1.
Which of the following material does not allow the current to flow in it
A
Conductor
B
Insulator
C
Semiconductor
D
Superconductor
Answer/ Hint
2.
How much power (in W) will be dissipated by a 5 Ohm resistor in which the value of current is 2 A
A
10
B
30
C
20
D
40
Answer/ Hint
3.
Which property of an electrical conductor opposes a change in the current
A
Resistance
B
Capacitance
C
Conductance
D
Inductance
Answer/ Hint
4.
What is the resistivity (in Ohms-m) of a 2 ohm cylindrical wire when the length and the diameter of the wire are 10 m and 0.4 m respectively
A
0.025
B
0.0025
C
0.25
D
0.05
Answer/ Hint
5.
Farad is the S.I. unit of ________ .
A
Inductance
B
Resistance
C
Capacitance
D
Reluctance
Answer/ Hint
6.
What is the equivalent capacitance (in μF) for the circuit given below
A
4.56
B
4.32
C
54.65
D
54.28
Answer/ Hint
7.
What will be the resistance (in Ohms) of a lamp rated at 220 V, 200 W
A
220
B
224
C
244
D
242
Answer/ Hint
8.
What is the equivalent resistance (in Ohm) for the circuit given below
A
5
B
7
C
10
D
4
Answer/ Hint
9.
Two wires of same resistivity have equal length. The cross sectional area of first wire is two times to the area of the other. What will be the resistance (in Ohms) of the wire that has a large cross sectional area, if the resistance of the other wire is 20 ohms
A
40
B
20
C
30
D
10
Answer/ Hint
10.
What will be the resistance (in Ohms) of bulb A for the circuit given below
A
4.65
B
2.36
C
3.3
D
1.33
Answer/ Hint
11.
Which of the following statement is CORRECT
A
Norton’s theorem is same as superposition theorem.
B
Norton’s theorem is the converse of superposition theorem.
C
Norton’s theorem is same as Thevenin’s theorem.
D
Norton’s theorem is the converse of Thevenin’s theorem.
Answer/ Hint
12.
The algebraic sum of the electric currents meeting at a common point is __________
A
Infinity
B
Zero
C
One
D
Negative
Answer/ Hint
13.
Which of the following law is based on the conservation of energy
A
Kirchhoff’s Current Law
B
Kirchhoff’s Voltage Law
C
Ohm’s Law
D
Coulomb’s Law
Answer/ Hint
14.
What is the value of current I_{4} (in A) for the given junction
A
4
B
-4
C
6
D
-6
Answer/ Hint
15.
What is the value of Norton resistance (in Ohm) between the terminal A and B for the given Norton’s equivalent circuit
A
2
B
4
C
4.66
D
5.6
Answer/ Hint
16.
Determine the value of current (in A) through both the resistors of the given circuit
A
– 2, – 1.5
B
2, 1.5
C
– 2, 1.5
D
2, – 1.5
Answer/ Hint
17.
The SI unit of magnetic flux is __________
A
Henry
B
Coulomb
C
Tesla
D
Weber
Answer/ Hint
18.
The relative permeability of diamagnetic materials is _________ .
A
Greater than 1
B
Greater than 10
C
Less than 1
D
Less than 10
Answer/ Hint
19.
Which of the following is the reciprocal of reluctance
A
Permeability
B
Susceptibility
C
Permeance
D
Reluctivity
Answer/ Hint
20.
Which of the following is the CORRECT formula for permeance
A
B
C
D
Answer/ Hint
21.
Determine the intensity of magnetization (in A/m) of a magnet when it has a pole strength of 60 A-m and a pole area of 20 sq. m
A
9
B
4
C
6
D
3
Answer/ Hint
22.
What will be the magnitude of induced EMF (in V) in a coil that has 200 square loops, each of side 5 cm and placed normal to a magnetic field ? The magnetic field increases at the rate of 4 Weber per sq. meter.
A
1
B
2
C
3
D
4
Answer/ Hint
23.
What will be the value of current (in A) in a 40 cm long solenoid in free space, if it has 400 turns, 2 cm of diameter and produces a magnetic field of 4 mT at its centre
A
4.23
B
5.15
C
3.18
D
2.34
Answer/ Hint
24.
What will be the self-inductance (in H) of a 2 m long air-core solenoid, if the diameter of the solenoid is 25 cm and has 600 turns
A
0.011
B
0.045
C
0.132
D
0.645
Answer/ Hint
25.
What will be the mutual inductance (in mH) between the two coils. If a current of 2 sin (100 t) passes through one of the coil, which induces a maximum EMF of 10V in the second coil
A
40
B
20
C
50
D
60
Answer/ Hint
26.
Determines the magnitude of the EMF (in V) induced between the axis of rotation and the rim of the disc, when the disc of diameter 40 cm rotates with an angular velocity of 40 revolutions per second and placed in a magnetic field of 1 T acting parallel to the rotation of the disc
A
0
B
10
C
14.14
D
17.32
Answer/ Hint
27.
What is the peak value of the alternating voltage (in V) having an average value of 180 V
A
254.59
B
282.57
C
333.34
D
359.96
Answer/ Hint
28.
The capacitive reactance of a circuit is 60 Ohms, when it is supplied with a 50 Hz supply. What will be the value of capacitive reactance (in Ohms) of the same circuit, if it is supplied with a 60 Hz supply
A
50
B
60
C
75
D
125
Answer/ Hint
29.
A parallel RLC circuit is being supplied by a DC source as shown in the figure below. What is the value of current flowing through the capacitor (in A)
A
0
B
0.5
C
1
D
2
Answer/ Hint
30.
Calculate the value of phase angle (in Degrees) in a series RC circuit having a resistance of 50 Ohms and a capacitive reactance of 86.6 Ohms, when supplied with a frequency of 50 Hz
A
15
B
30
C
45
D
60
Answer/ Hint
31.
What is the value of the total impedance (in Ohms) of a tank circuit working at resonant frequency having a capacitance of 0.01 mF and an inductance of 0.01 mH
A
0
B
10
C
100
D
∞
Answer/ Hint
32.
Calculate the time (in seconds) taken by a series RL circuit having inductance of 0.6 H and resistance of 30 Ohms to each a steady state value
A
0.02
B
0.05
C
0.1
D
0.5
Answer/ Hint
33.
Which of the following is NOT correct about a star connected balanced 3-phase circuit
A
The phase current is equal to the line current.
B
The phase voltage is less than the line voltage.
C
The system does not contain a neutral point.
D
It is a four wire system.
Answer/ Hint
34.
A 3-phase delta connected system is supplied by a line voltage of 400 V. the value of phase current is 70 A. what is the power (in kW) consumed by the system, if the current lags the voltage by 60 degrees
A
16.8
B
42
C
67.2
D
84
Answer/ Hint
35.
What is the apparent power of a 3-phase star connected system having a line voltage of 250 V and a line current of 40 A and the phase difference between the voltage and current is 36.87 degrees
A
13.856 kW
B
13.856 kVA
C
17.32 kW
D
17.32 kVA
Answer/ Hint
36.
Which of the following is the dimension of resistance
A
B
C
D
Answer/ Hint
37.
A factory runs in 3 shifts of 8 hours each, in which it consumes 30 kW, 15 kW and 25 kW in each shift respectively. calculate the energy (in kWh) consumed by the factory per day
A
186.67
B
373
C
560
D
746.67
Answer/ Hint
38.
In 2 wattmeter method of power Calculation of a 3-phase balanced star connected system, what is the power factor of the system if one of the wattmeter shows zero reading and the other shows a positive reading
A
0
B
Greater than 0 but less than 0.5
C
0.5
D
Greater than 005 but less than 1
Answer/ Hint
39.
Which of the following is NOT an advantage of PMMC type instruments
A
Frictional error is low
B
Single instrument can be used for multi range measurements of voltage and current
C
Uniformly divided scale.
D
Stray magnetic field error is small
Answer/ Hint
40.
Which of the following quantities cannot be measured using a multi-meter
A
AC voltage
B
DC current
C
Phase Angle
D
Resistance
Answer/ Hint
41.
Which of the following can measure the resistance having value below 1 Ohms most precisely
A
Kelvin’s Double Bridge
B
Megger
C
Multi-meter
D
Wheatstone Bridge
Answer/ Hint
42.
Which of the following materials when used as the viewing surface of a CRO given a bluish glow
A
Zinc Sulphide with copper as impurity
B
Zinc Sulphide with silver as impurity
C
Yttrium Oxide
D
Pure Zinc Sulphide
Answer/ Hint
43.
What is the percentage voltage error of a potential transformer with system voltage of 11,000 V and having turns ratio of 100, if the measured secondary side voltage is 105 V
A
2.75
B
3.55
C
4.54
D
9.09
Answer/ Hint
44.
Which of the following is the cause of a speed error in induction type energy meter
A
Incorrect position of brake magnets.
B
Incorrect adjustment of the position of shading bands.
C
Slow but continuous rotation of aluminium disc.
D
Temperature variations
Answer/ Hint
45.
A circuit having power factor of 0.8 consumes 20 W. what is the value of reactive power (in VAR) of the circuit
A
10
B
15
C
20
D
25
Answer/ Hint
46.
During plugging, external resistance is also introduced into a circuit to limit the flowing _________ .
A
Current
B
Voltage
C
Current and voltage both
D
None of these
Answer/ Hint
47.
A Transformer
A
Changes AC to DC
B
Changes DC to AC
C
Steps up or down DC Voltages & Current.
D
Steps up or down AC Voltages & Current.
Answer/ Hint
48.
The overall power factor of an On-load transformer ________ .
A
Depends on the power factor of the load.
B
Is always lagging.
C
Is always unity.
D
Is always leading
Answer/ Hint
49.
Dynamic braking can be used for which of the following
A
Shunt motors
B
Series motors
C
Compound motors
D
All options are correct
Answer/ Hint
50.
The parts of the armature electric circuit which take active part in emf generation are ________
A
The coil sides inside the slots
B
The overhangs
C
Both The coil sides inside the slots and The overhangs
D
The commutator segments
Answer/ Hint
51.
The inter-poles in dc machines have a tapering shape in order to
A
Reduce the overall weight
B
Reduce the saturation in the inter-pole
C
Economise on the material required for inter-poles
D
Increase the acceleration commutation
Answer/ Hint
52.
Maximum efficiency will occur, when copper loss and iron loss are
A
Unity
B
Zero
C
Unequal
D
Equal
Answer/ Hint
53.
The higher the voltage in the transmission line, the current which flow through the transmission line for a given power to be transmitted will be
A
Higher
B
Equal
C
Lower
D
Unity
Answer/ Hint
54.
No-load test on induction motor is conducted to find which of the following losses
A
Stator core loss
B
Rotational loss
C
Stator copper loss
D
All options are correct
Answer/ Hint
55.
If the torque of the induction motor decreases, the _________
A
Speed of rotor increases
B
Speed of rotor decreases
C
Current of the rotor decreases
D
Power of the motor decreases
Answer/ Hint
56.
Reduction in the capacitance of a capacitor-start motor results in reduced ________.
A
Noise
B
Speed
C
Starting torque
D
Armature reaction
Answer/ Hint
57.
A single-phase induction motor with only the main winding excited would exhibit the following response at synchronous speed
A
Rotor current is zero
B
Rotor current is non-zero is at slip frequency
C
Forward and backward rotating fields are equal
D
Forward rotating field is more than the backward rotating field
Answer/ Hint
58.
The electric motor used in portable drills is ________ .
A
Capacitor run motor
B
Hysteresis motor
C
Universal motor
D
Repulsion motor
Answer/ Hint
59.
In which single-phase motor, the rotor has no teeth or winding
A
Split phase motor
B
Reluctance motor
C
Hysteresis motor
D
Universal motor
Answer/ Hint
60.
The range of efficiency for shaded pole motors is
A
95% to 99%
B
80% to 90%
C
50% to 75%
D
5% to 35%
Answer/ Hint
61.
The direction of rotation of universal motor can be reversed by reversing the flow of current through __________
A
Armature winding
B
Field winding
C
Either Armature winding or Field winding
D
None of these
Answer/ Hint
62.
Which of the following statement is incorrect
A
As the temperature rises, the tension in the transmission line decreases
B
As temperature rises, the sag in transmission line reduces
C
Tension and sag in transmission lines are complementary to each other
D
None of these
Answer/ Hint
63.
Series capacitors in transmission lines are of little use when
A
The load VAR requirement is small
B
The load VAR requirement is large
C
The load VAR requirement is fluctuating
D
None of these
Answer/ Hint
64.
Stability of a system is not affected by ________ .
A
Reactance of line
B
Losses
C
Reactance of generator
D
Output torque
Answer/ Hint
65.
Which of the following is not a constituent for making porcelain insulators
A
Silica
B
Kaolin
C
Feldspar
D
Quartz
Answer/ Hint
66.
Name the generating station where electrical energy is generated through steam
A
Thermal power station
B
Diesel power station
C
Hydro power station
D
Nuclear power station
Answer/ Hint
67.
In a 3-phase 4-wire cable, the cross-sectional area of neutral conductor is
A
Equal to phase conductor
B
More than phase conductor
C
Half the phase conductor
D
None of these
Answer/ Hint
68.
Fuse is always made up of alloys and metals having
A
High resistance and high melting points
B
High resistance and Low melting points
C
Low resistance and Low melting points
D
Low resistance and High melting points
Answer/ Hint
69.
In case of stair case wiring which type of switch is used
A
2 one way switches
B
1 one way switch
C
2 two way switch
D
1 two way switch
Answer/ Hint
70.
Two incandescent lamps of wattage 40W, 60W are connected in series with voltage of 230 V. which out of the two lamps will glow brighter
A
40 W
B
60 W
C
Both brightly
D
Both dim
Answer/ Hint
71.
Rating of fuse wire is expressed in terms of ________ .
A
Ohms
B
Mhos
C
Amperes
D
Watts
Answer/ Hint
72.
A 3-phase, 4-wire system is commonly used on ________
A
Primary transmission
B
Secondary transmission
C
Primary distribution
D
Secondary distribution
Answer/ Hint
73.
Insulator that is used in low voltage distribution lines is known as ________
A
Shackle
B
Strain
C
Pin
D
Suspension
Answer/ Hint
74.
Which of the following type of lamp gives more illumination from low wattage
A
Incandescent lamp
B
Fluorescent lamp
C
Compact Fluorescent lamp
D
LED lamp
Answer/ Hint
75.
The fuse is installed in which of the following wire
A
Neutral
B
Phase
C
Earth
D
All options are correct
Answer/ Hint
76.
The wave form of the armature m.m.f. in DC machine is ________ .
A
Square
B
Rectangular
C
Triangular
D
Sinusoidal
Answer/ Hint
77.
Light waves travel with a velocity of _________
A
3 × 10^{10} cm/s
B
3 × 10^{12} cm/s
C
3 × 10^{15} cm/s
D
3 × 10^{18} cm/s
Answer/ Hint
78.
Light is produced in electric discharge lamps by _________
A
Heating effect of current
B
Magnetic effect of current
C
Ionisation in a gas or vapour
D
Carbon electrodes
Answer/ Hint
79.
A DC generator can be termed as _________
A
Rotating amplifier
B
Prime mover
C
Power pump
D
None of these
Answer/ Hint
80.
Which of the following has the highest value of thermal conductivity
A
Aluminium
B
Brass
C
Copper
D
Iron
Answer/ Hint
81.
During resistance welding heat produced at the joint is proportional to _________
A
Current
B
Voltage
C
I^{2} R
D
Volt-amperes
Answer/ Hint
82.
Which of the following is tetravalent
A
Quartz
B
Diamond
C
Germanium
D
Antimony
Answer/ Hint
83.
The acceptor type of impurity is _________ .
A
Phosphorous
B
Aluminium
C
Boron
D
Iron
Answer/ Hint
84.
The reverse bias characteristics of a semiconductor diode is shown in
Figure
Figure
Figure
Figure
A
I
B
II
C
III
D
IV
Answer/ Hint
85.
The peak inverse voltage, in case of a bridge rectifier, for each, diode is : (where, E_{m} = peak value of input voltage)
A
E_{m} .
B
2E_{m} .
C
3E_{m} .
D
4E_{m} .
Answer/ Hint
86.
In an electronic circuit transistor is used for switching ON and OFF a relay, when the transistor switches OFF the relay, a higher voltage appears across the transistor. How can a transistor be protected from this voltage
A
A capacitor in series to the relay
B
A resistor in series to the relay
C
An inductor parallel to the relay
D
A diode parallel to the relay
Answer/ Hint
87.
The efficiency of the class B amplifier is approximately
A
10% to 30%
B
30% to 50%
C
50% to 60%
D
70% to 100%
Answer/ Hint
88.
The oscillations in a synchronous motor can be damped out by
A
Maintaining constant excitation
B
Providing damper bars in the rotor pole faces
C
Running the motor on leading power factors
D
Oscillations cannot be damped
Answer/ Hint
89.
An over excited synchronous motor is used for _________ .
A
Variable speed loads
B
Low torque loads
C
Power factor corrections
D
High torque loads
Answer/ Hint
90.
Synchronous motors are ________ .
A
Essentially self-starting
B
Not-self starting
C
Self-starting
D
None of these
Answer/ Hint
91.
The under-excited synchronous motor takes ________ .
A
Leading current
B
Lagging current
C
Both Leading current and Lagging current
D
None of these
Answer/ Hint