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Synchronous Motors

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

armature input
motor input
supply lines
c. source

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Synchronous Motors
The operating speed of a synchronous motor can be changed to new fixed value by

using brakes
changing the supply voltage
changing frequency
changing the load

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Synchronous Motors
A synchronous motor can be made self starting by providing

None of the listed here
Damper winding on stator as well as rotor poles
Damper winding on stator
Damper winding on rotor poles

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

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

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Synchronous Motors
In a synchronous motor, the magnitude of stator back emf depends on _____

Dc excitation only
Speed of the rotor
Both the speed and rotor flux
Load on the motor

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Synchronous Motors
A synchronous motor will always stop when

Supply voltage fluctuates
Excitation winding gets disconnected
Supply voltage frequency changes
Load in motor varies

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