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All Electrical Engineering MCQs

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

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881Electrical EngineeringMedium

While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?

ABraking

BEfficiency

CStarting characteristics

DRunning characteristics

Correct answer

A. Braking

Explanation

The correct answer is Braking.

882Electrical EngineeringMedium

Wire-wound resistors are unsuitable for use at high frequencies because they________?

Aare likely to melt under excessive eddy current heat

Bcreate more electrical noise

Cexhibit unwanted inductive and capacitive effects

Dconsume more power

Correct answer

C. exhibit unwanted inductive and capacitive effects

Explanation

The correct answer is exhibit unwanted inductive and capacitive effects.

883Electrical EngineeringMedium

Selenium becomes a conductor in light so it behaves like________?

ALight emitting diode

BSemiconductor

CPhotodiode

DCapacitor

Correct answer

C. Photodiode

Explanation

The correct answer is Photodiode.

884Electrical EngineeringMedium

Velocity error constant of a system is measured when the input to the system is unit ________ function?

Aimpulse

Bstep

Cramp

Dparabolic

Correct answer

C. ramp

Explanation

The correct answer is ramp.

885Electrical EngineeringMedium

The net armature voltage of a synchronous motor is equal to the________?

Avector difference of Eh and V

Barithmetic sum of Eb and V

Carithmetic difference of Eb and V

Dvector sum of Eb and V

Correct answer

A. vector difference of Eh and V

Explanation

The correct answer is vector difference of Eh and V.

886Electrical EngineeringMedium

Kirchhoff s current law states that

Atotal sum of currents meeting at the junction is zero

BHebraic sum of the currents meeting at the junction is zero

Cno current can leave the junction without some current entering it.

Dnet current flow at the junction is positive

Correct answer

B. Hebraic sum of the currents meeting at the junction is zero

Explanation

The correct answer is Hebraic sum of the currents meeting at the junction is zero.

887Electrical EngineeringMedium

In capacitor start single-phase motors________?

Anone of the above

Bcurrent in the starting winding leads the voltage

Ccurrent in the starting winding lags the voltage

Dcurrent in the starting winding is in phase with voltage in running winding

Correct answer

B. current in the starting winding leads the voltage

Explanation

The correct answer is current in the starting winding leads the voltage.

888Electrical EngineeringMedium

In a capacitor start motor, the phase displacement between starting and running winding can be nearly________?

A30°

B90°

C60°

D10°

Correct answer

B. 90°

Explanation

The correct answer is 90°.

889Electrical EngineeringMedium

In Rankine cycle the work output from the turbine is given by________?

Achange of internal energy between inlet and outlet

Bchange of temperature between inlet and outlet

Cchange of enthaply between inlet and outlet

Dchange of entropy between inlet and outlet

Correct answer

C. change of enthaply between inlet and outlet

Explanation

The correct answer is change of enthaply between inlet and outlet.

890Electrical EngineeringMedium

If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is________?

A20V

B100V

C10V

D1V

Correct answer

C. 10V

Explanation

The correct answer is 10V.

Wire-wound resistors are unsuitable for use at high frequencies because they________?

Aare likely to melt under excessive eddy current heat

Bcreate more electrical noise

Cexhibit unwanted inductive and capacitive effects

Dconsume more power

Correct answer

C. exhibit unwanted inductive and capacitive effects

Explanation

The correct answer is exhibit unwanted inductive and capacitive effects.

Kirchhoff s current law states that

Atotal sum of currents meeting at the junction is zero

BHebraic sum of the currents meeting at the junction is zero

Cno current can leave the junction without some current entering it.

Dnet current flow at the junction is positive

Correct answer

B. Hebraic sum of the currents meeting at the junction is zero

Explanation

The correct answer is Hebraic sum of the currents meeting at the junction is zero.

In capacitor start single-phase motors________?

Anone of the above

Bcurrent in the starting winding leads the voltage

Ccurrent in the starting winding lags the voltage

Dcurrent in the starting winding is in phase with voltage in running winding

Correct answer

B. current in the starting winding leads the voltage

Explanation

The correct answer is current in the starting winding leads the voltage.

In Rankine cycle the work output from the turbine is given by________?

Achange of internal energy between inlet and outlet

Bchange of temperature between inlet and outlet

Cchange of enthaply between inlet and outlet

Dchange of entropy between inlet and outlet

Correct answer

C. change of enthaply between inlet and outlet

Explanation

The correct answer is change of enthaply between inlet and outlet.