Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is

twice
less
equal
more

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

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

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