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Synchronous Motors

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

6
5
2
0.5

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Synchronous Motors
When the synchronous motor runs at synchronous speed, the voltage induced in the damper winding is _____

Zero
Maximum
None of the listed here
minimum

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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____

Approches half synchronous speed
Is at standstill
None of the listed here
Approches synchronous speed

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

16
None of the listed here
36
30

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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about

None of these
one hour
one second
one minute

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

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

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