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Synchronous Motors

Synchronous Motors
A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______

16
36
30
None of the listed here

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Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

By changing the applied voltage
By changing the supply frequency
By interchanging any two phases
By changing the load

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

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

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Synchronous Motors
For reciprocating compressor, the synchronous motor is designed to have pull in torque of about ______ times the full load torque.

6
2
0.5
5

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Synchronous Motors
A synchronous motor can develop synchronous torque

only at synchronous speed
when under loaded
below or above synchronous speed
while over-excited

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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will not come upto speed
Will fail to pull into step
Will overheat in spots
Will refused ro start

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