To indicate availability of power


55 Why the shielded cable is recommended for the tachometer?

A To measure correct speed B To avoid break of cable C To eliminate electrical interference D To reduce the device error 56 What does the green LED indicate in BOP of

DC drive? A Warns before fault occur B System running C Status of drive D Power supply is 'ON'


Questions: Level 3 1 How the base speed of D.C shunt motor can

be increased by using D.C drive? A By reducing the field current B By increasing the field current C By increasing the supply voltage D By reducing the armature voltage 2 How the constant torque can be obtained

from armature and field controlled drives? A By reducing the field current B By increasing the field current C By reducing the armature current D By controlling the armature voltage 3 How the backup time of UPS can be

increased? A Increase the VA rating of UPS B Increase the AH capacity of battery C Decrease the AH capacity of battery D Maintain battery terminal voltage always

90% of rating 4 How the hard sulphation defect in

secondary cell can be prevented? A Provide trickle charging B Provide freshening charge C Provide constant current charging D Provide constant potential method charging 5 Which part in UPS supplies continuous

output voltage in case of input voltage failure?

A Battery unit B Inverter unit C Rectifier unit D Controller unit 6 What is the effect during loading of the cell,

the current strength falls and become zero? A Buckling B Polarization C Local action D Polarity short 7 What is the reason for having low back up

time in UPS? A Fault in inverter circuit B Battery is short circuited C Mains earthing is not proper D Ampere hour (A.H) capacity of battery is not

sufficient

8 Which is the cause for the fault if the output voltage of UPS is higher than normal?

A Battery get short circuited B Defective feedback circuit C Input voltage is very high D Relay points are joined together 9 What is the reason for tripping the UPS with

full load? A Main supply failure B Incorrect overload settings C Battery charger input fuse blown out D Loose connection in battery terminal 10 How the A.C drives control the speed of A.C

motor? A By providing double cage rotor B By changing the number of poles C By varying output voltage and frequency D By interchanging the connection terminals in

motor 11 Which refers, if the A.C motor operates at

less than rated V/Hz ratio and above rated name plate speed?

A Field effect B Field operation C Field weakening D Field strengthening 12 How, the rated torque at all speeds can be

maintained in A.C motor? A By keeping the voltage constant B By keeping the load constant C By keeping the current-to-frequency ratio

constant D By keeping the voltage-to-frequency (V/F)

ratio constant 13 Why the A.C drives are better suited for high

speed operation? A Not having brushes B Robust in construction C High starting torque D Having lighter gauge winding 14 Why UPS works on 240v - AC mains only

and rotor on battery ? A Battery fuse is blown out B Inverter fuse is blown out C Input AC mains is very low D Charger input fuse blown out



15 What is the reason, if the UPS is switched ON without load but DC under voltage indicator turns ON ?

A Short circuit B Load too high C Inverter fuse is blown D Overload setting in wrong 16 Which is the reason that UPS does not

switch ON in battery mode? A Check oscillator circuit B Problem in inverter circuit C Main filter capacitor problem D Over control cord is not functioning properly 17 Which is the reason for the charger does not

turn ON when UPS in switched ON? A Inverter fuse is blown out B Mains input fuse blown out C Mains earthing is not proper D Main filter capacitor problem 18 What precautions to be observed while

removing components from PCB of voltage stabilizer?

A Ascertain absence of D.C. voltage B Ascertain the transistor are not shorted C First ascertain from the possible test with in

the circuit D Position of terminal connections and hook

up connection to be noted 19 What is the cause, if the relays in stabilizer

will show higher output voltage than input voltage with boost indication?

A When both transists are short B When both transistors are open C Presence of D.C supply makes relays in

operative D Presence of control voltage makes relays in

operative 20 When the relay will show lower output

voltage than input voltage buck indicator? A When transistors are open B When transistors are short C Presence of D.C supply makes relays in

operative D Presence of constant voltage makes relays

in operative

Module - 5 : Rectifiers - Invertors AC/DC Drives - Key paper


SL.No Key SL.No Key SL.No Key SL.No Key 1 B 1 B 34 A 1 A2 D 2 D 35 C 2 D3 A 3 A 36 C 3 B4 B 4 B 37 C 4 A5 C 5 A 38 D 5 A6 B 6 A 39 D 6 B7 B 7 C 40 D 7 D8 D 8 C 41 D 8 B9 D 9 D 42 D 9 B10 C 10 D 43 B 10 C11 B 11 C 44 B 11 B12 D 12 B 45 B 12 C13 B 13 D 46 A 13 D14 A 14 B 47 A 14 A15 A 15 D 48 B 15 C16 D 16 C 49 A 16 B17 B 17 A 50 B 17 A18 B 18 B 51 B 18 A19 A 19 C 52 D 19 A20 A 20 B 53 B 20 B21 C 21 D 54 A

22 A 55 C 23 B 56 B 24 D 25 D 26 D 27 B 28 A 29 A 30 D 31 C 32 B 33 C


Electrician - Semester II - CITS - Module 6: Industrial Wiring - Control Panel Questions: Level 1 1 Which supply indicates by the colour of

conductor exhibited on Red, Blue, Black? A Supply DC 3 wire system B Single phase AC system C Supply AC system 3 phase D Apparatus AC system 3 phase 2 Which cable ties are used to bunch the

wires? A Silk ties B P.V.C ties C Nylon ties D Cotton ties 3 Which device is avoided in the panel board

assembly? A Sensors B Indicating lamp C Isolating switch D Push button switch 4 What is the name of the device marked ‘X’?

A Stop button B Start button C Main contact D Auxiliary contact 5 What is the name of the wiring accessory

used in control panel wiring?

A DIN rails B G channel C Grommets D Race ways

6 What is the name of the device marked ‘X’ in the circuit?

A Contactor B No volt coil C Stop button D Overload relay trip 7 What is the name of the accessory used in

control panel wiring?

A Wire ferrules B Wire sleeves C Nylon cable ties D Cable binding strap 8 What is the name of the accessory used in

control panel wiring?

A Lugs B Thimble C Crommet D Terminal connector


9 What is the name of the contact marked as ‘X’?

X

A Star contact B Delta contact C Auxiliary contact D Overload relay contact 10 What is the name of device, that operates

electrically controlled double break switch? A Contactor B Limit switch C Isolating switch D Relay 11 What is the name of the accessory that is

made by chromated metal? A Race ways B DIN Rail C Lugs D Contactors


Questions: Level 2 1 What is the function of isolator switch? A Trips automatically at overload B Protect the circuit from short circuit C Operated by the motion of an object D Manually operated switch to disconnect the

circuit 2 Which trips the circuit, as it is over loaded? A MCB B ELCB C Isolator D Contactors 3 Which device protects from overload and

short circuit in a panel board? A Isolating switch B Time delay relay C Thermal overload relay D Miniature circuit breaker 4 Which switch with an actuator is operated by

the motion of a machine or part of an object? A Limit switch B Toggle switch C Isolating switch D Push button switch 5 Which switch is operated at OFF load

condition? A Limit switch B Isolating switch C Two way switch D Push button switch 6 What is the reason for providing two

separate Earthing in panel board? A Panel board is made in metal box B Control the stray field in the panel C Reduce the voltage drop in panel board D Ensure one earthing in case of other failure 7 Which circuit, the limit switches are used? A Lift circuits B Street lighting C Motor control circuits D Domestic power circuits 8 How the control circuit voltage and power in

a contactor are to be selected? A As per rated current B As per supply voltage C As per no volt coil rating D As per the type of supply

9 What is the criteria to select the contactor? A Type of supply B Type of load connected C Supply voltage and load D Place of use the contactor 10 Which accessory is used to mount MCB,OLR

in the panel board without using screws? A DIN Rail B G. channel C Grommets D PVC channel 11 Which type of device protects motors from

over heating and over loading in a panel board?

A Rectifier B Limit switch C Thermal relay D Electro mechanical relay 12 What is the use of ‘G’ channels in control

panel? A For fixing relays B For fixing contactors C For fixing instruments D For fixing terminal connectors 13 Which is the standard duty cycle code of the

contactor for starting and stopping the AC resistive and inductive load?

A AC1 B AC2 C AC3 D AC4 14 Which is the correct sequence operation of

contactors for operating automatic star delta starter?

A Main→Star→Delta →Timer B Star→ Main→Timer→Delta C Main→Timer→Delta→Star D Star→Timer→ Main→Delta 15 Why control panels are provided with control

transformer? A To maintain rated voltage to load B To operate the auxiliary circuits C To maintain rated main supply voltage D To supply reduced voltage to power circuit


16 What is the use of PVC channel in a control panel wiring?

A Mounting MCB B Mounting relays C Path way for electrical wiring and protection D Mounting double deck terminal contactor 17 What is the purpose of thermal over load

relay in control panel? A Switching ON/OFF the circuit B Protect the circuit from earth fault C Control the circuit based on time delay D Protect the motor from over heating and loading 18 Why sequential control of motors is required

in an industrial application? A To share more loads B To reduce power consumption C To minimise the operating cost D To increase the accuracy of operation 19 Which material is used to make open frame

bimetallic adjustable thermostat contacts? A Silver B Brass C Copper D Bronze 20 What is the purpose of DIN-rail used in

control panel wiring? A It provides a path way for electrical wiring B Install the high powered circuit accessories C Mounting the double deck terminal

connectors D Mounting the control accessories without

screws 21 Which device controls the operations in

sequential control systems? A Timer B Relays C Contactor D Control transformer 22 Which DC load is represented by the DC4

standard duty cycle of contactors? A Resistive loads except motor loads B Starting and stopping of shunt motor C Starting and stopping of series motor D Starting and stopping with in charge and

braking

23 Which type of contactors are used for starting of shunt motors?

A DC1 B DC2 C DC3 D DC4 24 How many self holding normally open

contacts are provided for two motor sequential control?

A 1 B 2 C 3 D 4 25 What is the use of nylon cable ties? A To connect the terminal B To hold (or) bunch the cables C To identify the polarity of cables D To increase mechanical strength 26 Which standard AC duty cycle contactor is

used for heaters and furnaces? A AC1 B AC2 C AC3 D AC4


Questions: Level 3 1 How the contacts in a contactor can be

engaged for working? A By manual operation B By mechanical settings C By operating electromagnet to change the

position D By using bimetallic strip to change the

position 2 Which prevents flare out of stripped and

stranded cables in the panel board? A Sleeves B Wire ferrules C Lugs and thimbles D Cable binding straps and button 3 How to protect the cable from insects and

rats into the panel? A By using sleeve B By using crommets C By using cable binding straps D By providing nylon cable ties 4 What essential feature to be considered

while designing a layout of control panel? A Proper type of protection and measuring

system B Inside area and number of indicating lights in

front panel C Suitable method of labeling and cable

harnessing D Outside dimensions and swing area of

cabinet door 5 Why power and control wirings run in

separate race ways? A To reduce heat B To reduce the radio interference C To increase the insulation resistance D To increase the current carrying capacity 6 Why the motor is not changing the direction,

if reverse push button is pressed in forward and reverse control star delta starter?

A No volt coil is not energized B Fault in forward contactor C Due to interlock in reverse contactor D No voltage exist in reverse contactor

7 What happen, if time delay relay of a auto star delta starter not open during starting?

A Does not start B Runs normally C Runs in star only D Start and stops 8 What is the effect of connecting cables in

control panel without grommets? A Reduces voltage drop B Protect the cable from break C Increase the insulation resistance D Increase the current carrying capacity 9 What is the reason, if DOL starter wired

motor stops immediately after switching ON? A High speed B Low overload current setting C Supply frequency incorrect D Over lubrication 10 What is the reason for the contactor coil is

failed with overheating? A Over load in motor B Over voltage C Open contactor coil D Higher voltage rate coil 11 What will happen if 'ON " contact is damaged

and permanent open?

A Motor will not run B Over current in control circuit C Remote control will not work D Remote control only will work 12 What will happen if 'K1" contactor coil is used

on 500V instead of 240V?

A Work normally B Circuit will damage C Will not work D will chatter the contacts



13 Why the forward reverse control circuit fails to change direction of rotation. What is the reason?

A Brake provided in one direction B Phase sequence is same C Phase sequence is not same D Low voltage in one phase 14 What will happen if AC1 contractor is used for

jogging of crane motor? A Works normally B Contactor damages instantly C Contactor coil heats up D Contact faces damage 15 What happens, if time delay relay of a auto

star delta starter still in closed condition after starting?

A Starts and stop B Runs normally C Runs in star only D Runs in delta only 16 What happens in the control circuit of a 12V

DC contactor if a 12V AC contactor coil is replaced ?

A The contactor does not function because of less current through the coil

B The contactor will be damaged because of excessive heating up of coil

C The contactor does function normally without abnormal effects

D The contactor does function but will produce more noise

Module 6 : Industrial Wiring - Control Panel - Key paper

Questions: Level 1

Questions: Level 2 Question: Level 3

SL.No Key SL.No Key SL.No Key 1 A 1 D 1 C 2 C 2 C 2 C 3 A 3 D 3 B 4 D 4 A 4 D 5 A 5 B 5 B 6 D 6 D 6 C 7 D 7 A 7 C 8 C 8 C 8 C 9 C 9 C 9 B 10 A 10 A 10 B 11 B 11 C 11 D 12 D 12 C 13 B 13 B 14 B 14 D 15 B 15 D 16 C 16 B 17 D 18 D 19 A 20 D 21 A 22 C 23 B 24 B 25 B 26 A


Electrician CITS - Semester- II Module 7: Domestic Appliances

Questions: Level 1 1 What is the name of the part of electric iron?

A Sole plate B Pressure plate C Mica insulation D Asbestos sheet 2 Which formula is used to calculate the heat

generated as per Joules law? A Heat generated = IRT / J cal B Heat generated = I2RT / J cal C Heat generated = IR2T / J cal D Heat generated = (IR)2 T / J cal 3 What is the magnetron tube filament voltage

used in microwave oven? A 1.5 V A.C B 2.0 V A.C C 3.0 V A.C D 3.2 V A.C 4 What is the name of the circuit?

A Electronic fan regulator B Electronic voltage multiplier C Electronic voltage stabilizer D Electronic triggering circuit of SCR 5 What is the value of insulation resistance of

an electrical appliance? A Should be less than one Ohm B Should be one Ohm C Should not be less than one to 10 megohm D Must be more than 10 megohm

6 Which appliance-works by heating effect of electric current ?

A Food mixer B Kettle C Table fan D Ceiling fan 7 Which part of the electric iron is pressed

over the clothes to be ironed? A Sole plate B Pressure plate C Heel plate D Heating element 8 Which part is used to regulate the

temperature of automatic electric iron? A Sole plate B Pressure plate C Power cord D Thermostat 9 Which part is used to connect the supply to

the electric iron? A Handle B Sleeve C Power cord D Pressure plate 10 Which part is marked as ‘X’ in the typical

outline of a steam iron?

A Sole plate B Pressure plate C Thermostat D Water tank 11 Which electrical appliance is used to heat up

the air space in a room? A Kettle B Toaster C Room heater D Hair drier


12 How many types of room heaters are there according to the method of air circulation?

A 2 B 4 C 5 D 6 13 What is the normal working temperature

range of heating element of a toaster? A 285°C to 900°C B 385°C to 900°C C 385°C to 800°C D 285°C to 800°C 14 Which part is marked as ‘X’ in the schematic

diagram of a toaster?

A Thermostatic switch with timer B Centre heating element C Two side heating element D Mechanical lever 15 Which is the rotating part of a ceiling fan? A Stator winding B Suspension rod C Canopy D Rotor 16 How is the capacity of a ceiling fan is

expressed? A By this blade length B By sweep and voltage C By the voltage range D By speed in r.p.m 17 What is the minimum clearance between

floor and blade of the ceiling fan? A 2.4 meters B 2.75 meters C 3 meters D 3.5 meters

18 Which part is marked as ‘X’?

A Front cover B Blade shank C Speed regulator D Oscillating knob 19 What is the expansion of HDP? A High Density Polythylene B Hard Density Polythylene C Heavy Density Polythylene D High Density Polymer 20 Which electrical effect is used in electric

bell ? A Heating effect B Electromagnetic effect C Lighting effect D Chemical effect 21 Which is an audio signalling device? A Spring bell B Interupter bell C Buzzer D Single stroke 22 What is the S.I unit of heat ? A Calorie B Joule C Centigrade D Fahrenheit


Questions: Level 2 1 Which material is used to make heating

element? A Silver B Copper C Nichrome D Aluminium 2 What is the function of stirrer motor in micro

wave oven? A Draws cooling air inside B Spreads the heat uniformly C Exhausts the hot air outside D Revolves and reflects the electromagnetic

energy 3 What is the purpose of U bend marked as

‘X’ in geyser?

A Prevents draining of water B Avoids the forming of scales C Reduces the pressure of outlet pipe D Restricts the air locking inside the tank 4 Which position of the heater range switch

will give maximum output?

A Position 1 B Position 2 C Position 3 D Position 4 5 Calculate the heat generated in a electric

heater of 1000 watt, 240 volt, worked for 5 minutes?

A 70.5 Kilo calories B 71.0 Kilo calories C 71.6 Kilo calories D 72.1 Kilo calories

6 What is the purpose of protection grooves at various places in a heater base plate?

A Radiate the heat properly B Retain the heating element firmly C Place the vessels firmly on heater plate D Protect the heating element from damage 7 What is the purpose of sole plate in electric

kettle? A Acts as a balancing weight B Acts as an insulator for element C Protect the kettle base from damage D Keep the element in close contact with

container 8 What is the function of neutral path in AC

supply system for appliances? A Provides current return path B Provides voltage level constant C Reduces voltage drop in wiring D Maintains load current constant 9 What is the function of magnetron tube in a

microwave oven? A Amplifies the microwave signal B Changes the polarity every half cycle C Oscillate and produce cooking frequency D Converts microwave energy to electrical

energy 10 Which type of motor is used in the wet

grinder? A Universal motor B Repulsion motor C Capacitor start induction run motor D Capacitor start capacitor run motor 11 How is the resistance of the heating element

is calculated?

A By using the formula sIAR =

B By using the formula AsIR =

C By using the formula 2V

WR =

D By using the formula W

2VR =

12 Which factor the heat produced in a heating element depends upon?

A Position of the element B Current flow and resistance C Atmospheric condition D Earthing system


13 What is the advantage of automatic electric iron?

A Cost is less B Can regulate the temperature C Can be used at any voltage D Gives protection from over voltage 14 What is the function of themostat? A To control the voltage B To adjust the resistance of heating element C To close or open a circuit predetermined

temperature D To protect against earth leakage circuit 15 Where is the heating element placed in

electric irons? A On the sole plate B On the pressure plate C Over the heel plate D Over the top cover 16 What is the purpose of the part mechanical

timer in an automatic toaster? A To control the carriage handle B To adjust the toaster time C To adjust the current D To control supply voltage 17 Which types of motors are used on smaller

size of hair dryers? A Reputation motor B Permanent capacitor C Shaded pole motors D Capacitor start - induction run motor 18 Which type of motor is used on larger type

hair dryer? A Reputation motor B Universal motor C Permanent capacitor motor D Reluctance motor 19 Which effect of electricity is used in electric

toaster? A Heating effect B Chemical effect C Magnetic effect D Lighting effect 20 Which type of room heater is known as

radiant heaters? A Bowl type room heater B Forced draft type room heater C Oscillating type room heater D Rod type room heater

21 Which type of room heater has a provision to blow the air by electric fan through electrically heated elements?

A Natural draft type room heater B Forced draft type room heater C Bowl type room heater D Rod type room heater 22 How the capacitor is connected in a ceiling

fan? A In series with the main winding B In series with the auxiliary winding C In parallel with main winding D In parallel with auxiliary winding 23 How is the sweep of ceiling fan is

determined? A Diameter of the circle to be formed by one

rotation B Distance from the centre of the fan to tip of

blade C Distance of the length of the blade D Distance of the width of the blade 24 How the speed is varied in a ceiling fan? A By connecting a regulator in parallel B By connecting a regulator in series C By increasing the turns of windings D By decreasing the turns of windings 25 Which type of capacitor is used in ceiling

fan? A Air capacitor B Paper capacitor C Ceramic capacitor D Electrolytic non polarised type 26 What is the function of cotter pin at both

ends of down rod in a ceiling fan? A To prevent falling of this fan by slackening

of bolt nut B To support the top conopy fittings C To avoid tight movement of this fan D To avoid loose alignment of blade 27 What is the result of over loading a food

mixer? A Smoke coming from coupling B Mixer runs a one speed only C Mixer runs but becomes hot D Mixer runs noisy


28 Which type of food mixer is used with two core with two pin type cord wire?

A 3 speed mixer B Single insulated mixer C Double insulated mixer D 2 speed mixer 29 Which schematic diagram is illustrated?

A Wet grinder circuit B Food mixer circuit C Washing machine circuit D Hair drier circuit

29 How the motor of a mixer is operated with different speeds?

A By tapping from different points of field coil windings

B By connecting an additional variable resistance

C By connecting the motor in series with load D By regulating the supply voltage 30 How the speed is regulated in a table fan? A By using a series resistor B By tapping the field winding C By using a capacitor D By field divertor 31 Where the stator windings are placed in a

table fan? A On crank disc shaft B In slots of the laminated iron core C In the oscillating unit D In the vertical spindle 32 What should be the minimum value of

insulation resistance of a table fan? A Should be one Ohm B Should not be less than one Ohm C Should be three megohm D Should not be less than one megohm 34 Where is the blades are attached in a table

fan? A To the front cover B To the rotor shaft C To the stator D To cross gear

35 Which part is marked as ‘X’ in schematic diagram of table fan?

A Regulator B Running winding C Starting winding D Connecting cord 36 Which type of resistors are used in auto fire

alarm circuit? A LDR B Varistors C Sensistors D Thermistors 37 Which type of wiring is to be done in fire

alarm system? A PVC conduit B Metal conduit C PVC casing & capping D CTS wiring (Repair wiring) 38 How the immersion heater tube ends are

sealed? A By china clay B By insulating wax C By pre adhesive D By thermal and water proof compound 39 Why water level indicator is provided in a

immersion heater? A To get appropriate heat B To reduce the heat of the tube C To increase the heat efficiency D To protect water from entering terminal 40 How microwave converted as heat inside

microwave oven? A By high speed oscillation microwave B By changing the polarity at low speed C By low speed oscillation of microwave D By changing the frequency at high speed 41 What is the frequency of microwave in

microwave oven? A 2000 MHz B 2250 MHz C 2350 MHz D 2450 MHz


42 What is the value of output DC voltage that converted by voltage doubler circuit in microwave oven?

A 2800 v B 3200 v C 3800 v D 3900 v 43 Which part of microwave oven helps uniform

heating of foods? A Cook relay B Stirrer motor C Blower motor D Dual latch switch 44 Which material is used as heat insulators in

geyser? A PVC B Fiber C Asbestos D Glass wool 45 Which type of AC single phase motor is

used in washing machine? A Capacitor start induction run motor B Repulsion motor C Reluctance motor D Shaded pole motor 46 Which type of washing machine is fitted with

concave shaped disc? A Air wash B Agitator wash C Pulsator wash D Chaos punch wash 47 Which type of wash technique is used for

wash delicate fabrics? A Agitator wash B Pulsator wash C Air power wash D Chaos punch wash 48 Which washing machine water is propelled

up wards? A Agitator wash B Pulsator wash C Air power wash D Chaos punch wash

49 Calculate the HP of the water pump motor, if has to deliver 1000 litre to a height of 30 metre within 15 minutes.

A 0.5 HP B 0.44 HP C 0.48 HP D 0.39 HP 50 Which pump is also called as piston pump? A Jet pump B Centrifugal pump C Submersible pump D Reciprocating pump 51 Which type of A.C. single phase motor is

used for jet pumps? A Universal motor B Split phase motor C Permanent capacitor motor D Capacitor start induction motor 52 What is the purpose of heel plate in non -

automatic electric iron ? A To keep the heating element firmly B To supply a resting point C To transfer the heat from heating element D To increase the weight of iron 53 Which type of motor is used in food mixer? A Shunt motor B Compound motor C Universal motor D 3 phase motor 54 Which type of motor is used in ceiling fan? A Repulsion motor B Reluctance motor C Universal motor D Permanent capacitor motor 55 What is the condition to change the brushes

of a food mixer? A If found short by 2/3rd of its original length B If found sparking on this brushes C If the mixer is vibrating at low speed D If the speed of mixer is very high 56 Which type of motor is used on table fan? A Reputation motor B Universal motor C Capacitor start- capacitor run motor D Permanent capacitor motor


Questions : Level 3 1 What is the fault in a food mixer if it runs

intermittently? A Worn out brushes B Armature coil open C Defective commutator D Field winding partially short 2 What is the defect in a single phase pump

motor if it runs with slow speed? A Defective capacitor B Open starting winding C Short in starting winding D Short in running winding 3 What is the effect of the loose connection of

pressure plate in an electric kettle? A The heating element will be damaged B Temperature will be more C Current will be increased D Resistance will be increased 4 Why the heating element of a kettle is

placed and enclosed between two circular mica pieces?

A To distribute the heat uniformly B To avoid contact with any metallic part C To reduce the resistance D To reduce the voltage drop 5 What is the reason for not giving heat by

hair dryer while the fan is working? A Thermostat is closed B Short in power cord C Open in heater circuit D Power is not available 6 What is the reason for the heater of hair

dryer operateswhile the blower fan is not working?

A The fan winding open circuited B Improper mounting C Heater open circuited D Loose parts of the blower 7 What is the reason for connecting a

capacitor in ceiling fan circuit? A For good starting torque B For controlling the speed C For power factor improvement D For increasing the sweep area

8 What is the reason for a food mixer runs at one speed only?

A Over loading of mixer B The field winding is partially burnt C Worn out brushes D Improper coulping 9 What is the reason for running ceiling fan

hot? A Misalignment of blades B Slack capacitor housing C Loose connection in terminals D Partial short circuit in the winding 10 Which type of bearing is used in table fan

motor? A Ball bearing B Jewel bearing C Fluid bearing D Magnetic bearing 11 What is the reason for a table fan runs hot? A Blades are out of balance B Due to shorted winding C Misalignment of blades D Loose guards 12 What is the reason of humming noise in a

table fan? A Defect in control switch B Worn out bearing fit C Shorted winding D Blades are unbalanced 13 What will happen, if immersion heater is

switched ON without water? A Fuse blown out B Metal tube burst C Heated up normally D Element will not heat 14 What is the output of heat in a twin unit type

hot plate, if the heating elements are connected like this?

A OFF B Low C High D Medium



15 What will happen, if blower motor failure in microwave oven?

A Over heat in power tranformer B Voltage doubler circuit damaged C No producting of electro magnetic waves D Magnetron assembly damaged due to over

heat 16 What is the defect in microwave oven, if

oven shuts down before end of cook cycle? A Open cook switch B Open thermo cut out C Open in power transformer D Open cook relay contacts 17 What is the defect, if microwave oven does

not go into cook cycle when cook switch is activated?

A Defective magnetron tube B Defective front latch switch C Defective power transformer D Defective voltage doubler circuit 18 What is defect, if a food mixer does not run? A Worn out brushes B Improper coupling C Loose mounting screws D Poor insulation resistance

19 What is the defect, if mixer makes more noise?

A Loose brushes B Worn out carlom brushes C Uneven commutator surface D Partially burnt out field winding 20 What is the defect, if a washing machine

switch OFF frequency? A Low incoming supply B Incorrect setting of timer C Defective starting winding D Defect in running winding of motor 21 What is defect, if a washing machine gives

shock? A Weak capacitor B Incorrect centrifugal switch C Low insulation resistance value of motor D High impedence value of starting winding

Module 7: Domestic Appliances - Key paper


SL.No Key SL.No Key SL.No Key SL.No Key

1 A 1 C 39 C 1 A2 B 2 D 40 D 2 A3 D 3 A 41 D 3 A4 A 4 B 42 C 4 B5 C 5 C 43 C 5 C6 B 6 B 44 C 6 A7 A 7 D 45 A 7 A8 D 8 A 46 C 8 B9 C 9 C 47 C 9 D10 D 10 C 48 B 10 A11 C 11 D 49 B 11 B12 A 12 B 50 B 12 B13 B 13 B 51 D 13 D14 A 14 C 52 B 14 C15 D 15 A 53 C 15 D16 B 16 B 54 D 16 C17 B 17 C 55 A 17 C18 D 18 B 56 D 18 A19 A 19 A 19 C20 B 20 D 20 D21 C 21 B 21 C22 B 22 B 23 A 24 B 25 D 26 A 27 C 28 C 29 B 30 A 31 A 32 B 33 D 34 B 35 C 36 B 37 C 38 D


Electrician - Semester II - CITS - Module - 8 : Estimation and Costing

Questions: Level 1 1 What is the reconmended height for

swithches from the floor level as per NECode?

A 2.5m B 2.25m C 2.0m D 1.3m 2 Which is mainly required to determine the

dimension of building for preparing wiring estimation?

A Types of building B Drawing layout C Specification of materials D Schedule of rate 3 What is the recommended size of conduit

pipe used for 3 core copper cable? A 19mm heavy gauge conduit B 25mm heavy gauge conduit C 10mm heavy gauge conduit D 15mm heavy gauge conduit 4 Which type of wiring is suitable for computer

room? A Battern wiring B P.V.C casing and capping C P.V.C conduit wiring D Metal conduit Wiring 5 What is the recommended height for the

horizontal run of cables from floor level as per NEC code?

A 3.0m B 2.5m C 2.0m D 1.5m 6 Which place the rawl plug tool is used? A Non-rigid walls B Rigid walls C Wooden board D Metal board

7 What is the formula to calculate the diversity factor?

A Diversity factor = loadactualMinimum

loadonInstallati

B Diversity factor = loadonInstallati

loadactualMinimum

C Diversity factor = loadMinimumloadMaximum

D Diversity factor = loadMaximumloadMinimum

8 What is the permissible load for the light and fan sub-circuits?

A 600 Watt B 800 Watt C 1000 Watt D 1250 Watt 9 What is the maximum number of point are

allowed in a light and fan sub-circuits? A 8 B 9 C 10 D 12 10 How many number of socket outlet points

are to be provided in a light and fan sub circuit?

A 2 B 3 C 4 D 5 11 What is the recommended rating of a ceiling fan

for estimating the connected load? A 40 Watt B 60 Watt C 75 Watt D 100 Watt 12 What is the recommended rating of a

incandescent lamp for estimating the connected loads?

A 40 Watt B 60 Watt C 75 Watt D 100 Watt


13 What is the recommended rating of a 6A 3 pin socket outlet for estimating connected loads?

A 60 Watt B 75 Watt C 100 Watt D 125 Watt 14 What is the recommended rating of a 16 A

power socket outlet for estimatiing connected rods?

A 800 Watt B 1000 Watt C 2000 Watt D 3000 Watt 15 What is the length of the conduits available

commercially? A 3 meters B 4 meters C 5 meters D 6 meters 16 What is the minimum size of non-metallic

conduit pipes used in wiring? A 12 mm B 16 mm C 20 mm D 24 mm


Questions: Level 2 1 What are the number of 16 A power socket

are recommended for the dwelling area of 45m2?

A 1 B 2 C 3 D 4 2 What are the numbers of light and fan points are

recommended for the divelling area of 55m2? A 4 light and 2 fan points B 3 light and 2 fan points C 3 light and 3 fan points D 4 light and 3 fan points 3 What is the full load current of 5 HP,400V 3

phase induction motor having the efficiency 80% and power factor of 0.85?

A 5.2 Amps B 6.9 Amps C 7.8 Amps D 9.5 Amps 4 When the wiring diagram to be drawn while

preparing wiring estimation? A Before taking measurement B After finalising the layout C Before finalising the layout D After selecting the size of wire 5 Which point is to be considered while

planning for load in wiring installation? A Number of labour's required B Provision for the anticipated increase in

loads C Selections of brand of materials D Type of dwelling area 6 Calculate the labour cost for the below

mentioned wiring work, if the labour cost per point is Rupees 100/- (i) Meter board - 2 points (ii) Distribution board - 2 points (iii) light and fan - 17 points (iv) power - 2 points?

A Rs 2300 B Rs 2500 C Rs 2700 D Rs 3000

7 What is the purpose of layout diagram in estimation of conduit wiring?

A To calculate the length of conduit and wires B To select number of Accessories C To calculate the connected load D To select the type of wire 8 What is the recommented cable size for 5

HP motor by considening full load current and starting current?

A 2.0 mm2 copper conductor B 4.00mm2 copper conductor C 2.0mm2 aluminium conductor D 1.0mm2 copper conductor 9 When the work of concealed wiring

installation should begin in new building? A Before finishing the plastering work B After finishing the main structural civil work C Before finishing the white wash and painting

work D After completion of civil shuttering work 10 Which step to be considered first before

preparing wiring estimation for house? A Prepare the wiring layout B Collect the data from consumer like light,

fan and power point required C Collect the required wiring accessories and

materials D Collect the supply service from electricity

board 11 What are the factors are to be considered

for estimating the cost of wiring? A Cost of hard ware and labour B Cost of materials and hard ware C Cost of materials and labours D Cost of materials, hardware and labour 12 When laying of concealed conduits should

be started in a new building? A After completion of main structural civil work B Before finishing the plastering work C Before finishing the white wash and painting

and centring D After completion of civil centring work


Questions: Level 3 1 What is the total connected load of an office

room having 2 numbers of 1200mm fluoresent lamp, 1 fan and one 16 A socket?

A 260 Watts B 280 Watts C 1160 Watts D 1180 Watts 2 What is the minimum recommended size copper

flexible cable required to connect a 3 HP 3 phase motor?

A 1.5 Sq mm B 2 Sq mm C 2.5 Sq mm D 4 Sq mm 3 What is minimum recommended size

copper flexible cable required to connect on 1 HP single phase motor?

A 1.0 Sq mm B 1.5 Sq mm C 2 Sq mm D 2.5 Sq mm 4 What is the minimum recommended size of

conduit required for connecting 5 HP motor with its starter as per the given figure?

A 12.5 mm B 19 mm C 25.4 mm D 38 mm

5 What is the minimum recommended size of conduit required for connecting 1 HP motor with its starter as per the given figure?

A 12.5 mm B 19 mm C 25.4 mm D 38 mm 6 What is the allowable current after

considering the diversity factor in a 240V, 3000 Watts loads in hotel?

A 7.50 Amps B 9.375 Amps C 11.25 Amps D 12.00 Amps 7 What is the allowable current after

considering the diversity factor in a 240V, 2880 Watts lighting load in house as per BIS?

A 7.20 Amps B 7.92 Amps C 9.60 Amps D 12.00 Amps 8 What happens , if undersized cable is used for

connecting pump set motor? A Over voltage and pump speed increases B Under voltage and pump speed decreases C Under loading of the cable and speed

decreases D Overloading of the cable and speed

increases



Module - 8 : Estimation and Costing - Key paper


SL.No Key SL.No Key SL.No Key 1 D 1 B 1 C 2 B 2 D 2 B 3 A 3 C 3 A 4 B 4 B 4 C 5 B 5 B 5 B 6 B 6 A 6 B 7 B 7 A 7 B 8 B 8 A 8 A 9 C 9 A10 A 10 B11 B 11 D12 B 12 D 13 C 14 B 15 A 16 B

Electrician - Semester II - CITS - Module 9 : Power Generation Questions: Level 1 1 Which fuel is available in plenty in India for

power generation? A Coal B Diesel C Gas oil D Gasoline 2 Which is the conventional power generation? A Wind power generation B Tidal power generation C Solar power generation D Thermal power generation 3 Which material is used in solar cell? A Silicon B Copper C Antimony D Phosphorus 4 What is the name of the atomic material

used for nuclear fission in nuclear power station?

A Silicon B Thorium C Antimony D Cadmium 5 Which is the non conventional energy

source? A Wind B Water C Steam D Diesel 6 Which is the natural source of energy? A Sun B Heat C Coal D Biogas

7 Name the constituent marked ‘X’ of the schematic arrangement of hydro electric plant.

A Penstock B Surge tank C Valve house D Power house 8 Which is a non-conventional energy source? A Lignite B Sun rays C Stored water D Pulverized coal 9 Which is the renewable energy source for

producing electricity? A Fuel B Tidal C Water D Nuclear 10 Which energy is converted by the possessed

water potential energy? A Heat energy B Kinetic energy C Electrical energy D Mechanical energy 11 Which is the main source of energy? A Solar B Wind C Water D Fuels 12 Which prime mover cannot be used to

convert heat energy into mechanical energy? A Steam engine B Steam turbine C Internal combustion engines D Pressure combustion engines 13 Which energy source is most complex to

produce electricity? A Fuel B Wind C Water D Atomic material


14 Which power generating plant offers no stand by losses?

A Wind B Diesel C Nuclear D Hydro electric 15 Which electric generating plant offers only

low power generation? A Wind B Nuclear C Diesel plant D Hydro electric 16 Which is the example for a non convention

power generation? A Tidel B Hydel C Nuclear D Thermal /coal 17 Which equipment is excluded in main

constituent in a steam power station? A Prime mover B Condenser C Circuit breaker D Steam generating equipment 18 What is the washing fluid used in a gas

turbine of steam power plant? A Air B LPG C Diesel D Methene gas 19 Which material is used to make solar cell? A Silicon B Antimony C Tantalium D Germanium 20 What is the name of material used for

nuclear fission process in nuclear power plant?

A Uranium B Cadmium C Silicon D Germanium


Questions: Level 2 1 What is the main disadvantage of non-

conventional power generation? A Poor efficiency B No constant generation C Can use only light loads D Heavy load cannot be operated 2 Which power generation requires heavy

water treatment plant? A Hydel power generation B Diesel power generation C Thermal power generation D Nuclear power generation 3 Which device senses the wind speed in a

wind power generation? A Exciter unit B Turbine controller C Chopper controller D Line controller unit 4 Which turbine is used for high heads in hydro

electric power plant? A Kaplan turbine B Impulse turbine C Francis turbine D Reaction turbine 5 What is the function of penstocks in hydro

power stations? A Carries water to dam B Carries water to turbines C Carries water away from power house D Discharges surplus water from reservoir 6 Which is the purpose of boiler in a steam

power station? A Super heats the steam B Heats feed water and air C Converts water in to steam D Liberates the heat from burnt fuel 7 Which type of power plant is more efficient? A Diesel plant B Steam power C Hydro electric D Nuclear power 8 Which material is used as control rod in a

nuclear reactor? A Thorium B Graphite C Cadmium D Tungsten

9 Which is the non conventional power generation?

A Diesel power generation B Nuclear power generation C Wind mill power generation D Hydro-electric power generation 10 Which is the residue of bio-mass? A Slurry B Bio fuel C Manure D Bio gas 11 Which is the main constituent of biogas? A Oxygen B Methane C Hydrogen D Carbon dioxide 12 How electricity produced in solar panel? A While sunlight strikes glass B While sunlight strikes nickel plate C While sunlight strikes manganese D While sunlight strikes on photovoltaic cell 13 What is the function of air pre heater in a

steam power station? A Heats feed water B Supplies hot air to economiser C Supplies hot air to super heater D Extracts heat from flue gases and heats

input air 14 What is the main disadvantage of nuclear

plant? A Disposal of waste B Running cost is more C Plant requires large space D Installed away from load centre 15 What is the function of economiser in steam

power plant? A Converts water into steam B Heats the air by the flue gases C Heats the feed water by the flue gases D Purifies the feed water by chemical treatment 16 What is the disadvantage of diesel power

plant? A Makes more noise B More space is required C Cannot be started quickly D Efficiency is lower than other plants


17 What is the advantage of non conventional power generation?

A More reliable B More efficient C Low initial cost D Reduce pollution 18 What is the function of charge controller in

battery based micro hydel power generation? A Controls the over voltage B Disconnects turbine from the battery C Prevents the over charging of battery D Controls the over speed of the turbine 19 What is the purpose of barrage in tidal power

station? A Controls the tidal waves B Releases water towards the sea C Tap the water at the entrance of gulf D Converts potential energy into kinetic energy 20 Which component in a steam power plant is

used to heat the feed water from the flue gas?

A Boiler B Economizer C Super heater D Air pre heater 21 What is the function of governing system in

diesel power plant? A Start the engine from cold by supplying the

compressed air B Maintain the speed of the engine constant C Control the heat from the engine cylinder to

keep safe temperature D Reduce the friction of moving parts in engine 22 What is the advantage of pressurized water

reactor (PWR)? A No heat loss B High thermal efficiency C High power density D Metal surface temperature is lower 23 Which power generation plant is having more

reliability in operation? A Hydro power plant B Diesel power plant C Nuclear power plant D Thermal power plant

24 Which is the disadvantage of non conventional power generation over conventional power generation?

A Increase pollution B Security risk is more C Requires more maintenance D Cannot be used for base load demand 25 What is the major disadvantage of wind

power generation? A Pollution effect is more B Requires high technology C Plant installation more complicated D Wind power is not constant and steady 26 What is the function of turbine used in tidal

power generation? A Prevents water flow to other parts of dam B Converts potential energy into kinetic energy C Keeps the water flow from low to higher level D Converts kinetic energy into potential energy 27 What is the advantage of non-conventional

energy source? A More reliable B Low initial cost C Efficiency is high D Green house effect is avoided 28 What is the main draw back of wind mill

energy production? A Wind mill installs in hills B Uncertainty of wind available C Wind mill has too heavy structure D It requires large area to install 29 What is the example of a conventional power

generation? A Sun B Tidel C Wind D Nuclear 30 Which item is unavailable in the steam

generating equipment? A Boiler B Super heater C Air preheats D Boiler furnace 31 What is the function of a boiler in the steam

power plant? A Water is converted into steam B Feeds input to economise C Used only for preheating of air D Used for making hot water in the plant


32 What is the function of a surface heater in a steam power station?

A Air pre heating B Supply flue gases to boiler C Raises the temperature of steam D Decrease the temperature of steam 33 What is the function of economiser in the

steam power station? A Heats air for boiler B Heats the feed water C Supply flue gases to boiler D Opens the valve of turbine 34 What is the function of air pre heaters in a

steam power station? A Heats feed water B Supply hot air to economiser C Supply hot air to super heater D Extract heat from flue gases and heat input

air 35 Which device converts steam energy into

mechanical energy in a steam power stations?

A Turbine B Alternator C Condenser D Prime mover 36 What is the function of super charger in the

diesel power plant? A Reduce the air pressure B Increase the air pressure C Increase the engine efficiency D Regulate the diesel consumption 37 Which part of a fuel system is unavailable in

a diesel power plant? A Silencer B Strainer C Storage tank D Fuel transfer pump 38 What is the purpose of cooling system in a

diesel power plant? A Control the oil temperature B Control the strainer temperature C Control the silencer temperature D Control the cylinder temperature

39 Which device is unavailable part of lubrication system in the diesel power plant?

A Filters B Air tank C Oil tank D Oil pump 40 What is the main draw back of gas turbine in

steam power plant A Smaller in size B No stand by losses C No condenser in used D Efficiency and output are low 41 What is the necessity of a combustion

chamber in a gas turbine power plant? A Heating of air B Filtering of air C Compressing of air D Atomization of oil 42 Which energy is utilized to hydro electric

power generation using waters? A Heat energy B Kinetic energy C Potential energy D Magnetic energy 43 Which statement is unrelated to the hydro

electric power stations? A Penstock B Surge tank C Reservoir D Small running charge 44 Which is unrelated for selection of site for

hydro electric power stations? A Transportation B Storage of water C Low capital cost D Availability of water 45 What is the purpose of surge tank in a hydro

electric power plant? A To regulate water flow B To maintain the water level C To reduce the pressure in condenser D To control the water flow in spill ways 46 What is the purpose of using penstocks in

hydro electric power plant? A To control water flow B To maintain water level C Supply water to turbines D To regulate water pressure


47 What factor is irrelevant for selecting steam power stations?

A Supply of fuel B Availability of water C Availability of exports D Transportation facilities 48 Which apparatus used for nuclear fission in a

nuclear plant? A Exciter B Reactor C Condenser D Heat exchanger 49 Which is the disadvantage of nuclear plant? A Disposal of waste B Low running charges C Plant require by space D Installed near to load entre 50 Which material enclose the fuel rods in the

reactor? A Antimay B Graphite C Manganise D Phospherium 51 Which reactor used fuel enriched uranium? A BWR B PWR C Berryllium D Graphite reactors 52 Which is the disadvantage of heat exchanger

in a pressurized water reactor? A Heat loss B Heat regaining C Heat uncontrollable D Heat pressure increases 53 What is used to access the peoples per

capita consumption of energy? A Education level B Health standard C Standard of living D Per capita income 54 Which chemical gas is produced while

forming silicon from silica? A Ammonia B Nitrogen C Chlorine D Carbon dioxide

55 What effect is called heat generating electricity using solar energy on materials?

A Photovoltaic B Electrostatic C Electromotive D Magnetomotive 56 What is the main constituent of biogas? A Hydrogen B Nytrogen C Methene D Carbon dioxide 57 Which mixture of gases is forming from

animal excrete, vegetable waste and under go decomposition?

A LPG B Biogas C Nitrogen gas D Hydrogen gas 58 What is the converting bio mass into liquid

fuels for transportation? A Bio fuels B Bio gases C Bio power D Bio products 59 Which energy of the fuel is converted into

mechanical energy into solarcell? A Heat B Light C Kinetic D Potential 60 What is the name called for the steam

passed into turbine in a steam/thermal power station?

A Combusted steam B Pre heated steam C Pressurized steam D Super heated steam 61 Which is the disadvantage of steam power

plant? A High lubrication cost B High maintenance cost C No continuous over loading D long manufacturing periods 62 Which is the disadvantage of diesel plant

over steam plant? A No ash handling B Unit cost in more C No stand by losses D Installing near to load centre


63 Which material used as control rod in a reactor?

A Mercury B Thorium C Tungsten D Cadmium 64 What is the function of regenerator in a gas

turbine power plant? A Supply air B Heating of air C Compressing of air D Cooling of chamber 65 Which turbine in used for high heads in a

hydro electric power plant? A Francis turbines B Impulse turbines C Kaplam turbines D Reaction turbines 66 What is the function of water turbine? A Drains alternator B It controls water flow C Regulate turbine speed D Decides the potential energy 67 What is the efficiency of a diesel power plant

over steam power plants? A Very low B Very High C Very poor D Medium



Questions: Level 3 1 How the heat is produced for making steam

in a nuclear power station? A By fission method B By doping method C Burning the material D By applying pressure 2 How the potential energy from water flowing

is converted as kinetic energy to generate power?

A By storing water in high quantity B By using surge tanks at the water canal C By using water turbine to drive alternator D By creating high head through penstocks 3 What is the effect of radio active rays

produced during nuclear fission? A Damages the reactors B Creates health hazards C Reduces fission process D Enormous heat is produced 4 What happens to solar cell, if the intensity of

light is low? A Output increases B Output decreases C Output remain same D No output in the cell 5 What is the output voltage of a solar cell, if

light intensity is high? A No output in the cell B Output voltage is increased C No effect and remain same D Output voltage is decreased 6 What is the main reason to keep steam

power station far away from populated areas?

A Any time plant will burst B To avoid people’s interference C Because of environmental reasons D To keep the secrecy of plant operations 7 How to maintain longer life and better

efficiency of boilers in a steam power plant? A Use soft water B Unless quality coal C Remove ash timely D Reduce size of boiler

8 How the disposal of waste in a nuclear power plant is disposed?

A It burnt out B Send for recycling C Dump in open yard D Buried in deep trenches 9 What is the name called for the process of

breaking nucleus of a heavy atom? A Fusion B Fission C Chain fission D Bombardement 10 What is the name called, number of fission

taking place at each successive stage goes on increasing?

A Chain reaction B Successive reaction C Progressive reaction D Continuous reaction 11 Which material is the cause for emitting

poisonous radioactive rays during solar cell fabrications?

A Lead B Antimony C Solarium D Cadmium 12 How the power is governed in the diesel

power plants? A Vaying the fuel B Vaying the voltage C Controlling the load D Adding capacitor bank 13 How the power is produced by wind mills? A Wind mill radiates power B Wind mill drawn generator C Wind mill converts electrical energy D Wind mill blade cuts the wind and produce

power

Module 9 : Power Generation - Key paper


SL.No Key SL.No Key SL.No Key SL.No Key 1 A 1 A 38 A 1 C2 D 2 D 39 D 2 D3 A 3 B 40 D 3 B4 B 4 B 41 A 4 B5 A 5 B 42 B 5 B6 A 6 C 43 D 6 B7 B 7 C 44 A 7 D8 B 8 C 45 A 8 C9 C 9 C 46 C 9 C10 B 10 A 47 C 10 A11 D 11 B 48 B 11 D12 D 12 D 49 D 12 A13 A 13 D 50 B 13 A 14 B 14 A 51 B 15 A 15 C 52 B 16 C 16 A 53 B 17 C 17 D 54 D 18 D 18 C 55 A 19 A 19 C 56 D 20 A 20 B 57 B

21 B 58 B 22 C 59 B 23 C 60 A 24 D 61 D 25 D 62 C 26 B 63 A 27 D 64 C 28 C 65 B 29 D 66 D 30 C 67 B 31 A 32 B 33 A 34 C 35 D 36 A 37 B


Electrician - Semester II - CITS - Module - 10 : Transmission of Electric Power, U.G Cable & Distribution of Power

Questions: Level 1 1 Which electric lines connect the substation

to distributors in distribution system? A Feeders B Distributors C Service lines D Service mains 2 What is the insulation resistance between any

two conductors in a medium voltage domestic installation as per IE rules?

A Infinity B More than one Mega ohm C Below than one Mega ohm D More than 100 Mega ohms 3 What is diversity factor (D.F)? A DF = B DF = C DF = D DF = 4 What is the voltage ratio in A.C distribution

line adopted for domestic consumers? A 415 V/240 V B 240 V/110 V C 415 V/110 V D 11 KV/415 V 5 What is the name of the insulator used in

O.H lines?

A Pin insulator B Post insulator C Strain insulator D Shackle insulator

6 What is the name of line insulator?

A Pin type insulator B Disc type insulator C Shackle type insulator D Suspension type insulator 7 Which is the permissble load for power

circuit in domestic wiring as per IE rules? A 800 W B 1200 W C 2400 W D 3000 W 8 What is the name of the insulator?

A Stay insulator B Shackle insulator C Suspension insulator D Single shed pin insulator 9 Which voltage rate is coming under primary

transmission? A 11 KV B 33 KV C 66 KV D 220 KV. 10 Which voltage rate is coming under

secondary transmission? A 66 KV B 110 KV C 220 KV D 500 KV

load Installed

load actual minimum

load actual minimum

load Installed

load actual

load installed minimum

load installed minimum

load actual


11 Which material is used to make the insulators? A Mica B Ceramic C Asbestos D Parelin clay 12 What is the normal working voltage rate

uses in suspension type insulators? A Beyond 11 KV B Beyond 33 KV C Less than 33 KV D Less than 11 KV 13 What is the maximum span of wooden pole

can be used for distribution? A Upto 25 meters B Upto 50 meters C Upto 75 meters D Upto 100 meters 14 What is the phenomenon known of violet

glow, during noise and producting ozone gas in a OH transmission line?

A Flash B Surge C Corona D Ferranty 15 What is the maximum percentage of

tolerance is allowed in variation of decleared voltage in lines medium voltage makes rule 54?

A 5% B 10% C 2.5% D 7.5%


Questions: Level 2 1 What is the reason for the conductor cross-

sectional area can fully utilised on transmission of DC as compared to AC?

A No heat loss B No skin effect C No power loss D No corona loss 2 Why the disc pin insulators outer surface is made

by glazing and bent the sides inward? A To withstand high voltage B Not to attract birds to sit on it C To offer high mechanical strength D Disables continuous water flow in rainy

season 3 What is the type of over head line joint?

A Twisted joint B Straight sleeve joint C Compression joint for ACSR D Straight joint through connectors 4 Why steel is reinforced in ACSR conductors

used for over head lines? A To minimize the line sag B To reduce the line voltage drop C To increase the tensile strength D To increase the current carrying capacity 5 Which type of A.C transmission is

universallly adopted? A Two phase four wire B Two phase three wire C Single phase two wire D Three phase three wire 6 Which type of line insulator is used for

terminating on corner post? A Pin insulator B Strain insulator C Shackle insulator D Suspension insulator

7 What is the reason of keeping binding wire gap too close and very tight in pin insulator?

A Avoid sparking B Avoid corrosion C Avoid oxide formation D Avoid atmospheric pressure 8 What is the name of conductor used on

overhead lines?? A ACSR B Aluminium C Galvanised iron D Hard drawn copper 9 What is the main purpose of cross arm used in

electric poles? A Supporting the line conductors B Holding the insulators on overhead line C Avoids short circuit between conductors D Reduces conductor sag between supports 10 Which type of line insulator is used at the dead

ends of the H.T overhead lines? A Pin insulator B Disc insulator C Stay insulator D Post insulator 11 What is the advantage of AC power

transmission? A Corona loss negligible B Stress on transmission lines is minimum C Low voltage drop in transmission lines D Voltages can be stepped up and stepped down

easily 12 What is ACSR stands for? A All Conductors Steel Reinforced B Aluminium Core Steel Reinforced C Aluminium Covered Steel Reinforced D Aluminium Conductor Steel Reinforced 13 What is the purpose of cross-arm in O.H

lines? A Provide more support to the O.H pole B Protect from short between conductors C Reduce the sag of the lines between poles D Holding the insulators were the conductors are

fastened


14 What is the advantage of over head lines compared to underground cable?

A Public safety is more B Faults can be located easily C No interference with the communication

lines D Not liable to the hazards from lightning

discharges 15 Which type of lightning arrester?

A Rod gap arrester B Horn gap arrester C Multi gap arrester D Expulsion type arrester 16 Which type of lightning arrester is used for

only for backup protection? A Rod gap arrester B Horn gap arrester C Multi gap arrester D Valve type arrester 17 Which substation the transmission line

voltage is stepped down to consumer supply voltage?

A Mobile substation B Mining substation C Secondary substation D Distribution substation 18 Which insulation material is limited use to

provide insulation to UG cables? A Impregnated paper B Varnished cambric C Rubber mineral compound D Plastic coated PVC sheets 19 What is the purpose of providing metallic

sheets in UG cables? A Protection from heat B Protection from ageing C Protection from moisture D Protection from mechanical damages

20 What is the advantage of UG cable compared to OH line transmission?

A No lightening hazards B Faults can be detected easily C Easy to extend the lines D Less material cost 21 What is the electrical switch gear? A Load control switch B Switching device C Distribution analyser D AC production control 22 How to make contact pressure in pantograph

isolator? A Automatic lever control B By using counter weight C Motorised contact setting D Disc springs arrangement 23 What is the current and voltage in a short

circuited condition? A Both current and voltage is zero B Both current and voltage is same C Current is zero and voltage is maximum D Voltage is zero and current is maximum 24 What is the function of Lightening arrestor? A Protection against surges B Controls high current in line C Protection of line from earthing D Providing voltage regulation in line 25 What is the name called the cable

connected between distributors and consumer load terminal?

A Load line B Power line C Supply line D Service line 26 Which is disadvantage of DC over AC

transmission? A More corona loss B Cannot generate high voltage C Requires more space D More line losses 27 Which is considered as a advantage of DC

over AC for transmission? A No skin effect B High DC voltage can be generated C Frequency related circuits can be used D Step-up or step down using transformer is

possible


28 Which is an advantage of AC over DC for transmission?

A Less corona loss B Less voltage drop C Can be step-up and step down easely D Less line loss 29 Which device converts high power high

voltage AC to DC conventional for transmission?

A Zener diodes B PN junction diodes C High power inverter D Mercurry arc rectifies 30 What is the effect of corona in the line? A No voltage regulation B Line frequency will reduce C Transmission efficiency reduces D Lightening charges are increased 31 What is the effect on conductor. If the

ozone produced by corona? A Reduce resistance B Increase resistance C Reduce tensile strength D Corrossion due to chemical action 32 What is the name called the difference in

level between points of supports and the lower point of the conductor?

A Sag of the conductor line B Distance of the conductor C Tensile strength of conductor D Clearance of the conductor line 33 What is the term called the difference in

voltage at receiving end and sending end expressed in percentage in a transmission line?

A Line constant B Line regulation C Voltage regulation D Transmission regulation 34 What is the function of relay in a switchgear

protection circuit? A Control the circuit current B Regulate the voltage C To detect the fault in circuit D Protect the circuit

35 What is the advantage of ring main distribution system?

A Less voltage fluctuation B direct access of distribution C Increases efficiency of the system D Increase service reliability 36 Where the earth switch is connected in a

substation? A Between isolator switch and earth B Between earth and uncharged conductor C Between power transmission terminal and

earth D Between uncharged conductor and

lightening arrestor 37 Which cooling method used to a 11KV /

440V distribution transmission? A Natural air cooling B Air blast oil cooling C Oil natural air natural D Water cooling method 38 Which electric lines connect generating

station to distributors? A Feeders B Power lines C Service lines D Distribution lines 39 What is the advantage of high voltage AC

transmission? A Reduce power B Reduce current C Reduce resistance D Increase power factor


Questions: Level 3 1 What happens to the string arrangement of

disc insulators, if one of the disc insulator gets damaged?

A Whole string become useless B No effect operates normally C Only the damaged disc will not function D Damaged insulator and the adjacent insulator will

not function 2 How the sparking on the aluminium cored

conductors binding joints can be prevented? A Keeping binding turns very close B Making binding turns very tight C Providing guard wires below the conductors D Providing more than one binding 3 What happens to the skin effect on the O.H

conductors, if the conductor diameter is small (<1cm)?

A Becomes negligible B Increases to maximum C No effect, remain same D Decreases half of the value 4 What is the effect, if the test button marked as ‘X’

is closed permanently in ELCB?

‘X’

A Circuit trips intermittently B Circuit functions normally C Circuit switch off completely D Circuit will not trip on leakage 5 What is the defect in an air circuit breaker, if

trips intermittenly on loading? A Incorrect setting of relay B Excessive heat C Insufficient air pressure D Line voltage is too high 6 What is the defect in oil circuit breaker, if the oil

heats up excessively? A Line voltage is too high B Excessive load C Poor dielectric strength D Defective tripping mechanism

7 What is the cause for the defect if phase to ground fault on the transmission line?

A Components failure B Insulation failure C Skin effect D Fuse failure 8 What is the process of mixing pure rubber with

mineral mattes and sulphur? A Annealing B Compounding C Impregnating D Vulcanizing 9 Why the VIR insulation is generally used

tinned copper conductor? A To prevent electrical fire B To avoid chemical reaction C To reduce electrical losses D To maintain maximum insulation 10 Why the belt is provided in the belted cables? A Protection of leakage current B Preventing conductor temperature C Housing the core material in tight condition D Providing insulation and protection from

moisture 11 What will happen, if the tangertial stresses

set up in paper insulation beyond 22 KV in a belted cable?

A Causes leakage current B Causes insulation failure C Breaks the cable immediately D Causes short circuits instantaneously 12 Why isolator always to be operated after

circuit breaker is opened? A To share the load current B To reduce the breaking line C To avoid huge area quenching D To avoid contact damage 13 What is the intention of glazing the line

insulators in OH lines? A To provide good loading B Avoid birds to set on them C Avoid absorption of moisture D To increase mechanical strength 14 Which is unrelated to the property of pin

insulator in H.V.T transmission lines? A High ratio of puncture B High dielectric strength C High mechanical strength D High brittle resist capacity



15 What will happen, if the pin insulator is porous, lot of impurition and cracks?

A Lowers the permitivity B Lower the dielectric strength C Lowers the electrical resistance D Reduce the ratio of puncture strength 16 Why the steel tower footings are usually

grounded by driving rods? A Prevents surges B Carry high voltage C Minimize lightening troubles D Maintain constant voltage in line 17 What situation OH lines are surrounded by a

faint violet glow formed? A Too much of voltage surges B Size of conductor very small C Not used stranded conductors D Voltage exceeds critical disruptive level 18 Which is to be considered to reduce corona

effect? A Regulate power utilisation B Maintain line voltage constant C Reduce the electro static stresses D Increase the electro static stresses 19 Which fault in power system is no longer

present if, power is disconnected for a short time?

A Transient line fault B Persistant line fault C Symmetric line fault D Asymmetric fault

Module - 10 :Transmission of Electric Power, U.G Cable & Distribution of Power - Key paper


SL.No Key SL.No Key SL.No Key SL.No Key

1 A 1 B 37 B 1 C2 B 2 D 38 A 2 B3 A 3 C 39 B 3 A4 A 4 C 4 C5 D 5 D 5 A6 D 6 C 6 C7 D 7 A 7 B8 D 8 A 8 D9 D 9 B 9 B10 A 10 B 10 D11 B 11 D 11 A12 B 12 D 12 C13 B 13 D 13 C14 A 14 B 14 D15 B 15 A 15 D 16 A 16 C 17 D 17 A 18 C 18 C 19 B 19 A 20 A 21 B 22 D 23 A 24 A 25 D 26 B 27 A 28 C 29 C 30 C 31 D 32 A 33 C 34 C 35 A 36 A


electrician - semester ii - cits - module 1: three phase and single phase induction motor ·...

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