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Synchronous Motors

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

None of these
one second
one minute
one hour

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Synchronous Motors
A synchronous motor will always stop when

Supply voltage fluctuates
Load in motor varies
Supply voltage frequency changes
Excitation winding gets disconnected

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Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.

None of the listed here
Increase
Remain unchanged
Decrease

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Synchronous Motors
The speed of a synchronous motor

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

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Synchronous Motors
Synchronous motors are generally used in application requiring _______

Variable speed
Sudden application of heavy loads
Infrequent starting
Frequent stopping

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

kVAR rating
kW rating
None of the listed here
kVA rating

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