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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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681Electrical EngineeringMedium

In case the air gap in an induction motor is increased________?

Athe windage losses will increase

Bthe magnetising current of the rotor will decrease

Cspeed of motor will increase

Dthe power factor will decrease

Correct answer

D. the power factor will decrease

Explanation

The correct answer is the power factor will decrease.

682Electrical EngineeringMedium

Slip of an induction motor is negative when________?

Anone of the above

Brotor speed is more than the synchronous speed of the field and are in the same direction

Crotor speed is less than the synchronous speed of the field and are in the same direction

Dmagnetic field and rotor rotate in opposite direction

Correct answer

B. rotor speed is more than the synchronous speed of the field and are in the same direction

Explanation

The correct answer is rotor speed is more than the synchronous speed of the field and are in the same direction.

683Electrical EngineeringMedium

Which of the following machines has heavy fluctuation of load?

ALathe

BPunching machine

CPlaner

DPrinting machine

Correct answer

B. Punching machine

Explanation

Punching machines impose sudden, intermittent mechanical loads and therefore produce heavy load fluctuations.

684Electrical EngineeringMedium

The thickness of laminations used in a transformer is usually________?

A25 mm to 40 mm

B4 mm to 5 mm

C0.4 mm to 0.5 mm

D14 mm to 15 mm

Correct answer

C. 0.4 mm to 0.5 mm

Explanation

The correct answer is 0.4 mm to 0.5 mm.

685Electrical EngineeringMedium

The intersheaths in the cables are used to________?

Aprovide proper stress distribution

Bnone of the above

Cavoid the requirement of good insulation

Dminimize the stress

Correct answer

A. provide proper stress distribution

Explanation

The correct answer is provide proper stress distribution.

686Electrical EngineeringMedium

Which of the following motors are pre-ferred for overhead travelling cranes?

AContinuous duty motors

BShort time rated motors

CSlow speed motors

DNone of the above

Correct answer

B. Short time rated motors

Explanation

The correct answer is Short time rated motors.

687Electrical EngineeringMedium

Which of the following is an essential part of a motor meter?

AAn operating torque system

BRevolution registering device

CAll of the above

DA braking device

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.

688Electrical EngineeringMedium

In a mercury arc rectifier________ flow from anode to cathode

Aany of the above

Belectrons

Cions

Dions and electrons

Correct answer

C. ions

Explanation

The correct answer is ions.

689Electrical EngineeringMedium

In the above question, what is the power in sidebands?

A06 kW

B9 kW

C6 kW

D8 kW

Correct answer

A. 06 kW

Explanation

The correct answer is 06 kW.

690Electrical EngineeringMedium

To reduce short circuit fault currents are used________?

Aresistors

Bnone of the above

Ccapacitors

Dreactors

Correct answer

D. reactors

Explanation

The correct answer is reactors.

Slip of an induction motor is negative when________?

Anone of the above

Brotor speed is more than the synchronous speed of the field and are in the same direction

Crotor speed is less than the synchronous speed of the field and are in the same direction

Dmagnetic field and rotor rotate in opposite direction

Correct answer

B. rotor speed is more than the synchronous speed of the field and are in the same direction

Explanation

The correct answer is rotor speed is more than the synchronous speed of the field and are in the same direction.