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

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

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Synchronous Motors
Synchronous capacitor is

An over excited synchronous motor driving mechanical load
An over excited synchronous motor running without mechanical load
An ordinary static capacitor bank
None of the listed here

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