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Synchronous Motors

Synchronous Motors
Slip rings in a synchronous motor carry

Direct current
No current
Alternating current
All of the listed here

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

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

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Synchronous Motors
A synchronous motor develops maximum power when load angle is

60°
120°
45°
90°

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Synchronous Motors
The rotor of a synchronous motor is

Nonsalient pole type
Salient pole type
None of the listed here
Identical to that of a dc motor

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Synchronous Motors
In a synchronous motor, the maximum power developed depends on all of the following except

rotor excitation
maximum value of coupling angle
direction of rotation
supply voltage

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

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

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