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Synchronous Motors

Synchronous Motors
The back emf in the stator of a synchronous motor depends on

Flux density
Rotor excitation
None of the listed here
Rotor 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 very high speed
the motor stops
it runs at a slower speed
it continues to run at the same speed

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

High stability limit
Good voltage regulation
Good speed regulation
Lower stability limit

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Synchronous Motors
For the same active power consumed, the stator current of a synchronous motor is ______ that of a 3 phase induction motor.

None of the listed here
The same as
Less than
More than

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Synchronous Motors
Slip rings in a synchronous motor carry

Alternating current
No current
Direct current
All of the listed here

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Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range

99 to 99.5%
85 to 95%
75 to 80%
60 to 70%

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MORE MCQ ON Synchronous Motors

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