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All Electrical Engineering MCQs

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

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1831Electrical EngineeringMedium

The stray line of magnetic flux is defined as________?

Aa line vertical to the flux lines

Ba line of magnetic flux which does not follow the designed path

Ca line of magnetic flux in a non-uniform field

Dthe mean length of a ring shaped coil

Correct answer

B. a line of magnetic flux which does not follow the designed path

Explanation

The correct answer is a line of magnetic flux which does not follow the designed path.

1832Electrical EngineeringMedium

In TV transmission, sound signal is ________modulated?

ANone of the above

BPhase

CFrequency

DAmplitude

Correct answer

C. Frequency

Explanation

The correct answer is Frequency.

1833Electrical EngineeringMedium

In induction heating ________ is abnormally high?

Acurrent

Bvoltage

Cfrequency

Dphase angle

Correct answer

C. frequency

Explanation

The correct answer is frequency.

1834Electrical EngineeringMedium

Internal resistance of ideal current source is?

A100 ohms

Bzero

Cinfinite

Dfinite

Correct answer

C. infinite

Explanation

Ideal current source delivers energy at specified current, which is independent on voltage across the load. The internal resistance must become very high to deliver maximum current.

1835Electrical EngineeringMedium

In a single phase motor the centrifugal switch________?

Areconnects the auxiliary winding of the motor

Breconnects the main winding the motor

Cdisconnects main winding of the motor

Ddisconnects auxiliary winding of the motor

Correct answer

D. disconnects auxiliary winding of the motor

Explanation

The correct answer is disconnects auxiliary winding of the motor.

1836Electrical EngineeringMedium

The rotor developed by a single-phase motor at starting is________?

Amore than i.he rated torque

Bless than the rated torque

Crated torque

Dzero

Correct answer

D. zero

Explanation

The correct answer is zero.

1837Electrical EngineeringMedium

Which of the following essential features is possessed by an indicating instrument?

ADamping device

BControlling device

CAll of the above

DDeflecting device

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.

1838Electrical EngineeringMedium

The total losses in a well designed D.C. generator of 10 kW will be nearly________?

A100 W

B1500 W

C1000 W

D500 W

Correct answer

D. 500 W

Explanation

The correct answer is 500 W.

1839Electrical EngineeringMedium

Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________?

AVc1 > Vc2 > Vc3 when Ig1 Ã¢â€°Â¥ Ig2 &Atil

BVc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

CVc1 = Vc2 = Vc3 any value of Ig.

Correct answer

B. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

Explanation

The correct answer is Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3..

1840Electrical EngineeringMedium

In which of the following device the generated emf and armature current are in the opposite directions?

Adc generator

Ball of the above

Ctransformer

Ddc motor

Correct answer

D. dc motor

Explanation

The correct answer is dc motor.

The stray line of magnetic flux is defined as________?

Aa line vertical to the flux lines

Ba line of magnetic flux which does not follow the designed path

Ca line of magnetic flux in a non-uniform field

Dthe mean length of a ring shaped coil

Correct answer

B. a line of magnetic flux which does not follow the designed path

Explanation

The correct answer is a line of magnetic flux which does not follow the designed path.

In a single phase motor the centrifugal switch________?

Areconnects the auxiliary winding of the motor

Breconnects the main winding the motor

Cdisconnects main winding of the motor

Ddisconnects auxiliary winding of the motor

Correct answer

D. disconnects auxiliary winding of the motor

Explanation

The correct answer is disconnects auxiliary winding of the motor.