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All Electrical Engineering MCQs

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731Electrical EngineeringMedium

If free space between the plates of a capacitor is replaced by a dielectric________?

AThe potential difference decreases but both capacitance and energy increase

Bboth potential difference and capacitance decrease but energy increases

CThe potential difference remains constant capacittance and energy stored increases

DThe potential difference remains constant capacittance decreases and energy increases

Correct answer

A. The potential difference decreases but both capacitance and energy increase

Explanation

The correct answer is The potential difference decreases but both capacitance and energy increase.

732Electrical EngineeringMedium

Which of the following materials has the highest value of dielectric constant________?

AOil

BCeramics

CVacuum

DGlass

Correct answer

A. Oil

Explanation

The correct answer is Oil.

733Electrical EngineeringMedium

Which circuit element(s) will oppose the change in circuit current?

AInductance and capacitance

BCapacitance only

CInductance only

DResistance only

Correct answer

C. Inductance only

Explanation

The correct answer is Inductance only.

734Electrical EngineeringMedium

A field line and an equipotential surface are________?

Aalways parallel

Binclined at any angle 0

Calways at 90°

Dnone of the above

Correct answer

C. always at 90°

Explanation

The correct answer is always at 90°.

735Electrical EngineeringMedium

Which of the following methods is used for air cooling of turbo-alternators?

AMultiple inlet system

BAll of the above

CTwo sided axial ventilation

DOne sided axial ventilation

Correct answer

B. All of the above

Explanation

The correct answer is All of the above.

736Electrical EngineeringMedium

The speed of a superfast train is________?

A75 kmph

Bmore than 100 kmph

C60 kmph

D100 kmph

Correct answer

B. more than 100 kmph

Explanation

The correct answer is more than 100 kmph.

737Electrical EngineeringMedium

A rotory converter can also be run as a________?

Ad.c. compound motor

Binduction motor

Csynchronous motor

Dd.c. shunt motor

Ed.c. series motor

Correct answer

C. synchronous motor

Explanation

The correct answer is synchronous motor.

738Electrical EngineeringMedium

The switch that has the fastest speed of operation is ________ switch?

AElectronic

BElectromechanical

CNone of the above

DMechanical

Correct answer

A. Electronic

Explanation

The correct answer is Electronic.

739Electrical EngineeringMedium

A.C can not be used for________?

Aproducing light

Bproducing heat

CMagnetizing iron

DProducing magnetic field

Correct answer

C. Magnetizing iron

Explanation

The correct answer is Magnetizing iron.

740Electrical EngineeringMedium

Which of the following insulation is used in cables?

AVarnished cambric

BRubber

CAny of the above

DPaper

Correct answer

C. Any of the above

Explanation

The correct answer is Any of the above.

If free space between the plates of a capacitor is replaced by a dielectric________?

AThe potential difference decreases but both capacitance and energy increase

Bboth potential difference and capacitance decrease but energy increases

CThe potential difference remains constant capacittance and energy stored increases

DThe potential difference remains constant capacittance decreases and energy increases

Correct answer

A. The potential difference decreases but both capacitance and energy increase

Explanation

The correct answer is The potential difference decreases but both capacitance and energy increase.