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

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

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Synchronous Motors
As the load is applied to a synchronous motor, the motor takes more armature current because

The back e.m.f. decreases causing an increase in motor current
The rotor by shifting its phase backward causes motor to take more current
The rotor strengthens the rotating field causing more motor current
The increased load has to take more current

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