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Synchronous Motors

Synchronous Motors
The capacity of a synchronous capacitor is generally in the range of

kVAR
MVAR
VAR
None of the listed here

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Synchronous Motors
Synchronous motors are generally used in application requiring _______

Frequent stopping
Variable speed
Sudden application of heavy loads
Infrequent starting

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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 machine with large air gap has

a higher value of stability limit
a higher synchronizing power which makes the machine less sensitive to load variations
a small value of inherent regulation
all of the listed here

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Synchronous Motors
The size of a synchronous motor is determined by its _____

kW rating
None of the listed here
kVA rating
kVAR rating

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Synchronous Motors
Damper winding in a synchronous motor________

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

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