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Synchronous Motors

Synchronous Motors
In a synchronous motor which loss varies with load ?

Bearing friction loss
Core loss
Copper loss
Windage loss

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Synchronous Motors
The speed regulation of a synchronous motor is always

1%
Positive
Zero
0.5%

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Synchronous Motors
In case one phase of a three-phase synchronous motor is short-circuited the motor will

run with excessive vibrations
run at 2/3 of synchronous speed
take less than the rated load
not start

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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes

Motor speed
Applied voltage of the motor
Any of the above
Power factor of power drawn by the motor

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

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

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Synchronous Motors
In a synchronous motor, the maximum power developed depends on all of the following except

supply voltage
rotor excitation
maximum value of coupling angle
direction of rotation

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