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Synchronous Motors

Synchronous Motors
The rotor copper losses, in a synchronous motor, are met by

c. source
supply lines
armature input
motor input

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

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

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Synchronous Motors
Damper winding in a synchronous motor________

Reduces windage losses
Serves to start the motor
Improve pf of the motor
Increases hunting of the motor

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Synchronous Motors
A synchronous motor develop maximum power when load angle is

45°
120°
60°
90°

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Synchronous Motors
Hunting in a synchronous motor can not be due to

Variable supply frequency
Variable load
Windage friction
Variable frequency

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

3600 to 6000 rpm
1800 to 3600 rpm
None of the listed here
150 to 1800 rpm

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