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Synchronous Motors

Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

leading
unity
zero
lagging

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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______

Armature input
Dc source
Supply lines
Motor input

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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
If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

it runs at a very high speed
it runs at a slower speed
it continues to run at the same speed
the motor stops

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Synchronous Motors
A synchronous motor runs at only one speed because it ______

Is a doubly fed machine
Has a damper winding
None of the listed here
Has no losses

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Synchronous Motors
A synchronous motor will always stop when

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

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