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Synchronous Motors

Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____

45°
30°
0°
75°

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Synchronous Motors
Power factor of a synchronous motor is unity when

The armature current is maximum
The armature current is zero
The armature current is minimum
None of the listed here

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Synchronous Motors
A synchronous motor runs at only one speed because it ______

Is a doubly fed machine
None of the listed here
Has a damper winding
Has no losses

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Synchronous Motors
The induced e.m.f. in a synchronous motor working on leading power factor will be

equal to the supply voltage
None of these
less than the supply voltage
more than the supply voltage

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Synchronous Motors
Dust and dirt accumulation on motor winding will result in

Increased core losses
Eddy current flow
Rise in winding temperature
Shorting of coils

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Synchronous Motors
Most of the synchronous motors are _______ power factor metors.

0.8 leading
0.8 lagging
Unity
0.5 leading

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