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All Electrical Engineering MCQs

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

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2561Electrical EngineeringMedium

A short-circuit is identified by________?

Avoltage drop

Bheavy current flow

Cno current flow

Dvoltage rise

Correct answer

B. heavy current flow

Explanation

The correct answer is heavy current flow.

2562Electrical EngineeringMedium

The common impurity in the electrolyte of lead-acid battery is________?

Alead crystals

Biron

Cdust particles

Dchlorine

Correct answer

B. iron

Explanation

The correct answer is iron.

2563Electrical EngineeringMedium

________ locomotive has the highest operational availability?

ADiesel

BSteam

CElectric

Correct answer

C. Electric

Explanation

The correct answer is Electric.

2564Electrical EngineeringMedium

Rankine efficiency of a steam power plant________?

Aimproves in summer as compared to that in winter

Bis unaffected by climatic conditions

Cimproves in winter as compared to that in summer

Dnone of the above

Correct answer

C. improves in winter as compared to that in summer

Explanation

The correct answer is improves in winter as compared to that in summer.

2565Electrical EngineeringMedium

In a battery cover is placed over the element and sealed to the top of the battery container. This is done________?

Ato reduce evaporation of water from electrolyte

Bto discharge none of the above functions

Cto exclude dirt and foreign matter from the electrolyte

Dto discharge both of the above functions

Correct answer

D. to discharge both of the above functions

Explanation

The correct answer is to discharge both of the above functions.

2566Electrical EngineeringMedium

The law that the induced e.m.f. and current always oppose the cause producing them is due to________?

ANewton

BFaraday

CLenz

DCoulomb

Correct answer

C. Lenz

Explanation

The correct answer is Lenz.

2567Electrical EngineeringMedium

In thermal power plant, heat from the flue gases is utilized in________?

Aeconomizer

Bcondenser

Cchimney

Dsuper heater

Correct answer

A. economizer

Explanation

The correct answer is economizer.

2568Electrical EngineeringMedium

Conductance is reciprocal of________?

Acapacitance

Binductance

Cresistance

Dreluctance

Correct answer

C. resistance

Explanation

The correct answer is resistance.

2569Electrical EngineeringMedium

The value of reheat factor normally varies from________?

A0.9 to 0.95

B1.02 to 1.06

C1.2 to 1.6

D0.5 to 0.6

Correct answer

B. 1.02 to 1.06

Explanation

The correct answer is 1.02 to 1.06.

2570Electrical EngineeringMedium

An induction wattmeter can be used for________?

AA.C. only

Bany of the above

CD.C. only

Dboth D.C. and A.C.

Correct answer

C. D.C. only

Explanation

The correct answer is D.C. only.

Rankine efficiency of a steam power plant________?

Aimproves in summer as compared to that in winter

Bis unaffected by climatic conditions

Cimproves in winter as compared to that in summer

Dnone of the above

Correct answer

C. improves in winter as compared to that in summer

Explanation

The correct answer is improves in winter as compared to that in summer.

In a battery cover is placed over the element and sealed to the top of the battery container. This is done________?

Ato reduce evaporation of water from electrolyte

Bto discharge none of the above functions

Cto exclude dirt and foreign matter from the electrolyte

Dto discharge both of the above functions

Correct answer

D. to discharge both of the above functions

Explanation

The correct answer is to discharge both of the above functions.