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

None of the listed here
Damper winding on stator
Damper winding on stator as well as rotor poles
Damper winding on rotor poles

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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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