SYNCHRONOUS MOTORS 1
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
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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