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Synchronous Motors

Synchronous Motors
A synchronous motor can be started by

All of the listed here
Dc compound motor
Pony motor
Provinding damper winding

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Synchronous Motors
A synchronous motor can operate at

Lagging power factor only
Unity power factor only
Lagging, leading and unity power factors
Leading power factor

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

kW rating
None of the listed here
kVA rating
kVAR rating

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

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

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Synchronous Motors
A synchronous machine with low value of short-circuit ratio has

lower stability limit
high stability limit
good voltage regulation
good speed regulation

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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______

None of the listed here
Mechanical load
Supply frequency
Field excitation

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MORE MCQ ON Synchronous Motors

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