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All Electrical Engineering MCQs

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

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1631Electrical EngineeringMedium

The attraction capacity of electromagnet will increase if the________?

Acore area increases

Bflux density decreases

Ccore length increases i

Dflux density increases

Correct answer

D. flux density increases

Explanation

The correct answer is flux density increases.

1632Electrical EngineeringMedium

The field coils of D.C. generator are usually made of________?

Acopper

Bcarbon

Ccast iron

Dmica

Correct answer

A. copper

Explanation

The correct answer is copper.

1633Electrical EngineeringMedium

Switching frequency of SITH is________?

A60 KHz

B5 KHz

C10 KHz

D100 KHz

Correct answer

D. 100 KHz

Explanation

The correct answer is 100 KHz.

1634Electrical EngineeringMedium

The ability of charged bodies to exert force on 6ne another is attributed to the existence of________?

Aelectrons

Bprotons

Celectric field

Dneutrons

Correct answer

C. electric field

Explanation

The correct answer is electric field.

1635Electrical EngineeringMedium

An induction motor can run at synchronous speed when________?

Ait is run on voltage higher than the rated voltage

Be.m.f. is injected in the rotor circuit

Cit is run on load

Dit is run in reverse direction

Correct answer

B. e.m.f. is injected in the rotor circuit

Explanation

The correct answer is e.m.f. is injected in the rotor circuit.

1636Electrical EngineeringMedium

Time constant of an inductive circuit________?

Aincreases with increase of inductance and decrease of resistance

Bincreases with decrease of inductance and increase of resistance

Cincreases with the increase of inductance and the increase of resistance

Dincreases with the decrease of inductance and decrease of resistance

Correct answer

A. increases with increase of inductance and decrease of resistance

Explanation

The correct answer is increases with increase of inductance and decrease of resistance.

1637Electrical EngineeringMedium

In a charged capacitor the energy resides in________?

Agravitational field

Belectric field

Cnuclear field

Dmagnetic hield

Correct answer

B. electric field

Explanation

The correct answer is electric field.

1638Electrical EngineeringMedium

If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor________?

Acan be used for 50°C ambient temperature also

Bof higher H.P. should be selected

Cof lower H.P. should be selected

Dis to be derated by a factor recommended by manufacturer and select the next higher H.P. motor

Correct answer

D. is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor

Explanation

The correct answer is is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.

1639Electrical EngineeringMedium

Air capacitors are generally available in the range________?

A100 to 900 pF

B1 to 20 pF

C20 to 100 pF

D10 to 400 pF

Correct answer

D. 10 to 400 pF

Explanation

The correct answer is 10 to 400 pF.

1640Electrical EngineeringMedium

Electro-mechanical voltage regulators are generally used in________?

Agenerators

Ball of the above

Creactors

Dtransformers

Correct answer

A. generators

Explanation

The correct answer is generators.

Time constant of an inductive circuit________?

Aincreases with increase of inductance and decrease of resistance

Bincreases with decrease of inductance and increase of resistance

Cincreases with the increase of inductance and the increase of resistance

Dincreases with the decrease of inductance and decrease of resistance

Correct answer

A. increases with increase of inductance and decrease of resistance

Explanation

The correct answer is increases with increase of inductance and decrease of resistance.

If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor________?

Acan be used for 50°C ambient temperature also

Bof higher H.P. should be selected

Cof lower H.P. should be selected

Dis to be derated by a factor recommended by manufacturer and select the next higher H.P. motor

Correct answer

D. is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor

Explanation

The correct answer is is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor.