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All Electrical Engineering MCQs

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

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891Electrical EngineeringMedium

Armature coil is short circuited by brushes when it lies________?

Aalong field axis

Balong neutral axis

Cin none of the above positions

Din any of the above positions

Correct answer

B. along neutral axis

Explanation

The correct answer is along neutral axis.

892Electrical EngineeringMedium

As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its________?

Asmall quantity of electrolyte used

Blower e.m.f.

Ccompactness

Dhigher internal resistance

Correct answer

D. higher internal resistance

Explanation

The correct answer is higher internal resistance.

893Electrical EngineeringMedium

When current feedback (negative) is applied to an amplifier, its output impedance ________?

ARemains the same

BIs decreased

CNone of the above

DIs increased

Correct answer

D. Is increased

Explanation

The correct answer is Is increased.

894Electrical EngineeringMedium

In a synchronous motor, the maximum power developed depends on all of the following except:

Amaximum value of coupling angle

Brotor excitation

Cdirection of rotation

Dsupply voltage

Correct answer

C. direction of rotation

Explanation

The correct answer is direction of rotation.

895Electrical EngineeringMedium

Transformer coupling can be used in________amplifiers?

ANone of the above

BEither power or voltage

COnly voltage

DOnly power

Correct answer

B. Either power or voltage

Explanation

The correct answer is Either power or voltage.

896Electrical EngineeringMedium

An electrolytic capacitor is generally made to provide________?

Alarge value of capacitance

Bvariable capacitance

Clow capacitance

Dfixed capacitance

Correct answer

A. large value of capacitance

Explanation

The correct answer is large value of capacitance.

897Electrical EngineeringMedium

In a p-channel JFET, the charge carriers are ________?

Aelectrons

Bholes

Cnone of the above

Dboth electrons and holes

Correct answer

B. holes

Explanation

The correct answer is holes.

898Electrical EngineeringMedium

________ has the lowest noise-level?

AJFET

Btetrode

Ctriode

Dordinary trnsistor

Correct answer

A. JFET

Explanation

The correct answer is JFET.

899Electrical EngineeringMedium

A shunt generator can self-excite:________?

Aonly if the resistance of the field circuit is greater than critical value

Birrespective of the value of the resistance in the field circuit

Cnone

Donly if the resistance of the field circuit is less than critical value

Correct answer

D. only if the resistance of the field circuit is less than critical value

Explanation

The correct answer is only if the resistance of the field circuit is less than critical value.

900Electrical EngineeringMedium

A ferrite core has less eddy current loss than an iron core because________?

Aferrites have high resistance

Bferrites have high hysteresis

Cferrites are magnetic

Dferrites have low permeability

Correct answer

A. ferrites have high resistance

Explanation

The correct answer is ferrites have high resistance.

A shunt generator can self-excite:________?

Aonly if the resistance of the field circuit is greater than critical value

Birrespective of the value of the resistance in the field circuit

Cnone

Donly if the resistance of the field circuit is less than critical value

Correct answer

D. only if the resistance of the field circuit is less than critical value

Explanation

The correct answer is only if the resistance of the field circuit is less than critical value.