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Synchronous Motors

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

0.8 lagging
0.8 leading
Unity
None of the listed here

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Synchronous Motors
The size of a synchronous motor decreases with the increase in

All of the listed here
Speed
Horse power rating
Flux density

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Synchronous Motors
An over excited synchronous motor is used for

Power factor corrections
Variable speed loads
Low torque loads
Fluctuating loads

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

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

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Synchronous Motors
Mostly, synchronous motors are of

Salient pole type machines
Induction type machines
Smooth cylindrical type machines
Alternator type machines

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Synchronous Motors
The shaft of synchronous motor is made of

Chrome steel
Mild steel
Alcino
Stainless steel

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