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Synchronous Motors

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

Dc source
Armature input
Supply lines
Motor input

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

High stability limit
Good voltage regulation
Lower stability limit
Good speed regulation

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Synchronous Motors
Hunting in a synchronous motor can not be due to

Variable supply frequency
Variable load
Windage friction
Variable frequency

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Synchronous Motors
A synchronous motor can be started by

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

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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______

Interchange any two stator lines
Change supply frequency
None of the listed here
Reduce dc field excitation to zero

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Synchronous Motors
A synchronous motor with large air gap has

A small value of inherent regulation
A higher value of stability limit
A higher synchronizing power which makes the machine less sensitive to load variations
All of the listed here

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