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Synchronous Motors

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

kVA rating
kW rating
kVAR rating
None of the listed here

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

0.8 leading
None of the listed here
Unity
0.8 lagging

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Synchronous Motors
A three phase synchronous motor will have

One slip rings
Two slip rings
No slip rings
Three slip rings

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Synchronous Motors
In case one phase of a three-phase synchronous motor is short-circuited the motor will

take less than the rated load
run at 2/3 of synchronous speed
not start
run with excessive vibrations

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Synchronous Motors
In a synchronous motor which loss varies with load ?

Windage loss
Core loss
Copper loss
Bearing friction loss

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Synchronous Motors
An under excited synchronous motor behaves as_______

An inductor
A resistor
A capacitor
None of the listed here

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