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

equal
more
twice
less

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

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