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
the motor stops
it runs at a slower speed
it runs at a very high speed

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Synchronous Motors
The power factor of a synchronous motor is better than that of induction motor because

stator supply is relieved of responsibility of producing magnetic field
mechanical load on the motor can be adjusted
synchronous motor runs at synchronous speed
synchronous motor has large air gap

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