Polyphase Induction Motors MCQ Questions & Answers

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An induction motor can run at synchronous speed when

A) It is run on load B) It is run in reverse direction C) It is run on voltage higher than the rated voltage D) e.m.f. is injected in the rotor circuit

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Slip ring motor is preferred over squirrel cage induction motor where

A) High starting torque is required B) Load torque is heavy C) Heavy pull out torque is required D) All of the above

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

A change of 4% of supply voltage to an induction motor will produce a change of approximately

A) 4% in the rotor torque B) 8% in the rotor torque C) 12% in the rotor torque D) 16% in the rotor torque

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

If an induction motor with certain ratio of rotor to stator slots, runs at $$\frac{1}{7}$$ of the normal speed, the phenomenon will be termed as

A) Humming B) Hunting C) Crawling D) Cogging

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Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The 'cogging' of an induction motor can be avoided by

A) Proper ventilation B) Using DOL starter C) Autotransformer starter D) Having number of rotor slots more or less than the number of stator slots (not equal)

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Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

The power scale of circle diagram of an induction motor can be found from

A) Stator resistance test B) No-load test only C) Short-circuit test only D) None of the above

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

In a three-phase induction motor, the number of poles in the rotor winding is always

A) Zero B) More than the number of poles in stator C) Less than number of poles in stator D) Equal to number of poles in stator

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Which type of bearing is provided in small induction motors to support the rotor shaft?

A) Ball bearings B) Cast iron bearings C) Bush bearings D) None of the above

Discuss

Answer & Solution

Answer: Option A

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The vafcie of transformation ratio of an induction motor can be found by

A) Open-circuit test only B) Short-circuit test only C) Stator resistance test D) None of the above

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

An induction motor is identical to

A) D.C. compound motor B) D.C. series motor C) Synchronous motor D) Asynchronous motor

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

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Polyphase Induction Motors MCQ Questions & Answers | Electrical Engineering