Synchronous Motors
If one phase of a 3 phase synchronous motor is short circuited, motor

Will not come upto speed
Will refused ro start
Will fail to pull into step
Will overheat in spots

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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
stator supply is relieved of responsibility of producing magnetic field
synchronous motor runs at synchronous speed

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