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Synchronous Motors

Synchronous Motors
Most of the synchronous motors are _______ power factor metors.

Unity
0.8 leading
0.8 lagging
0.5 leading

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Synchronous Motors
A rotary converter can also be run as a

Dc series generator
Dc shunt generator
Dc compound generator
Synchronous motor

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Synchronous Motors
A synchronous motor delivers reactive power when ______

Under excited
Over excited
None of the listed here
Normally excited

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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is

less
more
twice
equal

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Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will fail to pull into step
Will refused ro start
Will not come upto speed
Will overheat in spots

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Synchronous Motors
The rotor of a synchronous motor is

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

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