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All Electrical Engineering MCQs

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

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431Electrical EngineeringMedium

While preparing electrolyte for a lead-acid battery________?

Aanyone of the two can be added to other chemical

Bwater is poured into acid

Cacid is poured into water

Correct answer

C. acid is poured into water

Explanation

The correct answer is acid is poured into water.

432Electrical EngineeringMedium

Satisfactory commutation of D.C. machines requires________?

Aall of the above

Bbrushes should smoothly run in the holders

Cbrushes should be of proper grade and size

Dsmooth, concentric commutator properly undercut

Correct answer

A. all of the above

Explanation

The correct answer is all of the above.

433Electrical EngineeringMedium

In case of three core flexible cable the colour of the neutral is________?

Ablack

Bbrown

Cblue

Dnone of the above

Correct answer

C. blue

Explanation

The correct answer is blue.

434Electrical EngineeringMedium

If the input a.c. voltage to regulated or ordinary power supply increases by 5% what will be the approximate change in d.c. output voltage?

A10%

B20%

C5%

D15%

Correct answer

C. 5%

Explanation

The correct answer is 5%.

435Electrical EngineeringMedium

A differential relay measures the vector difference between________?

Atwo voltages

Bnone of the above

Ctwo or more similar electrical quantities

Dtwo currents

Correct answer

C. two or more similar electrical quantities

Explanation

The correct answer is two or more similar electrical quantities.

436Electrical EngineeringMedium

________ is an example of piezoelectric material?

AGlass

BNeoprene

CQuartz

DCorrundum

Correct answer

C. Quartz

Explanation

The correct answer is Quartz.

437Electrical EngineeringMedium

A paper capacitor is usually available in the form of________?

Adisc

Brolled foil

Cmeshed plates

Dtubes

Correct answer

B. rolled foil

Explanation

The correct answer is rolled foil.

438Electrical EngineeringMedium

As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit________?

Aa resistance is connected in series with armature

Barmature is temporarily open circuited

Ca high value resistor is connected across the field winding

Da resistance is connected parallel to the armature

Correct answer

A. a resistance is connected in series with armature

Explanation

The correct answer is a resistance is connected in series with armature.

439Electrical EngineeringMedium

The inverse definite mean time relays are used for over current and earth fault protection of transformer against________?

Aall of the above

Bheavy loads

Cexternal short-circuits

Dinternal short-circuits

Correct answer

D. internal short-circuits

Explanation

The correct answer is internal short-circuits.

440Electrical EngineeringMedium

When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is________?

A1 n-mho

Bnone of the above

C106 mho

D1 milli-mho

Correct answer

A. 1 n-mho

Explanation

The correct answer is 1 n-mho.

As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit________?

Aa resistance is connected in series with armature

Barmature is temporarily open circuited

Ca high value resistor is connected across the field winding

Da resistance is connected parallel to the armature

Correct answer

A. a resistance is connected in series with armature

Explanation

The correct answer is a resistance is connected in series with armature.