b.tech. degree examination, dec. - 2013 (examination at the … · 2014-08-21 · 4) a) draw the...

(DEE 31)

B.Tech. DEGREE EXAMINATION, DEC. - 2013

(Examination at the end of Third Year Third Semester)

Electricals and Electronics

Paper - I : LINEAR CONTROL SYSTEMS

Time : 3 Hours Maximum Marks : 75

Answer Question no.I Compulsory 15 × 1 = 15

Answer ONE question from each unit 4 × 15 = 60

1) a) What is feedback?

b) What is multivariable system?

c) What is regulator?

d) Define the terms of source and sink.

e) What is rise time?

f) What are the advantages of routh’s criterion?

g) What is lag compensator?

h) Define the terms of state vector and state variable.

i) What are the advantages of nyquist method?

j) What are the effects of lead compensation?

k) What is settling time?

l) What is asymptotic stability?

m) What are the advantages of frequency domain response?

n) What is phase margin?

o) What are the advantages of phase variable?

UNIT – I

2) Determine the transfer function C(S)/R(S) of the system shown below fig. by block diagram

reduction method. (15)

(OR)

3) For the signal flow graph shown below fig., find the overall gain. (15)

UNIT – II 4) By means of routh criterion, determine the stability of the system represented by the

characteristic equation s4+s3+2s2+2s+5 = 0. Comment on the location of the roots of the

characteristic equation. (15)

(OR)

5) a) Derive the expressions for peak time and settling time of standard 2nd order system

when subjected to a unit step input. (8)

b) The open-loop transfer function of a unity feedback system is G(s) = 50/S2(S+2). If

the input is r(t) = t2+5t+3, find the steady-state error. (7)

UNIT – III

6) The open loop transfer function,G(s)H(S) = 200(s+1)/s(s+10)2. Find the zero-dB frequency

and phase angle at this frequency. What is the phase margin? Comment on the stability of

the system. (15)

(OR)

7) The open loop transfer function of a unity feedback system is

G(S)=(1+4S)/S2(1+S)(1+2S).

i) Using Nyquist criterion, determine whether the closed loop system is stable, or not.

ii) Does the polar plot of the open loop transfer function cross the real axis? If so find the

frequency at which it crosses? (15)

UNIT – IV

8) a) Write short notes on controllability and observability. (8)

b) Explain the concept of

i) State ii) State variables iii) State model. (7)

(OR)

9) What do you understand by ‘state transition matrix’? State and prove its properties. (15)

��

(DEE312)

B.Tech. DEGREE EXAMINATION, DEC 2013

(Examination at the end of Third Year Third Semester)


Paper - II : ELECTRONIC CIRCUITS - II


Answer question no.1 compulsory

Answer ONE question for each unit

1) a) What are the applications of power amplifier ? 2

b) What are the applications of astable multivibrators? 1

c) What are the advantages of switch mode power supplies? 1

d) What is the characteristic feature of a tuned circuit? 1

e) What is stagger tuned Amplifier? 2

f) Define loop gain. 1

g) Define feedback factor ''. 1

h) Why LC oscillators are not suitable? 1

i) What is Barkhausen criterion? 2

j) What is meant by Thermal Protection? 1

k) Define the term 'current charging'. 2

UNIT-I (4×15= 60)

2) a) Explain why a power amplifier is also known as a large-signal amplifier.

b) Draw the circuit of a class A large signal amplifier and explain its operation.

(OR)

3) a) Discuss the temperature effect on the function of power amplifier.

b) Prove that the maximum efficiency of class B amplifier is 78.5%.

UNIT-II

4) a) Draw the circuit diagram of voltage series feedback and derive expression for voltage gain.

b) Explain the working of RC phase shift oscillator with circuit diagram.

(OR)

5) a) With the help of general block diagram explain the term feedback.

b) Explain the operation Wein bridge oscillator with help of neat diagram.

UNIT-III

6) a) Draw and explain the circuit of double tuned Amplifier with the help of frequency response.

b) Explain the operation of Schmitt trigger with help of diagram. Draw its characteristics.

(OR)

7) a) What is narrow bend neutralization? Explain.

b) Write short notes on Bistable multivibrator?

UNIT-IV

8) a) Explain about load and line regulation.

b) Draw and explain transistorized can start current sweep generation circuit.

(OR)

9) a) Explain the operation of voltage sweep circuits.

b) Explain the series and shunt voltage regulators.

* * * *

(DEE 313)


(Examination at the end of Third Year) (Semester-III)

ELECTRICALS AND ELECTRONICS

Paper - III : Generation of Electrical Power


Answer Question No. 1 compulsory. [15 x 1 = 15]

Answer any ONE question from each unit. [4 x 15 = 60]

1) a) What is the use of Economiser?

b) What are the main sources of energy?

c) What is the main function of Cooling Tower?

d) What is meant by pulverization?

e) List out types of turbines.

f) What is the need of Shielding?

g) Define Surge tank.

h) What is the use of penstock?

i) What is fuel cell?

j) What are the types of wind blades?

k) Explain Solar cell.

l) Define Compressor Efficiency.

m) Define plant use factor.

n) What do you understand by load curve?

o) What is meant by peak load of power station?

Unit-I

2) a) What are the factors that effecting the choice of site for Thermal Power Plant. [8]

b) Discuss various factor which effects the cost of generation. [7]

OR

3) Describe the Schematic arrangement of a Thermal power station and explain the

function of each briefly. [15]

Unit-II

4) a) What are the functions of moderator and control rods in a nuclear reactor. [5]

b) With the help of a neat diagram, explain working principle of a fast breeder reactor. [10]

OR

5) Explain the following: [15]

i) Hydro graphs.

ii) Mass curve.

iii) Governing of turbines.

Unit-III

6) a) Explain the role of Solar Energy in brief. [5]

b) With a neat diagram, explain the operation of open cycle gas turbine power

plant. [10]

OR

7) a) Explain the working of Horizontal axis wind mill with neat sketch.[10]

b) Discuss the applications of gas turbine power plant. [5]

Unit-IV

8) Explain the following types of Tariff’s: [15]

i) Flate rate ii) Two part

iii) Three-part iv) Block rate

v) Power factor tariff

OR

9) a) What are the reasons for low power factor. [5]

b) Explain the methods of improving power factor. [10]

● ● ● ● ●

(DEE314)

B.Tech. DEGREE EXAMINATION, DEC - 2013

(Examination at the end of Third Year)


Paper - IV : ELECTRICAL MEASUREMENTS

Time : Three hours Maximum : 75 marks

Answer Question No. 1 compulsory. (15x1=15)

Answer ONE question from each unit. (4x15=60)

1) a) Define Thermister

b) What is meant by Permeability ?

c) What are the different methods for measuring iron losses ?

d) Write any two advantages of LVDT

e) Define Transformation ratio

f) Classify the resistance from measurement point of view

g) Define dissipation factor

h) Give the classifications of DVM's

i) Write the applications of CRO

j) Define Precission

k) Define magnetic flux density

l) What is meant by creeping ?

m) Define B.H. loop

n) Define ratio correction factor

o) Define Burden

UNIT - I

2) a) Explain construction and working of PMMC instrument (8)

b) Explain the different methods of producing controlling torque in an analog instrument.

(7)

(Or)

3) Explain the constructional details and working principle of low power factor Electrodynamo

Meter type wattmeter. How it can be made to read d.c as well as A.c. (15)

UNIT - II

4) a) Draw the circuit diagram of a Kelvin's double bridge and Derive the condition for

Balance. (10)

b) Draw the phasor diagram of potential transfer. (5)

(Or)

5) a) Explain in detail the effect of opening the secondary circuit of a C.T. when the

primary winding is Energized. (5)

b) Draw the circuit diagram of Maxwell's Inductance Capacitance Bridge and mention

the advantages & disadvantages. (10)

UNIT - III

6) a) Derive an expression for Equation of motion of ballistic galvanometer. (10)

b) Explain step by step method for measurement of B-H curve of a magnetic substance.(5)

(Or)

7) Prove that the change in value of flux is directly proportional to the change in the deflection

in case of flux meter. (15)

UNIT - IV

8) a) Draw and Explain Cathode ray oscilloscope. (10)

b) Explain the advantages of digital meter over analog meters. (5)

(Or)

9) Write a short notes on the following : (5x3=15)

a) LVDT

b) Strain guage

c) LCD

d) DVM

e) Applications of CRO.

* * *

(DEE315 )


(Examination at the end of Third Year Third semester)


Paper - V : TRANSMISSION & DISTRIBUTION


Answer Question No.1 is compulsory (15)

Answer one question from each Uni (4x15=60)

1) a) Define Ferrenti Effect

b) What is meant by Sag?

c) Define corona.

d) What is meant by surge impedance loading.

e) Define Insulator.

f) Explain Transposition of conductors.

g) What is meant by double line circuit.

h) List out the advantages of bundled conductors.

i) Define GMD and GMR.

j) State the function of lighting Arresters?

k) Limitations of kelvin’s law.

l) Advantages of three phase line.

m) Various methods of earthing in Substation.

n) Define string efficiency.

o) Define the term feeder and service mains.

Unit -I

2) a) Derive the expression for Inductance of Double circuit 3-φ system.

b) What are the effects of ground on Inductance?

OR 3) a) Derive the expression for inductance and capacitance of 1- φ system.

b) What are the advantages of bundled conductors?

Unit -II

4) a) Explain the classification of lines based on their length of transmission.

b) What are the methods reducing corona and list the advantages and

disadvantages.

OR

5) a) Explain the effect of wind and ice on sag.

b) List the advantages and disadvantages of corona.

c) List the transmission lines based on length.

Unit –III

6) a) Derive the expression for the power loss in a uniformly loaded distributor

Fed at both ends.

b) State kelvins law and its limitations.

OR 7) a) Draw different types of substations and layout, locate all the protecting

equipments.

b) Explain briefly the various types of bus bars arrangement in a substation.

Unit -IV

8) a) List and explain different types of Insulations.

b) Determine string efficiency and explain the capacitance grading and

capacitance of three core belted cables.

OR

9) a) Explain insulation resistance of a cable.

b) A 66kv, concentric cable with two inter-sheaths has a core diameter 1.8 cm.

Dielectric material 3.5cm thick constitutes the three terms of insulation.

Determine the maximum stress in each of the three layens if 20kv is

maintained across each of the inner two.

� � �

(DEE 316)

B.Tech. DEGREE EXAMINATION, DEC. 2013

(Examination at the end of Third Year)(Third Semester)


Paper – VI : ELECTRO MECHANICS - III


Answer Question No.1 compulsory

Answer One question from each Unit

[15 x 1 = 15]

[4 x 15 = 60]

1) a) What happens to the value of synchronous reactance if air gap is increased ?

b) Draw the equivalent circuit of an alternator ?

c) Explain the terms ‘single layer’, ‘distributed’ related to ac armature

windings?

d) What are even and odd harmonics ?

e) What type of alternators will be used for i) hydraulic turbines ii) Steam

turbines ?

f) What is the meaning of ‘electrical angle’? How is it different from

‘Mechanical angle’?

g) Why slip test is conducted on synchronous machine ?

h) What is synchronizing power coefficient ?

i) Define breadth factor.

j) Give the applications of Universal motor ?

k) Draw the phasor diagram of a salient pole alternator when it supplies lagging

p.f. load.

l) What are fractional slot windings ?

m) What is meant by ‘voltage regulation’ ?

n) What is a power circle ?

o) List the advantages of stepper motors ?

UNIT – I

2) a) Explain MMF method of calculating voltage regulation of an alternator ?

b) A 3-Ф, 2 pole, 50Hz, 2300V synchronous machine has 42 slots, each slot has

2 conductors in a double layer winding. The coil pitch is 17 slots. Each phase

winding has 2 parallel paths. Calculate the flux per pole required to generate

a phase voltage of 2300/√3V.

OR

3) a) What is Armature reaction ? Explain the effect of Armature reaction on the

terminal voltage of an alternator at i) unity power factor load and ii) zero

lagging power factor loads ?

b) Derive an expression for the EMF equation of an alternator ?

UNIT – II

4) a) Explain the two reaction theory of a salient pole alternator ?

b) What is synchronization ? How it is done ? Give the necessary conditions for synchronization.

OR

5) a) Why parallel operation is needed ? What is synchronizing power ? Explain

load sharing ?

b) Explain the calculation of regulation of salient pole machines ?

UNIT – III

6) a) What is synchronous condenser ? Explain its operation ?

b) Explain the variation of current and power factor with excitation ?

OR

7) a) What is damper winding ? What is the function of it ? Where it is located ?

b) Explain the starting methods of synchronous motor ?

UNIT – IV

8) a) Explain the operation and characteristics of universal motor ?

b) Explain the operation of variable reluctance stepper motor and give its

applications ?

OR 9) Write short notes on

a) Repulsion motor

b) Linear induction motor

c) Reluctance motor

��

(DEE321)

B. Tech. DEGREE EXAMINATION, DEC. - 2013

(Examination at the end of Third Year Fourth Semester)


Paper - I : LINEAR IC’s & APPLICATIONS


Answer Question No. 1 compulsorily. (15)

Answer ONE question from each unit. (4×15 = 60)

1) a) Draw the Block diagram of operational amplifier.

b) Define CMRR.

c) What are the Bandwidth limitations?

d) Write the applications of OP-AMP.

e) What is the Oscillator principle?

f) What are the different types of oscillators?

g) What are the comparator characteristics?

h) Define frequency stability.

i) What is window detector?

j) Compare between clipper & clamper.

k) What is Peak detector?

l) Draw the 555 IC.

m) Define voltage regulators.

n) What do you mean by Active LP?

o) Explain the Band Stop filters. UNIT- I

2) Explain the following: a) The summing op-amp. b) Frequency compensation and stability.

OR 3) Draw the circuit diagram of Op-Amp differentiator, integrator and derive an

expression for the output in terms of input.

UNIT- II

4) a) Explain the principle of working of the Phase shift oscillator circuit.

b) Explain the principle of working of the Square wave generator.

OR

5) a) Explain about the limitations of OP-AMP as comparators.

b) Write short notes on Schmitt trigger.

UNIT- III

6) Write short notes on the following:

a) Sample and Hold Circuit.

b) Positive and negative clampers.

OR

7) a) Explain the R-2R ladder type DAC.

b) Write short notes on Dual slope converters.

UNIT - IV 8) a) Explain the working principle of Phase locked loops.

b) Design µA 723 Voltage regulator.

OR

9) Write short notes on the following:

a) All pass filters.

b) Sallen Key LP and HP filters.

� � �

(DEE 322)

B.Tech. DEGREE EXAMINATION, DEC. 2013

(Examination at the end of Third Year)(Fourth Semester)


Paper – II : MICROPROCESSORS & INTERFACING


Answer Question No.1 compulsorily

Answer ONE question from each Unit

[15 x 1 = 15]

[4 x 15 = 60]

1) a) What is Microprocessors?

b) Which unit is responsible for performing arithmetic calculations?

c) What does the instruction LEA SI, AX do?

d) What is Assembler directive?

e) Distinguish between a near jump and far jump.

f) What do you mean by interrupt?

g) What is interfacing?

h) Explain the term Interrupt Service Routine.

i) Explain the addressing modes of 8086.

j) What is meant by maximum mode?

k) What is RS-232C?

l) What is meant by handshaking operation?

m) Distinguish between a near and a far call.

n) What is significance of flag register?

o) Differentiate between microprocessor and microcomputer.

UNIT – I

2) a) Draw and explain the internal architecture of 8086.

b) Explain the addressing modes of 8086 briefly.

OR

3) a) Explain the functions of the following signals of 8086:

i) INTR ii) READY iii) RESET

iv) DEN v) TEST vi) NMI

vii) MI/IO viii) HLDA

b) Compare microprocessors and microcomputers.

UNIT – II

4) a) Explain the following instructions:

i) CMP 34H [DI] [BX], DL

ii) XOR AL, AL

iii) ADD CX, [SI]

iv) MOV DS, AX

b) Write a program to add the contents of two words which are in memory and

store the sum in a third address.

OR

5) a) Bring out the differences between the jump and call instructions.

b) Write a program to add two BCD numbers.

UNIT - III

6) a) Explain the interfacing a microprocessor to keyboards.

b) Draw and explain the interfacing diagram of DAC to 8086.

OR

7) a) Explain the concept of interrupts of 8086.

b) Explain the concept of Handshake input/output of 8086 microprocessor.

UNIT – IV

8) a) Explain the maximum mode of operation of 8086.

b) Explain the working functionality of the DMA data transfer.

OR 9) a) Draw and explain the block diagram of 8259.

b) Explain any three modes of operation of 8253/8254.

��

(DEE323)




Paper - III : DIGITAL SIGNAL PROCESSING


Answer Question No.1 compulsory (15 X 1 = 15)

Answer any ONE question from each unit. (4 X 15 = 60)

1) a) What is discrete time system?

b) What is importance of impulse response?

c) State the conditions for stability.

d) Define Transfer function of a system.

e) State the circular time shifting of the DFT.

f) What are the limitations of Energy and Power signals?

g) Express in mathematically Fourier transform of convolution.

h) What is an IIR digital filter?

i) Define stable system.

j) What are advantages of CISC?

k) What is meant by Twiddle factor.

l) What is Time invariant system?

m) What is the necessity of Window?

n) Write expression for cross correlation of periodic signal.

o) State the different types of filters based on frequency response.

UNIT - I

2) a) Check linearity, causality, time invariance & stability.

i) y(n) = x(n2)+x(n-1)

ii) y(n) = nx(n)+x(n-3)

b) Find the Z- Transform and ROC for signal x(n) = anu(n).

OR

3) a) What are the properties of ROC.

b) Find the impulse response for y(n)=x(n)+2x(n-1)-4x(n-2)+x(n-3).

UNIT – II

4) a) Define DFT of a sequence x(n). Obtain the relationship between DFT &

DFS.

b) Distinguish between DFT & DTFT.

OR

5) a) An 8 point sequence is given by x(n)={2,2,2,2,1,1,1,1}. Compute 8 point

DFT of x(n) by radix – 2 DITFFT.

b) Compute the FFT of the sequence x(n)={1,0,0,0,0,0,0,0} using DITFFT.

UNIT - III

6) a) Compare Butterworth and Chebyshev approximation.

b) What is an IIR digital filter? What are the limitations of impulse invariance

method?

OR

7) a) Define stable & unstable systems. Test the condition for stability of the first

order IIR Filter governed by the equation y(n)=x(n)+bx(n-1).

b) Discuss impulse variance method.

UNIT - IV

8) a) Show that an FIR filter is linear phase if

h(n) = h(N-1-n).

b) Design a low pass filter using rectangular window by taking 9 samples of

W(n) and with a cut-off frequency of 1.2 radians/sec.

OR

9) a) What is an FIR filter? Compare FIR filter with an IIR filter?

b) Explain convolution codes with suitable diagram.

��

(DEE 324 )




Paper - IV : POWER ELECTRONICS


Answer Question No.1 compulsory (15)

Answer One question from each unit (4×15=60)

1) a) Write short notes on MOSFET.

b) Discuss briefly about the advantage of freewheeling diode?

c) Discuss the significandce of source inductance?

d) Draw the waveforms of three phase full converter with a α = 30.

e) List out the different Commutation techniques?

f) What is a snubber circuit?

g) What losses occur in a thyristor during working conditions.

h) What is commutation angle or overlap angle?

i) What are the two types of TRC?

j) What is meant by McMurray inverter?

k) Give two advantages of CSI.

l) What are the advantages of PWM control?

m) What is the difference between ON-OFF control and phase control.

n) What is meant by cyclo-converter?

o) What is meant by PWM control in dc chopper?

Unit -I

2) a) Discuss about the Series operation of thyristors?

b) Explain the different turn-on methods of the thyristors?

OR

3) Explain the operation of MOSFET and IGBT?

Unit -II

4) Describe the working of single phase fully controlled bridge converter in the Rectifying mode

and inversion mode. And derive the expressions for average output voltage and rms. output

voltage.

OR

5) Describe the working of three phase half controlled converter for α=30o with

relevant waveforms and derive the expression for average output voltage?

Unit -III

6) Describe the operation of series inverter with aid of diagrams. Describe an

expression for output frequency, current and voltages. What are the

disadvantages of basic series inverter?

OR

7) Explain the operation of 3 phase bridge inverter for 180 degree mode of

operation with aid of relevant phase and line voltage waveforms.

Unit -IV

8) Discuss the working of a single phase midpoint cycloconverter with RL loads and

for discontinuous waveform operation with neat circuit diagram and output rms

voltage and current wave form for fo = fs..

OR

9) Describe the principle of step-up chopper. Derive an expression for the average

output voltage in terms of input dc voltage & duty cycle.

� � �

(DEE325)




Paper - V : UTILIZATION OF ELECTRICAL POWER

Time: 03 Hours Maximum Marks: 75

Answer Question No.1 Compulsory (15 × 1 = 15)

Answer any ONE question from each unit (4 × 15 = 60)

1) a) What is the use of fly wheel?

b) What is meant by electric braking?

c) What is meant by duty cycle?

d) What is meant by load equalization?

e) Define Crest Speed.

f) What is meant by train resistance?

g) Explain term tractive effort.

h) What is meant by Coefficient of adhesion?

i) What is the meaning of Specific Energy Consumption?

j) Give reasons for failure of heating element.

k) Define Stefan’s law.

l) Write about dielectric heating.

m) State the function of choke in fluorescent lamp.

n) Explain luminous efficiency.

o) Define Candela.

UNIT – I

2) a) Comparison between AC drive and DC drive.

b) What is an Electric drive? Classify various types of Electric drives and

discuss their merits and demerits.

OR

3) a) Explain in two paragraphs: Reasons for temperature rise in electrical

machines.

b) What are the factors to be considered while selecting an electric drive for a

particular application?

UNIT - II

4) Describe how plugging, rheostat braking and regenerative braking are employed

with DC motors in Electric traction.

OR

5) a) Derive the Expression for Trapezoidal speed time curve.

b) Calculate the adhesive weight of a locomotive, which accelerates up a

gradient of 1 in 100 at 0.8 kmphps. The self-weight of locomotive is 350

tonnes. Coefficient of adhesion is 0.25. Assume a train resistance of 45 N-

m/Tonne and allow 10% for the effect of rotational inertia.

UNIT – III

6) a) What are the advantages of electric heating.

b) What are the properties of heating element.

OR

7) a) Give the comparison between resistance welding and arc welding.

b) Describe the principle and working of the Ajax-wyatt furnace.

UNIT – IV

8) a) What are the four demerits of gaseous discharge lamp?

b) Explain the principle of operation of Sodium Vapour lamp.

OR

9) a) What are the various factors to be considered in the design of factory

lighting?

b) Explain in detail about flood lighting?

��

(DEE326)

B. Tech. DEGREE EXAMINATION, DEC. - 2013


Electricals & Electronics Engineering

Paper – VI: SWITCH GEAR & PROTECTION


Answer Question No.1 compulsory. (15)

Answer any ONE Question from each Unit. (4X15=60)

1) a) Write any two functions of protective relaying.

b) How does a circuit breaker differ from a switch?

c) Define the term pick up value.

d) Define the term TMS.

e) For what purpose distance relay is used?

f) What is the importance of bus bar protection?

g) What is the meaning of burden on C.T?

h) What type of relay is best suited for generator protection?

i) Why the protection of generators is complex?

j) Define recovery voltage.

k) Define restriking voltage in circuit breakers.

l) Write any two merits of SF6 C.B.

m) What is meant by high resistance interruption in C.B.

n) List the routine tests conducted on circuit breakers.

o) Draw the block diagram of static distance relay.

UNIT - I

2) a) Draw the constructional details of non-directional induction relay. b) Draw and explain the schematic of an impedance relay and its operating

characteristic on R-X diagram.

OR

3) a) Explain the principle of current differential relay with diagrams. b) Explain the working principle and characteristic of reactance relay type

distance relay.

UNIT – II 4) Describe the construction and working of SF6 circuit breaker with multiple

breaks. What are its merits and demerits.

OR

5 a) Explain the term restriking voltage. Derive an expression for the same in

terms of system voltage, inductance and capacitance across a circuit breaker,

when a three phase fault occurs.

b) Explain current chopping in circuit breakers and how it can be minimized.

UNIT – III 6) a) With a neat sketch, explain the differential system of protection applied to

star-delta connected transformers.

b) What are the difficulties experienced in the above method and how are they

overcome?

OR

7) a) Draw and explain the Merz-price protection of alternator stator windings. b) A generator is protected by restricted earth fault protection. The generator

ratings are 13.2kv, 10MVA. The percentage of winding protected against

phase to ground fault is 85%. The relay setting is such that it trips for 20%

out of balance. Calculate the resistance to be added in the neutral to ground

connection.

UNIT – IV

8) a) List the advantages and disadvantages of static relays. b) What is static relay and what is the basis for its development? In what way

has it been successful in replacing the conventional electromagnetic relays?

OR

9) Explain in detail about the simple static over current relay and static directional

over current relay with neat diagrams.

E E EE E EE E EE E E

b.tech. degree examination, dec. - 2013 (examination at the … · 2014-08-21 · 4) a) draw the...

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