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

3451Electrical EngineeringMedium

Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will________?

Adepends upon composition of dielectric

Bdecrease

Cremain constant

Dincrease

Correct answer

B. decrease

Explanation

The correct answer is decrease.

3452Electrical EngineeringMedium

A good voltage regulation of a transformer means________?

Aoutput voltage fluctuation from no load to full load is least

Bdifference between primary and secondary voltage is least

Cdifference between primary and secondary voltage is maximum

Doutput voltage fluctuation with power factor is least

Correct answer

A. output voltage fluctuation from no load to full load is least

Explanation

The correct answer is output voltage fluctuation from no load to full load is least.

3453Electrical EngineeringMedium

The function of ferrite antenna is to________?

AReduce noise

BIncrease the Q of tuned circuit

CReduce stray capacitance

DStabilise d.c. bias

Correct answer

B. Increase the Q of tuned circuit

Explanation

The correct answer is Increase the Q of tuned circuit.

3454Electrical EngineeringMedium

The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is________?

A6 mH

B4 mH

C5 mH

D12 mH

Correct answer

A. 6 mH

Explanation

The correct answer is 6 mH.

3455Electrical EngineeringMedium

Paper capacitors usually have a tolerance of________?

A± 10%

B± 20%

C± 5%

D± 15%

Correct answer

A. ± 10%

Explanation

The correct answer is ± 10%.

3456Electrical EngineeringMedium

The electric motor used in portable drills is________?

Ahysteresis motor

Buniversal motor

Crepulsion motor

Dcapacitor run motor

Correct answer

B. universal motor

Explanation

The correct answer is universal motor.

3457Electrical EngineeringMedium

In congested areas where excavation is expensive and inconvenient ‘draw in system’ of laying of underground cables is often adopted

ANo

BYes

Correct answer

B. Yes

Explanation

The correct answer is Yes.

3458Electrical EngineeringMedium

The direction of electric field due +0 positive charge is ________?

Aaway from the charge

Bboth A. and (6)

Cnone of the above

Dtowards the charge

Correct answer

A. away from the charge

Explanation

The correct answer is away from the charge.

3459Electrical EngineeringMedium

The man made noise sources is / are________?

AAll of these

BSwitches, radio interferences

CMotors

DComputers, digital electronics

Correct answer

A. All of these

Explanation

The correct answer is All of these.

3460Electrical EngineeringMedium

Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become________?

A4 times of its original value

B1/8th of its original value

C1/4th of its original value

D8 times of its original value

Correct answer

A. 4 times of its original value

Explanation

The correct answer is 4 times of its original value.

A good voltage regulation of a transformer means________?

Aoutput voltage fluctuation from no load to full load is least

Bdifference between primary and secondary voltage is least

Cdifference between primary and secondary voltage is maximum

Doutput voltage fluctuation with power factor is least

Correct answer

A. output voltage fluctuation from no load to full load is least

Explanation

The correct answer is output voltage fluctuation from no load to full load is least.