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All Electrical Engineering MCQs

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

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3631Electrical EngineeringMedium

A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ________?

AG+S

BNone of the above

CGS/(G+S)

Correct answer

C. GS/(G+S)

Explanation

The correct answer is GS/(G+S).

3632Electrical EngineeringMedium

A substance whose molecules consist of dissimilar atoms is called________?

Asuper-conducto

Binsulator

Csemi-conductor

Dcompound

Correct answer

D. compound

Explanation

The correct answer is compound.

3633Electrical EngineeringMedium

Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of________?

ADC output power to the transformer volt – amp rating required by primary

BDC output power to the transformer volt – amp rating required by secondary

CAC input power to the transformer volt – amp rating required by primary

DAC input power to the transformer volt – amp rating required by secondary

Correct answer

B. DC output power to the transformer volt – amp rating required by secondary

Explanation

The correct answer is DC output power to the transformer volt – amp rating required by secondary.

3634Electrical EngineeringMedium

In transistor amplifiers, we use________transformer for impedance matching?

ASame turn ratio

BStep up

CStep down

Correct answer

C. Step down

Explanation

The correct answer is Step down.

3635Electrical EngineeringMedium

For a sine wave with peak value Imax the r.m.s. value is________?

A0.5 Imax

B1.414 Lmax

C0.9

D0.707

Correct answer

D. 0.707

Explanation

The correct answer is 0.707.

3636Electrical EngineeringMedium

Which of the following circuit element stores energy in the electromagnetic field?

AInductance

BResistance

CVariable resistor

DCondenser

Correct answer

A. Inductance

Explanation

The correct answer is Inductance.

3637Electrical EngineeringMedium

An instrument which detects electric current is known as________?

Avoltmeter

Bwattmeter

Crheostat

Dgalvanometer

Correct answer

D. galvanometer

Explanation

The correct answer is galvanometer.

3638Electrical EngineeringMedium

For a differentiating circuit to be effective, the RC product should be ________ the time period of the input wave?

A5 times greater than

BAt least 10 times greater than

C5 times smaller than

DEqual to

Correct answer

B. At least 10 times greater than

Explanation

The correct answer is At least 10 times greater than.

3639Electrical EngineeringMedium

The dimensions of hie parameter are ________?

AFarad

BOhm

CMho

DNone of the above

Correct answer

B. Ohm

Explanation

The correct answer is Ohm.

3640Electrical EngineeringMedium

Generally grounding is provided for

Aonly for the safety of the equipment

Bnone of the above

Conly for the safety of the operating personnel

Dboth (A) and (B)

Correct answer

D. both (A) and (B)

Explanation

The correct answer is both (A) and (B).

Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of________?

ADC output power to the transformer volt – amp rating required by primary

BDC output power to the transformer volt – amp rating required by secondary

CAC input power to the transformer volt – amp rating required by primary

DAC input power to the transformer volt – amp rating required by secondary

Correct answer

B. DC output power to the transformer volt – amp rating required by secondary

Explanation

The correct answer is DC output power to the transformer volt – amp rating required by secondary.