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All Electrical Engineering MCQs

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

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11Electrical EngineeringMedium

Power transformers are designed to have maximum efficiency at________?

A50% full load

Bnearly full load

C70% full load

Dno load

Correct answer

B. nearly full load

Explanation

The correct answer is nearly full load.

12Electrical EngineeringMedium

capacitors can be used only for D.C?

AAir

BMica

CElectrolytic

DPaper

Correct answer

C. Electrolytic

Explanation

The correct answer is Electrolytic.

13Electrical EngineeringMedium

at a point is equal to the negative potential gradient at that point?

AElectric intensity

BMagnetic flux density

CMagnetic flux

DElectric flux

Correct answer

A. Electric intensity

Explanation

The correct answer is Electric intensity.

14Electrical EngineeringMedium

The power factor at resonance in R-L- C parallel circuit is________?

Aunity

B0.8 leading

Czero

D0.08 lagging

Correct answer

A. unity

Explanation

The correct answer is unity.

15Electrical EngineeringMedium

The electric field at a point situated at a distance d from straight charged conductor is________?

Anone of the above

Binversely proportional to d

Cproportional to d

Correct answer

B. inversely proportional to d

Explanation

The correct answer is inversely proportional to d.

16Electrical EngineeringMedium

The synchronous motor is not inherently self-starting because________?

Aa rotating magnetic field does not have enough poles

Bthe force required to accelerate the rotor to the synchronous speed in an instant is absent

Cthe rotating magnetic field is produced by only 50 Hz frequency currents

Dthe starting device to accelerate the rotor to near synchronous speed is absent

Correct answer

B. the force required to accelerate the rotor to the synchronous speed in an instant is absent

Explanation

The correct answer is the force required to accelerate the rotor to the synchronous speed in an instant is absent.

17Electrical EngineeringMedium

A dielectric material must be________?

Agood conductor

Bresistor

Csemi conductor

Dinsulator

Correct answer

D. insulator

Explanation

The correct answer is insulator.

18Electrical EngineeringMedium

Which of the following braking systems on the locomotives is costly?

ARegenerative braking on electric locomotives

BVacuum braking on steam locomotives

CAll braking systems are equally costly

DVacuum braking on diesel locomotives

Correct answer

A. Regenerative braking on electric locomotives

Explanation

The correct answer is Regenerative braking on electric locomotives.

19Electrical EngineeringMedium

A transformer can have zero voltage regulation at________?

Aunity power factor

Bleading power factor

Clagging power factor

Dzero power factor

Correct answer

B. leading power factor

Explanation

The correct answer is leading power factor.

20Electrical EngineeringMedium

In a boiler installation the natural draught is produced________?

Adue to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in

Bdue to the fact that at the chimney top the pressure is more than its environmental pressure

Cdue to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column

Dall of the above

Correct answer

C. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column

Explanation

The correct answer is due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column.

The synchronous motor is not inherently self-starting because________?

Aa rotating magnetic field does not have enough poles

Bthe force required to accelerate the rotor to the synchronous speed in an instant is absent

Cthe rotating magnetic field is produced by only 50 Hz frequency currents

Dthe starting device to accelerate the rotor to near synchronous speed is absent

Correct answer

B. the force required to accelerate the rotor to the synchronous speed in an instant is absent

Explanation

The correct answer is the force required to accelerate the rotor to the synchronous speed in an instant is absent.

In a boiler installation the natural draught is produced________?

Adue to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in

Bdue to the fact that at the chimney top the pressure is more than its environmental pressure

Cdue to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column

Dall of the above

Correct answer

C. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column

Explanation

The correct answer is due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column.