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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.

2
0.5
6
5

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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______

Motor input
Supply lines
Dc source
Armature input

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

one minute
one second
None of these
one hour

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Synchronous Motors
Slip rings in a synchronous motor carry

Alternating current
No current
All of the listed here
Direct current

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Synchronous Motors
The ratio of starting torque to running torque in a synchronous motor is

Infinity
One
Zero
Two

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Synchronous Motors
The speed of a synchronous motor

Decreases as the load decreases
Increases as the load increases
Always remains constant
None of the listed here

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