104 A

QUESTION BOOKLET

104

Q.B. Number:

Post: Jr. Engineer (Electrical)

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Page 1 of 16

104 A

1.

Ward - Leonard controlled DC drives are generally

7.

used for:
(A) Light duty excavators
(B) Medium duty excavators
(C) Heavy duty excavators

(A) 12.59%

(D) Low duty excavators

2.

(B) 16.34%

Bohr Magneton is unit of:

(C) 32.68%

(A) Magnetic energy

(B) Permanent dipole moment due to spin
(C) Polarisability

(D) 41.15%
8.

with 100 turns of wire carrying a current at 20A?

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

(C) Drain connected to sources
(D) Source open-circuited
4.

(D) 0.658 Joule

9.

(A) Repetitive current with sine wave.

(B) Non-repetitive current with rectangular wave.

(A) 45.8 mV

(C) Non-repetitive current with sine wave.

(B) 40.006 mV

(D) Repetitive current with rectangular wave.

10.

If =0.995, IE=10 mA and ICO=0.5 mA, then ICEO will

be

(D) 145 V

(A) 100 A

What happens when the shunt resistance of a

galvanometer circuit is increased?

(B) 25 A

(A) Its current sensitivity increases.

(C) 10.1 A

(B) Its current sensitivity decreases.

(D) 10.5 A

(C) Its damping increases.

(D) Its controlling torque increases.
6.

What does the maximum Surge current rating of an

SCR specify?

What is the Output voltage of Op-amp for input

voltage of Vi1=150 V,Vi2=140 V if the amplifier has
differential gain of Ad=4000 and value of CMRR is
100.

(C) 10 V
5.

What is the energy stored in the magnetic field at a

solenoid of 40 cm long and 4 cm diameter wound

(D) Hysteresis
3.

A single phase 60 Hz generator supplies an inductive

load of 4500kW at a power factor of 0.80 lagging by
means of a 20 km long overhead transmission line.
The line resistance and inductance are 0.0195 ohm
and 0.60 mH per km. The voltage at the receiving
end is required to be kept constant at 10.2 kV. Find
the voltage regulation of the line.

A DC shunt generator supplies 450 A at 230 V. The

resistances of shunt field and armature are 50 and
0.025 respectively. What will be the armature

11.

An electromechanical closed loop control system

has the transfer function
C(s)/R(s) = k/s (s2 + s +1) (s+ 4) +k. Which one of the
following is correct?
(A) The system is stable for all positive values of k

voltage drop?

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

(A) 11.24 V

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

(B) 22.7 V
(C) 31.6 V
(D) 38.4 V

Page 2 of 16

and 3.36
(D) The system is stable for values of k between 1.6
and 2.45

104 A

12.

A large transformer operating at no load draws an 18.

exciting current Io of 5A, when the primary is
connected to a 120 V, 60 Hz source. From a
wattmeter test, it is known that iron losses are equal
to 180 W. Calculate the reactive power absorbed by
the core.

What does the discharge transistor do in the 555

(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

14.

(A) 10 MJ

connection has self-inductance of 2 mH & 4 mH & a

(B) 100 J

mutual inductance of 0.15 mH. The equivalent

(C) 1000 J

inductance of the combination is:

(D) 1000 MJ

(A) 5.7 mH

Error detector is also called as

(B) 5.85 mH

(A) Multiplexer

(C) 6 mH

(B) Decoder

(D) 6.15 mH
20.

over again

Two's complement of -8 is

(D) Integrator

(A) 1000

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
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

The reciprocal of resistance is called

(B) b+n-1

(A) Impedance

(C) b-n+1

(B) Conductance

(D) b-n

(C) Inductance
17.

(D) Charge the external capacitor to start the timing

The differential coupling of two coils in series

(A) Operational amplifier

16.

timing

A 60 Hz, 4 pole turbo generator rated 100 MVA, 13.8

KV has an inertia constant of 10 MJ/MVA. Find the
19.
stored energy in the rotor at synchronous speed.

(C) Comparator
15.

(A) Discharge the external capacitor to stop the

timing over again

(D) 360 var

13.

timer circuit?

22.

A Lissajous pattern on an oscilloscope has 5

(D) Susceptance

horizontal tangencies and 2 vertical tangencies. The

A 150 kW electric motor has an efficiency of 92 %,

frequency of the horizontal input is 1000 Hz. What is

when it operates at full load. Calculate the losses in

the frequency of the vertical input?

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

104 A

23.

24.

For a transient stability analysis, as long as equal

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).

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) R1R3/R1+R2+R3

(C) 16.67 MW

(B) R2R3/R1+R2+R3

(D) 112.89 MW
Byte is string of how many bits?
(A) Eight

Calculate the power loss, if power generated by two

(B) Four

plants are P1=50 MW and P2 =40 MW and the loss

(C) Two

coefficients are B11=0.001, B22=0.0025 and

(D) Sixteen
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

Q factor is defined as the ratio of

(D) Compensates and becomes zero

(A) Resistance /inductance of reactive element

27.

29.

(D) R1+R2+R3

B12=-0.0005.

26.

A 30 MVA, 15 KV, 1500 rpm, 3 phase synchronous

area criterion is satisfied, the maximum angle to

(C) R1R2R3/R1+R2+R3
25.

28.

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

A 0.5 Hp, 6 pole wound rotor induction motor is

(B) 39 A

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) 3.32 Hz

Page 4 of 16

104 A

33.

For a two port symmetric bilateral network, if A= 3

(A) Terminal voltage

(A) 4s

(B) Torque

(B) 6s

(C) Current

(C) 8s

(D) Area of the plates

40.

In order to recover the original signal from the

Sampled one, what is the condition to be satisfied for
sampling frequency s and highest frequency
component m?
(B) s 2 m
(C) s < m

(B) Series-parallel circuit

(C) Series resonant circuit
(D) Inductive reactance circuit
41.

(D) s = m

(B) 33800 V
(C) 42300 V

(A) 0.8 lag

(C) 0.8 lead

(D) 23900 V
42.

When a resistor R is connected to a current source, it

consumes a power of 18 W. When the same R is
connected to a voltage source having the same
magnitude as the current source, the power absorbed
by R is 4.5 W. The magnitude of the current source
and the value of R are
(A) 18A and 1
(B) 3A and 2
(C) 1A and 18

A practical voltage source consists of an ideal voltage

source in

(D) Zero
36.

A 3 Phase, 60 Hz generator connected in Y

connection, generates a line to line voltage of 23900
V. Calculate the peak line voltage.
(A) 13800 V

In the measurement of three phase power by two

wattmeter method, if the two wattmeter readings are
equal then power factor of the circuit is
(B) Unity

Q- meter is based on characteristics of

(A) Shunt resonant circuit

(A) m < s 2 m

35.

Internal resistance of a cell depends on

and B = 1, the value of parameter C will be

(D) 16s
34.

39.

(A) Series with internal resistance

(B) Parallel with internal resistance
(C) Series with impedance
(D) Series with capacitance
43.

The AC source shown in the figure has an effective

voltage of 120 V, 60 Hz. The load draws a DC current
of 20 A. Calculate the average DC current in each
diode.

(D) 6A and 0.5

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) Multiplication 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) 5 A

(B) Second order equation

(B) 10 A

(C) Zero order equation

(C) 20 A

(D) Third order equation

(D) 0

Page 5 of 16

104 A

44.

If the load current and flux of a DC motor are held

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

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) R/LC

lagging will be

(B) C/RL

(A) 12.8 rpm

(C) L/RC

(B) 16.02 rpm

(D) 1/RLC
51.

If the characteristics equation of a closed loop system

(D) 21.1 rpm

is s2+2s+2=0, then the system is

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
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

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 Zp 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

48.

A choke coil having resistance R and of inductance

L Henry is shunted by a capacitor of C farads. The

(C) Q-point lies in the cut off region

47.

50.

The meter constant of a single phase 240 V induction

(C) 18.2 rpm

46.

The measurement of dielectric loss and power factor

constant, and voltage applied across its armature is

(D) Increase by 20%.

45.

49.

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?

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

104 A

54.

A thyristor power converter is said to be in

59.

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

(C) 0.3

simultaneously.
(C) The load current is present even though load

(D) 0.8
60.

voltage is zero.
55.

What is the basic principle of operation of a

(A) 2sin(t+450)

transformer?

(B) 2sin(t-450)

(A) Self-induction

(C) sin(t-450)

(B) Mutual-induction

(D) Sin(t)
61.

Which of the following gate is called universal gate?

(D) Dynamic-induction

(A) AND

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
62.

When n resistances each of value r 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

What is the clock cycle time for a system that uses a

resistance is

clock with frequency of 150 kHz?

(A) n2X

(A) 55 sec

(B) X/n

(B) 5.5 sec

(C) n2/X

(C) 202 sec

(D) nX2

(D) 6.6 sec

58.

s= -1. The constant multiplier is unity. For an

excitation cos(t), What is the steady-state response?

(B) Null balancing technique

57.

A system function has a pole at s=0 and a zero at

(D) When load current is ripple free.

(C) Static-induction
56.

The usual value of slip of a 3 induction motor at full

63.

According to Biot-Savarts laws the magnetic field at

Norton's Theorem is a way to reduce a network to

a point due to incremental element of length dl

(A) An equivalent circuit composed of a single current

carrying a current is

source, series resistance, and series load

(B) An equivalent circuit composed of a single
voltage source, parallel resistance, and parallel
load
(C) An equivalent circuit composed of a single
voltage source, series resistance, and series load
(D) An equivalent circuit composed of a single current
source, parallel resistance, and parallel load

Page 7 of 16

(A) Inversely proportional to the current carried by the

element
(B) Directly proportional to the current carried by the
element
(C) Directly proportional to the square of the distance
(D) Inversely proportional to the length of the element

104 A

64.

A Transformer rated 250 kVA, 4160 V / 480 V, 60 Hz 70.

has an impedance of 5.1%. Calculate the total
impedance of the transformer referred to the primary
side.
(A) 69 ohm

(D) 0.51 ohm

65.

71.

(B) Probability of occupancy of electrons or holes

(C) Probability of occupancy of photons

(A) 120

(D) Probability of occupancy of wavelength

72.

(A) Swinburne's Test

If each branch of a Delta circuit has impedance 3 Z,

then each branch of the equivalent Y circuit has
impedance:

(B) Field Test

(C) Hopkinsons Test

(A) Z/3
(B) 3Z
(C) 33Z

(D) Brake Test

73.

(B) 0

Metallic copper is a:

(C) 2

(A) Paramagnetic substance

(B) Diamagnetic substance
(C) Ferromagnetic substance

(D) 8
74.

filter. The peak to peak current ripple should be about

An op-amp having a slew rate of 62.8 V/msec, is

connected in a voltage follower configuration. If the
maximum amplitude of the sinusoidal input is 10 V,
then the minimum frequency at which the slew rate
limited distortion would set in at the output is

10%. If a 60 Hz AC source is available; Calculate the

peak to peak current ripple.
(A) 19 A

(A) 1 MHz

(B) 20 A

(B) 6.28 MHz

(C) 2 A

(C) 10 MHz

(D) 1 A

(D) 62.8 MHz

69.

We wish to build a 135 V, 20 A, DC power supply

using a single phase bridge rectifier and an inductive

(D) Ferrimagnetic substance

68.

The radix of binary number is

(A) 1

(D) Z/3
67.

Which of the following testing methods is a direct

testing of D C machine?

(D) 0
66.

Fermi level is the measure of

(A) Doping of electrons

occurs at a coupling angle of:

(C) 90

(B) Field copper loss

(D) Mechanical loss

Maximum power developed in a synchronous motor

(B) 60

(A) Armature copper loss

(C) Magnetic loss

(B) 0.92 ohm

(C) 3.52 ohm

Which loss has least proportion in DC machines?

A galvanised steel tower member has original length

of 22cm and cross sectional area of 13 cm2. With
working axial tensile load of 125 KN, the change in
length was 0.2 mm. Calculate the percentage of
elongation.

75.

The per unit impedance of a circuit element is 0.30. If

the base kV and base MVA are halved, then the new
value of the per unit impedance of the circuit element
will be:

(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

104 A

76.

The transfer function of a phase lead compensator is 81.

found to be the form (s+z1 ) / (s + p1 ) and that of a
lag compensator to be of the form (s+z2 ) / (s + p2 ).
Then which of the following conditions must be
satisfied?
(B) z1 > p1 and z2 < p2

(C) Using low permeability materials

(C) z1 < p1 and z2 < p2

(D) Using low reluctance core

82.

the meter makes 10 revolutions in 20 s, what is the

(A) 487.68 m

(C) 3 kW

(B) 152.614 m

(D) 6 kW

load in kW?
(A) 0.75 kW
(B) 1.5 kW

83.

Which one among these is an example for trivalent

(D) 11.9 m

impurity?

What is a load cell?

(A) Phosphorus

(A) A strain gauge

(B) Antimony

(B) A photo voltaic cell

(C) Gallium

(C) A thermistor

(D) Arsenic
84.

Signal flow graph is a

(A) Polar plot
(B) Bode plot
(C) Topological representation of set of differential
equations
(D) Truth table

80.

An energy meter has a constant of 600 rev/kWh. If

A Transmission line conductor has been suspended

freely from two towers and has taken the form of a
catenary that has c = 487.68m. The span between
the two towers is 152 m, and the weight of the
conductor is 1160 kg/km. Calculate the length of the
conductor.

(D) A pressure pick up device

79.

(A) Using high reluctance core

(B) Using small cross sectional area

(C) 5.934 m
78.

reduced by

(A) z1 > p1 and z2 > p2

(D) z1 < p1 and z2 > p2

77.

In an instrument transformer the errors can be

A 16 kV DC source having an internal resistance of 1

ohm supplies 900A to a 12 kV, 3 phase 6 pulse 60
Hz inverter. Calculate the DC voltage generated by 85.
the inverter.

A 750 Hp, 250 V, 1200 r/min DC motor is connected

to a 208 V, 3 phase, 60 Hz, line using a 3 phase
bridge converter. The full load armature current is
2500 A and the armature resistance is 4 m ohm.
Calculate the required firing angle under rated full
load conditions.
(A) 45 deg
(B) 208 deg
(C) 27 deg
(D) 32 deg
In the solution of load flow equation, Newton
Raphson (NR) method is superior to the GaussSeidal (GS) Method, because the:
(A) Convergence characteristic of the NR methods
are not affected by selection of slack bus
(B) Number of iterations required in the NR method is
not independent of the size of the system
(C) Time taken to perform one iteration in the NR

(A) 27000 V

method is less when compared to the GS method

(B) 15100 V

(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

104 A

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).
(A) 1250 km
(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) 1 Hz

(B) 56 MVA

(D) 1 kHz

(C) 75 MVA
88.

91.

parallel. Which resistor consumes the maximum

What is the most effective way to reduce the cost of

power?

power generation in a power station?

(A) 4

(A) By increasing the diversity factor and decreasing

(B) 6

the load factor

(C) 9

(B) By increasing both the diversity factor and the

load factor

(D) 17
92.

(C) By decreasing both the diversity factor and the

A 30 MVA, 13.2 KV synchronous generator has a

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

89.

Three resistors of 4 , 6 and 9 are connected in

(D) 750 MVA

placed in the generator neutral so that the fault

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) R/C
(B) C/R
(C) 1/RC
(D) RC

Page 10 of 16

104 A

94.

95.

Which of the following is a scalar quantity?

(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.

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:

(A) Continue to work as alternator but the direction of
rotation will reverse.
(B) Come to stand still.
(C) Continue to work as synchronous motor and
direction of rotation will also be same.
96.

(B) 2 (lagging)

What is essential for a successive approximation N-

(D) Less than 0.5 (lagging)

counter and a DAC.

(B) N clock pulses for conversion, a binary counter
and a comparator.
(C) 2N clock pulses for conversion and a binary
counter only.
(D) N clock pulses for conversion, an up-down
counter and a DAC.

102. Copper shading is provided in energy meter to

(A) Bring flux exactly in quadrature with applied
voltage
(B) To increase speed of aluminium disc
(C) To count the rotation
(D) To balance the system from vibration
103. What is the Bode amplitude plot of a first-order lowpass system?
(A) Line with slope -40 dB/decade

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

(D) Thevenins theorem

104. A 200 V, 50 Hz inductive circuit takes a current of 10

A at 30 degree lagging pf, what is the inductive
reactance of the circuit?

What is the dimensional representation of Power?

(A) 17.8

(A) ML2T-3

(B) 100

(B) M2L2T-3

(C) 178

(C) MLT-3

(D) 10

(D) M2 LT-2
99.

(A) Unity
(C) 5 (lagging)

(A) 2N clock pulses for conversion, an up-down

98.

101. The power in a 3phase circuit is measured with the

help of 2 wattmeters. The reading of one of
wattmeters is positive and that of the others is
negative. The magnitude of readings is different. It
can be concluded that the power factor of the circuit
is

(D) Will work as an induction motor.

bit ADC?

97.

100. The direction of rotation of hysteresis motor is

A pulse transformer is used in a driver circuit to:

105. What type of insulators are used whenever the

conductors are dead ended and there is a change in
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

104 A

106. A ramp voltage V(t)=100 V is applied to an RC

differentiating circuit with R=5 k and C=4 F. The
maximum output voltage is
(A) 0.2 V

112. The capacitance of 0-1000V electrostatic voltmeter

increases from 36-42 pF from zero to full scale
deflection. It is required to extend the range of
voltmeter to 10000 V by using an external series
capacitor. What should be the value of series
capacitor?

(B) 2 V

(A) 0.8 pF

(C) 10 V

(B) 1.00 pF

(D) 50 V

(C) 6.644 pF

107. What is the equivalent resistance of a network having

5 resistors of each 10ohm connected in parallel?

(D) 4.667 pF
113. A single phase motor draws a current of 5 A from a

(A) 10 Ohms

120 V, 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

(C) Instruction
(D) C++
109. The current i(t), through a 10 resistor in series with
an inductance, is given by
I(t) = 3 + 4sin (100t + 450 ) + 4 sin(300t +600)
amperes. The RMS values of the current and power
dissipation in the circuit are:
(A) 41 A, 410 W respectively
(B) 35 A, 350 W respectively
(C) 5 A, 250 W respectively
(D) 11 A, 1210 W respectively
110. What is peak factor of a sinusoidal wave?
(A) 1.11
(B) 1.414
(C) 3.142
(D) 4.44
111. Which test is used to determine the magnetizing
impedance of a transformer?
(A) Short-circuit test
(B) Impulse test
(C) Load test
(D) Open- circuit test
Page 12 of 16

114. A parallel combination of capacitance C and

resistance R is connected in series with inductance L
and small resistance r. Under what condition will the
circuit be non-reactive?
(A) C=LR
(B) C=LR2
(C) C=L/R2
(D) C=L/R
115. A shunt motor rotating at 1500 r/min is fed by a 120 V
source. The line current is 51 A and the shunt field
resistance is 120 ohm. If the armature resistance is
0.1 ohm, calculate the current in the armature.
(A) 1 A
(B) 51 A
(C) 50 A
(D) 12 A
116. To Charge a 120 V battery from a 600 V DC source
using a DC chopper, The average battery current
should be 20 A, with a peak to peak ripple of 2 A. If
the chopper frequency is 200 Hz, calculate the duty
cycle.
(A) 0.2
(B) 0.1
(C) 0.5
(D) 0.6

104 A

117. 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) 2.645 R

(B) Steam power plant

(B) 2.177 R

(C) Gas turbine power plant

(C) 2.141 R

(D) Nuclear power plant

(D) 1.21 R

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
power at the sending end when the line is supplying a
a synchronous motor?
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= Z22

125. What is the value of total electric flux coming out of

(B) Y21 = Y21

closed surface?

(C) h21 = h22

(A) Zero

(D) AD-BC = 0

(B) Equal to volume charge density

120. A metal oxide varistor (MOV) is used for protecting:

(A) Gate circuit against over currents
(B) Gate circuit against over voltages.
(C) Anode circuit against over currents.
(D) Anode circuit against over voltages.
121. What is the decimal equivalent of hexa decimal no

(C) Equal to the total charge enclosed by the surface

(D) Equal to the surface charge density
126. A Reactor having an inductive reactance of 4 ohm is
connected to the terminals of a 120 V AC generator.
Calculate the power associated with the reactor.
(A) 3.6 kvar
(B) 30 kvar

(8A6)?

(C) 7.2 kvar

(A) 1422

(D) 4.16 kvar

(B) 1242
(C) 2122
(D) 2214
122. The sending and receiving end voltages of a three
phase transmission line at 100 MW load are equal at
230 KV. The phase line impedance is j14 ohm.
Calculate the maximum steady state power that can
be transmitted over the line.
(A) 3778.5 MW
(B) 2234.56 MW
(C) 1784.19 MW
(D) 512.37 MW

127. A coil having 90 turns is connected to a 120 V, 60 Hz

source. If the effective value of the magnetizing
current is 4 A. Calculate the inductance of the coil.
(A) 79.6 mH
(B) 121.2 mH
(C) 32.2 mH
(D) 83.16 mH
128. A 1mA D' Arsonval movement has resistance of 100
. It is to be converted to a 10 V voltmeter. The value
of multiplier resistance is
(A) 999
(B) 9999
(C) 9900
(D) 990

Page 13 of 16

104 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
load?
4160 V to supply power to a production plant. The
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

(D) 6.1 MVA
130. A three phase breaker is rated at 2000 MVA, 33 kV,

136. Which of the following serves as donor impurity in

Silicon?
(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, Vb = (-128-j96) V and Vc = (-

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

(A) 0

(B) 8 meters

(B) 163.24-j35.1 V

(C) 6 meters

(C) 50.1-j53.9 V

(D) 5 meters

(D) 25.1-j53.9 V

132. The stator of a 3 phase, 10 pole induction motor 138. What is the power factor of a cable of loss angle ?
possesses 120 slots. If a lap winding is used,
(A) sin
calculate the coil pitch, if the coil width extends from
slot 1 to slot 11.
(B) cos
(A) 72.12%
(C) tan
(B) 83.30%
(D) Independent of
(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
line is (40+j140)ohm. Assume tstr=1.0
134. What is the main drawback of the underground
transmission system compared to the overhead
(A) 0.8
transmission system?
(B) 0.9
(A) Exposure to lightning
(B) Heavy initial cost
(C) 0.7
(C) Exposure to atmospheric hazards such as
(D) 0.6
smoke, ice, wind
(D) Induction interference between power and
communication circuits
Page 14 of 16

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 T1(<T) and -V for the

and full load Cu loss of 2 KW. Its load KVA

duration T-T1=T2 equals

corresponding to maximum efficiency is:

(A) V

(A) 100 KVA

(B) T1-T2 / T

(B) 141.4 KVA

(C) V / 2

(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 cm2 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) 15 W

33 kV. If the line loss is not to exceed 10%,

(B) 20 W

determine the length of the line.

(C) 25 W

(A) 7 km

(D) 50 W

(B) 27.9 km

143. What does the region around the stationary electric

charge has?
(A) Electric field

(C) 56.8 km
(D) 13.9 km
148. Which among the following is the dual of Boolean

(B) Magnetic field

expression X+YZ=(X+Y) (X+Z)?

(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+Z) = X.Y+Z

(A) A grid-connected induction generator always

(D) X+(YZ) = X+Y+Z

supplies lagging reactive power to the bus.

(B) An overexcited synchronous motor draws current
at a lagging power factor.
(C) An under excited synchronous generator

149. What is the purpose of providing a fuse in an electric

circuit?
(A) To safe guard the installation against heavy
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

angle between the excitation voltage and the load
current.
145. In which type of the faults given below, all of the three

(D) To improve power factor

150. FET belongs to which of the following type of device?
(A) Current controlled device
(B) Magnetic device

components Ia0, Ia1 and Ia2 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

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104 A

Space for Rough work:

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