Synchronous Motors
The minimum armature current of the synchronous motor corresponds to operation at

0.707 power factor leading
zero power factor leading
0.707 power factor lagging
unity power factor

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

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

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