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Synchronous Motors

Synchronous Motors
A synchronous motor develop maximum power when load angle is

90°
60°
45°
120°

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Synchronous Motors
When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______

None of the listed here
45° (electrical) behind stator poles
Coincident with statorbpoles
Mid way between N and S poles of stator

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Synchronous Motors
Slip rings in a synchronous motor carry

All of the listed here
Alternating current
No current
Direct current

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Synchronous Motors
The minimum armature current of the synchronous motor corresponds to operation at

zero power factor leading
0.707 power factor leading
unity power factor
0.707 power factor lagging

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Synchronous Motors
The speed of a synchronous motor

Decreases as the load decreases
None of the listed here
Always remains constant
Increases as the load increases

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Synchronous Motors
Damper winding in a synchronous motor________

Reduces windage losses
Increases hunting of the motor
Serves to start the motor
Improve pf of the motor

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MORE MCQ ON Synchronous Motors

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