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All Electrical Engineering MCQs

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

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2121Electrical EngineeringMedium

Which of the following component, in a steam power plant, needs maximum maintenance attention?

ABoiler

BCondenser

CSteam turbine

DWater treatment plant

Correct answer

A. Boiler

Explanation

The correct answer is Boiler.

2122Electrical EngineeringMedium

n a phase controlled 3 phase ac voltage controller, the harmonic present is________?

A5th

B3rd

C2nd

D7th

Correct answer

C. 2nd

Explanation

The correct answer is 2nd.

2123Electrical EngineeringMedium

Electric flux due to a point charge +q is________?

Aq/ɛ0

B4IIɛ0

C1/4IIɛ0. q/r2

D1/4IIɛ q/r

Correct answer

A. q/ɛ0

Explanation

The correct answer is q/ɛ0.

2124Electrical EngineeringMedium

Which of the following single-phase induction motors is generally used in time phonographs?

AResistance start

BCapacitor start capacitor run

CUniversal

DShaded pole

Correct answer

D. Shaded pole

Explanation

The correct answer is Shaded pole.

2125Electrical EngineeringMedium

The metal having the lowest temperature coefficient of resistance is________?

Aaluminium

Bkanthal

Ccopper

Dgold

Correct answer

D. gold

Explanation

The correct answer is gold.

2126Electrical EngineeringMedium

Generally, the gain of a transistor amplifier falls at high frequencies due to the________?

ASkin effect

BCoupling capacitor at the output

CCoupling capacitor at the input

DInternal Capacitance of the device

Correct answer

D. Internal Capacitance of the device

Explanation

The correct answer is Internal Capacitance of the device.

2127Electrical EngineeringMedium

Which statement is true for latching current ________?

AIt is related to conduction process of device.

BIt is related to turn off process of the device.

CIt is related to turn on process of the device.

DBoth C and D.

Correct answer

C. It is related to turn on process of the device.

Explanation

The correct answer is It is related to turn on process of the device..

2128Electrical EngineeringMedium

The commutator segments are connected to the armature conductors by means of________?

Aresistance wires

Binsulation pads

Cbrazing

Dcopper lugs

Correct answer

D. copper lugs

Explanation

The correct answer is copper lugs.

2129Electrical EngineeringMedium

According to Kirchhoffs voltage law, the algebraic sum of all IR drops and e.m.fs. in any closed loop of a network is always________?

Anegative

Bdetermined by battery e.m.fs.

Cpositive

Dzero

Correct answer

D. zero

Explanation

The correct answer is zero.

2130Electrical EngineeringMedium

According to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of________?

Aresultant force on conductor

Bcurrent in the conductor aovtaat of conductor

Cnone of the above

Correct answer

B. current in the conductor aovtaat of conductor

Explanation

The correct answer is current in the conductor aovtaat of conductor.

Which statement is true for latching current ________?

AIt is related to conduction process of device.

BIt is related to turn off process of the device.

CIt is related to turn on process of the device.

DBoth C and D.

Correct answer

C. It is related to turn on process of the device.

Explanation

The correct answer is It is related to turn on process of the device..