SYNCHRONOUS MOTOR- 3
Synchronous Motor Mastery Quiz
Test your knowledge on synchronous motors with our engaging quiz! This quiz covers various aspects of synchronous motors, including their power factor, construction, and operational characteristics. Perfect for students or professionals in electrical engineering.
Key topics include:
- Power Factor Variations
- DC Excitation Effects
- Damper Windings
- Non-Self Starting Mechanics
21. Power factor of a synchronous motor is unity when ___________
The armature current is maximum
The armature current is minimum
The armature current is zero
None of the above
22. Change of D.C.excitation of a synchronous motor changes __________
Applied voltage of the motor
Motor speed
Power factor of power drawn by the motor
All of the above
23. In a synchronous motor, damper windings are provided on _________
Stator frame
Rotor shaft
Pole faces
None of the above
24. In a synchronous motor, the damping winding is generally used to ___________
Prevent hunting and provide the starting torque
Reduce eddy current
Provide starting torque only
Reduce noise level
25. The construction of a synchronous motor resembles _____________
A series motor
An induction motor
An alternator
A rotatory convertor
26. For power factor corrections, synchronous motors operate at __________
No-load and greatly over-excited fields
No-load and under-excited fields
Normal load with minimum excitation
Normal load with zero excitation
27. The coupling angle or load angle of synchronous motor is defined as the angle between the ______________
Rotor and stator teeth
Rotor and the stator poles of opposite polarity
Rotor and the stator poles of same polarity
None of the above
28. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as _____________
Static condenser
Condenser
Synchronous condenser
None of the above
29. A synchronous motor can operate at ______________
Lagging power factor only
Leading power factor only
Unity power factor only
Lagging, leading and unity power factors
30.Which of the following motors is non-self starting?
D.C series motor
Synchronous motor
Squirrel cage induction motor
Wound round induction motor
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