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Synchronous Motors

Synchronous Motors
The shaft of synchronous motor is made of

Mild steel
Chrome steel
Alcino
Stainless steel

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Synchronous Motors
The speed of a synchronous motor can be changed by varying _______

None of the listed here
Supply frequency
Mechanical load
Field excitation

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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.

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

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Synchronous Motors
A synchronous machine with large air gap has

all of the listed here
a small value of inherent regulation
a higher synchronizing power which makes the machine less sensitive to load variations
a higher value of stability limit

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Synchronous Motors
Synchronous motors are generally used in application requiring _______

Sudden application of heavy loads
Infrequent starting
Frequent stopping
Variable speed

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

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

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