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All Electrical Engineering MCQs

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

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291Electrical EngineeringMedium

Reduced voltage starter can be used with________?

Anone of the above

Bsquirrel cage as well as slip ring induction motor

Csquirrel cage induction motor only but not with slip ring motor

Dslip ring motor only but not with squirrel cage induction motor

Correct answer

B. squirrel cage as well as slip ring induction motor

Explanation

The correct answer is squirrel cage as well as slip ring induction motor.

292Electrical EngineeringMedium

Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as________?

Amicro-coulomb

Bpico-coulomb

Cmilli-coulomb

Dcoulomb

Correct answer

A. micro-coulomb

Explanation

The correct answer is micro-coulomb.

293Electrical EngineeringMedium

In case one phase of a three-phase synchronous motor is short-circuited the motor will________?

Anot start

Btake less than the rated load

Crun at 2/3 of synchronous speed

Drun with excessive vibrations

Correct answer

A. not start

Explanation

The correct answer is not start.

294Electrical EngineeringMedium

The no-load current drawn by transformer is usually what per cent of the full-load current?

A20 to 30 per cent

B2 to 5 per cent

C12 to 15 per cent

D0.2 to 0.5 per cent

Correct answer

B. 2 to 5 per cent

Explanation

The correct answer is 2 to 5 per cent.

295Electrical EngineeringMedium

A differential amplifier has a differential gain of 20,000. CMRR=80 dB. The common mode gain is given by________?

D1/2

Correct answer

C. 2

Explanation

The correct answer is 2.

296Electrical EngineeringMedium

Two 3.3 kΩ resistors are in series and this series combination is in parallel with a 4.7 kΩ resistor. The voltage across one of the 3.3 kΩ resistors is 12 V. The voltage across the 4.7 kΩ resistor is________?

A24 V

B0 V

C12 V

D6 V

Correct answer

A. 24 V

Explanation

The correct answer is 24 V.

297Electrical EngineeringMedium

Total number of crystal systems is________?

C12

Correct answer

D. 7

Explanation

The correct answer is 7.

298Electrical EngineeringMedium

emf induced in a circuit according to Faradays law depends on the________?

Arate of change of magnetic flux

Bchange in magnetic flux

Cinitial magnetic flux

Dmaximum magnetic flux

Correct answer

A. rate of change of magnetic flux

Explanation

The correct answer is rate of change of magnetic flux.

299Electrical EngineeringMedium

Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

AInter pole field

BSeries field

CShunt field

DCompensating field

Correct answer

C. Shunt field

Explanation

The correct answer is Shunt field.

300Electrical EngineeringMedium

A fuse is connected________?

Anone of the above

Beither in series or in parallel with circuit

Cin series with circuit

Din parallel with circuit

Correct answer

C. in series with circuit

Explanation

The correct answer is in series with circuit.

Reduced voltage starter can be used with________?

Anone of the above

Bsquirrel cage as well as slip ring induction motor

Csquirrel cage induction motor only but not with slip ring motor

Dslip ring motor only but not with squirrel cage induction motor

Correct answer

B. squirrel cage as well as slip ring induction motor

Explanation

The correct answer is squirrel cage as well as slip ring induction motor.