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All Electrical Engineering MCQs

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

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531Electrical EngineeringMedium

In over compounded generator, full load terminal voltage is________?

Aless than no load terminal voltage

Bmore than no load terminal voltage

Cequal to no-load terminal voltage

Dalmost zero

Correct answer

B. more than no load terminal voltage

Explanation

The correct answer is more than no load terminal voltage.

532Electrical EngineeringMedium

In majority of instruments damping is provided by________?

Aspring

Beddy currents

Call of the above

Dfluid friction

Correct answer

B. eddy currents

Explanation

The correct answer is eddy currents.

533Electrical EngineeringMedium

The magneto-motive force is________?

Athe flow of an electric current

Bthe voltage across the two ends of exciting coil

Cthe passage of magnetic field through an exciting coil

Dthe sum of all currents embraced by one line of magnetic field

Correct answer

D. the sum of all currents embraced by one line of magnetic field

Explanation

The correct answer is the sum of all currents embraced by one line of magnetic field.

534Electrical EngineeringMedium

The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is________?

A180o

B90o

C270o

D0o

Correct answer

A. 180o

Explanation

The correct answer is 180o.

535Electrical EngineeringMedium

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be________?

A600 V

B580 V

C620 V

D640 V

Correct answer

B. 580 V

Explanation

The correct answer is 580 V.

536Electrical EngineeringMedium

N atural air coo ling is generally restricted for transformers up to________?

A5 MVA

B15 MVA

C50 MVA

D1.5 MVA

Correct answer

D. 1.5 MVA

Explanation

The correct answer is 1.5 MVA.

537Electrical EngineeringMedium

A ________ is used to measure the stator % winding temperature of the generator?

Athermocouple

Bresistance thermometer

Cthermometer

Dpyrometer

Correct answer

B. resistance thermometer

Explanation

The correct answer is resistance thermometer.

538Electrical EngineeringMedium

A signal other than the reference input that tends to affect the value of controlled variable is known as________?

Adisturbance

Bcontrol element

Creference input

Dcommand

Correct answer

A. disturbance

Explanation

The correct answer is disturbance.

539Electrical EngineeringMedium

The current drawn by the line due to corona losses is________?

Asinusoidal

Bsquare

Cnon-sinusoidal

Dtriangular

Correct answer

C. non-sinusoidal

Explanation

The correct answer is non-sinusoidal.

540Electrical EngineeringMedium

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it________?

Ahelps the rotor teeth to remain under the stator teeth

Bimproves the power factor

Cimproves the efficiency

Dhelps in reducing the tendency of the rotor teeth to remain under the stator teeth

Correct answer

D. helps in reducing the tendency of the rotor teeth to remain under the stator teeth

Explanation

The correct answer is helps in reducing the tendency of the rotor teeth to remain under the stator teeth.

The magneto-motive force is________?

Athe flow of an electric current

Bthe voltage across the two ends of exciting coil

Cthe passage of magnetic field through an exciting coil

Dthe sum of all currents embraced by one line of magnetic field

Correct answer

D. the sum of all currents embraced by one line of magnetic field

Explanation

The correct answer is the sum of all currents embraced by one line of magnetic field.

The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it________?

Ahelps the rotor teeth to remain under the stator teeth

Bimproves the power factor

Cimproves the efficiency

Dhelps in reducing the tendency of the rotor teeth to remain under the stator teeth

Correct answer

D. helps in reducing the tendency of the rotor teeth to remain under the stator teeth

Explanation

The correct answer is helps in reducing the tendency of the rotor teeth to remain under the stator teeth.