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 test

81Electrical EngineeringMedium

In a three phase voltage source inverters________?

ABoth amplitude and phase is controllable

BOnly phase is controllable

CAmplitude, phase and frequency of voltages should always be controllable

DOnly amplitude of voltage is controllable

Correct answer

C. Amplitude, phase and frequency of voltages should always be controllable

Explanation

The correct answer is Amplitude, phase and frequency of voltages should always be controllable.

82Electrical EngineeringMedium

The load cycle for a motor driving a power press will be________?

Acontinuous but periodical

Bvariable load

Ccontinuous

Dintermittent and variable load

Correct answer

D. intermittent and variable load

Explanation

The correct answer is intermittent and variable load.

83Electrical EngineeringMedium

The number of electrons in one coulomb charge is equal to________?

A1.6 x 1019

B6.2 x 1021

C6.2 x 1018

D1.6 x 10-27

Correct answer

C. 6.2 x 1018

Explanation

The correct answer is 6.2 x 1018.

84Electrical EngineeringMedium

In which of the following applications D.C. series motor is invariably tried?

AMotor operation in A.C. or D.C

BStarter for a car

CDrive for a water pump

DFan motor

Correct answer

B. Starter for a car

Explanation

The correct answer is Starter for a car.

85Electrical EngineeringMedium

How can we protect SCR from thermal conditions ________?

AUse of snubber circuit.

BUsing heat sink.

CUsing equalizing circuit

DUsing CB and fuse.

Correct answer

B. Using heat sink.

Explanation

The correct answer is Using heat sink..

86Electrical EngineeringMedium

Maximum demand on a power plant is________?

Ainstantaneous maximum value of kVA supplied during a period

Bboth A. or B.

Cnone of the above

Dthe greatest of all “short time interval averaged” demand during a period

Correct answer

D. the greatest of all “short time interval averaged” demand during a period

Explanation

The correct answer is the greatest of all “short time interval averaged” demand during a period.

87Electrical EngineeringMedium

The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with________?

AFaraday’s law of electromagnetic

BGauss’s law

CNewton’s law

DFaraday’s law of electrolysis

Correct answer

D. Faraday’s law of electrolysis

Explanation

The correct answer is Faraday’s law of electrolysis.

88Electrical EngineeringMedium

D.C. series generator is used________?

Ato supply industrial load at constant voltage

Bto supply traction load

Cvoltage at the toad end of the feeder

Dfor none of the above purpose

Correct answer

C. voltage at the toad end of the feeder

Explanation

The correct answer is voltage at the toad end of the feeder.

89Electrical EngineeringMedium

Leakage current flows through the thyristor in________?

Aboth forward and reverse blocking mode

Bforward blocking mode

Cforward conduction mode

Dreverse blocking mode

Correct answer

A. both forward and reverse blocking mode

Explanation

The correct answer is both forward and reverse blocking mode.

90Electrical EngineeringMedium

Which of the following circuit breakers has high reliability and minimum maintenance?

AAir blast circuit breakers

BVacuum circuit breakers

CCircuit breaker with SF6 gas

DOil circuit breakers

Correct answer

C. Circuit breaker with SF6 gas

Explanation

The correct answer is Circuit breaker with SF6 gas.

In a three phase voltage source inverters________?

ABoth amplitude and phase is controllable

BOnly phase is controllable

CAmplitude, phase and frequency of voltages should always be controllable

DOnly amplitude of voltage is controllable

Correct answer

C. Amplitude, phase and frequency of voltages should always be controllable

Explanation

The correct answer is Amplitude, phase and frequency of voltages should always be controllable.

Maximum demand on a power plant is________?

Ainstantaneous maximum value of kVA supplied during a period

Bboth A. or B.

Cnone of the above

Dthe greatest of all “short time interval averaged” demand during a period

Correct answer

D. the greatest of all “short time interval averaged” demand during a period

Explanation

The correct answer is the greatest of all “short time interval averaged” demand during a period.