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SYNCHRONOUS MOTORS

Synchronous Motors
When pull-out torque occurs in a synchronous motor, the poles of the rotor are _______

45° (electrical) behind stator poles
Mid way between N and S poles of stator
None of the listed here
Coincident with statorbpoles

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Synchronous Motors
The mechanical power developed by a synchronous motor is ______ stator voltage.

Directly proportional to square of
Invesely proportional to
Directly proportional to
Independent of

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Synchronous Motors
The mechanical power developed by a synchronous motor is independent of _________.

Speed
Torque angle
Field excitation
Applied stator voltage

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Synchronous Motors
When a synchronous motor is pulled out of synchronism, the stator current ________

Is increased too much
Remains unchanged
Is decreased too much
Become zero

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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______

None of the listed here
Reduce dc field excitation to zero
Change supply frequency
Interchange any two stator lines

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