104 A

QUESTION BOOKLET Q.B. Number:

104 Post: Jr. Engineer (Electrical)

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Page 1 of 16 Page - 2
1. Ward - Leonard controlled DC drives are generally 7. Asingle phase 60 Hz generator supplies an inductive
load of 4500kW at a power factor of 0.80 lagging by
used for: means of a 20 km long overhead transmission line.
(A) Light duty excavators
The line resistance and inductance are 0.0195 ohm
and 0.60 mH per km. The voltage at the receiving
(B) Medium duty excavators end is required to be kept constant at 10.2 kV. Find
the voltage regulation of the line.
(C) Heavy duty excavators
(A) 12.59%
(D) Low duty excavators
(B) 16.34%
2. Bohr Magneton is unit of:
(C) 32.68%
(A) Magnetic energy
(D) 41.15%
(B) Permanent dipole moment due to spin
8. What is the energy stored in the magnetic field at a
(C) Polarisability
solenoid of 40 cm long and 4 cm diameter wound
(D) Hysteresis with 100 turns of wire carrying a current at 20A?
3. What is the required connection for an enhancement
(A) 0.705 Joule
type N-MOSFET to function as a resistor?
(B) 0.789 Joule
(A) Gate connected to sources
(C) 0.587 Joule
(B) Gate connected to drain
(D) 0.658 Joule
(C) Drain connected to sources
9. What does the maximum Surge current rating of an
(D) Source open-circuited
SCR specify?
4. What is the Output voltage of Op-amp for input » Wed
voltage of Vit=150 pV,V2=140 pV if the amplifier has (A) Repetitive current with sine wave.
?gfoerentlal gain of As=4000 and valus{of CMRR is (B) Non-repetitive current with rectangular wave.

(A) 45.8 mV - h hs ¢ C) Non-repetitive current with sine wave.

(B) 40.006 mV A ACOde ep (D) Repetitive current with rectangular wave.

(©) 10V 10. If a=0.995, [e=10 mA and lco=0.5 mA, then lceo will

(D) 145 pv. be

5. What happens when the shunt resistance of a (49100 pA
galvanometer circuit is increased? (B) 25 A

(A) Its current sensitivity increases. (C) 10.1 A

(B) Its current sensitivity decreases. (D) 10.5 bA

(C) It's damping increases. 11. An electromechanical closed ~loop control system

(D) It's controlling torque increases. has the transfer function

C(s)/R(s) = k/s (s2 + s +1) (s+ 4) +k. Which one of the
6. A DC shunt generator supplies 450 A at 230 V. The
following is correct?
resistances of shunt field and armature are 50 Q and
0.025 Q respectively. What will be the armature (A) The system is stable for all positive values of k

voltage drop? (B) The system is unstable for all values of k

(A) 11.24V (C) The system is stable for values of k between zero

(8) 227V and 3.36

(©)316V (D) The system is stable for values of k between 1.6
(D) 384V and 2.45

Page 2 of 16 Page - 3
U4 A

12. A large transformer operating at no load draws an What does the discharge transistor do in the 555
exciting current lo- of 5A, when the primary is
connected to a 120 V, 60 Hz source. From a timer circuit?
wattmeter test, it is known that iron losses are equal
(A) Discharge the external capacitor to stop the
to 180 W. Calculate the reactive power absorbed by
the core. timing
(A) 600 var (B) Charge the external capacitor to stop the timing
(B) 572 var (C) Discharge the external capacitor to start the
(C) 180 var timing over again
(D) 360 var (D) Charge the external capacitor to start the timing
13. A 60 Hz, 4 pole turbo generator rated 100 MVA, 13.8 over again
KV has an inertia constant of 10 MJ/MVA. Find the
stored energy in the rotor at synchronous speed. 19. The differential coupling of two coils in series
(A) 10 MJ connection has self-inductance of 2mH & 4 mH & a

(B) 100J mutual inductance of 0.15 mH. The equivalent

(C) 1000 J inductance of the combination is:

(D) 1000 MJ (A) 5.7 mH

(B) 5.85 mH
ool
14. Error detector is also called as
WS ©6mH

/A pcode™e?
(A) Multiplexer

(B) Decoder (D) 6.156 mH

(C) Comparator L 4 20. Two's complement of -8 is

(D) Integrator (A) 1000

15. For measuring the frequency of an unknown A.C. (B) 1010
source. Which of the following device is necessary to (C) 110
obtain a standard waveform? (D) 1110
(A) Operational amplifier 21. Which among the following is the equation for the

(B) Astable multivibrator number of independent loops for a network with n

(C) Schmitt trigger nodes and b branches?

(D) Monostable multivibrator (A) n-1

16. The reciprocal of resistance is called (B) b+n-1
(A) Impedance (C) b-n+1
(B) Conductance (D) b-n
(C) Inductance 22. A Lissajous pattern on an oscilloscope has 5

(D) Susceptance horizontal tangencies and 2 vertical tangencies. The

17. frequency of the horizontal input is 1000 Hz. What is

A 150 kW electric motor has an efficiency of 92 %,
the frequency of the vertical input?
when it operates at full load. Calculate the losses in
the machine. (A) 400 Hz
(A) 92 kW (B) 5000 Hz

(B) 150 kW (C) 4000 Hz

(C) 163 kW (D) 2500 Hz

(D) 13 kW

Page 3 of 16 Page - 4
23. For a transient stability analysis, as long as equal 28. A 30 MVA, 15 KV, 1500 rpm, 3 phase synchronous
area criterion is satisfied, the maximum angle to generator connected to a power grid has a
which rotor angle can oscillate is: synchronous reactance of 9 ohm per phase. If the

(A) 0" to 20° exciting voltage is 12 kV (line to neutral) and the

(B) 45" to 50° system voltage is 17.3 kV (line to line), Calculate the

(C) Greater than 90° maximum power that generator can deliver before it

(D) 65" to 85° falls out of step (losses synchronous).

24. What is the equivalent resistance of one limb A when

(A) 39.952 MW

delta connection is transformed in to star? (B) 78.349 MW

(A) RiRa/R+Ro+Rs3 (C) 16.67 MW
(B) RzR3/R1+R2+R3 (D) 112.89 MW

(C) RiR:Ro/R1+R2+Rs 29. Byte is string of how many bits?

(D) Ri+R2+R3 (A) Eight

25. Calculate the power loss, if power generated by two (B) Four

plants are P1=50 MW and P> =40 MW and the loss (C) Two

coefficients are B11=0.001, B22=0.0025 and (D) Sixteen

B12=-0.0005. 30. What is the nature of supply current in parallel RC

(A) 4.5 MW circuit with reference to the voltage?

(B) 5.5 MW (A) In phase

(C) 6.5 MW (B) Lags by 90 degree

(D) 8.5 MW (C) Leads by 90 degree

26. Q factor is defined as the ratio of (D) Compensates and becomes zero

(A) Resistance /inductance of reactive element 31. Calculate the approximate locked rotor current of a

(B) Resistance/capacitance of reactive element 3 phase induction motor having a rating of 500 Hp,

(C) Resistance to reactance of reactive element 2300 V.

(D) Resistance to susceptance of reactive element (A) 130 A
27. A 0.5 Hp, 6 pole wound rotor induction motor is (B) 39A
excited by a 3 phase 60 Hz source. Calculate the (C)390 A
frequency of the rotor current at standstill. (D) 780 A
(A) 50 Hz 32. A Power system has a total load of 1260 MW at 50

(B) 30 Hz Hz. The load varies 1.5% for every 1% change in

(C) 60 Hz frequency. Find the steady state frequency deviation,

(D) 120 Hz when a 60 MW load is suddenly dripped if there is no

speed control.

(A) 1.667 Hz
(B) 50 Hz
(C) No change

(D) 3.32Hz

Page
4 of 16 Page - 5
104 A

33. For a two port symmetric bilateral network, if A= 3Q 39. Internal resistance of a cell depends on
and B = 10, the value of parameter C will be (A) Terminal voltage
(A) 4s (B) Torque
(B) 6s (C) Current
(C) 8s (D) Area of the plates
(D) 16s 40. Q- meter is based on characteristics of
34. In order to recover the original signal from the (A) Shunt resonant circuit
Sampled one, what is the condition to be satisfied for
sampling frequency ws and highest frequency (B) Series-parallel circuit
component wm?
(C) Series resonant circuit
(A) Wm < Ws £ 2 Wm
(D) Inductive reactance circuit
(B) ws 2 2 wm
41. A 3 Phase, 60 Hz generator connected in Y
(C) ws < wm connection, generates a line to line voltage of 23900
V. Calculate the peak line voltage.
(D) ws = Wm
(A) 13800 V
35. In the measurement of three phase power by two
wattmeter method, if the two wattmeter readings are (B) 33800 V
equal then power factor of the circuit is
(C) 42300 V
(A) 0.8 lag
(D) 23900 V
(B) Unity
42. A practical voltage source consists of an ideal voltage
(C) 0.8 lead
source in
(D) Zero
(A) Series with internal resistance
36. When a resistor R is connected to a current source, it
consumes a power of 18 W. When the same R is (B) Parallel with internal resistance
connected to a voltage source having the same
magnitude as the current source, the power absorbed (C) Series with impedance
by R is 4.5 W. The magnitude of the current source (D) Series with capacitance
and the value of R are
43. The AC source shown in the figure has an effective
(A) V18A and 1Q voltage of 120 V, 60 Hz. The load draws a DC current
(B) 3A and 2Q of 20 A. Calculate the average DC current in each
diode.
(C) 1A and 18Q peak voltage = £
(D) 6A and 0.5Q
37. In a control system, moving a summing point right
side to the block yields in

(A) Multiplication of the G(s) in the feedback path

(B) Multtiplication of the 1/G(s) in the feedback path

(C) Addition of gain block

(D) Subtraction of gain block

38. What is the order of the characteristic equation of an
armature controlled DC motor?
(A\) First order equation (A)5A
(B) Second order equation (B)10A
(C) Zero order equation (©)20A
(D) Third order equation (D)o
Page 5 of 16 Page - 6
44, If the load current and flux of a DC motor are held 49. The measurement of dielectric loss and power factor
constant, and voltage applied across its armature is is done using
increased by 10%, its speed will: (A) Weins Bridge
(A) Decrease by 10%. (B) Hays Bridge
(B) Remain unchanged. (C) Schering Bridge
(C) Increase by 10%. (D) Wheat Stone Bridge
(D) Increase by 20%. 50. A choke coil having resistance RQ2 and of inductance
45. The meter constant of a single phase 240 V induction L Henry is shunted by a capacitor of C farads. The
watt hour meter is 400 revolutions per KWhr. The dynamic impedance of the resonant circuit would be:
speed of the meter disc for a current of 10 A of 0.8 pf, (A) RILC
lagging will be (B) C/RL
(A) 12.8 rpm (C)LIRC
(B) 16.02 rpm (D) 1/RLC
(C) 18.2 rpm 51. If the characteristics equation of a closed loop system
(D) 21.1 rpm is s2+2s+2=0, then the system is
46. For a class A operation, the biasing resistor should (A) Over damped
be adjusted such that (B) Critically damped
(A) Q-point never lies (C) Under damped
(B) Q-point lies in the middle of the load line (D) Undamped
(C) Q-point lies in the cut off region 52. What would be the total power drawn from the
(D) Q-point lies on the operating region supply, when two heaters, rated at 1000 W, 250 V
47. A single phase transformer rated at 3000 kVA, 69 kV/ each are connected in series across a 250 V, 50 Hz
4.16 kV, 60 Hz has a total internal impedance Z, of supply?
127 ohm, referred to the primary side. Calculate the (A) 1000 W
primary current if the secondary is accidentally short (B) 500 W
circuited. (C) 250 W
(A) 43.5 A (D) 2000 W
(B) 543 A 53. In case of four pole, lap wound machine if the air gap
(C) 9006 A under each pole is the same, then what will be the
(D) 721 A result?
48. For a fault at terminals of the synchronous generator, (A) There will be reduced eddy currents
the fault current is maximum for a: (B) There will be reduced hysteresis loss
(A) Three phase fault (C) Current in each path will not be the same
(B) Double line to ground fault (D) It will result in higher terminal voltage
(C) Line to line fault

(D) Line to ground fault

Page 6 of 16 Page -7
 A thyristor power converter is said to be in 59. The usual value of slip of a 3® induction motor at full
discontinuous when: load is about:
(A) The load current is zero even though the load (A) 0.05
voltage is present. (B) 0.1
(B) Both load voltage and load current are zero ()03
simultaneously. (D)0.8
(C) The load current is present even though load 60. A system function has a pole at s=0 and a zero at
voltage is zero. s= -1. The constant multiplier is unity. For an
(D) When load current is ripple free. excitation cos(t), What is the steady-state response?
55. What is the basic principle of operation of a (A) ¥2sin(t+45°)
transformer? (B) v2sin(t-45%)
(A) Self-induction (C) sin(t-459)
(B) Mutual-induction (D) Sin(t)
(C) Static-induction 61. Which of the following gate is called universal gate?
(D) Dynamic-induction (A) AND
56. The technique of using stair case ramp in DVM (B) NOT
(Digital Volt Meter) is called (C) NOR
(A) Deflecting torque technique (D) EX-OR
(B) Null balancing technique 62. When ‘n’ resistances each of value '’ are connected
(C) Controlling torque technique in parallel, then the resultant resistance is ‘x’. When
(D) Detaching torque technique these ‘n’ resistances are connected in series, total
57. What is the clock cycle time for a system that uses a resistance is
clock with frequency of 150 kHz? (A) n2X
(A) 55 p sec (B) X/n
(B) 5.5 p sec (C) n2/X
(C) 202 sec (D) nX2
(D) 6.6 p sec 63. According to Biot-Savart's laws the magnetic field at
58. Norton's Theorem is a way to reduce a network to a point due to incremental element of length dI
(A) An equivalent circuit composed of a single current carrying a current is

source, series resistance, and series load (A) Inversely proportional to the current carried by the

(B) An equivalent circuit composed of a single element

voltage source, parallel resistance, and parallel (B) Directly proportional to the current carried by the
load element
(C) An equivalent circuit composed of a single (C) Directly proportional to the square of the distance
voltage source, series resistance, and series load (D) Inversely proportional to the length of the element
(D) An equivalent circuit composed of a single current
source, parallel resistance, and parallel load

Page 7 of 16 Page - 8
 A Transformer rated 250 kVA, 4160 V / 480 V, 60 Hz 70. Which loss has least proportion in DC machines?
has an impedance of 5.1%. Calculate the total
impedance of the transformer referred to the primary (A) Armature copper loss
side.
(B) Field copper loss
(A) 69 ohm
(C) Magnetic loss
(B) 0.92 ohm
(D) Mechanical loss
(C) 8.52 ohm
7. Fermi level is the measure of
(D) 0.51 ohm
(A) Doping of electrons
65. Maximum power developed in a synchronous motor
(B) Probability of occupancy of electrons or holes
occurs at a coupling angle of:
(C) Probability of occupancy of photons
(A) 120°
(D) Probability of occupancy of wavelength
(B) 60°
72. Which of the following testing methods is a direct
(C) 90°
testing of D C machine?
(D) 0°
(A) Swinburne's Test
66. If each branch of a Delta circuit has impedance 32,
then each branch of the equivalent Y circuit has (B) Field Test
impedance:
(C) Hopkinson’s Test
(A) ZIW3
(D) Brake Test
(B)3z
73. The radix of binary number is
(C)3v3z
A1
(D) zZ/3
®0
67. Metallic copper is a:
©2
(A) Paramagnetic substance
()8
(B) Diamagnetic substance
74. We wish to build a 135 V, 20 A, DC power supply
(C) Ferromagnetic substance
using a single phase bridge rectifier and an inductive
(D) Ferrimagnetic substance
filter. The peak to peak current ripple should be about
68. An op-amp having a slew rate of 62.8 V/msec, is
connected in a voltage follower configuration. If the 10%. If a 60 Hz AC source is available; Calculate the
maximum amplitude of the sinusoidal input is 10 V, peak to peak current ripple.
then the minimum frequency at which the slew rate
limited distortion would set in at the output is (A) 19A
(A) 1 MHz (B)20 A
(B) 6.28 MHz (C)2A
(C) 10 MHz (D)1A
(D) 62.8 MHz 75. The per unit impedance of a circuit element is 0.30. If
69. A galvanised steel tower member has original length
the base kV and base MVA are halved, then the new
of 22cm and cross sectional area of 13 cm2 With
working axial tensile load of 125 KN, the change in value of the per unit impedance of the circuit element
length was 0.2 mm. Calculate the percentage of
will be:
elongation.
(A) 0.0712% (A) 0.3
(B) 0.00612% (B) 0.6
(C) 0.0909% (C) 0.003
(D) 0.19% (D) 0.006

Page 8 of 16 Page - 9
104 A

76. The transfer function of a phase lead compensator is [ 81. | an instrument transformer the errors can be
found to be the form (s+z1 ) / (s + p1 ) and that of a
lag compensator to be of the form (s+zz) / (s + pz ). reduced by
I:fi:fie\g!;mh of the following conditions must be (A) Using high reluctance core

(A) z1 > p1and 22> p2 (B) Using small cross sectional area

(B) z1 > p1and z2 < p2 (C) Using low permeability materials

(C)z1<piand z2 < p2 (D) Using low reluctance core

(D) z1 < p1and z2> p2 82. An energy meter has a constant of 600 rev/kWh. If
77. A Transmission line conductor has been suspended the meter makes 10 revolutions in 20 s, what is the
freely from two towers and has taken the form of a load in kW?
catenary that has ¢ = 487.68m. The span between :
the two towers is 152 m, and the weight of the (A) 0.75 kW
conductor is 1160 kg/km. Calculate the length of the
conductor. (B) 1.5kW
(A) 487.68 m (C) 3kwW
(B) 1562.614 m (D) 6 kW
(C)5.934 m 83. Which one among these is an example for trivalent
(D)11.9m impurity?

78. Whatis a load cell? (A) Phosphorus

(A) A strain gauge (B) Antimony
(B) A photo voltaic cell (C) Gallium
(C) A thermistor (D) Arsenic
(D) A pressure pick up device 84. A 750 Hp, 250 V, 1200 r/min DC motor is connected
p p P to a 208 V, 3 phase, 60 Hz, line using a 3 phase
79. Signal flow graph is a bridge converter. The full load armature current is
2500 A and the armature resistance is 4 m ohm.
(A) Polar plot Calculate the required firing angle under rated full
(B) Bode plot load conditions.
(C) Topological representation of set of differential (A) 45 deg
equations (B) 208 deg
(D) Truth table (C) 27 deg
80. A 16 kV DC source having an internal resistance of 1
ohm supplies 900A to a 12 kV, 3 phase 6 pulse 60 (D) 32 deg
::é ;Rzzn::' Calculate the DC voltage generated by | 85 | the solution of load flow equation, Newton
35A Raphson (NR) method is superior to the Gauss-

A Seidal (GS) Method, because the:

e . (A) Convergence characteristic of the NR methods

——@) inverter are not affected by selection of slack bus
(B) Number of iterations required in the NR method is
o not independent of the size of the system

g (C) Time taken to perform one iteration in the NR

(A) 27000 V method is less when compared to the GS method
(B) 15100V (D) Number of iteration required in the NR method is

(C) 16000 V more than compared to that in the GS method

(D) 16400 V

Page 9 of 16 Page - 10
s

86. A three phase 50 Hz, 400 kV transmission line is 300 90. The generator shown in the figure rotates at 6000
km long. The line inductance is 0.97 mH/km per r/min and generates an effective sinusoidal voltage of
phase and capacitance is 0.0115 mF/km per phase. 170 V per winding. Calculate the output frequency.
Assume a loss less line. Determine the line
wavelength (a line phase constant). stator winding A

(A) 1250 km
winding B
(B) 6578 km
(C) 4990 km
(D) 2445 km
87. A Phase shift transformer is designed to control 150
MVA on a 230 kV, 3 phase line. The phase angle is
variable between zero and +15 deg. Calculate the (A) 100 Hz
approximate basic power rating of the transformer. (B) 10 Hz
(A) 150 MVA (C)1Hz
(B) 56 MVA (D) 1 kHz
(C) 75 MVA 91. Three resistors of 4 Q, 6 Q and 9 Q are connected in
(D) 750 MVA parallel. Which resistor consumes the maximum
88. What is the most effective way to reduce the cost of power?
power generation in a power station? A)4Q
(A) By increasing the diversity factor and decreasing (B)6Q
the load factor ©)9a
(B) By increasing both the diversity factor and the Dy17
load factor 92. A 30 MVA, 13.2 KV synchronous generator has a
(C) By decreasing both the diversity factor and the solidly grounded neutral. Its positive, negative and
load factor zero sequence impedances are 0.30, 0.40 and 0.05
(D) By decreasing the diversity factor and increasing pu respectively. What value of reactance must be
the load factor placed in the generator neutral so that the fault
89. What happens to the angle between current and current for a line to ground fault of zero fault
voltage, when a small capacitance is added in series impedance shall not exceed the rated line current.
with a highly inductive circuit? (A) 4.416 ohm
(A) Increases (B) 8.8 ohm
(B) Remains same as earlier angle (C) 2.08 ohm
(C) Decreases (D) 10.2 ohm
(D) Becomes indeterminant 93. What is the time constant of an RC series circuit?
(A) RIC
(B) CIR
(C) 1/RC
(D)RC

Page 10 of 16 Page - 11
104A

94. Which of the following is a scalar quantity? 100. The direction of rotation of hysteresis motor is

(A) Electric field strength determined by the:

(B) Electric displacement density (A) Resistivity of the rotor material.

(C) Electric potential (B) Amount of hysteresis loss.

(D) Force (C) Permeability of rotor material.

95. An alternator is feeding an infinite bus bar. Its prime (D) Position of shaded pole w.r.t main pole.

mover is suddenly shut down. The alternator will: 101. The power in a 3phase circuit is measured with the
help of 2 wattmeters. The reading of one of
(A) Continue to work as alternator but the direction of wattmeters is positive and that of the others is
rotation will reverse. negative. The magnitude of readings is different. It
can be concluded that the power factor of the circuit
(B) Come to stand still. is
(C) Continue to work as synchronous motor and (A) Unity

direction of rotation will also be same. (B) 2 (lagging)

(D) Will work as an induction motor. (C) 5 (lagging)
96. What is essential for a successive approximation N- (D) Less than 0.5 (lagging)

bit ADC? 102. Copper shading is provided in energy meter to

(A) 2N clock pulses for conversion, an up-down (A) Bring flux exactly in quadrature with applied

counter and a DAC. voltage

(B) N clock pulses for conversion, a binary counter (B) To increase speed of aluminium disc

and a comparator. (C) To count the rotation

(C) 2N clock pulses for conversion and a binary (D) To balance the system from vibration
counter only. 103. What is the Bode amplitude plot of a first-order low-
(D) N clock pulses for conversion, an up-down pass system?
counter and a DAC. (A) Line with slope -40 dB/decade
97. The nodal method of circuit analysis is based on (B) Line with slope -20 dB/decade
(A) KVL and ohms law (C) Line with slope +20 dB/decade
(B) KVL and KCL (D) Straight line parallel to the frequency axis
(C) KCL and ohms law 104. A 200 V, 50 Hz inductive circuit takes a current of 10
A at 30 degree lagging pf, what is the inductive
(D) Thevenins theorem reactance of the circuit?
98. What is the dimensional representation of Power? (A)17.80Q
(A) ML2T3 (8) 100 @
(B) M2L2T-3 (€)1780
(C) MLT-3 (D) 100
(D) M2LT2 105. What type of insulators are used whenever the
conductors are dead ended and there is a change in
99. A pulse transformer is used in a driver circuit to: the direction of transmission line?
(A) Prevent DC triggering. (A) Shackle type

(B) Shape trigger signal. (B) Strain type

(C) Generate high frequency pulses. (C) Pin type

(D) Provide isolation. (D) Suspension type

Page 11 of 16 Page - 12
104A

106. A ramp voltage V(t)=100 V is applied to an RC 112. The capacitance of 0-1000V electrostatic voltmeter
increases from 36-42 pF from zero to full scale
differentiating circuit with R=5 kQ and C=4 uF. The deflection. It is required to extend the range of
maximum output voltage is voltmeter to 10000 V by using an external series
capacitor. What should be the value of series
(A) 0.2V capacitor?
(B)2V (A) 0.8 pF
C)10v (B) 1.00 pF
(D)50 vV (C) 6.644 pF
107. What is the equivalent resistance of a network having (D) 4.667 pF
5 resistors of each 10ohm connected in parallel? 113. A single phase motor draws a current of 5 A from a

(A) 10 Ohms 120V, 60 Hz line. The power factor of the motor is

(B) 50 Ohms 65%. Calculate the active power absorbed by the

(C) 500 Ohms motor.

(D) 2 Ohms (A) 600 W
108. What language is understood by ‘Micro Processor'?
(B) 390 W
(A) Binary
(C) 456 W

(B) Fortran
(D) 650 W
114. A parallel combination of capacitance C and
(C) Instruction
resistance R is connected in series with inductance L
(D) C++ and small resistance r. Under what condition will the
circuit be non-reactive?
109. The current i(t), through a 10 Q resistor in series with
(A) C=LR
an inductance, is given by
(B) C=LR?
I(t) = 3 + 4sin (100t + 450 ) + 4 sin(300t +600)
(C) C=L/R?
amperes. The RMS values of the current and power
(D) C=L/R
dissipation in the circuit are:
115. A shunt motor rotating at 1500 r/min is fed by a 120 V'
(A) V41 A, 410 W respectively
source. The line current is 51 A and the shunt field
(B) V35 A, 350 W respectively
resistance is 120 ohm. If the armature resistance is
(C) 5 A, 250 W respectively
0.1 ohm, calculate the current in the armature.
(D) 11 A, 1210 W respectively
A)1A
110. What is peak factor of a sinusoidal wave?
(B) 51 A
(A) 1.11
(C)50 A
(B) 1.414 (D)12A
(C) 3.142 To Charge a 120 V battery from a 600 V DC source
116.
(D) 4.44 using a DC chopper, The average battery current
should be 20 A, with a peak to peak ripple of 2 A. If
1. Which test is used to determine the magnetizing the chopper frequency is 200 Hz, calculate the duty
cycle.
impedance of a transformer?
(A) 0.2
(A) Short-circuit test
(8)0.1
(B) Impulse test
(©)05
(C) Load test
(D) 0.6
(D) Open- circuit test

Page 12 of 16 Page - 13
17. A conductor is composed of seven identical copper 123. Which of the following power plants involves high
strands, each having a radius 'R'. Then what is self initial cost in erecting?
GMD (Geometric Mean Distance) of the conductor? (A) Hydro-electric power plant
(A) 2.645R (B) Steam power plant
(B) 2.177R (C) Gas turbine power plant
(C)2.141R (D) Nuclear power plant
(D)1.21R 124. A 220 kV, 3 phase transmission line is 60 km long.
The resistance is 0.15 ohm / km and the inductance
118. What type of excitation is given to the rotor winding of is 1.4 mH / km. Use the short line model to find the
a synchronous motor? power at the sending end when the line is supplying a
three phase load of 300 MVA at 0.8 pf lagging at 220
(A) DC supply at 100 -250 V/ kV.
(B) AC supply at 400 V (A) 5.58MW
(C) Revolving field (B) 80MW
(D) Induction from stator currents (C) 85.58MW
119. For a two port network to be reciprocal: (D) 74.42 MW

(A) Z11=Z2 125. What is the value of total electric flux coming out of
(B) Yz1= Ya1 closed surface?

(C) hz21= hz2 (A) Zero

(D) AD-BC = 0 (B) Equal to volume charge density

120. A metal oxide varistor (MOV) is used for protecting: (C) Equal to the total charge enclosed by the surface

(A) Gate circuit against over currents (D) Equal to the surface charge density

126. A Reactor having an inductive reactance of 4 ohm is

(B) Gate circuit against over voltages.
connected to the terminals of a 120 V AC generator.
(C) Anode circuit against over currents. Calculate the power associated with the reactor.

(D) Anode circuit against over voltages. (A) 3.6 kvar

121. (B) 30 kvar

What is the decimal equivalent of hexa decimal no
(8A6)? (C) 7.2 kvar

(A) 1422 (D) 4.16 kvar

127. A coil having 90 turns is connected to a 120 V, 60 Hz
(B) 1242 source. If the effective value of the magnetizing
(C) 2122 current is 4 A. Calculate the inductance of the coil.

(D) 2214 (A) 79.6 mH

122. The sending and receiving end voltages of a three (B) 121.2 mH
phase transmission line at 100 MW load are equal at
230 KV. The phase line impedance is j14 ohm.
(C)32.2mH
Calculate the maximum steady state power that can (D) 83.16 mH
be transmitted over the line. A 1mA D' Arsonval movement has resistance of 100
128.
(A) 3778.5 MW Q. Itis to be converted to a 10 V voltmeter. The value
of multiplier resistance is
(B) 2234.56 MW
(A) 999 Q
(C) 1784.19 MW.
(B) 9999 Q
(D) 512.37 MW
(C) 9900 Q
(D) 990 Q

Page 13 of 16 Page - 14
4 A

129. Three single phase transformers are connected in 135. Which of the following plants is suitable for peak
delta-delta to step down a line voltage of 138 kV to
4160 V to supply power to a production plant. The load?
plant draws 21 MW at a lagging power factor of 86 %.
(A) Diesel engine plant
Calculate the apparent power furnished by the HV
line. (B) Steam power plant
(A) 24.4 MVA (C) Nuclear power plant
(B) 48.8 MVA (D) Hydro-electric plant
(C) 12.2 MVA 136. Which of the following serves as donor impurity in
(D) 6.1 MVA Silicon?
130. A three phase breaker is rated at 2000 MVA, 33 kV, (A) Boron
its making current is (B) Indium
(A) 70 kA (C) Germanium
(B) 89 kA (D) Antimony
(C) 49 kA 137. The phase voltages across a certain load are given
(D) 35 kA as Va= (176 - j132) V, Vo = (-128-96) V and Ve = (-
131. What is the minimum clearance of HV Lines from 160 +j100) V. Compute positive sequence
ground across streets? component of voltage.
(A) 3 meters (Ao
(B) 8 meters (B) 163.24-j35.1 V
(C) 6 meters (C) 50.1453.9 V
(D) 5 meters (D) 25.1453.9 V
132. The stator of a 3 phase, 10 pole induction motor 138. What is the power factor of a cable of loss angle “e"?
possesses 120 slots. If a lap winding is used,
calculate the coil pitch, if the coil width extends from (A) sine
slot 1 to slot 11.
(B) cos e
(A) 72.12%
(C)tane
(B) 83.30%
(D) Independent of e
(C) 12%
139. Which of the following gate is inverted OR gate?
(D) 42%
(A) NAND
133. What is the pitch factor of a 4 pole alternator having
(B) NOR
36 slots and a coil span of 1 to 8?
(C) AND
(A) 140°
(D) EX-OR
(B) 80°
140. Determine the transformer tap ratios when the
(C) 20° receiving end voltage is equal to the sending end
voltage, the high voltage line operates at 220 kV and
(D) 40°
transmit 80 MW at 0.8 pf and the impedance of the
134. What is the main drawback of the underground line is (40+j140)ohm. Assume tst=1.0
transmission system compared to the overhead
transmission system?
(A) 0.8
(A) Exposure to lightning (8)0.9
(B) Heavy initial cost
©o7
(C) Exposure to atmospheric hazards such as
smoke, ice, wind (D) 0.6
(D) Induction interference between power and
communication circuits

Page 14 of 16 Page - 15
104 A

141. RMS value of rectangular wave of period T, having a 146. One 200 KVA transformer has an iron loss of 1 KW
value of +V for a duration T+(<T) and -V for the and full load Cu loss of 2 KW. Its load KVA
duration T-T+=T2 equals corresponding to maximum efficiency is:

(A)V (A) 100 KVA

(B) T-T2/ T (B) 141.4 KVA
(C)V/V2 (C) 50 KVA
(D) T1/T2 (D) 200 KVA
142, The hysteresis loop of magnetic material has an area 147. A three phase transmission line delivers a load of 5
of 5 cm? with the scales given as 1 cm=2AT and 1 MW at 0.8 power factor lagging. Resistance of each
cm=50 mWb, at 50 Hz, the total hysteresis loss is conductor is 0.5 ohm / km. Receiving end voltage is

(A) 15W 33 kV. If the line loss is not to exceed 10%,

/7 Aca demer!U
(B)20 W determine the length of the line.

(C)25W (A) 7km

(D) 50 W (B) 27.9 km
143. What does the region around the stationary electric (C) 56.8 km
charge has? (D) 13.9 km

(A) Electric field 148. Which among the following is the dual of Boolean

(B) Magnetic field expression X+YZ=(X+Y) (X+2Z)?

(C) Semi permeable region (A) X(Y+Z)=XY+YZ

(D) Insulating field (B) X.(Y+Z)=X.Y+X.Z
144. Which of the following statements is CORRECT? (C) X+(Y+2Z) = X.Y+Z
(A) A grid-connected induction generator always (D) X+(YZ) = X+Y+Z
supplies lagging reactive power to the bus. 149. What is the purpose of providing a fuse in an electric

(B) An overexcited synchronous motor draws current circuit?

at a lagging power factor. (A) To safe guard the installation against heavy

(C) An under excited synchronous generator current

connected to an infinite bus works at a leading (B) To reduce the current flowing in the circuit
power factor. (C) To reduce the power consumption

(D) The load angle of a synchronous machine is the (D) To improve power factor
angle between the excitation voltage and the load 150. FET belongs to which of the following type of device?
current. (A) Current controlled device
145. In which type of the faults given below, all of the three (B) Magnetic device
components lao, la1 and la2 are equal? (C) Power controlled device
(A) Single line to ground fault (D) Voltage controlled device
(B) Double line to ground fault

(C) Line to line fault

(D) 3 phase faults

Page 15 of 16 Page - 16