Electrical MCQ with Answer
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Question 81
The rotor of 3 phase induction motor always runs at
(a) Synchronous speed
(b) Less than synchronous speed
(c) More than synchronous speed
(d) None of the above
The correct answer is (b) Less than synchronous
Question 82
Working cycles of air conditioner is measured in
(a) Domestic refrigerator
(b) Water cooler
(c) Both (a) and (b)
(d) None of the above
The correct answer is (c) – Both (a) and (b)
Question 83
Megger is used for measuring
(a) Low resistance
(b) High resistance
(c) Medium resistance
(d) Very low resistance
The correct answer is (b) High resistance
Question 84
Megger can be used of testing
(a) Open circuit
(b) Short circuit
(c) Open and short circuit both
(d) High resistance circuit only
The correct answer is (c) Open and short circuit both
Question 85
The efficiency of 3 phase transmission as compared to single phase transmission is
(a) Lower
(b) Higher
(c) Same
(d) None of the above
The correct answer is (b) Higher
Question 86
The meter of multimeter will work on
(a) DC supply
(b) AC supply
(c) AC and DC both
(d) Half wave rectified AC
The correct answer is (a) DC supply
Question 87
Transformer is a
(a) Rotating device
(b) Static device
(c) Electrostatic device
(d) Magnetic device
The correct answer is (b) Static device
Question 88
The rotor of alternator (synchronous generator) has how many slip rings
(a) Four slip rings
(b) Three slip rings
(c) Two slip rings
(d) No slip ring
The correct answer is (c) Two slip rings
Question 89
Alternator works on the principle of
(a) Mutual induction
(b) Faraday’s laws of electro magnetic induction
(c) Self induction
(d) Self and mutual induction
The correct answer is (a) Mutual induction
Question 90
Under running condition on load the angle between induced voltage and supply voltage will be
(a) 0°
(b) 180°
(c) Between 90° and 180°
(d) Between 0° and 90°
The correct answer is (d) Between 0° and 90°
Question 91
The input to an AC circuit is 10 KVA at 0.6 power factor lagging, the power drawn by the circuit in KW will be
(a) 6
(b) 12
(c) 8
(d) 16
The correct answer is (a) 6
Question 92
An alternating current has the following values for half cycle current in amp 0, 2, 3, 5, 8, 5, 3, 2, 0. Its average vale will be
(a) 5.5 amp
(b) 85 amp
(c) 46 amp
(d) 4.6 amp
The correct answer is (d) 4.6 amp
Question 93
The frequency of EMF generated depends upon
(a) Speed of the alternator
(b) Number of poles of the alternator
(c) Type of alternator
(d) (a) and (b) both
The correct answer is (d) (a) and (b) both
Question 94
For long transmission lines, voltage is measured in
(a) Volts
(b) Mirco Volts
(c) Kilo Volts
(d) Milli Volts
The correct answer is (c) Kilo Volts
Question 95
Active elements in lead Acid battery is
(a) Sulphuric Acid
(b) Caustic Potash
(c) Magnese Dioxide
(d) Nitric Acid
The correct answer is (b) Caustic Potash
Question 96
With the increases in temperature, the resistance of copper
(a) Decreases
(b) Increases
(c) Become zero
(d) Remains constant
The correct answer is (b) Increases
Question 97
Multimeter can measure
(a) Current
(b) Voltage
(c) Resistance
(d) All of the above
The correct answer is (d) All of the above
Question 98
The dynamometer type wattmeter is used on
(a) AC only
(b) DC only
(c) AC and DC both
(d) Full wave rectified AC
The correct answer is (c) AC and DC both
Question 99
External pressure is required for
(a) Arc Welding
(b) Spot Welding
(c) Hydrogen Welding
(d) Atomic Arc Welding
The correct answer is (b) Spot Welding