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SYNCHRONOUS MOTORS 1

A detailed illustration of a synchronous motor with annotations highlighting its key components and operational principles in a technical style.

Synchronous Motors Quiz

Test your knowledge of synchronous motors with this comprehensive quiz designed for both students and professionals alike. Explore key concepts and deepen your understanding of motor operation, performance, and applications.

Assess your knowledge of synchronous motors
Learn about starting methods and operational characteristics
Engage with multiple choice questions that challenge your skills

10 Questions2 MinutesCreated by PowerDrive247

1. Synchronous motors are generally not self starting because ______________

The direction of rotation is not fixed

The direction of instantaneous torque reverses after half cycle

Starters cannot be used on these machines

Starting winding is not provided on the machines

2. A pony motor is basically a ______________

Small induction motor

DC series motor

DC shunt motor

Double winding A.C./D.C. motor

3. A synchronous motor can be started by _____________

Pony motor

DC compound motor

Providing damper winding

Any of the above

4. A three-phase synchronous motor will have (rotating field type)______________

No slip rings

One slip ring

Two slip rings

Three slip rings

5. Under which of the following conditions, hunting of synchronous motor is likely to Occur ______________

Periodic variation of load

Over exciatation

Over-loading for long periods

Small and constant load

6. A synchronous motor can be used as a synchronous capacitor when it is ____________

Under loaded

Over loaded

Under excited

Over excited

7. Synchronous motor always runs at ___________

The synchronous speed

Less than the synchronous speed

More than the synchronous speed

None of the above

8. An over-excited synchronous motor takes ______________

Leading current

Lagging current

Both a & b

None of the above

9. The minimum armature current of the synchronous motor corresponds to operation at ______________

Zero power factor leading

Unity power factor

0.707 power factor lagging

0.707 power factor leading

10. In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on ____________

DC excitation only

Speed of the motor

Load on the motor

Both the speed and rotor flux

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