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Synchronous Motors

Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

lagging
zero
leading
unity

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Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.

5 to 10
1.25 to 3.5
6 to 9
0.5

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Synchronous Motors
When the synchronous motor is pulled out of synchronism, the stator current _______

Becomes zero
Remains unchanged
Is decreased too much
Is increased too much

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Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor

Remains constant at all loads
Varies with power factor
Varies with speed
Varies with the load

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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________

30° electrical
45° electrical
0° electrical
90° electrical

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Synchronous Motors
When a synchronous motor is pulled out of synchronism, the stator current ________

Become zero
Remains unchanged
Is decreased too much
Is increased too much

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