1. <img src='./qimages/3399-29.jpg'>

2. <img src='./qimages/3399-29.jpg'>

3. <img src='./qimages/3399-29.jpg'>

4. Several light bulbs are connected in series and one light bulb burns out, the other light bulbs: .

All bulbs stop working

All bulbs light more

All bulbs burn out

None of the above

5. Fuses are used to

Protect the circuit I equipment

Keep wires overheated from getting

Break the circuit when too much current is being used

All of The above

6. An electric kettle is rated at 1000 W for use in a 220-V circuit. A 12A circuit fuse I breaker is installed on the circuit. How many kettles can be safely operated in the circuit?

More than 4

3

2

1

7. Electrical devices in our homes are connected in

Parallel

Series

Both series and parallel

None of the above

8. If you plug an electric toaster rated at 110V into a 220-V outlet, current in the toaster will be

The same as if it were plugged into 110V

Twice what it should be

Half what it should be

None of the above

9. When a current flows through a resistance for time the electrical energy spent is given by

IR ·t

12R·t

IR2 ·t

12R1t

10. Kilowatt-hour is the unit of:

Potential difference

Electric power

Electrical energy

Electric charge

11. The power dissipated in a resistor is directly proportional to

The current through this resistor

The resistor value

The voltage across the resistance

All of the above

12. Transformer action requires:

Alternating electric flux

Alternating magnetic flux

Constant magnetic flux

Any of the above

13. A commutator in a dc generator provides:

Half-wave rectification

Full-wave rectification

Half-wave controlled rectification

FUll-wave controlled rectification

14. In a three-phase induction motor, the maximum torque is

Independent of rotor resistance

Proportional to rotor resistance

Proportional to square of rotor resistance

Proportional to square root of rotor resistance

15. Rated speed of a three-phase induction motor is 1,440 rpm for 50 Hz supply, the number of pole is

6-pole

2-pole

8-pole

4-pole

16. If the roter of induction motor rotates at synchronous speed, the torque produced is

High

Low

Zero

Infinity

17. In 50 Hz induction machine, if the no load speed is 745 rpm, the synchronous speed is

700 rpm

750 rpm

800 rpm

850 rpm

18. In 50Hz induction machine, if the no load speed is 2900 rpm, the slip frequency is

0.33 Hz

0.67 Hz

1.33 Hz

1.67 Hz

19. If P number of poles and N revolution made per second, what is the frequency of an alternator

PN/2 Hz

120/PN Hz

120 NIP Hz

120 P IN Hz

20. A series motor is efficiently suitable for:

High starting torque operation

Low starting torque operation

Constant speed operation

None of the above

21. Refer to the circuit of figure below, if V VR 9 then the power x absorbed by element R is

<img src='./qimages/3399-21.jpg'>

22. A certain practical dc voltage source can provide a currentof2.5Awhen it is short-circuited and can provide a power of 80 W to a 20-Q load. The open circuit voltage of the source is

22.2V

80V

8.88V

200V

23. The current through a capacitor is given by 7 sin(PIE mAo If the energy stored at t 200 ms is 3 mew what is the value of the capacitance?

2.99 mF

3.02 mew F

18.14nF

7.00mF

24. . The value of voltage Vx in the following circuit is

<img src='./qimages/3399-24.jpg'>

9.89 cos(400t 78.76°) V

7.80 cos(400t 48.9°) V

5.00 cos(400t V

1.95 cos(400t -41.21°) V

25. The power delivered in VA to a load that draws 500 W at a leading power factor of 0.75 is:

500 -41.41°

500 41.41

666.7 41.41°

666.7

26. For a particular circuit, it is known that

V12 =100 V=60 V 45 42 =80 120° and V35 all in volts. Then V25 in volts will equal to

189.8 34.95°

56.67 <'-11.520V

80 130°

43.48

27. A parallel RLC circuit is measured to have a quality factor of 200 at resonant frequency. The value of if

R kQ and C mewF is

25pH

25 mewH

40mH

40nH

28. A signal 10e-2tu(t) is applied to a linear system for which the impulse response is =10e-2t The output is

100e-2tu(t)

=100te-2tu(t)

10e-2tu(t)

1ote-2tu(t)

29. If and then will be equal to



20(e-2t

20(e-3t e­2t)



30. In the circuit shown below, the current through the inductor is

<img src='./qimages/3399-30.jpg'>

31. For the circuit shown in the figure, the voltage and current expressions

are E1 sin(wt) E3 sin(30wt)
and 11 sin (wt -pie1)

i 3,sin (30lt -pie3) Is sin(5wt).

The average power measured by the wattmeter is

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

32. In the following figure, C1 and C2 are ideal capacitors. C1 has been charged to 12 V before the ideal switch 8 is closed at t O. The current for all t is

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

A step function'

An exponentially decaying function

An impulse function

33. With sources iA and vB in the following circuit arid vc ix=20 A,withiAandVonand vB= c ix A and finally, with all three x sources on, ix 12 the value of ix if only ia is operating is: .

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


3A

17A

20

34. A circuit consists of a 0.5 H inductor, a 10 Q resistor and a 40 Q resistor in series. The inductor current is 4 A at t O. The inductor current after 15 ms becomes:

0.89A

0.68A

0.57A

0.45A

35. A practical current source provides 10W to a 250 Q load and 20 W to an 80 Q load. A resistance RL voltage vL and current iL, is connected to it. If is a maximum, L then the value of RL

33.33 Q

Infinite

Zero

60.61 MEW

36. The voltage across a 5 H inductor is

<img src='./qimages/3399-36.jpg'>

0.08A

1.08A

0.47A

Zero

37. A current source of 4 a 20 Q resistor and a 5 capacitor are all in parallel. The amplitude of the current source drops suddenly to zero at t O. The time at which the capacitor voltage drops to one-half of its initial value is

34.66 mews

69.31mews

0.69 mewS

507.5mew

38. If the admittance of the parallel combination of a 10 Q resistance and a 50 ItF capacitance at 1 krad/s is the same as the admittance of Rand C in the series at that 11 frequency, then the value of C1 is

250 mewF

0.05 mewF

100 mewF

8lmewF

39. The value of RL the following circuit L that will absorb a maximum power is:

<img src='./qimages/3399-39.jpg'>
4Q

8Q

12Q

8.9Q

40.
<img src='./qimages/3399-40.jpg'>

41. A system has an. overall transfer function equal to a2/s2(s where a is a positive constant. For large values of time the output approximately resembles:

Ramp function

A unit step function

An exponential function

A quadratic function

42. The output of a linear time invariant control system is for a certain input If is modified by passing it through a block whose transfer function is e-5 and then applied to the system, the modified output of the system would be:










43.

<img src='./qimages/3399-43.jpg'>


44. If for a closed loop control system having open loop gain and feedback path gain the position error constant K 1 and p acceleration error constant K 0.5 a then the steady state error for input is



5

8



45. A system has overall closed loop . 36 If t.t' gain 36/s2+9s+36 given to the system, what is the time duration between first two successive peak overshoots?

1.58

2pie

0.81

1.8

46. A system has overall transfer function .The eXpression for peak time tp be obtained by p equating to zero, the derivative of:

Input with respect to time (Turn over)

The convolution of "and with respect to time

with respect to time where is the system response

delta(t)T(p) with respect to time, where delta(t) is the impulse response

47. If state equation is


<img src='./qimages/3399-47.jpg'>

48.
<img src='./qimages/3399-48.jpg'>

49. The Asymptote in the Bode Plot for .

<img src='./qimages/3399-49.jpg'>


50. . When a lag compensator is used for ,the compensation of a system, the magnitude bode plot of the compensated system:

Remains unaltered

Always lies below the uncompensated system

Always lies above the uncompensated system

Remains unaltered up to some low frequency and lies below the uncompensated system for higher frequencies.

51. causes offset error and can be used to remove it.

Integral controller, proportional controller

Proportional controller, integral controller

Integral controller, derivative controller

Derivative controller, integral controller

52. The ac motor used in servo application is a

Single phase induction motor

Two phase induction motor

Three phase induction motor

Synchronous motor


53. A block with' transfer function . s+2·/s+1 is connected in cascade to a zero order hold. The. sampled data transfer function of this discrete time system is:

<img src='./qimages/3399-53.jpg'>


54.

<img src='./qimages/3399-54.jpg'>

55.
<img src='./qimages/3399-55.jpg'>

56. The transfer function of a system is 100 given as 100/S2+20s+100

An over damped system

An under damped system

An critically damped system

An unstable system

57. A system with zero initial conditions has the closed loop transfer function.

The system output is zero at the frequency:

0.5 rad/sec

1 rad/sec

2 rad/sec

4 rad/sec

58. When subject to a unit step input, the closed loop control system shown in the figure given below will have a steady state error of

<img src='./qimages/3399-58.jpg'>
-1.0 0


59. For the equation s3 _4s2 S the number of roots in the left half of . s-plane will be

Zero

One

Two

Three

60. The Nyquist plot of loop transfer function of a closed loop control system passes through the point jO) in the GsHs plane. The phase margin of the system is:

0°

45°

90°

180°

61. The limiting error of measurement of power consumed by the current passing through a resistance are ± 1.5% and ± respectively. Then the limiting error of measurement of resistance will be

±0.5%

±0.1%

±0.25%

±3.5%

62. A CRO screen has ten divisions on the horizontal scale. If a voltage signal 5 sin(314t is examined with a line base setting of 5 m sec/div, the number of cycles of signal displayed on the screen will be

0.5 cycle

2.5 cycles

5 cycles

10 cycles

63. The number of comparators needed in a parallel conversion type 8-bit analog to digital convertor is

8

16

255

256

64. An LVOT is used to measure displacement. The output of the 1A116 1 LVOT is connected to a voltmeter of range 0 to 5 V through an amplifier having a gain of 250. For a displacement of 0.5 mm, the output of the LVOT is 0.5 mV. The sensitivity of the instrument would be:

0.1 V/mm

0.5V/mm

1V/mm

5V/mm

65. For the ac bridge shown in the figure at balance, the value of Rd, Land d Qdwill be respectively:

<img src='./qimages/3399-65.jpg'>
(RaRb)/Rc RaRc'Cb; wCbRb

(RaRb)/Rc RaRc'Cb ;wCbRb

(RaRb)/Rc RaRc'Cb wCbRb

(RaRb)/Rc RaRc'Cb; wCbRb

66. The velocity of flow using Snell's law of refraction applicable to sound waves is: cf1

2MsinS eM

2f1 sin e 2f1 sinS

cM 2cf1

MsinS

67. Forgaspressurebelow1mmHg,the thermal conductivity of gas is

68. In a digital voltmeter, the oscillator frequency is 400 KHz and ramp voltage falls from 8 V to 0 V is 20 m sec. The number of pulses counted by the counter is

800

2000

4000

8000

69. The fact as to how closely the instrument reading follows the measured variables is called the:

Independent of pressure

Dependent of pressure

Independent of volume

Dependent of volume



70. The ratio and phase angle errors in potential transformer may be reduced by:

Increasing the exciting current

Increasing the resistance and leakage reactance in the transformer

By not employing turns compensation

None of the above

71. A dual trace CRO has a number of time base circuit of

1

2

3

4

72. The deflection of a moving coil galvanometer becomes one-fourth when shunted by 20 ohms resistance. The resistance of the galvanometer is:

10

40

60

50 14 Contd.

73. A galvanometer with a resistance of G ohms is shunted by a resistance of S ohms. The resistance to be added for the current to remain unchanged is

S/S G



SG/G+S

G2/G

74. The term artificial ageing in instruments is associated with:

Springs

Permanent Magnet

Damper

Both and

75. Which one of the following DVM has excellent noise rejection feature?

Ramp type DVM

Dual slope type DVM

Successive approximation type DVM

Flash type DVM

76. By saying that the electrostatic field is conservative, we do not mean that:

It is the gradient of a scalar potential

Curl is identically zero

The work done in a closed path inside the field is zero

The potential difference between the two points is zero

77. If

<img src='./qimages/3399-77.jpg'>

in a given material, the material is said to be

Linear

Isotropic

Linear and homogeneous

Linear and Isotropic

78. Which of the following potential does not satisfy Laplace's equation?

5

r cos pie

p cos pie+10

10xy

79. In a certain medium, electric field E=10cos (108t-3y)ax vim. What .x type of medium is it?

Free space

Perfect dielectric

Lossless dielectric

Perfect conductor

80. In the free space, magnetic field intensity at any point

<img src='./qimages/3399-80.jpg'>

81. For the lossless transmission line which of the following option is correct for attenuation constant a and phase constant

<img src='./qimages/3399-81.jpg'>

82. Identify which of the following expressions are not Maxwell's· equations for time varying fields:
<img src='./qimages/3399-82.jpg'>

83. A loop is rotating about the y-axis in a magnetic field Bo sin wt ax wb/m2. The voltage reduced in the loop is due to:

Motional emf

Transformer emf

A combination of motional and transformer emf

None of the above

84. In cylindrical coordiriates the equation

<img src='./qimages/3399-84.jpg'>
Laplace's equation

Helmholtz's equation

Maxwell's equation

Poisson's equation

85.

<img src='./qimages/3399-85.jpg'>

86. Volume charge density in the free ,space is given by

<img src='./qimages/3399-86.jpg'>

87. Dielectric strength of a material depends on

Moisture content

Temperature

Thickness

All of the above

88. Which of the following is a vector quantity?

Relative permeability

Magnetic field intensity

Flux density

Magnetic potential

89. "The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed." The above statement is associated with:

Coulomb's Square Law

Gauss' Law

Maxwell's First Law

Maxwell's Second Law

90. A field line and an equipotential surface are:

Always parallel

always at 90 degress
Inclined at any angle a

None of the above