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Synchronous Motors

Synchronous Motors
A synchronous motor is a ______ motor.

Singly fed
None of the listed here
Variable pf
Variable speed

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Synchronous Motors
The standard full-load power factor ratings for synchronous motors are

unity or zero
zero or 0.8 leading
unity or 0.8 lagging
unity or 0.8 leading

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

kVAR rating
None of the listed here
kVA rating
kW rating

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Synchronous Motors
The back e.m.f. of a synchronous motor depends on

load
speed
All of these
load angle

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Synchronous Motors
The speed of a synchronous motor

Decreases as the load decreases
Increases as the load increases
None of the listed here
Always remains constant

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Synchronous Motors
Hunting in a synchronous motor can not be due to

Windage friction
Variable load
Variable frequency
Variable supply frequency

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