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Electrician Set-1
Polyphase Induction Motors
39

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

39) The principle of operation of a 3-phase induction motor is similar to that of a

synchronous motor

repulsion start induction motor

transformer with a shorted secondary

capacitor start, induction run motor

Answer is:

transformer with a shorted secondary

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

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Related Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

40) The effect of increasing the length of air gap in an induction motor will be to increase the

power factor

speed

magnetising current

air gap flux

Answer is:

magnetising current

41) In a 3 phase induction motor, the relative speed of stator flux with respect to _____ is zero.

stator winding

rotor

rotor flux

space

Answer is:

rotor flux

42) A 3-phase, 4-pole, 50 Hz induction motor runs at a speed of 1440 R.P.M. The rotating field produced by the rotor rotates at a speed of _____ R.P.M. with respect to the rotor.

1500

1440

1550

500

Answer is:

1440

43) in a 3-phase induction motor, the rotor field rotates at synchronous speed with respect to

stator

rotor

stator flux

none of the above

Answer is:

stator

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

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