Synchronous Motors
If a synchronous motor is operating at a supply frequency of 50 cycles/second, then, rotor revolves at ______

25 cycles/ second
100 cycles/second
None of the listed here
50 cycles/second

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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
synchronous motor runs at synchronous speed
mechanical load on the motor can be adjusted

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