Synchronous Motors
A synchronous motor runs at only one speed because it ______

Has no losses
Is a doubly fed machine
Has a damper winding
None of the listed here

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

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

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