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Synchronous Motors

Synchronous Motors
The size of a synchronous motor decreases with the increase in

Horse power rating
Flux density
Speed
All of the listed here

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Synchronous Motors
When the field of a synchronous motor is under-excited, the power factor will be

unity
lagging
leading
zero

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

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

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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is

twice
equal
less
more

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Synchronous Motors
Damper winding in a synchronous motor________

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

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Synchronous Motors
The construction of a synchronous motor ressembles

A series motor
A rotary converter
An induction motor
An alternator

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