Study mode · no timer

All Electrical Engineering MCQs

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

Answers and explanations are always visible Take this quiz

601Electrical EngineeringMedium

For the same draught produced the power of induced draught fan as compared to forced draught fan is________?

Amore

Bsame

Cnot predictable

Dless

Correct answer

A. more

Explanation

The correct answer is more.

602Electrical EngineeringMedium

An electric field can deflect________?

ABoth glass rod and silk acquire a negative charge

BNone

CNeutrons

DX-rays

Correct answer

B. None

Explanation

The correct answer is None.

603Electrical EngineeringMedium

power plant is expected to have the longest life?

AHydroelectric

BAny of the above

CSteam

DDiesel

Correct answer

A. Hydroelectric

Explanation

The correct answer is Hydroelectric.

604Electrical EngineeringMedium

In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

AAll of these

B11

Correct answer

A. All of these

Explanation

The correct answer is All of these.

605Electrical EngineeringMedium

The conduction of electricity, in semiconductors, takes place due to movement of________?

Anegative ions only

Bpositive and negative ions

Celectrons and holes

Dpositive ions only

Correct answer

C. electrons and holes

Explanation

The correct answer is electrons and holes.

606Electrical EngineeringMedium

Basically a potentiometer is a device for________?

Ameasuring a current

Bmeasuring a voltage

Ccomparing two currents

Dnone of the above

Ecomparing two voltages

Correct answer

E. comparing two voltages

Explanation

The correct answer is comparing two voltages.

607Electrical EngineeringMedium

The information to the circuit breaker under fault conditions is provided by________?

AH.R.C. only

Brewirable fuse

Call of the above

Drelay

Correct answer

D. relay

Explanation

The correct answer is relay.

608Electrical EngineeringMedium

The typical time of rising time lies between________?

A90 – 100 µs

B1 – 4 µs

C10 – 20 µs

D40 – 60 µs

Correct answer

B. 1 – 4 µs

Explanation

The correct answer is 1 – 4 µs.

609Electrical EngineeringMedium

Self inductance of a coil depends upon________?

Avoltage produce

Bnumber of turns per unit length

Ccurrent flowing

Dall

Correct answer

D. all

Explanation

The correct answer is all.

610Electrical EngineeringMedium

In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be________?

A1500 r.p.m.

Bnone of the above

C3000 r.p.m.

D750 r.p.m.

Correct answer

A. 1500 r.p.m.

Explanation

The correct answer is 1500 r.p.m..

601Electrical EngineeringMedium

For the same draught produced the power of induced draught fan as compared to forced draught fan is________?

Amore

Bsame

Cnot predictable

Dless

Correct answer

A. more

Explanation

The correct answer is more.

602Electrical EngineeringMedium

An electric field can deflect________?

ABoth glass rod and silk acquire a negative charge

BNone

CNeutrons

DX-rays

Correct answer

B. None

Explanation

The correct answer is None.

603Electrical EngineeringMedium

power plant is expected to have the longest life?

AHydroelectric

BAny of the above

CSteam

DDiesel

Correct answer

A. Hydroelectric

Explanation

The correct answer is Hydroelectric.

604Electrical EngineeringMedium

In a 3 phase CSI, if the required line output voltages are balanced and 120 degree out of phase, then the chopping angles are used to eliminate only the harmonics at frequencies

AAll of these

B11

Correct answer

A. All of these

Explanation

The correct answer is All of these.

605Electrical EngineeringMedium

The conduction of electricity, in semiconductors, takes place due to movement of________?

Anegative ions only

Bpositive and negative ions

Celectrons and holes

Dpositive ions only

Correct answer

C. electrons and holes

Explanation

The correct answer is electrons and holes.

606Electrical EngineeringMedium

Basically a potentiometer is a device for________?

Ameasuring a current

Bmeasuring a voltage

Ccomparing two currents

Dnone of the above

Ecomparing two voltages

Correct answer

E. comparing two voltages

Explanation

The correct answer is comparing two voltages.

607Electrical EngineeringMedium

The information to the circuit breaker under fault conditions is provided by________?

AH.R.C. only

Brewirable fuse

Call of the above

Drelay

Correct answer

D. relay

Explanation

The correct answer is relay.

608Electrical EngineeringMedium

The typical time of rising time lies between________?

A90 – 100 µs

B1 – 4 µs

C10 – 20 µs

D40 – 60 µs

Correct answer

B. 1 – 4 µs

Explanation

The correct answer is 1 – 4 µs.

609Electrical EngineeringMedium

Self inductance of a coil depends upon________?

Avoltage produce

Bnumber of turns per unit length

Ccurrent flowing

Dall

Correct answer

D. all

Explanation

The correct answer is all.

610Electrical EngineeringMedium

In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be________?

A1500 r.p.m.

Bnone of the above

C3000 r.p.m.

D750 r.p.m.

Correct answer

A. 1500 r.p.m.

Explanation

The correct answer is 1500 r.p.m..