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Synchronous Motors

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

VAR
MVAR
kVAR
None of the listed here

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Synchronous Motors
A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______

30
36
16
None of the listed here

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Synchronous Motors
A synchronous motor is a ______ motor.

Variable pf
Singly fed
Variable speed
None of the listed here

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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that

its speed may be controlled more easily
None of these
its power factor may be varied at will
its speed is independent of supply frequency

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Synchronous Motors
Synchronous motor always run at

None of the listed here
Less than synchronous speed
More than synchronous speed
The synchronous speed

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Synchronous Motors
Small synchronous motors are started by _______

None of the listed here
Damper winding
Pony motor
Variable frequency source

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