Synchronous Motors MCQ Questions & Answers

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Each section contains 100 MCQs on Synchronous Motors .

A synchronous motor will always stop when

A) supply voltage fluctuates B) load in motor varies C) excitation winding gets disconnected D) supply voltage frequency changes

Discuss

Answer & Solution

Answer: Option C

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

Which of the following motors will be used in electric clocks ?

A) D.C. shunt motor B) D.C. series motor C) A.C. induction motor D) A.C. synchronous motor

Discuss

Answer & Solution

Answer: Option D

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

When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way

A) augments it directly B) directly opposes it C) cross-magnetises it D) none of the above

Discuss

Answer & Solution

Answer: Option B

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

In a synchronous motor, damper windings are provided on

A) stator frame B) rotor shaft C) pole faces 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 synchronous motor, the damping winding is generally used to

A) prevent hunting and provide the starting torque B) reduce the eddy currents C) provide starting torque only D) reduce noise level

Discuss

Answer & Solution

Answer: Option A

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

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because

A) synchronous motor has no slip B) stator supply is not required to produce magnetic field C) mechanical load on the rotor remains constant D) synchronous motor has large airgap

Discuss

Answer & Solution

Answer: Option B

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

Under which of the following conditions hunting of synchronous motor is likely to occur ?

A) Periodic variation of load B) Over-excitation C) Over-loading for long periods D) Small and constant load

Discuss

Answer & Solution

Answer: Option A

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

The torque angle, in a synchronous motor, is the angle between

A) the supply voltage and the back e.m.f. B) magnetising current and back e.m.f. C) the rotating stator flux and rotor poles D) none of the above

Discuss

Answer & Solution

Answer: Option C

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

A synchronous motor is running with normal excitation. When the load is increased, the armature current drawn by it increases because

A) Speed of the motor is reduced B) Power factor is decreased C) Eb (back e.m.f.) becomes less than V (applied voltage) D) Er (net resultant voltage) in armature is increased

Discuss

Answer & Solution

Answer: Option D

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

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will

A) stop B) run as induction motor C) function as static condenser D) burn with dense smoke

Discuss

Answer & Solution

Answer: Option A

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

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Synchronous Motors MCQ Questions & Answers | Electrical Engineering