Synchronous Motors
While running, a synchronous motor is compelled to run at synchronous speed because of _______

Magnetic locking between stator and rotor poles
Compulsion due to lenz's law
Damper winding in its pole faces
Induced emf in rotor field winding by stator flux

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

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