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Synchronous Motors

Synchronous Motors
A synchronous motor can be used as a synchronous capacitor when it is

Over loaded
Under excited
Under loaded
Over excited

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Synchronous Motors
The rotor of a synchronous motor is

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

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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 overheat in spots
Will refused ro start
Will not come upto speed

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Synchronous Motors
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

it runs at a slower speed
the motor stops
it runs at a very high speed
it continues to run at the same speed

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Synchronous Motors
A synchronous capacitor is an over excited motor running at ________

Half full load
None of the listed here
No load
Full load

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Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor

Varies with power factor
Varies with speed
Remains constant at all loads
Varies with the load

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MORE MCQ ON Synchronous Motors

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