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Synchronous Motors

Synchronous Motors
The rotor copper losses, in a synchronous motor, are met by

armature input
motor input
supply lines
c. source

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Synchronous Motors
A synchronous motor can develop synchronous torque

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

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Synchronous Motors
The speed regulation of a synchronous motor is always

Positive
1%
Zero
0.5%

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Synchronous Motors
The size of a synchronous motor is determined by its _____

kVAR rating
None of the listed here
kVA rating
kW rating

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

one second
one minute
one hour
None of these

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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
0.5
5
2

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