Synchronous Motors
A synchronous motor runs at speed ranging from ______

150 to 1800 rpm
1800 to 3600 rpm
3600 to 6000 rpm
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 increased load has to take more current
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

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