BTEC-EEE-03 - pdfMachine from Broadgun Software, http ... · 2 (DEE 311) WS18 Or 3. (a) What are...

(DEE 311)

B.Tech. DEGREE EXAMINATION, MAY 2009.

(Examination at the end of Third Year)

Electricals and Electronics

Paper I � LINEAR CONTROL SYSTEMS

Time : Three hours Maximum : 75 marks

Answer Question No. 1 compulsory.

Answer ONE question from each Unit.

All questions carry equal marks.

1. (a) What is a system?

(b) What is a open loop system?

(c) What is a time varying system?

(d) Draw the basic waveform of a step signal.

(e) What are poles of a system?

(f) Define Bandwidth.

(g) What is low pass filter?

(h) What are co-ordinate axes for root locus?

(i) What is eBod (Magnitude Plot)?

(j) What is the use of lead compensator?

(k) Define state of a system.

(l) Write state model of a system.

(m) What are Eigen values?

(n) What is the use of Nyquist plot?

UNIT I

2. (a) What are the advantages of closed loop system?

(b) Write the differential equations for the system given below :

id454859 pdfMachine by Broadgun Software - a great PDF writer! - a great PDF creator! - http://www.pdfmachine.com http://www.broadgun.com

(DEE 311) 2

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Or

3. (a) What are the advantages of transfer function representation?

(b) Obtain transfer function.

UNIT II

4. (a) Draw the time response characteristic of a typical 2nd order system and

denote salient points on it.

(b) Find the transfer function of a second order system with peak time pt of 12/

sec. and a maximum overshoot P of 0.095.

Or

5. Check the stability of the following systems with characteristic equation gives as

(a) 01818112 234 ssss

(b) 010522234

ssss

UNIT III

6. Draw Root locus of the system whose forward path transfer function is

)4()3()(

ss

KsG and comment on stability.

Or

7. Draw eBod plot for the system

)40()10(

)2(800)(

2

sss

ssG

UNIT IV

8. (a) Explain the effect of lag compensation on system's response.

(b) What are the properties of state transition matrix?

Or

9. (a) If

10

10A find the state transition matrix.

(b) Explain the term controllability.

(DEE 311) 3

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(DEE 312)




Paper II � Electronic Circuits � II


Answer Question No. 1 Compulsorily.

(1 15 = 15)


(4 15 = 60)

10. (a) Define second Harmonic distortion.

(b) State Barkhausen criteria for oscillations.

(c) What are the desirable characteristics of practical current amplifier?

(d) The overall gain in Negative feed back is

(e) What are advantages of Negative feed back?

(f) In class C amplifier, where the Q point is fixed.

(g) The maximum theoritical efficiency of class B push pull Amplifier is

(h) What is the conversion efficiency?

(i) Compare all three types of multivibrators.

(j) What is the effect of capacitor in multivibrator?

(k) Define stable state and quasi stable state in multivibrator.

(l) What are the advantages of SMPS?

(m) Draw the circuit diagram for colpitt�s oscillator.

(n) Draw the ckt diagram for double tuned amplifier.

(o) What do you mean by restoration time?

UNIT I

11. (a) In a class A amplifier circuit VCE MAX = 25V, VCE MIN = 5V. Find the overall

efficiency for series fed load.

(b) Discuss why single ended power amplifier is not used in practical circuits.

(DEE 311) 4

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Or

12. (a) Show that class B push pull amplifier exhibits half wave symmetry.

(b) What causes crossover distortion, explain?

UNIT II

13. (a) What is the condition for stability and explain its significance with respect to

feed back amplifier?

(b) Write briefly about tuned oscillator.

Or

14. (a) With the help of necessary equations, discuss the variations of

OIIV RRAA ,,, , with SR and LR without SR and LR in CE configuration.

(b) Write applications of negative feed back.

UNIT III

15. (a) Give detailed description of the working of Bistable Multivibrator.

(b) Explain the operation of push pull amplifier.

Or

16. (a) Explain the operation of class C power amplifier.

(b) Give the comparative study of Astable, Bistable and Monostable

Multivibrators.

UNIT IV

17. (a) Draw the circuit for series type and shunt type voltage regulators and

explain in brief.

(b) What is the function of pre-regulator circuit?

Or

18. (a) With neat sketch explain the operation SMPS.

(b) What is UPS, explain how it differs from regulated power supply?

��

(DEE 313)




(DEE 311) 5

WS18

Paper III � GENERATION OF ELECTRICAL POWER


Answer Question No. 1 compulsorily.



19. (a) Define base load.

(b) What is load duration curve?

(c) What is the purpose of boiler in a thermal station?

(d) Define overall efficiency of steam station.

(e) What is hydrograph?

(f) What is penstock?

(g) Define AMU.

(h) What is the purpose of Coolent in nuclear stations?

(i) List two applications of gas turbine plants.

(j) Define plant capacity factor.

(k) What do you mean by fixed charges?

(l) What are the causes of low power factor?

(m) What is meant by pulverised fuels?

(n) What is extra terrestrial radiation?

UNIT I

20. With neat schematic layout, explain the working of a coal fired power station.

Or

21. (a) Discuss different factors effecting size of generator units.

(b) Explain the working of a steam prime mover.

UNIT II

22. Briefly discuss the layout and working of hydro electric plant.

Or

23. Describe the working of pressurised water reactor. What are its merits and

demerits?

UNIT III

24. (a) Explain open cycle and closed cycle gas turbine plants.

(b) Write a brief note on fuel cells.

(DEE 311) 6

WS18

Or

25. (a) Explain the constructions and working of a Solar pond.

(b) Explain the principles of energy extraction from wind power plants.

UNIT IV

26. Derive an expression for most economical PF for constant kw and constant kVA

type loads.

Or

27. (a) Explain various methods of improving PF.

(b) Briefly discuss different types of tariffs.

��

(DEE 314)



Electricals And Electronics

Paper IV � ELECTRICAL MEASUREMENTS




28. (a) Give an example for �Integrating type instruments�.

(b) What do you mean by �Ratio error in CT�?

(c) What is meter constant of an energy meter?

(d) How to extent the range of a given ammeter?

(e) Name the transducer used for weight.

(f) Why PMMC instruments are not suitable for a.c. measurements?

(g) What is thermo-couple?

(h) Show the circuit for measuring total reactive power in a 3-phase circuit

using single watt-meter.

(i) What is thermister?

(j) What is the purpose of Anderson's Bridge?

(DEE 311) 7

WS18

(k) What is the purpose of Weins Bridge?

(l) What is the purpose of Campbell's Bridge?

(m) What is the use of Scherings Bridge?

(n) What is the principle of flux meter?

(o) What is the basic operation of oscilloscope.

UNIT I

29. (a) Explain the principle of operation of synchroscope.

(b) Explain the principle of operation and construction of attraction type M.I.

instrument.

Or

30. How to measure reactive power in single-phase and three-phase circuits?

UNIT II

31. (a) What is the purpose of potential transformer and explain the principle of

operation?

(b) Explain the operation of Andersons Bridge.

Or

32. (a) What is the purpose of current transformer and explain the principle of

operation?

(b) Explain the operation of Heauisides Bridge.

UNIT III

33. In a test on a specimen of total weight 15 kg the measured values of iron loss at a

given value of flux density were 17.5 watts at 40 Hz and 29.9 watts at 60 Hz. Estimate

the values of histerisis and eddy current losses at 50 Hz for the same value of peak flux

density.

Or

34. Explain the operation of Ballastic galvanometer. How to calibrate it?

UNIT IV

35. Explain the construction of CRO with neat sketches.

Or

36. (a) Explain the operation of DVM.

(b) Explain the operation of LVDT and Thermister.

��

(DEE 315)

(DEE 311) 8

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Paper V � TRANSMISSION AND DISTRIBUTION


Answer ALL questions.


Question No. 1 is compulsory.


37. (a) What are the factors affecting skin effect?

(b) Write the expression of capacitance to neutral.

(c) What is the effect of conductor diameter on inductance of line?

(d) What do you mean by medium lines?

(e) What is the transmission efficiency of short transmission lines?

(f) Define nominal-T network.

(g) Define surge impedance.

(h) What is meant by corona?

(i) Define stringing charts.

(j) How can you reduce the vibration of conductors?

(k) How is the distribution systems classified?

(l) What is the use of rod gaps?

(m) Define string efficiency.

(n) What is meant by grading of cables?

UNIT I

38. (a) Discuss GMD and GMR of a transmission line.

(b) Calculate the inductance a conductor of a three-phase system. Which has a

1.8 cm diameter and conductors are placed at the corner of the equilateral triangle of

sides 3.5 m.

Or

39. (a) What do you mean by transposition of lines? What are its effects on the

performance of the line?

(b) Derive an expression for capacitance of a three phase transmission line with

unequal spacing assuming uniform transposition.

(DEE 311) 9

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UNIT II

40. (a) Classify the transmission lines based on line length and operating voltages.

(b) What is Ferranti effect? Deduce an expression for voltage rise of an unloaded

line.

Or

41. (a) Derive an expression for sag and tension when the supports are at unequal

heights.

(b) Describe the phenomenon of Corona. Explain the factors affecting corona.

UNIT III

42. (a) Explain the following � feeder, distributor and service mains.

(b) Derive an expression for the voltage drop of a two-wire DC distribution

system with a uniformly distributed load fed at one end.

Or

43. (a) Briefly discuss the classification of substations.

(b) Briefly discuss the equipments of substations.

UNIT IV

44. (a) Derive an expression for voltage distribution over a string of suspension

insulators.

(b) Write a short note on insulator failure.

Or

45. (a) Explain the constructional parts of cables.

(b) Derive an expression for capacitance of a single-core cable.

��

(DEE 316)




Paper VI � ELECTRO MECHANICS � III

(DEE 311) 10

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46. (a) What is salient pole synchronous machine?

(b) What is distribution factor?

(c) What could be the prime movers for a non-salient pole synchronous

generator?

(d) What is dynamically induced emf?

(e) What is the stationary part in synchronous machine?

(f) What is the nature of armature reaction under lagging p.f. loads?

(g) What is an infinite Bus Bar?

(h) Draw the sketch of a �V� curve; Where the x and y axis?

(i) What is a synchronous condencer?

(j) How the direction of rotation of a synchronous motor be reversed?

(k) Mention the specific application of a synchronous motor.

(l) Draw the load characteristics of a A.C. series Motor.

(m) What is the advantage of stepper Motor

(n) What is the specific application of Linear Induction motor?

UNIT I

47. (a) Derive the e.m.f. equation of a synchronous generator.

(b) A 3-ph; 10 pole; Y�connected alternator runs at 600 rpm. If has 120 slots as

stator with 8 conductors per slot and the conductors of each phase are connected in

series. Determine the phase and line emfs if flux per pole in 56 Mwb. Assume full pitch

coils.

Or

48. (a) Briefly explain emf method of determining the regulation of an alternator.

(b) If the field excitation of 10A in an alternator gives a current of 150 A on

short-circuit and a terminal voltage of 900 V an open circuit. Find the interval voltage

drop with a load current of 60 A.

UNIT II

49. (a) Explain the vector diagram of a salient pole synchronous machine.

(b) Derive an expression for the synchroning power when an alternate is

synchronized with an infinite busbar.

Or

(DEE 311) 11

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50. Briefly explain the effect of change in excitation on the distribution of load of two

parallel connected alternator.

UNIT III

51. (a) Briefly explain why synchronous motor is not self starting.

(b) Draw vector diagram of synchronous motor operating as lagging p.f. and

leading p.f.

Or

52. (a) Explain the effect of excitation on the armature current of a synchronous

motor.

(b) A 3 phase, 400 V synchronous motor takes 52.5 A at a p.f. of 0.8 leading.

Calculate the power supplied and the induced emf. The motor impedance per phase is

(0.25 + j 3.2) ohms

UNIT IV

53. (a) Explain the operation of a Stepper Motor.

(b) Justify the applications of linear induction motor with its principle of

operation.

Or

54. (a) Distinguish between DC series motor and A.C. series motor.

(b) Give the constructional details of Hysteresis motor.

��

(DEE 321)



ELECTRICALS AND ELECTRONICS

Paper I � LINEAR IC�S AND APPLICATIONS


Answer question No. 1 compulsorily.

(1 15 = 15)

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


55. (a) Define input off set current.

(b) What is output equation of an ideal op-amp?

(DEE 311) 12

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(c) Draw the circuit diagram, for voltage follower.

(d) Draw the equivalent circuit of op-amp.

(e) Define large signal voltage gain in an op-amp.

(f) What is the need of a compensation circuit?

(g) Draw ideal voltage transfer curve.

(h) Define upper threshold voltage in a Schmitt trigger.

(i) Write the applications of 555 astable multi.

(j) Draw hystensis voltage graph of Schmitt trigger.

(k) Define lock range.

(l) What are the advantages of active filters?

(m) What is a window detector?

(n) Define notch filter.

(o) Define capture range.

UNIT I

56. (a) Explain the block diagram of operational amplifier.

(b) Explain the negative feed back concept in op-amp.

Or

57. (a) Explain band width limitations and slew rate of op-amp.

(b) Explain the following and find their output equation :

(i) Summing amplifier.

(ii) Differential amplifier.

UNIT II

58. (a) With neat sketch explain RC phase shift oscillator.

(b) Explain square wave generator.

Or

59. (a) Describe Schmitt trigger an its response.

(b) Explain basic comparator circuit.

UNIT III

60. (a) Explain positive and negative clippors with one example each.

(b) Describe sample and hold ckt.

Or

61. (a) Explain peack detector.

(b) Draw the circuit diagram of successive approximation A/D converters.

(DEE 311) 13

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UNIT IV

62. (a) Explain the basic block diagram of 555 timer.

(b) Draw and explain the output response of high pass filter.

Or

63. (a) Explain phased locked loops.

(b) Explain LPF using op-amp.

��

(DEE 322)




Paper II � MICROPROCESSORS AND INTERFACING



Q. No. 1 is compulsory.



64. (a) Explain the functions of

(i) DAA

(ii) XLAT.

(b) What is addressing mode?

(c) What are the modes of operation of 8255?

(d) What is the use of a modem?

(e) What is virtual memory?

(f) What is a bus cycle?

(g) What is maximum mode operation of 8086?

(h) What is the need of a co-processor?

(i) What are the control flags of 8086?

(j) What is meant by pipe lined architecture?

(k) What is the function of following signals of 8086

(i) BHE

(ii) IO/M.

(l) List the interrupt priorities of 8086.

(DEE 311) 14

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(m) What is the purpose of 8279?

(n) What is the purpose of 8251?

UNIT I

65. (a) Describe the different instruction formats of 8086.

(b) Explain conditional and control flags of 8086.

Or

66. (a) Explain the internal architecture of 8086.

(b) What are assembler directives?

UNIT II

67. (a) What do you mean by interrupt priorities? List out the interrupt priorities of

8086.

(b) Bring out the difference between macro and procedure.

Or

68. (a) Explain briefly the instructions used to handle look up tables in 8086.

(b) How does 8086 identifies between 8 bit and 16 bit operations?

UNIT III

69. (a) Explain interfacing of a keyboard and microprocessor.

(b) Draw and explain a circuit for interfacing ADC with 8086.

Or

70. (a) Design a microprocessor based stopwatch using 8253 and 8255.

(b) Explain with block diagram 8251.

UNIT IV

71. (a) What are the criteria to be considered before interfacing memory to the

processor?

(b) Draw memory read bus cycle in maximum mode of operation of 8086.

Or

72. (a) Explain the concept and need for interfacing I/O device to a processor using

DMA.

(b) Differentiate I/O mapped and memory mapped I/O interfacing techniques.

(DEE 311) 15

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��

(DEE 323)




Paper III � DIGITAL SIGNAL PROCESSING



Question No. 1 is Compulsory.


73. (a) What are the applications of Digital Signal Processing?

(b) Define the term linearity as applied to a discrete time system.

(c) What is meant by causality?

(d) Give the expression for z � transform.

(e) What are the different types of operations performed on discrete�time signals?

(f) What is aliasing effect?

(g) Find the z � transform of a digital impulse.

(h) When the DFT (k) of a sequence x(n) is imaginary?

(i) What is zero padding?

(j) Distinguish between Fourier series and Fourier Transform.

(k) What is the main advantage of FFT?

(l) Can FFT be used for computing the IDFT or not?

(m) What is warping effect?

(n) What are the advantages of Kaiser window?

UNIT I

74. Determine whether each of the following systems defined below is

(a) Causal

(b) Linear

(c) Time invariant

(d) Stable

(i) |)(|log)( 10 nxny

(ii) )()(

nxeny

.

Or

75. (a) Compute the convolution of the following signals

(DEE 311) 16

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1,1,1,1)(4,5,2,0,1)( nhnx .

(b) Find the z � transform of the sequence

1,3,2,0,1,2,3,1,2)( nx .

UNIT II

76. (a) Obtain the circular convolution of the sequences )(nx and )(nh by using

DFT

2,2,1)( nx and 3,2,1)( nh .

(b) Explain about periodic and circular convolution.

Or

77. Draw the flow graph for an 8 � point DFT using Radix � 2 Decimation in frequency

FFT algorithm. Using this flow graph obtain the DFT of the 8 � point signal

0,0,1,1,1,1,1,1)( nx .

UNIT III

78. Design an analog Butter worth filter that has a �2 dB pass bard attenuation at a

frequency of 20 rad/sec an atleast �10 dB stop band attenuation at 30 rad/sec.

Or

79. (a) What is bilinear transformation and give its properties?

(b) Distinguish between Butter worth and Chebyshev (Type I) filter.

UNIT IV

80. (a) Compare FIR and IIR filters.

(b) What is the condition for the impulse response of FIR filter to satisfy for

constant group and phase delay and for only constant group delay?

Or

81. Write short notes on the following :

(a) Direct and Cascade realizations

(b) Bartlett triangular window

(c) Frequency response of FIR filters.

��

(DEE 324)


(Examination at the end of Third Year Fourth Semester)

(DEE 311) 17

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Paper IV �POWER ELECTRONICS



Question No. 1 is compulsory.



82. (a) What is meant by delay time of an SCR?

(b) What is commutation?

(c) Define UJT and Triac.

(d) Name the method adopted for the protection of SCR against over currents.

(e) What is firing angle?

(f) What is the necessity of free wheeling diode?

(g) What are the applications of dual converters?

(h) Explain the principle of Inverter.

(i) Compare voltage source and current source inverters.

(j) For a chopper Vs in the source voltage, R in the load resistance and as the

duty cycle. Give the expression of rms value of the output voltage.

(k) What is a cyclo converter?

(l) Draw the Gate characteristics of an SCR.

(m) What is the difference between repetitive current and surge current ratings of

a thyristor?

(n) What are the conditions in the choice of frequency for a chopper?

UNIT I

83. (a) Draw static V-I characteristics of SCR and explain its different regions of

operation.

(b) Explain in detail about the protection of SCR�s against overvoltage and

overcurrent.

Or

84. (a) Compare an UJT firing circuit with R and RC firing circuits.

(b) Discuss with relevant waveform, class A and Class D types of commutation

employed for thyristors.

UNIT II

85. (a) A single phase full-wave SCR circuit feeds power to a resistive load. Draw

wave forms for source voltage, load voltage, load current and voltage across the SCR for

a given firing angle . Obtain expression for average and runs load voltages in terms of

source voltage and firing angle.

(b) In a single phase full converter, if the output voltage has peak and average

values of 325 V and 133 V respectively. Find the firing angle.

(DEE 311) 18

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Or

86. (a) With the help of circuit diagram and wave-form explain the working of single

phase dual converters.

(b) Discuss the effect of pulse width modulation for the power factor

improvement.

UNIT III

87. (a) Describe the working of a single phase series inverter with appropriate circuit

and wave forms.

(b) Explain in detail about pulse with modulated inverters.

Or

88. (a) What are the two main types of inverters? Distinguish between them

explicitly.

(b) A single phase full bridge inverter delivers power to RLC load with R =

3 and XL = 12 . The bridge operates with a periodicity of 0.2ms. Calculate the value

of C so that load commutation is achieved for the thyristors. Turn-off time of thyristors

in 12 s. Factor of safety is 2. Assume the load current to contain only the fundamental

component.

UNIT IV

89. (a) Explain the speed control of dc motors using thyristor circuit.

(b) Draw the circuit diagram the explain the operation of Jones chopper. Draw

the relevant waveforms.

Or

90. (a) Explain principle of single phase cycle converter with four thyristors in each

bridge. Draw the output voltage waveform clearly making the region of operation of each

bridge.

(b) Discuss the applications of cycle converter in Industry.

��

(DEE 325)




Paper V � UTILIZATION OF ELECTRICAL POWER



(DEE 311) 19

WS18

Q. No. 1 is compulsory.


91. (a) What do you mean by braking?

(b) What is heat time curve?

(c) What do you mean by load equalization?

(d) What is electric drive?

(e) What is hybrid drive?

(f) Why d.c. series motors are preferred traction work?

(g) Define specific energy consumption.

(h) Define tractive effect.

(i) List the advantages of electric heating.

(j) What are the applications of induction heating?

(k) What is arc atom welding?

(l) Define luminous flux.

(m) Define solid angle.

(n) What is MSCP?

92. (a) Explain various methods of speed control of series motor. Which method is

more effective in reducing the speed for given torque?

(b) A d.c. series motor is braked by employing rheostatic braking against a load

torque of 312.5 N-M. It is required to limit the speed to 500 rpm during braking.

Estimate the value of resistance to be connected in the motor circuit. The total

resistance of the armature and field is 1 ohm and the magnetisation curve at 600 rpm is

given below :

I (amp) : 20 40 60 80 100

E (volts) : 174 360 492 588 630

Or

93. (a) What are different classifications of load and how they affect the motor

selection? What is the main requirement to accelerate the load of high moment of

inertia?

(b) Discuss various modes of dissipation of heat.

94. (a) Explain various current collecting systems.

(b) Compare ac and dc systems of traction.

Or

95. (a) Explain various types of electric braking of traction drives.

(DEE 311) 20

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(b) A 200 tonne motor coach having 4 motors, each developing 6000 N-M torque

during acceleration, starts from rest. If up gradient is 30 in 1000, gear ratio 4, gear

transmission efficiency 90%, wheel radius 45 cm, train resistance 50 N/tonne, addition

of rotational inertia 10%, calculate the time taken to attain a speed of 50 kmph.

96. (a) Discuss various heating methods. What are the advantages of electric heating?

(b) Explain the working of an induction furnace.

Or

97. (a) What is welding and what are the qualities of good weld?

(b) Explain the characteristics of carbon arc welding.

98. (a) What are the main faults of lighting system and how these are overcome?

(b) Explain with a sketch, the principle of working of sodium vapour lamp and

enumerate its advantages and disadvantages as a source of light.

Or

99. (a) Explain the different types of outdoor flood lighting installations.

(b) Estimate the size of the lamp to be used in a 40 beam projector to produce

illumination of 5 lux on building of 50 m away. Assume waste light factor 1.2 and only

50% light of lamp is available in the beam.

��

(DEE 326)




Paper VI � SWITCH GEAR AND PROTECTION



Question No. 1 is Compulsory.


100. (a) What is a relay?

(b) Define restraining force of a relay.

(DEE 311) 21

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(c) Define PSM.

(d) What is primary zone of protection?

(e) What is meant by arc?

(f) Define restraiking voltage.

(g) Define breaking capacity of circuit breaker.

(h) List the properties of 6SF gas.

(i) What is biased differential protection of alternators?

(j) What is the advantages of grounding?

(k) What is earth resistance?

(l) What are the basic components of static relays?

(m) Give the characteristics of IDMT relay.

(n) Write Arrytar�s equation of arc.

101. (a) Explain the basic requirements of protective relaying.

(b) Explain the working of induction relays.

Or

102. (a) Explain with neat diagrams, a system of protection making use of

negative sequence currents for the operation of relays.

(b) Discuss the Universal torque equation of relays.

103. (a) Explain the arc phenomenon. Explain the methods of arc interruption.

(b) Derive an expression for R.R.R.V.

Or

104. (a) Explain the process of current interruption in a typical oil circuit

breaker.

(b) Briefly describe the circuit breaker ratings.

105. (a) Describe with the aid of diagram of connections, the Merz Price Circulating

Current System for protection of transformers.

(b) A 3 � , 33 kV/6.6 kV transformer is connected star/delta and is provided

with differential protection scheme. The C.T.S. on the L.V. Side have ratio of 300/5.

What will be the ratio of CTs on the HV side?

(DEE 311) 22

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Or

106. (a) Explain the working of Peterson Coil. What are the permissible practicle

deviations from resonance in the tuning of Peterson Coil?

(b) Explain the working of Translay relay for the feeder protection.

107. (a) What are the advantages of static relays over electro magnetic relays?

(b) Explain the working of basic components of static relays.

Or

108. (a) Explain the working of static directional relay.

(b) Explain the working of static differential relay.

��

BTEC-EEE-03 - pdfMachine from Broadgun Software, http ... · 2 (DEE 311) WS18 Or 3. (a) What are...

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