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

1281Electrical EngineeringMedium

The voltage induced in an inductor is represented as,

Aproduct of its inductance and current through it.

Bratio of the current through it to its inductance.

Cratio of its inductance to the current through it.

Dproduct of its inductance and rate of change of current through it.

Correct answer

D. product of its inductance and rate of change of current through it.

Explanation

The instantaneous voltage across the inductor is expressed as the product of inductance and a rate of change of current through it as it doesn’t allow any certain change of current through it. Voltage induced in an inductor is written as

1282Electrical EngineeringMedium

Which motor has the poorest speed control?

ACumulatively compounded motor

BShunt motor

CSeries motor

DDifferentially compounded motor

Correct answer

C. Series motor

Explanation

The correct answer is Series motor.

1283Electrical EngineeringMedium

Poor power factor________?

Aresults in more voltage drop in the line

Bresults in more power losses in the electrical system

Cresults in all above

Doverloads alternators, transformers and distribution lines

Ereduces load handling capability of electrical system

Correct answer

C. results in all above

Explanation

The correct answer is results in all above.

1284Electrical EngineeringMedium

The value of VBE ________?

AIs strongly dependant on IC

BDepends upon IC to moderate extent

CIs almost independent of IC

DNone of the above

Correct answer

C. Is almost independent of IC

Explanation

The correct answer is Is almost independent of IC.

1285Electrical EngineeringMedium

Armature reaction in dc motor results________?

Adecrease in speed

Bopen circuit

Cshort circuit

Dincrease in speed

Correct answer

D. increase in speed

Explanation

The correct answer is increase in speed.

1286Electrical EngineeringMedium

Electric intensity at any point in an electric field is equal to the at that point?

Apotential gradient

Bmagnetic flux density

Cnone of the above

Delectric flux

Correct answer

A. potential gradient

Explanation

The correct answer is potential gradient.

1287Electrical EngineeringMedium

In Weston synchronoscope the moving coil is connected across________?

Aincoming alternator

Bany of the above

Cbus-bars

Dfixed coils

Correct answer

C. bus-bars

Explanation

The correct answer is bus-bars.

1288Electrical EngineeringMedium

In a Wien-bridge oscillator, if the resistances in the positive feedback circuit are decreased, the frequency________?

ADecreases

BRemains the same

CIncreases

DInsufficient data

Correct answer

C. Increases

Explanation

The correct answer is Increases.

1289Electrical EngineeringMedium

Which of the following motors is preferred for tape-recorders?

AUniversal motor

BTwo value capacitor motor

CShaded pole motor

DHysteresis motor

Correct answer

D. Hysteresis motor

Explanation

The correct answer is Hysteresis motor.

1290Electrical EngineeringMedium

The speed regulation of a synchronous motor is always________?

A0.5%

Bpositive

Czero

D1%

Correct answer

C. zero

Explanation

The correct answer is zero.

The voltage induced in an inductor is represented as,

Aproduct of its inductance and current through it.

Bratio of the current through it to its inductance.

Cratio of its inductance to the current through it.

Dproduct of its inductance and rate of change of current through it.

Correct answer

D. product of its inductance and rate of change of current through it.

Explanation

Poor power factor________?

Aresults in more voltage drop in the line

Bresults in more power losses in the electrical system

Cresults in all above

Doverloads alternators, transformers and distribution lines

Ereduces load handling capability of electrical system

Correct answer

C. results in all above

Explanation

The correct answer is results in all above.