1. in hydropower stations an enlarged body of water just above the intake and used to regulate the reservoir is called

Spillways

Forebay

Reservoir

Penstock

2. Which one ,of the following fuels is used by the slow thermal nuclear reactors for power generation?

U235

U238

Th232

Pu239 .

3. When is the Ferranti effect on long overhead lines experienced? .

The line is lightly loaded

The line is heavily loaded

The line is fully loaded .

The power factor is unity

4. The main criterion for selection of the size of a distribution .for a radial distribution system is

Voltage drop .

,Corona loss

Temperature rise

Capital cost

5. <img src='./qimages/3399-5.jpg'>

6.

bundled conductors are mainly used in high voltage overhead transmission lines to:
reduced transmission line losses.

reduce corona

increase mechanical strength of the line.

reduce sag

7. <img src='./qimages/3399-6.jpg'>


8. <img src='./qimages/3399-7.jpg'>

9. The SLG fault current in the faulted phase is 300A, the zero sequence current is:

Zero

300A

100A

66.6A

10. Zero sequence current does not exist in the following fault:

L-G

L-L





11. For a fault in a power system, the term critical clearing time is related to:

Reactive power limit

Transient stability limit

Short circuit current limit

Steady state stability limit

12. Load frequency control is achieved by properly matching the individual machines:

Reactive power

Generated voltages

Turbine inputs

Turbine and generator ratings

13. A power station has installed capacity 300 MW. Its capacity factor is 50% and its load faotor is 75%. Its maximum demand is

100MW

150MW

200MW

250MW

14. Ifthefaultcurrentis3000Aforarelay with a plug selling of 50% and CT ratio of 1000 the plug setting multiplier would be:

1.5

3

4.5

6

15. A negative sequence relay is commonly used to protect:

An alternator

A transformer

A transmission line

Abusbar

16. In thermal plants, the steam energy is converted into energy

Boiler

Condenser.

Reactor

Steam turbine

17. The rotor used in alternators of Hydroelectric Station is

Cylindrical rotor

Salient pole rotor

Non-salient pole rotor

Round rotor with AC excitation

18. The'fuel used in the nuclear power station is:

Uranium

Coal

Diesel oil·

Water

19. Effect of water hammer is reduced by using

Spill ways.

Surge tank

An anvil

Dam

20. In an grid system, the diversity factor ofwhole system:

Decreases

Increases

Remains same

None of the above

21. A uniformly loaded DC distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is: .

One foruth

One third

One half

twice

22. Which Circuit Breaker is preferred for the interruption of high voltage and low current?

Oil

Air blasfCB

Vacuum CB

All of the above

23. Reactance relay, is normally preferred for protection against:

Earth faults

Phase faults .

Open circuit faults

None of the above

24. Which relay is used to detect and protect internal faults of a transformer?

Buchholz relay

Directional relay

Thermal relay

Distance relay

25. The inductance, of a power transmission line Increases with:

Decrease in line length

Increase In diameter of conductor

Increase in spacing between the phase conductors

Increase in load current carried by the conductors

26. Function of Zener diode is to provide to galvano­meter circuit.

Constant voltage

Constant current

Variable voltage,

Variable current

27. Thyristor is a layer junction semic conductor switching device.

3,4

3,3

4,3

4,4

29. A single phase full bridge inverter can operate in load commutation mode· .. in case load consists of

RL

RLC under damped

RLC over damped

I RLC ciritically damped

30. A single phasE'lfulibridge diode rectifier delivers a constant load current of 10A. Average and rms values' of source current are respectively:

5A,10A

10A,10A

5A,5A.

OA,10A (Turnover)

Permanent magnet motor

Differentially compound motor

Cumu!atively compound motor

31. <img src='./qimages/3399-31.jpg'>

32. in single pulse modulation of PWM inverters, third harmonic can be eliminated if pulse width is equal to degress

30

60

120

150

32.

<img src='./qimages/3399-32.jpg'>

33.

<img src='./qimages/3399-33.jpg'>

35. A 3-phase induction motor is operating at slip S. If its two supply leads are interchanged, then its slip at that instant will be:.

2-S

2+S

1+S

1-S

36. Which one of the following capacitors starts split phase induction motor having high value of capacitance?

94 rpm

187 1725 rpm

560 1140 rpm

373 W,1 000 rpm

37. The starting current and torque of a 3-phase induction motor on direct­online starting is 30 A and 300 Nm respectively. What are the corresponding values with star-delta starter?

10A, 100 NM

30A, 300 NM

17.32A, 173.2 NM

30A, 173.3 NM

38. When two alternators are operating in parallel and· at perfect synchronization, their synchronizing power is:

Negative

Positive

Maximum positive

Zero
39. A 3-phase synchronous machine is synchronized with an infinite bus. Now steam input to synchronous machine is iNcreased. With this, synchronous machine starts working as: .

Alternator at leading p. f.

Alternator at lagging p. f.

Synohronous motor at leading p.f.

InductioN generator at lagging p. f.

40. A 480V, 60 Hz 4-pole SYnchronous I motor is draw in 50Aofcurrent at full load and unity p. f. Assume that the motor is lossleSS is. The output torque of the motor eqpals to

220.7 NIVI

160.5 NM

23.11 NM

282.1 NM

41. A EI-pole, 50 Hz, 3-phase synch. mo1;or and an a-pole, 50 Hz, 3-phase slip' ring induction motor are i" meChanically coupled and operate I on the same 3-phase, 50 Hz supply I system. If they are left open circuited, then the frequency of the voltage produced across two slip rings would be:

12.5 Hz

25.0 Hz

37.5 Hz

50.0 Hz

42. For maximum current during 'Slip Test' on a synchronc1us machine the armature mmf aligns along;

d-axis

q-axis

45° to d-axis,

45° to q-axis

43. A 3-phase to 3-phase cyclo­convertor requires:

18 SCRS for 3-pulse device

18 SCRS for6-pulse device

36SCRS for 3-pulse device

52 SCRS for 6-pulse device

44. The ratio of.starting torqueto running ,torque in asynchronous motor is:

Zero I

One

Two

Infinity,


45. 3-phase synchronous motor will have:

No slip ri1gs

One slip ring

Two slip rings

Three slip rings

46. Which interrupt has the highest priority?

ItifR

TRAP

RST6.5

TRSP



47. Name the 16 bit registers in 8085:

Program counter

Stack pointer

Both and

None of. the above

52. In 8086 micro processor the following has thE highest priority among all types of interrupts:

NMI

DIVO

TYPE255

OVER FLOW
53. In 8086 microprocessor of the following statements is not true:

Coprocessor is interfaced in MAX mode

Coprocessor is interfaced in MIN mode

I/O can be interfaced in MAX/MIN mode

Supports pipelining

54. 8088 microprocessor differs from 8086 microprocessor in

Data width on the output

Address capability

Support of coprocessor

Support of MAXIMIN mode

55. Address line for TRAP is

0023 H

0024 H

0033 H

0034 H

56. When an.8086 executes an INT type instruction, it:

Resets both IF and T,F flags

Reset all flags

Set both IF and TF

Resets the IF and TF

57. What will be the contents of register AL after the following has been .executed AL.

MOV8L,8e

MOVAL,.7E ..

ADOAL,8L

OA and carry flag is set

OA and carry flag is

6A and carry flag is set

6A and carry flag is reset

58. Direction flag is used with:

String instructions

Stack instructions

Arithmetic instructions

Branch instructions

59. 8251isa

UART'

USART

Programmable interrupt controller

Programmable interval timer! couNter

60. . Which type of JMP instruction assembles if the distance is 0020 H bytes?

Near

Far

Short

None of the above

61. A germanium diode has a saturation current of 10-8A. Calculate the junction current for a forward bias of O.4Vand 300K temperature

20mA

100mA

80mA

48mA

62. The amount of feedback applied to an amplifier reduces the gain by a factor of 10. The bandwidth:

Decreases by a factor of 10

Increases by a factor of 10

Remains the same

None of the above .

63. The primary advantage of crystal oscillation is that:

It can oscillate to any frequency

It gives high output voltage .

The frequency of oscillation remains almost constant

It operates on a very low DC supply voltage

64. The number 43 in compliment representation is

01010101 .

11010101

00101011

10101011

65. A 12 bitADC is operating with 1i1sec clock period .and total conversion time is seen to be 14 micro seconds. The ADC must be of:

Flash type .

Counting type

Integrating type

SucCessive. approximation . type

66. Function ofZener diode is to provide to galvanometer circuit.

Constant voltage

Constant current.

Variable voltage

Variable current



68. A signal may have frequency components which lie in the range of 0.001 Hz to 10 Hz. Which one of the following types of couplings should be chosen in a multi stage amplifier designed to amplify the signal?

R-C coupling

Transformer coupling

Direct coupling

Double tuned transformer coupling

69. A tuned amplifier has peak outputat2 MHz and quality factor 50. The band width and 3dB frequencies shall be at what values respectively?

40 KHz, 2.02 MHz, 1.98 MHz

40 KHz, 2.04 MHz, 1.96 MHz

80 KHz, 2.04 MHz, 1.96 MHz

80 KHz, 2.08 MHz, 1.92 MHz

70. The Octal equivalent of the HEX . numberAB.CD is

253.314

253.632

526.314

526.632

71. Which of the folloWing subtractions results in F16

(BA)16

2 (BC)16

3(CB)16

Only 1 and2

Only 1 and 3

Only2 and 3

1,2 and 3

72. The realization is equal to:

AND-NOT realization

AND-OR realization

OR-AND realization

NOT-OR realization

73. An AND gate:

ImplEments logic addition

Gives high output only when all

inputs are low Is eQuivalent to a series switching circuit·

Is equivalent to a parallel switchiNg circuit

74. The voltage levels for a negative logic system:

Must necessarily be negative

Could be negative or positive

Must necessarily be positive

Must necessarily be either zero or-5V

75. For coherent detection of digital signals, the receiver must be: .

Synchronized,in time only

Synchronized in phase only

Synchronized in time, and phase

Unsynchronized

76. Modulation index is

VmlVc

Vd/Vm



None of the above

77. fc+fm is: .

Upper band frequency

Lower band frequency

Mid band frequency

None of the above

78. In amplitude modulation, frequency is:

Constant

Zero

Variable

One

79. In frequency modulation, frequency is:

Constant

Zero

Variable

One

80. In Frequency modulation has:

One carrier with infinite frequencies

None of the above

81. Amplitude modulation has:

·One carrier

One carrier with two side band frequencies

One carrier with in finite frequencies

None of the above

82. FM signal is less affected by

Loss

Temperature

Frequency

Noise

83. In order to reduce interference, the signal should be

Amplified

Multiplied

Demodulated

Modulated

84. An example for an analog signal is:

Sine wave

Impluse signal

Sample signal

None of the above

85. Messages travel from transmitter receiver with help of:

Transmitter.

Receiver

Channel

Antennas

86. Bandwidth of FM signal is than AM signal.

lesser

either lesser or larger

larger

None of the above

87. In AM modulation, when the modulation index increases, transmitted power is

Constant

Increased

Decreased

None of the above

88. In FM modulation, when the modulation index increases, transmitted power is

Constant

Increased

Decreased

None of the above

89. Sound signals in TV are:

Amplitude modulated

dc modulated

Frequency modulated

Both and

90. Video signals in TV are:

Amplitude modulated

dc modulated

Frequency modulated .

None of the above