part a basic ee objectives.doc

8/13/2019 Part A Basic EE Objectives.doc

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Objective type questions

1.ELECTRIC WORK POWER AND ENEGRY

1).A kilowatt hour is the unit of

(i) energy (ii) power (iii) electric charge (iv) electric current

2). Heat produced in a conductor depends inversly

(i)on time (ii) directly on time (iii) both (i) and (ii) (iv) none of the above

3) ne kilowatt hour is e!ual to

(i) 3" # 1$3% (ii) 1$3% iii) 3 !1"3# (iv) 1$&%

').he heater element an electric iron is made of (i) nic$rome (ii) iron (iii) tungsten (iv) constantan

&) he heat produced (in k cals) in a resistance ohms when a current * amperes flows

through it for seconds is given by (i) *2t (ii) I%Rt&'.%!1"3 (iii) *2t#'.2 (iv)*t+%

") hree electric bulbs '$ ,- "$ , and 1$$, are designed to work on a 22$ mains.

which bulb will burn most brightly if theyare connected in series across 22$ mains/

(i) "$, (ii) '"W (iii) 1$$ , (iv) all bulbs will burn e!ually brightly

0). wo electric bulbs have tungsten filament of the same length. *f one of them gives "$

, and the other 1$$ ,- then-

(i) 1"" W ()l( $*+ t$ic,er -il*ment(ii) "$ , bulb has thicker filament (iii) both filaments are of the same thickness (iv) information insufficient

). wo electric lamps of '$ , each are connected in parallel. he power consumed by the combination is

(i) 2$, (ii) "$,(iii) $ , (iv) 1$$ ,

).he time re!uired for 1k, heater to raise the temperature of 1$ litres of water through

1$$ is

(i) 21$ sec (ii) '$sec (iii) '2 sec (iv) '%" +ec

1$).*f current in an electric bulb drops by 24- then power decreases by

( i) 24 (ii) ' (iii) * 4 (iv) 1" 4

11).he same mass of copper is drawn into two wires 1mm thick and 3 mm thick. wo

wires are connected in series and current is passed. Heat produced in the wires is in

the ratio(i) /101(ii) 151 (iii) 351 (iv)51

12).he power of a heater is &$$ , at $$6. ,hat will be its power at 2$$6 /

emperature coefficient of resistance is '# 1$7'+6. (i) '' , (ii) "02 , (iii) &2" , (iv) %" W

SIET, Tumkur 1 Dept. ofEEE


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13).he heat produced in a conductor resistance '.28 with 1$ A flowing in a (i) '2 cal+sec (ii) 1"" c*l&+ec (iii) '.2 cal+sec (iv) '2$ cal+sec

1').A heater coil rated at 1$$$,- 22 is connected to 11$ line. 9ower consumed

(i) %" W(ii) &$$ , (iii) 2$$ , (iv) '$$ ,

1&).An electric fan and a heater are marked 1$$ ,- 22$ and 1$$$ ,- 22$ respectively.

he resistance of heater is

(i) :ero(ii) greater than that of fan(iii) le++ t$*n t$*t o- -*n(iv) e!ual to that of fan

1").wo resistances connected in parallel across a cell of negligible internal resistance-

use ' times the power that they would use- when in series across the same cell. *f

one of resistance is 1$ ohm - the resistance of the other is (i)2$ ohm (ii) 1" o$m(iii) '$ ohm (iv) & ohm

10). How much energy is kilowatt7hour is consumed in operating ten &$ , bulbs for

1$ hours per day in the month of %une/ (i) 1&$$ (ii) 1&$$$(iii) 1& (iv) 1"

1). he water in an electric kettle begins to boil in 1& minutes after being switched on.

;sing the same main supply- should the length of wire used as heating element beincreased or decreased if water is to be boiled in 1$ minutes/

(i) increased (ii) decre*+ed(iii) unchanged (iv) none of above

1). A constant voltage is applied between the two ends of a metallic wire of uniform

area of cross7section. some heat is developed. he heat is doubled if (i) both length and radius are halved (ii) (ot$ lengt$ *nd r*di)+ *re do)(led (iii) the radius of wire is doubled(iv) the length of wire is doubled

2$). A uniform wire when connected directly across a 2$$ line produces heat H per

second. *f the wire is divided into n e!ual parts and all the parts are connected in

parallel across 2$$ line- the heat produced per second is (i) H (ii) n$(iii) n2 H(iv) H+n2

21). hree e!ual resistors in series across a source of e.m.f. together dissipate 1$ , of

power. *f the same resistors are connected is parallel across the same e.m.f. source-

the power dissipated will be

(i)1$, (ii)3$ ,(iii) 2" W(iv)1$+3 ,



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22).wo flash light electric incandescent lamps re!uire 3$ A each at l.& . *f they are

placed in series and connected to a " source- there must be connected in series with

them a resistor of (1) ".1 o$m(ii) 12 ohm (iii) " ohm (iv) 3 ohm

23). A 1$$, bulb will give heat and light energy of

(i) 1""#&+(ii) 2$$%+s(iii) &$ %+s (iv) 1&$ %+s

2').


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32).How many calories of heat will appro#imately be developed in 21$,

electric bulb in & minutes/

(i) 1"""(ii) 1$&$ (iii) "3$$$ (iv) $$$

33). A tap supplies water at 226. A man takes 1 litre of water per minute at 306 fromthe geyser. he power of the geyser is

(1) 21$$, (ii) 1&0& ,(iii) &2& , (iv) 1"" W

3').>use wire is a wire of

(i) $ig$ re+i+t*nce *nd lo5 melting 6oint(ii) high resistance and high melting point

(iii) low resistance and low melting point(iv) low resistance and high melting point

3&). ?amps used for house lighting are connected

(i) series (ii) 6*r*llel (iii) mi#ed grouping (iv) arbitrary manner

3"). wo head lamps of a car are in parallel. hey together consume ' , with the helpof a " battery. he resistance of each bulb is

(i )2+3 ohm (iii) ' ohm(ii) 3 ohm (iv) 1. o$m

30).hree identical resistances A- = and are connected to a battery as shown in >ig.

he heat produced is

(i) ma#imum in =(ii) m*!im)m in A(iii) same in A- = and

(iv) same in A as parallel combination of = and

3").wo electric bulbs whose resistances are in the ratio 1 5 2 are connected in parallel to

a constant voltage source. he powers dissipated by them are in the ratio

(i) 152 (ii) 151(iii) 251 (iv) '0l

30)A '$ , tube light is in parallel with a room heater on a main line. ,hat happenswhen light is switched off/

(i) T$e $e*ter o)t6)t rem*in+ t$e +*me(ii) he heater output is larger

(iii) he heater output is smaller (iv) @one of the above

SIET, Tumkur ' Dept. ofEEE


5/55


6/55


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1'). he magnetic flu# density in an air7cooled coil is 1$72,b+m2. ,ith a cast iron core

relative permeability 1$$ inserted- the flu# density will become

(i) 1$7',b+m2(ii) 1$7',b+m2 (iii) 1$72,b+m2(iv< 1 W(&m%

1&).,hich of the following is more suitable the core of an electromagnet (i) +o-t iron =ii) air (iii) steel (iv) tungsten steel

1"). he source of a magnetic field is

(i) an isolated magnetic pole (ii) static electric charge

(iii) magnetic substances (iv) c)rrent loo6

10).A magnetic needle is kept in a uniform magnetic field. *t e#periences

(i) a force and a tor!ue (ii) a force but not a tor!ue

(iii) * tor:)e ()t not * -orce (iv) neither a tor!ue nor a force

1).A+m is the unit of

(i) m.m.f.(ii) reluctance(iii) m*gneti+ing -orce(iv) magnetic flu# density

1). A magnetic needle is kept in a non7uniform magnetic field. *t e#periences

(i) * -orce *nd * tor:)e (ii) a force but not a tor!ue

(iii) a tor!ue but not a force (iv) neither a force nor a tor!ue

2$). agnetic flu# passes more readily through

(i) air (ii) wood (iii) vacuum (iv) iron

21). *ron is ferromagnetic (i) above 00$6 (ii) (elo5 >>"C (iii) at all temperatures (iv) none of the above

22). agnetic lines of force

(i) intersect at infinity (ii) intersect within the magnet

(iii) c*nnot inter+ect *t *ll(iv) none of the above

23)Bemagnetising pf magnets can be done by (i) rough handling (ii) heating

(iii) magnetising in opposite direction (iv) *ll o- t$e *(o7e



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2'),hich of the following has the higest permeability/

(i) paramagnetic (ii) diamagnetic

(iii) -errom*gnetic (iv) vacuum

2& )he unit of relative permeability is (i)A+m (ii) H+m (iii) ,b+m2 (iv< none o- t$e *(o7e

2"). A magnet is kept in air surrounded by an iron ring. he magnetic lines of bit. the

magnet will be

(i) cro5ded in t$e ring (ii) crowded in air

(iii) evenly distributed (iv) none of the above

20)he distance between two magnetic poles-C is doubled and their pole strengths Care

doubled. he force between them (i) increases four times (ii) decre*+e+ -o)r time+

(iv) remains unchanged (iv) none of the above

2).,ill the two conductors in >ig 2.1 repel or attract/.

>ig2.1 (i) repel (ii) *ttr*ct

(iii) neither repel nor attract (iv) data insufficient

2)he magnetic intensity in the solenoid in >ig.2.11 will be

>ig.2.11

(i) same at every point (ii) greatest at the ends of the coil (iii) gre*te+t *t t$e centre o- t$e coil (iv) none of the above

31),hen a charged particle moves through a magnetic field- it suffers a change in (i) direction(ii) speed(iii) energy (iv) no change

32) =y increasing the number of turns 3 times in a toroid- the magnetic flu#

(i) will remain unchanged (ii) 5ill (ecome t$ree time+ (iii) will reduce to one7third (iv) none of the above

SIET, Tumkur Dept. ofEEE


9/55


3.8AGNETIC CIRC?IT

1) *n >ig3.1. the magnetic circuit is the path

>ig3.1

(i) BA= (ii) A@CDA

(iii) A= (iv) A=B

2)*f l is the magnetic path in >ig3.1- then magnetising force is

(i) @* (ii) @*# l (iii) l+@* (iv) NI&l

3)he reluctance of the magnetic shown in >ig. 3.1 is

(i) @*+l (i) D+@* (iii) NI&(iv) D+l

'). he E* unit of reluctance is

(i) AT&W((ii) A+rn(iii) A (iv) @+,b

&).A magnetic circuit has a m.m.f. of '$$ A and a reluctance of 2 # 1$&A+,b. he

magnetic flu# in the magnetic circuit is

(i) 3 # 1$&

,b (ii) % ! 1"3

W((iii) 1& # l$72,b (iv) 2.& # 1$',b

")he reluctance of a magnetic circuit is 77777relative permeability of the material

comprising the circuit.

(i) directly proportional to (ii) in7er+ely 6ro6ortion*l to (iii) independent of (iv) none of the above

0) ..>. in a magnetic circuit in an electric circuit. (i) voltage drop (ii) potential difference

(iii) electric intensity (iv) e.m.-.

). 9ermeance of a magnetic circuit is area of #7section of the circuit. (i) inversely proportional to (ii) directly 6ro6ortion*l to

(iii) independent of (iv) none of the above.

)he magnitude of A re!uired for air gap is much greater than that re!uired for iron

part of a magnetic circuit because777777

(i) air is a gas (ii) *ir $*+ t$e lo5e+t rel*ti7e 6erme*(ility

SIET, Tumkur Dept. ofEEE


10/55


(iii) air is a conductor of magnetic flu# (iv) none of the above

1$). *n electro7mechanical conversion devices (e.g. motors and generators)- a smallairgap is left between the rotor and stator in order to77777

(i) complete the magnetic path (ii) decrease the reluctance of magnetic path

(iii) 6ermit mec$*nic*l cle*r*nce(iv) increase flu# density in air gap

11.) A reluctance of a magnetic circuit depends uponFF

(i) current in the coil (ii) no. of turns of coil (iii) -l)! den+ity in t$e circ)it (iv) none of the above

12) he =7H curve for 777777will be a straight line passing through the origin.

(i) *ir (ii) soft iron (iii) hardened steel (iv) silicon steel

13). ,hatever may be the flu# density in the material will never saturate.

(i) soft iron (ii) cobalt steel (iii) *ir (iv) silicon steel

1') he =7H curve 77777of will not be a straight

(i) air (ii) copper

(iii) wood (iv) +o-t iron

1&) he =7H curve is used to find the m.m.f. of777777in a magnetic circuit.

(i) air gap (ii) iron 6*rt

(iii) both air gap and iron part (iv) none of the above

1") A magnetising force of $$ A+rn will produce a flu# density of777 in air.

(i) 1mW(&m% (ii) 1 ,b+m2

(iii) 1$m,b+m2 (iv) $.& ,b+m2

10) he saturation flu# density for most magnetic materials is about777777

(i) $.& ,b+m2 (ii) 1$,b+m2 (iii) % W(&m% (iv) 1 ,b+m2

1)Hysteresis is the phenomenon of FFFFFFF.in a magnetic circuit. (i) l*gging o- @ (e$ind ; (ii) lagging of H behind =

(iii) setting up constant flu# (iv) none of the above

SIET, Tumkur 1$ Dept. ofEEE


11/55


1) ln >ig. 3.11the point 777777represents the saturation condition.

(i) b (iii) *

(ii) c (iv) e

fig 3.11

2$) *n >ig. 3.1177777 represents the residual magnetism. (i) of (ii) oc (iii) o((iv) none of the above

2"). *n >ig. 3.11 oc represents the

(i) residual magnetism (ii) coerci7e -orce

(iii) retentivity (iv) none of the above

20) *f a magnetic material is located within a coil through which alternating current

(&$H: fre!uency) flows- then 777777hysteresis loops will be formed every second.

(i) " (ii) 2&(iii) 1$$ (iv) 1&$

2). ut of the following materials- the area of hysteresis loop will be at least for (i) wrought iron (ii) hard steel (iii)+ilicon +teel(iv) soft iron

2) he materials used for the core of a good relay should have 77777hysteresis loop.

(i) large (ii) very large

(iii) n*rro5(iv) none of the above



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'.ELECTRO8AGNETIC IND?CTION

1) he basic re!uirement for inducing e.m.f. in a coil is that FFFF..

(i) flu# should link the coil (ii) t$ere +$o)ld (e c$*nge in -l)! lin,ing t$e coil.

(iii) coil should form a closed loop (iv) none of the above

2). he e.m.f. induced in a coil is the 77777rate of change in flu# linkages. (i) directly 6ro6ortion*l to(ii) inversely proportional to

(iii) independent of (iv) none of the above

3) he e.m.f. induced in a coil of @ turns is given by77777 (i) dG+dt (ii) @ dG+dt (iii) 4N dB&dt (iv) @ dt+G

'). he direction of induced e.m.f in a conductor (or coil) can be determined

byFFFF. (i) work law (ii) AmperCs law

(iii) >lemings right hand rule(iv) leming le-t $*nd r)le

&). *n >ig. '.1 the conductor is moving upward. he direction of induced e.m.f. isFFF.

>ig. '.1

(i) from A to = (ii< -rom @ to A(iii) none of the above

"). *n >ig. '.2- the direction of induced e.m.f. in the conductor A is

@ E

>ig. '.2

(i) into the plane of paper(ii) o)t o- 6l*ne o- 6*6er(iii) none of the above



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0). *n >ig. '.2 the rate of change of flu# linkages of conductors A and = is

(*) minimum (ii< m*!im)m (iii) mid7way between (a) and (b) (iv) none of the above

)he e.m.f. induced in a7777 is the statically induced e.m.f

(i) d.c. generator (ii) tr*n+-ormer (iii) d.c. motor (iv) none of the above

) he e.m.f. induced in a is dynamically induced e.m.f.

(i) alternator (ii) transformer (iii) d.c. gener*tor(iv) none of the above

>ig. '.3 >ig. '.'

1$)*n >ig. '.3- 1 single conductor of length lmetres moves at right angles to a uniform

field of = wb+m2with a velocity of v m+s. he e.m.f. induced is 77777777

(i) =l+v (ii) =v+l (iii) @&7(iv) tv+=

11) *n >ig. '.'- the component of velocity that does not induce any e.m.f in the conductoris77777

(i) v sinI (ii) 7 co+ (iii) v tan I (iv) none of the above

12) lnductance opposesFFFFFF. in current in a circuit. (i) only increase (ii) only decrease (iii) c$*nge(iv) none of the above

13) *f the number of turns of a coil is increased- its inductance (i) remains the same(ii) i+ incre*+ed(iii) is decreased (iv) none of the above

1') *f the relative permeability of the material surrounding the coil is increased- theinductance of the coilFFFFFF.

(i) i+ incre*+ed(ii) is decreased (iii) remains unchanged(iv) none of the above

1&) *nductance in a circuitFFFFF..

(i) prevents the current from changing (ii) del*y+ t$e c$*nge in c)rrent (iii) causes power loss (iv) causes the current to lead the voltage

1")he inductance of a coil isFFFFF the reluctance of magnetic path.

(i) independent of (ii) directly proportional to

(iii) in7er+ely 6ro6ortion*l to(iv) none of the above



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20) *f in >ig.'.-G12J2,b-@2J2$ and l2J2$ A- then mutual inductance between the coils

isFFFFFF..

>ig '.

i) 2$$H (ii) 2$H (iii) 'H (iv) %;

2) *f the co7efficient of coupling between two coils is increased- mutual inductance

between the coilsFFFFF.. (i) i+ incre*+ed (ii) is decreased (iii) remains unchanged (iv) none of the above

2) he mutual inductance between two coils is :ero when flu#es produced by them (i) aid each other (ii) oppose each other

(iii) *re *t rig$t *ngle+ to e*c$ ot$er (iv) none of the above

3$)he mutual inductance between two unity7 coupled coils of H and ' H isFFFF (i) 3"H (ii) 13H (iii) 2.2 H (iv) ;

SIET, Tumkur 1& Dept. ofEEE


16/55


.ALTERNATING CIRC?IT

1). he a.c. system is preferred to d.c. system becauseFFFFF. (i) *.c. 7olt*ge+ c*n (e e*+ily c$*nged in m*gnit)de

(ii) d.c. motors do not have fine speed control

(iii) high7voltage a.c. transmission is less efficient (iv) d.c. voltage cannot be used for domestic appliances

2). *n a.c. system- we generate sinewave form becauseFFFF.. (i) it can be easily drawn (ii) it 6rod)ce+ le*+t di+t)r(*nce in electric*l circ)it+ (iii) it is natures standard (iv) other waves cannot be produced easily

3) FFFFFwill work only on d.c. supply (1)


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>ig. &.1$(i) a resistive circuit(ii) a capacitive circuit (iii) *n ind)cti7e circ)it(iv) none of the above

2&).An alternating voltage or current is aFFF..

(i) scalar !uantity (ii) vector !uantity

(iii) 6$*+or(iv) none of the above

2").*n a pure resistive a.c. circuit- the fre!uency of power curve is ............ that of thecircuit fre!uency.

(i) half (ii) t5ice(ii) thrice (iv) same as

20). *n a pure resistive circuit- the instantaneous voltage and current are given by5

J 2&$ sin 31' t volts 1J 1$ sin 31' amperes he peak power in the circuit isF.

(1) 12&$ , (ii) 2& ,(iii) %"" W(iv) 2&$ ,

2).*n the above !uestion- the average power in the circuits isFFF.

(i) 2&$$ , (ii) 2&$ ,

(iii) 2& , (iv) 1%" W

2).he inductive reactance of a circuit is FFFFFfre!uency.

(i) directly 6ro6ortion*l to(ii) inversely proportional to


3$).9ower absorbed in a pure inductive circuit is :ero becauseFFF.

(i) reactive component of current is :ero.(ii) active component of current is ma#imum

(iii) 6o5er -*ctor o- t$e circ)it i+ ero

(iv) reactive and active components of current cancel out

31).,hat is the peak7to7peak value for 12$ a.c /

(i) 2'$ (ii) '$ (iii) 332 F(iv) 31



19/55


32). he average value of 2 A dc current isF.

(1) 1A (ii) 'A (iii) %A(iv) 3 A

33).. he effective value of 2A d.c current is

(1) 1A (ii)'A (iii) 1"A (iv) %A

3'). *f the angular speed of rotation of an armature of alternating current generator is

doubled- then the induced e.m.f. will be (i) t5ice(ii) half (iii) four times (iv) no change

3&). *n an a.c. circuit- the current is given by i J 1$$ sin 2$$t amperes. he time taken

by the current to reach peak value from :ero is (i) 1+1$$ sec (ii) 1+2$$ sec (iii) 1+3$$ sec (iv) 1&'"" +ec

3"). A choke is preferred to a resistance for limiting current in an a.c. circuit because

(i) choke is cheap (ii) t$ere i+ no 5*+t*ge o- energy(iii) current becomes wattles (iv) current strength increases

30). *f an alternating current of &$ H: is flowing in a circuit- the current becomes :ero

(i) &$ times (ii) 2& times (iii) 1"" time+(iv) 2$$ times

3). A current of & mA flows in a resistanceless choke from a 22$ alternating source.

he energy consumed in the choke is

(i) 1$$$% (ii) &$$%(iii) '.' % (iv) ero

3).he average power dissipated in &$ ohm resistor in >ig &.2 is

>ig &.2

(i) 2, (ii) 1.''W(iii) 3.'" , (iv) 1.2& ,

'$). o what value the resistance in the above !uestion be changed if the average power

dissipated in it must be reduced to 1,/

(i) >% (ii) 3"(iii) 2' (iv) 1$

'1). he inductive reactance of an inductor in a d.c. circuit is



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(i) ? (ii) 1+? (iii) ero(iv) infinite

'2).he time period of direct current is (i) in-inite(ii) :ero (iii) finite (iv) cannot say

'3).An electric bulb rated at 22$ is connected to 22$ - & H: a.c. source.hen the bulb(i) does not glow (ii) fuses(iii) glows continuously (iv) glo5+ intermittently

''). he peak7to7peak alternating potential difference across a 1&$ resistor is 33 . he r.m.s. current in the resistor is

(i)$.&A (ii) 1.2A (iii) "./ A(iv) 1." A

'&). An ac. source is 12$ - "$ H:. he value of voltage after 1+ 02$ sec from start is (i)/'./ F(ii) '2.' (iii) 2'.' (iv) &2.2

'").he fre!uency of d.c. in *ndia is

(i) &$H: (ii) 3$ H: (iii) "$ H: (iv) ero

'0). he reactance of a capacitor at &$ H: is & . *f the fre!uency is increased to1$$H:-

the new reactance is

(i) & (ii) %. (iii) 1$ (iv) 2&

').A choke coil is a coil having

(a) low inductance and high resistance (ii) low inductance and low resistance

(iii) $ig$ ind)ct*nce *nd negligi(le re+i+t*nce(iv) high inductance and high resistance

').A pure inductor is connected to an alternating voltage source. *f both the voltage and

the fre!uency are doubled- the circuit current(i) becomes double (ii) is halved (iii) becomes three times (iv) no c$*nge

&$).he voltage across an inductor is v J m sin ( t N 3$6). he current through the

inductor iJ1m sin( t7O). he value of O is

(i) $6 (ii) "$6 (iii) 1%"(iv) none of above

&1). An alternating current varies through complete one cycle in 1 sec. *ts fre!uency is

(i) 1$3H: (ii) 1$' H: (iii) 1" ; (iv) none of above

&2). An alternating current cannot be measured by a d.c. ammeter because

(i) a.c. in virtual (ii) a.c. cannot pass through d.c. ammeter (iii) *7er*ge 7*l)e o- *.c. o7er one cycle i+ ero (iv) none of above



21/55


&3).he purpose of choke in a flourescent tube is

(i) to decrease the current (ii) to increase the current

(iii) to decrease the voltage momentarily (iv) to incre*+e t$e 7olt*ge moment*rily



22/55


9ERIE9 AC CIRC?IT

1).he impedance of an 7? series circuit is given by

(i) MP? (ii) 2 MP2 ? (iii) R

% H% L(iv) none of the above

2).*n an 7? series circuit- line curent(i) leads the applied voltage (ii) l*g+ (e$ind t$e *66lied 7olt*ge

(iii) is in phase with applied voltage (iv) none of the above

3).>or greater accuracy- the value of (i.e.phase angle) should be determined

fromFF

(i) cos (ii) sin (iii< t*n (iv) sec

').he power factor of a d.c. circuit isFFFFF

(i) $ (ii) 1 (iii) N1 (iv) none of the above

&).An inductive circuit draws a line current of1$ A. *f the reactive component of line current is " A- then power factor of the circuit is(i) $." lagging (ii) "./ l*gging(iii) $.& lagging (iv) none of the above

").As the power factor of a circuit is increased-(i) re*cti7e 6o5er i+ decre*+ed(ii) active power is decreased

(iii) reactive power is increased (iv) both active and reactive powers are increased.

0).An 7? series a.c. circuit has 1& across resistor and 2$ across the inductor. hesupply voltage is

(1) 3& (ii)& (iii) %F(iv) 10&

).he power factor of the circuit shown in >ig. ".1is

(i) $. lagging (ii) $.' lagging (iii) $.0& lagging (iv) ". l*gging

>ig ".1

).he power consumed in the circuit shown in>ig. ".1 is(1) '$$$ , (ii) %'"" W(iii) 2$$$ , (iv) 12$$ ,



23/55


1$). he reactive power drawn by the circuit shown in >ig. ".1 is

(i) 2'$$ A (ii) '$$$ A (iii) 3%"" FAR(iv) 2$$$ A

11). he active component of line current in >ig. ".1 is

(i) 1%A (ii) 1"A (iii) 2$A (iv) ' A

12).he value of in the circuit shown in >ig. ".2 is

(i) 1" (ii) 1$ (iii) 3 (iv) '

13).9ower consumed in the circuit shown in >ig. ".2 is

(i) 1%""W(ii) 2$$$, (iii) "$ , (iv) "$$ ,

1'). he power factor of the circuit shown in >ig. ".2 is

(i) $. lagging (ii) $.0& lagging (iii) $.& lagging (iv) ". l*gging

1&). he wattful component of current in the circuit. shown in >ig. ".2 is (1) 1A (ii) 1&A (iii) 1% A(iv) 1" A

1"). he active and reactive components of line current of an inductive circuit are e!ual he power factor of the circuit is

(i) 1 (ii) ".>"> l*gging(iii) $.& lagging (iv) $."" lagging

10). he active and reactive powers of an inductive. circuit are "$ , and $ A

respectively. he power factor of the circuit is

(1) $. lagging (ii) .0& lagging(iii) ". l*gging(iv) $.& lagging

1).he active and apparent powers of an ac. circuit are e!ual in magnitude. he circuit

power factor isFFFFFFFFFF..

(i) $.0$0 (ii) $.& (iii) $. (iv) 1

1). A wattmeter indicates FFFFFFFF.power.

(i) *cti7e(ii) reactive (iii) apparent (iv) none of the above

2$). *f the lagging reactive power of an a.c. circuit increases- the power factor of the

circuit FFFF..

(i) is increased (ii) i+ decre*+ed(iii) remains unchanged (iv) none of the above



24/55


21).eactive power in an a.c. circuit isFFFF

(i) measured by a wattmeter(ii) the useful power

(iii) consumed in the circuit (iv) * li*(ility on t$e circ)it

22). A 2$$ - &$ H: inductive circuit takes a current of 1$A- lagging 3$6. he inductive reactance of the circuit isFFFFFFF.

(i) 2$ (ii) l"(iii) 10.32 (iv) 1"

23). *n an 7? series circuit- the two sides of the impedance triangle that form the phase

angle areFFFFFFFF

(*) and P? (ii) R *nd J (iii) Q and P? (iv) none of the above

2').*mpedance of an a.c. circuit is aFFFFFF..

(i) phasor (ii) vector !uantity (iii) +c*l*r :)*ntity(iv) none of the above

SIET, Tumkur 2' Dept. ofEEE


25/55


> P;O9ER ALGE@RA

1). ,hen a phasor is multiplied by NR- it is rotated through FFFF..in the counter

clockwise direction.

(i) $6 (ii) 1$6 (iii) %>"(iv) none of the above

2). he value of %& is e!ual to

(*) 1 (ii) 1 (ii) N1 (iv) 7 1

3). ,hen a phasor is multiplied by %"- it is rotated throughFFF. in counter

clockwise direction.

(i) '"(ii) 3"$6 (ii) $6 (iv) 20$6

').*f a phasor is multiplied by R- then FFFFF

(i) only its magnitude changes (ii) only it+ direction c$*nge+(iii) both magnitude and direction chage (iv) none of the above

&).in the comple# number ' M R 0- 0 is called the FFFF.component.(i) real (iii) in7phase (ii) imaginary (iv) :)*dr*t)re

"). he reciprocal of a comple# number results in aFFFF..

(i) com6le! n)m(er(ii) real component only

(iii)!uadrature component only (iv) none of the above



26/55


/. T;REE4P;A9E CIRC?IT

(i) *n a two phase generator- the electrical displacement between the two phaseswindings is FFFFFF..electrical degrees.

(i) 12$ (ii) 2"(iii) 1$ (iv) none of the above

2). ln a si#7phase generator- the electrical displacement between different phases

windings is FFFFF..electrical degrees.

(i) "(ii) $ (ii) 12$ (iv) '&

3).he tor!ue on the rotor of a 37phase motor is more constant than that of a single motor

becauseFFFFFFF

(i) single phase motors are not self7starting (ii) single phase motors are small in si:e(ii) 346$*+e 6o5er i+ o- con+t*nt 7*l)e (iv) none of the above

'). >or the same rating- the si:e of a 37phase motor will be F.. single phase motor.(i) le++ t$*n t$*t o-(ii) more than that of (iii) same as that of (iv) none of the above

&). o transmit the same amount of power over a fi#ed distance at a given voltage- the

37 phase system re!uires FFFF.the weight of copper.

(i)3 times (ii) 3&'t$ time+(iii) 1.& times (iv) $.& times

").he phase se!uence of a three7phase system is S=. he other possible phase

se!uence can beFFFFFF..

(i) =S (ii) S= (iii) R@Y(iv) none of the above

0).*f in >ig. .1 the phase se!uence is S=- thenFFFFF..

>ig .1

(i) L15ill ()rn more (rig$tly t$*n L%(ii) ?2will burn more brightly than ?1(iii)both lamps will be e!ually bright (iv)none of the above

).he advantage of star7connected supply system is thatFFFFF..

(i) line current is e!ual to phase current (ii) t5o 7olt*ge+ c*n (e )+ed(iii) phase se!uence can be easily changed (iv) it is a simple arrangement

SIET, Tumkur 2" Dept. ofEEE


27/55


28/55


(i) +ingle 6$*+e(ii) two phase (iii) three phase (iv) none of the above

1"). he resistance between any two terminals of a balanced star7connected load is 12

he resistance of each phase isFFFFF..

(i) l2

(ii) 2'

(iii)

(iv) none of the above

10). he resistance between any two terminals of a balanced delta7connected load is

12 . he resistance of each phase isFFFFFFF. (i) 12 (ii) 1/ (iii) " (iv) 3"

1).*n order to measure power in a 37phase- ' wire unbalanced load- the minimum

number of wattmeters re!uired would beFFFFF (i) 1 (ii) 2 (iii) ' (iv) 3

1)A wattmeter measures power. FFFFF(i) instantaneous (ii) apparent (iii) reactive (iv) *7er*ge

2$).*f the p.f. of the load (phase se!uence is S=) in >ig. .' is $.' thenFFFF..

>ig .'

(i) ,2 will give negative reading

(ii) both ,1and ,2will give negative reading(iii) W15ill gi7e neg*ti7e re*ding(iv) both ,1and ,2will give positive reading

21). *f capacitors of e!ual capacitance are shunted across each phase in >ig. .' - thenF

(i) total power drawn will change (ii) tot*l 6o5er dr*5n 5ill not c$*nge

(iii) power factor of the load remains same (iv) none of the above

22). *n two wattmeter method- the algebraic sum of the readings of two wattmeters willindicate true power only if

(i) the load is balanced

(ii) phase se!uence remains unchanged

(iii) there is no source unbalance (iv) ne)tr*l 5ire *7*il*(le doe+ not c*rry *ny c)rrent



29/55


23).*n the circuit shown in >ig. .&- the wattmeter reads 1$$$,. he total reactive power

drawn by the balanced 37phase load isFFFFF..

>ig .&

(i) 1$$$ A (ii) 2$$$ A (iii) 1>3% FAR(iv) none of the above

2').he measured phase power in a circuit is &$$,. he phase current is & A and

phase voltage is 12$ . he reactive power is

(i) 210.& A (ii) l&2.' A (iii) 13." A (iv) 33l.> FAR

2&). *n the above !uestion- the load p.f. isFFFFF..

(i) "./3%(ii) $.0$0 (iii) $.0"2 (iv)$.3&3

2"). *n a 37phase circuit- the load p.f. is 1.. he relation between apparent power (E) andtrue power (9) is

(1) 9J2E (ii)EJ29 (iii) P 9(iv) none of the above

20). At $6-phase is N 13 -and phase Sis M1&' . he voltage of phase = is

(i) "' (ii)732v (iii) 1" (iv) 41F

2).A lagging power factor can be improved connecting

(i) an inductor in parallel with load (ii) * c*6*citor in 6*r*llel 5it$ lo*d

(iii) a resistor in parallel with load (iv) none of the above

2) ,hen 37phase system is balanced- the neutral wire carriesFFFFF..

(i)no current (ii)one4t$ird o- c)rrent -or e*c$ 6$*+e(iii)half of current for each phase (iv) none of the above

3$). *n a single phase circuit- the instantaneous power varies sinusoidally from :ero to a

peak value atFFFFFFF..

(i) the line fre!uency (ii) t5ice t$e line -re:)ency(iii) thrice the line fre!uency (iv) none of the above



30/55


31). *n a three7phase circuit- the total instantaneous power is e!ual to

*nstantaneous per phase multiplied by

(i) 3 (ii) " (iii) 2.& (iv) 1.

32).*n the two7wattmeter method of 3 phase power measurement- the load is resistive.

he readings of the wattmeters are ,1 C ,2. hen-(i) ,1may be greater than ,2(ii) ,1may be less than ,2(iii) W1 W% (iv) none of the above



31/55


2. ELECTRICAL 8EA9?RING IN9TR?8ENT9

1). An Ammeter isFFFFFF.. instrument.( i) *n indic*ting(ii) an integrating (iii) a recording (iv) none of the above

2). he controlling tor!ue of an indicating instrument FFFF..as the deflection of themoving system increases.

(i) remains unchanged (ii) decreases (iii) incre*+e+(iv) none of the above

3). ,hen the pointer of an indicating instrument comes to rest in the final deflected

positionFFFFFFFF..

(i) only controlling tor!ue acts (ii) only deflecting tor!ue acts

(iii) (ot$ de-lecting *nd controlling tor:)e+ *ct (iv) none of the above

'). ,hen the pointer of an indicating instrument is in motion- then deflecting tor!ue is

opposed byFFFFFF.

(i) controlling tor!ue only (ii) damping tor!ue only(iii) (ot$ d*m6ing controlling tor:)e+ (iv) none of the above

&).he pointer of an indicating instrument is generally made of

(i) copper (ii) *l)mini)m(iii) silver (iv) soft steel

").,hen the pointer of an indicating instrument is in the final deflected positionFF

(i) deflecting tor!ue is :ero (ii) controlling tor!ue is :ero

(iii) d*m6ing tor:)e i+ ero(iv) both deflecting C controlling tor!ues are :ero

0). *n eddy current damping- disc or former is made of a material that is aFF

(i) cond)ctor ()t non4m*gnetic(ii) conductor but magnetic(iii) non7conductor and non7magnetic (iv) non7conductor but magnetic

).*n general- fluid friction damping is not employed in indicating instruments although

one can find its use inFFFFFFF

(i) dynamometer wattmeter (ii) hot7wire ammeter

(iii) induction type energy meter (iv) Kel7in electro+t*tic 7oltmeter

).9ermanent7magnet moving coil instrument can be used forFFFFF.

(i) a.c- work only (ii) d.c. 5or, only(iii) both d.c. and a.c. work (iv) none of the above

1$).he scale of a permanent7magnet moving coil instrument is uniform becauseFFF(i) of effective eddy current damping (ii) e#ternal magnetic fields have no effect

(iii) it i+ +6ring controlled(iv) it has no hysteresis loss



32/55


11). Ehunts are generally made ofFFFFFF.

(i) copper (ii) aluminium (iii) silver (iv) m*ng*nin

12). he range of a permanent7magnet moving coil instrument is $71$ A. *f the full7 scale

deflection current of the meter is 2 mA- then multiplying power of the shunt isFFF.

(i) 2&$$ (ii) 1$$$$ (iii) """(iv) none of the above

13). A moving coil instrument having meter resistance of & is to be used as a

voltmeter of range $71$$ . *f the full7scale deflection current is 1$ mA- then re!uiredseries resistance isFFFFFFFFF..

(i) 2$ (ii) l$$$(iii) 222 (iv) none of the above

1'). he mutliplying power of the shunt of a milliammeter is . *f the circuit current is2$$ mA- then current through the meter isFFFFFFFF

(i) 2$$ mA (ii) % mA (iii) 1"$$ mA iv) none of the above

1&).he material of the shunt should haveFFFFF temperature co7efficient ofresistance.

(i) negligi(le (ii) positive (iii) negative (iv) none of the above

1"). A small swamping resistance is put in series with operating coil of a moving coil

ammeter in order to compensate for the effects of (i) tem6er*t)re 7*ri*tion(ii)e#ternal magnetic fields

(iii)hysteresis loss (iv) none of the above

10).A moving coil voltmeter gives full. deflection of 1$$ for a meter current of 1 mA.>or '& reading- the meter current will beFFF..

(i) $.'& mA (ii) 1.'& mA (iii) %.%% mA(iv) none of the above

1).Bynamometer type instruments can be used ofFFFF.

(i) a.c. work only (ii) d.c. 5or, only

(iii) for both d.c. and a.c. work (iv) none of the above

1). A dynamometer type instrument is chiefly used as a

(i) d.c. *mmeter(ii) d.c. voltmeter (iii) wattmeter (iv) none of the above

2$).Bynamometer type FFFFFhas uniform scale.

(i) ammeter (ii< 5*ttmeter(iii) voltmeter (iv) none of the above

21).he instrument in which springs provide controlling tor!ue as well as serve to lead

current into and out of the operating coil isFFFFFF. instrument.

(i) moving7iron (ii) hot7wire(iii) 6erm*nent4m*gnet mo7ing coil(iv) none of the above

22).*f current through the operating coil of moving7iron instrument is doubled- the

operating force becomesFFFFF.(i) two times (ii) -o)r time+(iii) one7half time (iv) three times



33/55


23).he full7scale deflection current of a moving coil instrument is about

(1) " mA(ii) 1 A (iii) 3 A (iv) 2 A

2').he meter constant of an energy meter is

1&$$ rev+k,h- the disc makes 3$$$ revolutions in a given time. he energy consumed

isFFF(i) 'k,h (iii) 3 k,h (ii) 1 k,h (iv) % ,W$

2&).A 23$ - &$ H: single7phase energy meter has a load current of 1$ A- a p.f. of$. lagging. he energy consumed by the load in 2 minutes is

(i) 1.2 k,h (ii) "." ,W$(iii) 2.' k,h (iv) '.2 k,h

2"). *n the above !uestion- if the disc makes 02 revolutions per minute- what is the meterconstant /

(i) "$$ rev+k,h (ii) $$ rev+k,h (iii) 1%"" re7&,W$ (iv) none of the above

20).*n a single phase energy meter- if the brake magnet is moved towards the centre ofthe spindle- the disc speed

(i) incre*+e+(ii) decreases (iii) remains same (iv )none of the above

2). An energy meter whose meter constant is

1&$$ rev+k,h makes 2$ revolutions in 3$ seconds. he load in k, is(1) 3.2 k, (ii) $. k, (ii) ".' k, (iv) 1. ,W

2)A 23$ single phase energy meter has a constant load current of ' A passing through

if for & hours at unity power factor. *f the meter makes 11$' revolutions during thisperiod- the meter constant is

(1) '$ rev+k,h (ii) %'" re7&,W$(iii) 32$ rev+k,h (iv) "$ rev+k,h

3$)*n the above !uestion if the load p.f. is $.- the number of revolutions the disc will

make in above time (& hours) is about

(i) '"' (ii) &02 (iii) //3(iv) 00'

31).he full7scale deflection current of a permanent magnet moving7coil (9)

meter is 1 mA and the coil resistance is &$. he least voltage that can be measured

with this meter is(i) " mF(ii) 2& m (iii) 1$$ m (iv) none of above

32). *f the full7scale current of a meter is &$ A- then its sensitivity is(i) 1$$$ + (ii) %"""" &F(iii) 1$-$$$ + (iv) data insufficient

33). A 1$$ - full7scale- 1$$ +volt meter has a full7scale deflection current of

(i) $.& m.A (ii) 2mA (iii) 3.& mA (iv) 1 mA



34/55


3'). ,ith a potentiometer- null points are obtained at 1'$ cm and 1$ cm with cells of

e.m.f. 1.l and one of the unknown e.m.f. respectively. he unknown e.m.f. is

(i) 1.1 (ii) 1. (iii) 1.'1 F(iv) 1."

3&). *n a potentiometer e#periment- it is found that no current flows through the

galvanometer when the terminals of the cell are connected across &2cm of potentiometerwire. *f the cell is shunted by a resistance of & - the balance point is found at '$ cm of

the wire from the same end. he internal resistance of the cell is

(i) 1. (ii)2.& (iii) 3(iv)'.&

3"). A potentiometer wire is 1$ m long. *t has a resistance of 2$ . *t is connected in

series with a battery of e.m.f. 3 and negligible resistance and a resistance of 1$ he potential gradient along the wire in volt+ meter is(i) $.' (ii) ".%(iii) $.l (iv) $.3

30). *n a potentiometer e#periment- it is found that no current flows through the

galvanometer when the terminals of the cell are connected across 12& cm potentiometerwire. n shunting the cell by 2 resistor- the balancing length is reduced to half. he

internal resistance of the cell is(i)3 (ii) " (iii) 1 (iv) %

SIET, Tumkur 3' Dept. ofEEE


35/55


1".DC GENERATOR9

1). he yoke of a.d.c. machine is made of......(i) silicon steel (ii) soft iron (iii) aluminium (iv) c*+t +teel

2). he armature of a d.c. machine is made of(i) +ilicon +teel (ii) wrought iron (iii) cast steel (iv) soft iron

3).he coupling field between electrical and mechanical systems of a.d.c. machine is

(i) electric field (ii) m*gnetic -ield

(iii) both electric and magnetic fields (iv) none of the above

').he real working part of a.d.c. machine is theFFFF..

(i) commutator (ii) field winding (iii) *rm*t)re 5inding(iv) none of the above

&)FFFFFFFd.c. machines are most common.

(i) 27pole (ii) '46ole(iii) "7pole (iv) 7pole

").he armature winding of a d.c. machine is placed on the rotor toFFF..

(i) save iron (ii) reduce losses(iii) -*cilil*te comm)t*tion(iv) reduce armature reaction

0).he yoke of a.d.c. machine carriesFFFFFF pole flu#.

(i) the (ii) one4$*l- o-(iii) two times the (iv) none of the above

).A '.pole d.c. machine has magnetic FFFFcircuits.

(i) 2 (ii) (iii) '(iv) none of the above

).he field structure of a d.c. machine usesFFFF.

(i) +*lient46ole (ii) non7salient pole arrangement arrangement(iii) both (i) and (ii) (iv) none of the above

1$).Emall d.c. machines generally have FFFFFFF..poles(i) ' (ii) " (iii) % (iv)

11).he armature of a d.c. machine is laminated in order to reduce(i) eddy c)rrent lo++(ii) hysteresis loss (iii) copper loss (iv) frictional loss

12).he current in armature conductors of a d.c. machine isFFFF.(i) pure d.c. (ii) pulsating d.c.

(iii) *.c. (iv) pure d.c. plus pulsating d.c.

13).he greatest eddy current loss occurs in the FFFFF.of a d.c. machine. (i)field poles(ii) yoke(iii) commutating poles (iv) *rm*t)re



36/55


1'). he brush voltage drop in a d.c. machine is ? about

(i) $l (ii)1$ (iii) % F(iv)2$

1&). arbon brushes are used in a d.c. machine becauseFFFFFF

(i) c*r(on l)(ric*te+ *nd 6oli+$e+ t$e comm)t*tor(ii) contact resistance is decreased

(iii) carbon is cheap (iv) none of the above

1"). he armature winding of a d.c. machine is FFFF.winding.(i) an open7circuit (ii) * clo+ed4circ)it

(iii) partly open circuit and partly closed circuit (iv) none of the above

10). he commutator pitch for a simple# lap winding is e!ual toFFFF.(i) number of poles of the machine (ii) pole pairs

(iii) 1(iv) none of the above

1). *n a simple# wave winding- the number of parallel paths is e!ual toFFF.(i) number of poles in the machine (ii) %

(iii) number of pairs of poles (iv) none of the above

1)he number of parallel paths in a simple# lap winding is e!ual toFFFF.

(i) 2 (ii)number of pairs of poles(iii)n)m(er o- 6ole+ (iv)none of the above

2$).*n a dc. machine- the number of commutator segments is e!ual toFFF

(i) number of conductors (ii) twice the number of poles(iii) n)m(er o- coil+(iv) none of the above

21).he nature of armature winding of a d.c. machine is decided byFFFF..(*) front pitch (ii) comm)t*tor 6itc$(iii) back pitch (iv) none of the above

22).High7voltage d.c. machines use FFFFF winding.(i) lap (ii) 5*7e(iii) either lap or wave (iv) none of the above

23).*n a lap winding- the number of the brushes re!uired is e!ual toFFF..

(i) n)m(er o- 6ole+(ii) number of pairs of poles(iii) commutator pitch (iv) none of the above

2').*n a wave winding- the commutator pitch is appro#imately e!ual toFFFF.(i) pole pitch (ii) t5ice t$e 6ole 6itc$(iii) thrice the pole pitch (iv) none of the above

2&).>or a given number of poles (V 2) and armature conductors- a lap winding willcar:y FFFFa wave winding.

(i) more c)rrent t$*n(ii) less current than

(iii) same current as (iv) none of the above

SIET, Tumkur 3" Dept. ofEEE


37/55


2")An 7pole- 2&$ . wave7wound generator has '$$ conductors. *f the generator is to

be lap7wound- the number of condact re!uired isFFFFFF..

(i) $$ (ii) 1$$ (iii) 32$$ (iv) 1""

20)An 7pole duple# lap winding will haveFFFF. parallel paths

(i) (ii) ' (iii) 32 (iv) 1

2).A triple# wave winding will have FFFF..parallel paths.

(i) (ii) 2 (iii) ' (iv) none of the above

2)>or a given d.c. generator- the generated voltage depends uponFFFF.

(i) flu# only (ii) speed only (iii< (ot$ +6eed *nd -l)!(iv) none of the above

3$).A "7pole lap7wound generator has 3$$ conductors-the e.m.f. induced per conductors

being & . he generated voltage of the generator isFFFF

(i) "$ (ii) 1&$$ (iii) 3"$ S (iv) %" F

31).>or the same rating- a d.c. machine has FFFF..an a.c. machine.

(i) the same weight as (ii) more 5eig$t t$*n(iii) less weight than (iv) none of the above

32)he field winding of a d.c. shunt machine usually carries FFFFof the rated current

of the machine.(1) % to (ii) 1&4 to 2$4 (iii) more than 2$4 (iv) less than $.&4

33).A separately e#cited d.c. generator is not used becauseFFF..

(i) it is costly (ii) +e6*r*te d.c. +o)rce i+ re:)ired -or -ield circ)it(iii) voltage drops considerably with load (iv) none of the above



38/55


11. DC 8OTOR9

1. A d.c. motor is used to FFFFF(i) generate power (ii) change mechanical energy to electrical energy

(iii) c$*nge electric*l energy to mec$*nic*l energy(iv) increase energy put into it

2. A d.c. motor is still used in industrialFFFFF..applications because it

(i) is cheap (ii) is simple in construction

(iii) 6ro7ide+ -ine +6eed control(iv) none of the above

3. arbon brushes are preferable to copper brushes becauseFFFFFFF

(i) they have longer life (ii) they reduce armature reaction(iii) they have lower resistance (iv) t$ey red)ce +6*r,ing

'. he field poles and armature of a d.c machine are laminated toFFFFF(i) reduce the weight of the machine (ii) decrease the speed

(iii) red)ce eddy c)rrent+(iv) reduce armature reaction

&. he back e.m.f. in a d.c. motor(i) O66o+e+ t$e *66lied 7olt*ge(ii) aids the applied voltage

(iii) aids the armature current (iv) none of the above

". he value of back e.m.f. (


39/55


12. he tor!ue developed by a d.c. motor is directly proportional toFFF..

(i) -l)! 6er 6ole ! *rm*t)re c)rrent(ii) armature resistance # applied voltage

(iii) armature resistance P armature current (iv) none of the above

13). he shaft tor!ue (Eh) in a d.c. motor is less than total armature tor!ue (a) because

of in FFFFFthe motor.(i)u losses (ii) field losses (iii) iron *nd -riction lo++e+(iv) none of the above

1').Armature reaction in a d.c. motor is increasedFFFF.(i) 5$en t$e *rm*t)re c)rrent incre*+e+(ii)when the a

.rmature current decreases

(ii when the field current increases (iv) by interpoles

1&).,ith respect to the direction of rotation- interpoles on a d.c.- motor must have the

same polarity as the main polesFFFFFF

( i)ahead of them (ii) (e$ind t$em(iii) none of the above

1").ln a d.c. motor- the brushes are shifted from the mechanical neutral plane in a

direction opposite to the rotation toFFF.( i)decrease speed (ii) increase speed

(iii) red)ce +6*r,ing(iv) produce flat haracteristics

10).*n very large d.c. motors with severe heavy duty- armature reaction effects are

corrected byFFFFFFF

(i) using interpoles only (ii))+ing com6en+*tory 5inding+ in *ddition to inter6ole+

(iii) shifting the brush position. (iv) none of the above

1).he speed of aFFFFF. motor is practically constant.

(i) cumulatively compounded (ii) series (iii) differentially compounded (iv) +$)nt

1).FFFFmotor is variable speed motor.

(i) +erie+(ii) shunt (iii) cumulatively compounded (iv) differentially compounded.

2$).he most commonly used method of speed control of a.d.c. motor is by varyingFF

(i) voltage applied to the motor (ii) -ield +trengt$

(iii) effective number of conductors in series (iv) armature circuit resistance

21). he running speed of a d.c. series motor is basically determined by FFFFFF

(i)field e#citation (ii) lo*d (iii) armature resistance (iv) none of the above

22) After a shunt motor is up to speed- the speed may be increased considerably by FF..

(i) increasing field circuit resistance (ii) decre*+ing -ield circ)it re+i+t*nce(iii) increasing armature circuit resistance (iv) reducing the load.

23)FFF... motor has the best speed regulation.

(i) series (ii) cumulatively compounded (iii) +$)nt(iv) differentially compounded.



40/55


41/55


3").heFFFF. motor is used to start heavy loads.

(i) +erie+ (ii) shunt (iii) differentially compounded (iv) none of the above

30). ,hen load is removed- the motor that run at the highest speed is theFFF. motor.

(i) shunt (ii) +erie+(iii) cumulatively compounded (iv) differentially compounded

3). >or the same rating FFF..motar the least starting tor!ue.

(i) cumulatively compounded (ii) series (iii) +$)nt

3). A d.c. series motor is most suitable forFFFFF..

(i) cr*ne+ (ii) pump (iii) lathes (iv) punch presses

'$). FFFFmotor is most suitable punch presses.(i) shunt (ii) series (iii) di--erenti*lly com6o)nded(iv) cumulatively compounded

'1) *n a vacuum cleaner- we generally useFFFF motor.

(i) shunt (ii) cumulatively compounded (iii) +erie+(iv) differentially compounded

'2). he most suitable motor for elevators isFFFFFF motor.(i)Eeries (ii) shunt

(iii) differentially compounded (iv) c)m)l*ti7ely com6o)nded

'3). he friction and windage losses in a d c motor depends uponFFFFF.

(i) +6eed(ii) flu# (iii) armature current (iv) field and armature resistance

'').he iron losses in a d.c. motor depend uponFFFFF..(i) flu# only (ii) speed only (iii)(ot$ -l)! *nd +6eed (iv) none of the above

'&).he greatest percentage of power loss in a d.c. motor is due toFFFF(i) windage loss (ii) co66er lo++(iii)core loss (iv) friction loss

'").A motor takes a large current at starting becauseFFFFF.(i)the armature resistance is high (ii) (*c, e.m.-. i+ lo5(iii) shunt field is producing weak field (iv) none of the above

'0).


42/55


&$).Hot bearings of a d.c. motor may be caused byFFF..

(i) poor ventilation (ii) incorrect voltage

(iii) loose coupling (iv) l*c, o- or dirty l)(ric*nt

&1). *ntermittent sparking at the brushes of a d.c. motor may be caused due toFFF.

(i) *n o6en *rm*t)re coil(ii) intermittent load(iii) loose coupling (iv) incorrect voltage

&2). A 22$ d.c. shunt motor takes a total current of $ A and runs at $$ r.p.m.esistance of shunt field is &$ and that of armature $.1. he iron and friction losses

amount to 1"$$ ,. ,hat is the driving power of the motor/

(i) 1"" W(ii) 1'&$$ , (iii) 12"$$ , (iv) 1&$$ ,

&3). *n !uestion &2- what is =.H.9./

(i) 1&.0& (ii) 11.0 (iii) 1'.2 (iv) 12.3>

&'). *n !uestion &2- find the copper losses/(i) 112$, (ii) 1"W(iii) 100& , (iv) 11'$ ,

&&). *n !uestion &2- what is the armature tor!ue/

(i) 212@m (ii) 10" @m (iii) 12% Nm(iv) 2'2 @m

&"). *n !uestion &2- what is the lost tor!ue/

(i) 11@m (ii) l2Nm(iii) 22 @m (iv) 3' @m

&0). *n !uestion &2- what the shaft tor!ue/(1) 122 @m (ii) 211 @m (iii) 1"' @m (iv) 1>3 Nm

&). A d.c. shunt motor takes &A at 1$$ when running light. Ehunt field resistance is&$and armature resistance is $.2. ,hat is the driving power/

(i) '12 , (ii) %2/ W(iii) 3$& , (iv) 2$' ,

&)he iron losses n ad.c. motordepend uponFFF

(i) flu# only (ii) speed only (iii)both flu# and speed


"$)he greatest percentage of power loss in a d.c. motor is due toFFFFF

(i) windage loss (ii) copper loss core loss (iv) friction loss

SIET, Tumkur '2 Dept. ofEEE


43/55


44/55


12). A transformer is so designed that primary and secondary haveFFF.

(i) high leakage reactance (ii) large resistance

(iii) tig$t m*gnetic co)6ling(iv) good electric coupling

13). ,hen the primary of a transformer is connected to a d.c. supplyFFFFF..

(i). primary draws small current(ii)priwary leakage reactance is increased

(iii) core tosses are increased (iv) 6rim*ry m*y ()rn o)t

1'). An ideal transformer is one whichFFFF

(i) $*+ no lo++e+ *nd le*,*ge re*ct*nce (ii) does not work

(iii) has same number of primary and secondary turns (iv) none of the above

1&). A low7voltage outdoor lighting system uses a transformer that steps 12$ down to

2' for safety. he e!uivalent resistance of all low7voltage lamps is ." . ,hat is the

current in the secondary coil/ Assume the transformer is ideal and there are no losses in

the line.(i) 2A(ii) %. A(iv) l.&A (iii) '.& A

1"). *n the above !uestion- what is the current in the primary coil/

(i) 1.&A (ii) '.&A (iii) 2.& A (iv) ". A

10). *n X. 1&- how much power is used/

(i) 3$ , (ii) 2$ ,

(iii) " W(iv) '$ ,

1).. A transformer has an efficiency of $4 and works at 1$$ - ' k,. *f the secondary

voltage is 2'$ - find the primary current/

(i) '"A(ii) 3$A (iii) 2$ A (iv) 1$ A

1). wo things which are same for primary and secondary of transformer are FF.

(i) *m6ere4t)rn+ *nd 7olt*ge 6er t)rn(ii) resistances and leakage reactances(iii) currents and induced voltages (iv) none of the above

2$). A transformer operates poorly at very low fre!uencies becauseFFF.

(i) permeability of core is increased (ii) m*gneti+ing c)rrent i+ *(norm*lly $ig$(iii) primary reactance is too much increased (iv) none of the above

21). *f a power transformer is operated at very high fre!uencies- thenFFFF..(i) primary reactance is too much increased (ii) primary will draw large power

(iii) core lo++e+ 5ill (e e!ce++i7e(iv) none of the above

22). he primary leakage flu# linksFFFFFFFF

(i) 6rim*ry 5inding only(ii) secondary winding only

(iii) both primary and secondary windings (iv) none of the above

SIET, Tumkur '' Dept. ofEEE


45/55


23). he effect of leakage flu# in a transformer is toFF..

(i) increase copper losses (ii) decrease copper losses

(iii) c*)+e 7olt*ge dro6 in t$e 5inding+(iv) none of the above

2'). ?eakage flu# in a transformer occurs because

(i) iron core has high permeability(ii) *ir i+ not * good m*gnetic in+)l*tor

(iii) applied voltage is sinusoidal

(iv) transformer is not an efficient device

SIET, Tumkur '& Dept. ofEEE


46/55


13.T;REE P;A9E IND?CTION 8OTAR

1). hestator of a 37phase induction motor produces FFFFF..magnetic field(i) steady (if) rot*ting(iii) alternating (iv) none of the above

2). An induction motor is preferred to a d.c motor because itFFFFFFF(i) provides high starting tor!ue

(ii)provides fine speed control

(iii) $*+ +im6le *nd r)gged con+tr)ction(iv) none of the above

3). A 37phase induction motor isFFFF

(i) e++enti*lly * con+t*nt4+6eed motor(ii) a variable speed motor(iii) very costly (iv) not easily maintainable

'). he air7gap between stator and rotor of a 37phase induction motor ranges fromF

(i) 2 cm to ' cm (ii) ".' mm to ' mm(iii) l cm to 2 cm (iv) ' cm to " cm

&). *f the fre!uency of 37phase supply to the stator of a 37phase induction motor is increased- then synchronous speedFFFFF

(i) is decreased (ii) i+ incre*+ed

(iii) remains unchanged (iv) none of the above

"). *f @Eis the speed of rotating flu# and @ the speed of the rotor- then- the rate at which

the flu# cuts the rotor conductors is directlyproportional to

(i) @E(ii) @(iii) N9 N(iv) @7 @E

0). *n a 37phase induction motor- the rotor speed isFFFF.the synchronous speed

(i) greater than (ii) +m*ller t$*n(iii) e!ual to (iv) none of the above

). he synchronous speed of a 37phase induction motor having 2$ poles and connected

to a &$ H: source isFFFFFF.

(i) "$$ r.p.m. (ii) 1$$$ r.p.m (iii)12$$ r.p.m. (iv) 3"" r.6.m

). ,hen a 37phase induction motor is at no load- the slip isFFFF.

(i) 1 (ii) $.& (iii) 6r*ctic*lly ero(iv) $.2

1$). ,hen the rotor of a 37phase induction motor is blocked- the slip isFFFFFF..

(i) :ero (ii) $.& (ii-) $.l (iv) 1

SIET, Tumkur '" Dept. ofEEE


47/55


11). *n >ig. 13.1 the rotor fre!uency isF.. when the motor is at standstill.

>ig 13.1

(i) :ero (ii) 2& H: (iii) " ;(iv) none of the above

12). he full7load slip of a 37phase induction motor ranges fromFFFF.

(i) 1$4 to 2$4 (ii) 2$4 to 3$4 (iii) % to (iv) none of the above

13).he direction of rotation of field in a 37phase induction motor depends uponFFF

(i) number of poles (ii) magnitude of supply voltage(iii) supply fre!uency (iv) 6$*+e +e:)ence o- +)66ly 7olt*ge

1').he rotor winding of a 37phase wound rotor induction motor is generallyconnectedFFF..

(i) +t*r(ii) delta (iii) partly star and partly delta (iv) none of the above

1&) 37phase wound rotor motors are also called FFFFF.motors.(i) synchronous (ii) +li6 ring(iii) series (iv) commutator

1"). he advantage of wound rotor motor is thatFFFF(i) it is ine#pensive (ii) it re!uires less maintenance

(iii) e!tern*l re+i+t*nce c*n (e in+erted in t$e rotor circ)it(iv) none of the above

10). A wound rotor motor is mainly used in applications whereFFFF.

(i) $ig$ +t*rting tor:)e i+ re:)ired(ii) speed control is re!uired

(iii) less costly motor is not re!uired (iv) high rotor resistance is re!uired during running

1). he tor!ue characteristic of a 37phase induction motor is similar to that ofFF.

(i) d.c. series motor (ii) d.c. +$)nt motor(iii) d.c. differentially compounded motor (iv) d.c. cumulatively compounded motor

1). *n a wound rotor motor- the rotor winding is wound for poles FFFthat of statorwinding.

(i) e:)*l to(ii) greater than (iii) small than (iv) none of the above

SIET, Tumkur '0 Dept. ofEEE


48/55


2$).,ound rotor motors are less e#tensively used than s!uirrel cage motors because

(i) slip rings are re!uired on the rotor circuit(ii) rotor windings are generally S7connected

(iii) t$ey *re co+tly *nd re:)ire gre*ter m*inten*nce(iv) none of the above

21).A '7pole- &$ H: induction motor operates at &4 slip. he fre!uency of e.m.f. induced

in the rotor will beFFFFFF..(i) 2& H: (ii) &$ H: (iii) %. ;(iv) none of the above

22).he ma#imum voltage is induced in the rotor of a 37phase induction motor when itF.(i)runs at no load (ii) runs at full load (iii) i+ (loc,ed(iv) none ofthe above

23).he reactance of the rotor circuit of a 3. phase induction motor is ma#imum at

(i) no7load (ii) full7load (iii) half full7load (iv) +t*rting

2').he rotor current in a 37phase induction motor isFFFF. slip.

(i) inversely proportional to (ii) directly 6ro6ortion*l to


2&).At starting- rotor reactance of a 37phase induction motorFFFF is rotor resistance.(i) small as compared to(ii) e!ual to that of

(iii) l*rge *+ com6*red to(iv) none of the above

2").,hen an induction motor is running at full7 load- rotor reactance isFFF.. rotor

resistance.

(i) com6*r*(le to(ii) very large compared to(iii) large compared to (iv) none of the

above

20). *f the slip of a 37phase induction motor increases- the p.f. of the rotor circuitFF

(i) is increased (iii) i+ decre*+ed(iii) remains unchanged (iv) none of the above

2). he magnetising current drawn by a 37 phase induction motor is aboutF.. offull7load stator current.

(1) &4 (ii) l$ tol&4 (iii) 1& to2$4 (iv) 3" to "

2). A high starting tor!ue can be obtained in a 37phase induction motor byFFF..(i) incre*+ing rotor re+i+t*nce(ii) decreasing rotor resistance

(iii) increasing rotor reactance (iv) none of the above

3$). he starting tor!ue of a 37phase induction motor is FFFFFF.supply voltage.

(i) independent of (ii) directly proportional to

(iii) directly 6ro6ortion*l to +:)*re o-(iv) none of the above

31). he starting tor!ue of an induction motor is ma#imum when rotor resistance per

phase isFFFFFF. rotor reactance+phase.

(i) e:)*l to(ii) two times (iii) four times (iv) none of the above



49/55


32). ;nder running conditions- the ma#imum tor!ue of 37phase induction motor will

occur at that value of slip at which rotor resistance+phase isFF. otor resistance+phase

(i) two times (ii) four times (iii) e:)*l to(iv) none of the above

33). he ma#imum tor!ue of a 37phase induction motor under running conditions isFF.

(i) inversely proportional to supply voltage(ii) in7er+ely 6ro6ortion*l to rotor re*ct*nce *t +t*nd+till

(iii) directly proportional to rotor resistance (iv) none of the above

3'). *f the supply voltage of a 37phase induction motor is increased two times- then-

tor!ue

(i) increased two times (ii) decreased two times

(iii) incre*+ed -o)r time+(iv) decreased four times

3&). he 37phase induction motor is so designed that the rotor should have FFFFF

under running conditions.

(i) high resistance (ii) high reactance (iii) large slip (iv) lo5 re+i+t*nce

3"). >riction and windage loss of a 37phase induction motor areFFFFF..(i) m*!im)m *t no4lo*d(ii) minimum at no7load

(iii) remains the same at all loads (iv) none of the above



50/55


1.ALTERNATOR9

1).aRority of alternators in the use haveFFFFFF(i) revolving a.c. armature winding (ii) stationaiy field type construction

(iii< re7ol7ing -ield ty6e con+tr)ction(iv) none of the above.

2).he stator of an alternator is identical to that of aFFFFF.

(i) d.c. generator (ii) 346$*+e ind)ction motor

(ii) 17phase induction motor (iv) osenberg generator

3).he stator of an alternator rarely uses FFFFFslots.

(i) wide open type (ii) semi7closed type (iii) clo+ed ty6e(iv) none of the above

').he field winding of an alternator isFFFFF. e#cited.

(i) d.c. (ii) a.c. (iii) both d.c. and a.c.(iv) none of the above

&).he ac- armature winding of an alternator operates atFFF.. the field winding.(i) the same voltage as (ii) much lesser voltage than

(iii) m)c$ $ig$er 7olt*ge t$*n(iv) none of the above

"). he salient7pole construction for field structure of an alternator is generally used for

FFFF..machine.(i) 27pole (ii) '7pole (iii) /46ole(iv) none of the above

0).An alternator is sometimes called FFFFFF..generator.

(i) +ync$rono)+(ii) asynchronous (iii) osenberg (iv) none of the above

).A turbo7alternator usesFFFFF..

(i) salient7pole field structure (ii) non+*lienc46ole -ield +tr)ct)re(iii) rotating a.c. armature winding (iv) none of the above.

). he nonsalient7pole field construction is used for FFFFFFalternator.(i) low7speed (ii) medium7speed (iii) $ig$4+6eed(iv) none of the above

1$). he a.c. armature winding of an alternator isFFFFFFFF..

(i) *l5*y+ +t*r4connected(ii) generally delta7connected(ii-) star7delta connected (iv) noneof the above

11). ?ow7speed alternators are driven byFFFFFFF(i) $ydr*)lic t)r(ine+ =ii) steam engines (iii) steam turbines (iv) none of the above

12). High7speed alternatorsFFFFFFF.(i) diesel engines (ii) hydraulic turbines (iii) +te*m t)r(ine+(iv) none of the above

13). he air7gap in an alternator isFFFFFFFFF.. in an induction machine.

(i) much shorter than(ii) m)c$ longer t$*n(iii) about the same as (iv) none of the above

SIET, Tumkur &$ Dept. ofEEE


51/55


1'). he stator of an alternator is wound forFFFF. on the rotor.

(i) more number of poles than (ii) less number of poles than

(iii) t$e +*me n)m(er o- 6ole+ *+(iv) none of the above

1&). urbo7alternators have rotors ofFFFFF.

(i) +m*ll di*meter *nd long *!i*l lengt$(ii) large diameter and long a#ial length(iii) large diameter and small a#ial length (iv) same diameter and a#ial length

1"). he rotor of a turbo7alternator is made cylindrical in order to reduceFFFF.(i) eddy current loss (ii) hysteresis loss (iii) 5ind*ge lo++e+(iv) none of the above

10). he number of cycles generated in a "7pole alternator in one revolution isFFF

(i)3(ii) " (iii) &$ (iv) none of the above

1). he speed at which a "7pole alternator should be driven to generate &$ cycles per

second isFFFF..

(a) 1&$$ r.p.m (ii) 1""" r.6.m. (iii) &$$ r.p.m. (iv) none of the above

1. he fre!uency of e.m.f. generated in an 7 pole alternator running at $$ r.p.m. isF(i) &$ H: (ii) " ;(iii) 12$ H: (iv) none of the above

2$). *n case of a '7pole machine- 1 mechanical degree corresponds to electrical degrees.

(i) %(ii) ' (iii) (iv) none of the above

21). >or the same rating- the si:e of low7speed alternator isFFF.. that of high7speedalternator.

(i) about the same as(ii) more t$*n(iii) less than (iv) none of the above

22). he synchronous reactance of an alternator is due toFFFFFF

(1) leakage flu# (ii) d.c. field e#citation (iii) *rm*t)re re*ction(iv) none of the above

23). he synchronous reactance of an alternator is generally FF..armature resistance.

(i) & times smaller than (ii) & times greater than

(iii) 1" to 1"" time+ gre*ter t$*n(iv) 1$ times smaller than

2'). he synchronous reactance of an alternator FFFFF.as the iron is saturated.

(i) decre*+e+ (ii) increases (iii) remains unchanged (iv) none of the above

2&). *n an alternator- the effect of armature reaction is minimum at power factor ofFFF

(a) $."" lagging (ii) $."" leading (iii) $.& lagging (iv) )nity

2"). *f the lagging load p.f. of an alternator is decreased- the demagnetising effect of

armature reactionFFFF.

(i) remains the same(ii) is decreased (iii) i+ incre*+ed(iv) none of the above

SIET, Tumkur &1 Dept. ofEEE


52/55


20). A 37phase alternator generates an open.circuit phase voltage of '$$$ when

e#cithig current is &$ A Y the short7circuit current for the same e#citation being $$ A-

he synchronous reactance per phase isFFFFFF.(a) $ (ii) (iii) 1& (iv) none of the above

2). A 3$ A- 1& k alternator will have a per phase nominal impedanceofFFFFF.

(a) (ii) 1& (iii) >.( (iv) none of the above

2). ,hen load on an alternator is increased- the terminal voltage increases if the load pf

isFFFFF

(i) unity (ii) lagging (iii) le*ding(iv) :ero

3$). he efficiency of the turbo7alternator FFFFFwith increase in speed.

(i) decreases (ii) incre*+e+(iii) remains unchanged (iv) none of the above

31). he full7load efficiency of an alternatorFFF.. with the si:e of the machine..(i) incre*+e+ (ii) decreases (iii) remains unchanged (iv) none of the above

32). >or the same power rating- an alternator isFFFF.. that of a d.c. generator.

(i) larger in si:e than (ii) +m*ller in +ie t$*n

(iii) of the same si:e as(iv) none of the above



53/55


1.PARALLEL A.C. CIRC?IT9

1).Bomestic appliances are connected in parallel across a.c. mains becauseFFFF..(i)*t is a simple arrangement

(ii) o6er*tion o- e*c$ *66li*nce (ecome+ inde6endent o- t$e ot$er

(iii) appliances have same currents ratings(iv) this arrangement occupies less space

2. ,hen a parallel a.c. circuit contains a number of branches- then it is convenient- to

solve the circuit by

(i) phasor diagram (ii) 6$*+or *lge(r*(iii) e!uivalent impedance method


3). he power taken by the circuit shown in >ig. 1".1 isFFFFF.

(i) '$ , (ii) 12%" W(iii) 12$$, (iv) none of the above

>ig 1".1

').he active component of line current in >ig. 1".1 isFFF..

(i) /A(ii)'A (iii) &3A (iv) none of the above

&). he power factor of the circuit shomn >ig. 1".1 isFFFFF.

(i) ".>"> l*gging(ii) $.& lagging (iii) $."" lagging (iv) none of the above

"). he total line current drawn by the circuit shown in >ig 1".1 isFFFFFF

(i) + 2 A (ii) 1"A (iii) / 2 A(iv) none of the above

0).he power consumed in the circuit shaownin >ig. 1".2 is

(1) '$ , (ii) 2" W(iii) 12$$ , (iv) none of the above

>ig 1".2



54/55


). he active component of line current in >ig 1".2 is

(i) "A (iii) 13A (ii) 3 A (iv) ' A

). he line current drawn by the circuit shown in >ig. 1".2 is

(i) 13A (ii) "A (iii) A(iv) none of the above

1$). he power factor of the circuit shown in >ig. 1".2 isFFFFF.

(i) "./(ii) $.& (iii) $.0$0 (iv) none of the above

11). he impedance of the circuit shown in >ig l".2 isFFFFF

(i) 1$ ohms (ii) 2' ohms (iii) '/ o$m+(iv) none of the above

12). he circuit shown in >ig 1".2 isFFFFF.(i) resistive (ii) capacitive (iii) ind)cti7e(iv) in resonance

13). *f in >ig. 1".2- P?is made e!ual to Pthen line current will beFF.

(i) *$A (ii) "A (iii) ' A(iv) none of the above

1'). he power consumed in the circuit shown in >ig 1".3 is(1) '$$ , (ii) 3"$$ , (iii) '$$$ , (iv) none o- t$e *(o7e

>ig 1".3

1&). *f the circuit shown in >ig. 1".3 is connected to 12$ d.c.- the current drawn by thecircuit isFFFF..

(i) 2' A (ii) 0$ A (iii) ' A (iv) 3" A

1"). he circuit shown in >ig. 1".3 isFFFF.(i) c*6*citi7e(ii) inductive (iii) resistive (iv) in resonance

10). *f the source fre!uency in >ig. 1".' is low- then

(i) coil t*,e+ * $ig$ l*gging c)rrent(ii) coil takes a low lagging current

(iii) capacitor takes a high leading current (iv) circuit offers high impedance

SIET, Tumkur &' Dept. ofEEE


55/55


1).*f the source fre!uency in >ig. 1".' is high- then

(i) coil takes a high lagging current (ii) c*6*citor t*,e+ * $ig$ le*ding c)rrent

(iii) capacitor takes a low leading current (iv) circuit offers high impedance

>ig 1".'

1).he circuit shown in >ig. 1".' will be in resonance when

(i) P?J P(ii) *1J *2(iii) F *nd I *re in 6$*+e


2$). he circuit shown in >ig 1".& is resistive capacitive(i) in resonance (ii) resistive

(iii) inductive (iv) c*6*citi7e

>ig 1".&

21. he circuit shown in >ig. 1".& will consume a power of

(i) 1%""W(ii) 2'$$, (iii) &$$ , (iv) none of the above

22. *f the admittance of a parallel a.c. circuit is increased- the circuit currentFF.

(i) remains constant (ii) is decreased (iii) i+ incre*+ed(iv) none of the above

part a basic ee objectives.doc

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