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All Electrical Engineering MCQs

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

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1081Electrical EngineeringMedium

Pipes carrying steam are generally made up of________?

Asteel

Bcopper

Caluminium

Dcast iron

Correct answer

A. steel

Explanation

The correct answer is steel.

1082Electrical EngineeringMedium

The unit of resistivity is

AΩ – metre.

BΩ / m².

CΩ.

Correct answer

A. Ω – metre.

Explanation

The correct answer is Ω – metre..

1083Electrical EngineeringMedium

Charging of sulfated battery produces ________ heat

Amore

Bvery little

Cless

Dno

Correct answer

A. more

Explanation

The correct answer is more.

1084Electrical EngineeringMedium

The differential gain is ________?

Adependent on input voltage

Bvery high

Cabout 100

Dvery low

Correct answer

B. very high

Explanation

The correct answer is very high.

1085Electrical EngineeringMedium

The h parameter approach gives correct results for________?

ANone of the above

BLarge signals only

CBoth small and large signals

DSmall signals only

Correct answer

D. Small signals only

Explanation

The correct answer is Small signals only.

1086Electrical EngineeringMedium

Temporary magnets are used in________?

Amotors

Ball of the above

Cloud-speakers

Dgenerators

Correct answer

B. all of the above

Explanation

The correct answer is all of the above.

1087Electrical EngineeringMedium

In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

AZero

BSwitches between 0 and + 1

CSwitches between – 1 / 2 and + 1 / 2

DSwitches between – 1 and + 1

Correct answer

C. Switches between – 1 / 2 and + 1 / 2

Explanation

The correct answer is Switches between – 1 / 2 and + 1 / 2.

1088Electrical EngineeringMedium

The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?

Aincrease or decrease depending upon the exit quality of steam

Bno change in exit velocity from the nozzle

Cincrease in exit velocity from the nozzle

Ddecrease in exit velocity from the nozzle

Correct answer

D. decrease in exit velocity from the nozzle

Explanation

The correct answer is decrease in exit velocity from the nozzle.

1089Electrical EngineeringMedium

The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator?

Aeddy current loss

Bhysteresis loss

Cfield copper loss

Darmature copper loss

Correct answer

D. armature copper loss

Explanation

The correct answer is armature copper loss.

1090Electrical EngineeringMedium

Capacitive reactance is more when________?

Acapacitance is less and frequency of supply is more

Bcapacitance is more and frequency of supply is less

Ccapacitance is more and frequency of supply is more

Dcapacitance is less and frequency of supply is less

Correct answer

D. capacitance is less and frequency of supply is less

Explanation

The correct answer is capacitance is less and frequency of supply is less.

The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?

Aincrease or decrease depending upon the exit quality of steam

Bno change in exit velocity from the nozzle

Cincrease in exit velocity from the nozzle

Ddecrease in exit velocity from the nozzle

Correct answer

D. decrease in exit velocity from the nozzle

Explanation

The correct answer is decrease in exit velocity from the nozzle.

Capacitive reactance is more when________?

Acapacitance is less and frequency of supply is more

Bcapacitance is more and frequency of supply is less

Ccapacitance is more and frequency of supply is more

Dcapacitance is less and frequency of supply is less

Correct answer

D. capacitance is less and frequency of supply is less

Explanation

The correct answer is capacitance is less and frequency of supply is less.