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Synchronous Motors

Synchronous Motors
Slip rings in a synchronous motor carry

No current
All of the listed here
Alternating current
Direct current

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

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

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

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

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Synchronous Motors
The standard full-load power factor ratings for synchronous motors are

zero or 0.8 leading
unity or 0.8 lagging
unity or 0.8 leading
unity or zero

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Synchronous Motors
The armature current of a synchronous motor will be minimum for ______ power factor.

0.8 leading
0.8 lagging
None of the listed here
Unity

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

Zero
Infinity
One
Two

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