Synchronous Motors MCQ Questions & Answers

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Each section contains 100 MCQs on Synchronous Motors .

In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

A) the motor is said to be fully loaded B) the torque generated is maximum C) the excitation is said to be zero per cent D) the excitation is said to be hundred per cent

Discuss

Answer & Solution

Answer: Option D

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

A synchronous motor develops maximum power when load angle is

A) 45° B) 60° C) 90° D) 120°

Discuss

Answer & Solution

Answer: Option C

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

A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have

A) no change of power factor B) lagging power factor with over-excitation C) leading power factor with under-excitation D) leading power factor with over-excitation

Discuss

Answer & Solution

Answer: Option D

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

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

A) pull-up torque B) pull-in torque C) pull-out torque D) none of the above

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Answer & Solution

Answer: Option B

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

Change of D.C. excitation of a synchronous motor changes

A) Applied voltage of the motor B) Motor speed C) Power factor of power drawn by the motor D) Any of the above

Discuss

Answer & Solution

Answer: Option C

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

Mostly, synchronous motors are of

A) alternator type machines B) induction type machines C) salient pole type machines D) smooth cylindrical type machines

Discuss

Answer & Solution

Answer: Option C

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

A synchronous machine with low value of short-circuit ratio has

A) lower stability limit B) high stability limit C) good speed regulation D) good voltage regulation

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Answer & Solution

Answer: Option A

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

In a synchronous motor which loss varies with load ?

A) Windage loss B) Bearing friction loss C) Copper loss D) Core loss

Discuss

Answer & Solution

Answer: Option C

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

The magnitude of field flux in a 3-phase synchronous motor

A) remains constant at all loads B) varies with speed C) varies with the load D) varies with power factor

Discuss

Answer & Solution

Answer: Option A

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

100

The efficiency of a properly designed synchronous motor will usually fall in range

A) 60 to 70% B) 75 to 80% C) 85 to 95% D) 99 to 99.5%

Discuss

Answer & Solution

Answer: Option C

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

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Synchronous Motors MCQ Questions & Answers | Electrical Engineering