Synchronous Motors
A synchronous motor can be made self starting by providing

Damper winding on rotor poles
Damper winding on stator as well as rotor poles
Damper winding on stator
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
synchronous motor runs at synchronous speed
mechanical load on the motor can be adjusted
stator supply is relieved of responsibility of producing magnetic field

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