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All Electrical Engineering MCQs

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

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781Electrical EngineeringMedium

The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?

A110k

B10k

C120k

Correct answer

A. 110k

Explanation

The correct answer is 110k.

782Electrical EngineeringMedium

Iron losses in a D.C. machine are independent of variations in________?

Aspeed and voltage

Bload

Cvoltage

Dspeed

Correct answer

B. load

Explanation

The correct answer is load.

783Electrical EngineeringMedium

Lap winding is composed of________?

Aany odd number of conductors

Bany even number of conductors

Cthat even number which is exact multiple of poles

Dthat even number which is exact multiple of poles + 2

Correct answer

B. any even number of conductors

Explanation

The correct answer is any even number of conductors.

784Electrical EngineeringMedium

The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to?

ANone of the above

B68 W

C6 W

D2 W

Correct answer

B. 68 W

Explanation

The correct answer is 68 W.

785Electrical EngineeringMedium

Bidirectional semiconductor device is________?

ATRIAC

BDiode

CSCR

DBJT

Correct answer

A. TRIAC

Explanation

The correct answer is TRIAC.

786Electrical EngineeringMedium

Which of the following is expected to have the maximum permeability?

AEbonite

BBrass

CCopper

DZinc

Correct answer

A. Ebonite

Explanation

The correct answer is Ebonite.

787Electrical EngineeringMedium

When an SCR is turned on, the voltage across it is about ________?

A10 V

B1 V

CZero

Correct answer

B. 1 V

Explanation

The correct answer is 1 V.

788Electrical EngineeringMedium

A carrier based PWM technique in CSI is composed of________?

AA switching and shorting pulse combination

BAll of these

CA shorting pulse distributor

DA switching pulse generator and a shorting pulse generator

Correct answer

B. All of these

Explanation

The correct answer is All of these.

789Electrical EngineeringMedium

The primary reason for low power factor is supply system is due to installation of________?

Asynchronous motors

Binduction motors

Cd.c. motors

Dsingle phase motors

Correct answer

B. induction motors

Explanation

The correct answer is induction motors.

790Electrical EngineeringMedium

The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as________?

AInterference

BElectromagnetic compatibility

CSusceptibility

DEmission

Correct answer

B. Electromagnetic compatibility

Explanation

The correct answer is Electromagnetic compatibility.

781Electrical EngineeringMedium

The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?

A110k

B10k

C120k

Correct answer

A. 110k

Explanation

The correct answer is 110k.

782Electrical EngineeringMedium

Iron losses in a D.C. machine are independent of variations in________?

Aspeed and voltage

Bload

Cvoltage

Dspeed

Correct answer

B. load

Explanation

The correct answer is load.

783Electrical EngineeringMedium

Lap winding is composed of________?

Aany odd number of conductors

Bany even number of conductors

Cthat even number which is exact multiple of poles

Dthat even number which is exact multiple of poles + 2

Correct answer

B. any even number of conductors

Explanation

The correct answer is any even number of conductors.

784Electrical EngineeringMedium

The power output of an audio system is 18 W. For a person to notice an increase in the output (loudness or sound intensity) of the system, what must the output power be increased to?

ANone of the above

B68 W

C6 W

D2 W

Correct answer

B. 68 W

Explanation

The correct answer is 68 W.

785Electrical EngineeringMedium

Bidirectional semiconductor device is________?

ATRIAC

BDiode

CSCR

DBJT

Correct answer

A. TRIAC

Explanation

The correct answer is TRIAC.

786Electrical EngineeringMedium

Which of the following is expected to have the maximum permeability?

AEbonite

BBrass

CCopper

DZinc

Correct answer

A. Ebonite

Explanation

The correct answer is Ebonite.

787Electrical EngineeringMedium

When an SCR is turned on, the voltage across it is about ________?

A10 V

B1 V

CZero

Correct answer

B. 1 V

Explanation

The correct answer is 1 V.

788Electrical EngineeringMedium

A carrier based PWM technique in CSI is composed of________?

AA switching and shorting pulse combination

BAll of these

CA shorting pulse distributor

DA switching pulse generator and a shorting pulse generator

Correct answer

B. All of these

Explanation

The correct answer is All of these.

789Electrical EngineeringMedium

The primary reason for low power factor is supply system is due to installation of________?

Asynchronous motors

Binduction motors

Cd.c. motors

Dsingle phase motors

Correct answer

B. induction motors

Explanation

The correct answer is induction motors.

790Electrical EngineeringMedium

The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as________?

AInterference

BElectromagnetic compatibility

CSusceptibility

DEmission

Correct answer

B. Electromagnetic compatibility

Explanation

The correct answer is Electromagnetic compatibility.