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Synchronous Motors

Synchronous Motors
Most of the synchronous motors are _______ power factor metors.

0.8 lagging
Unity
0.8 leading
0.5 leading

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

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

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Synchronous Motors
In a synchronous motor, the maximum power developed depends on all of the following except

rotor excitation
maximum value of coupling angle
direction of rotation
supply voltage

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Synchronous Motors
The rotor copper losses, in a synchronous motor, are met by

supply lines
c. source
motor input
armature input

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

Speed
Horse power rating
All of the listed here
Flux density

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Synchronous Motors
Mostly, synchronous motors are of

Smooth cylindrical type machines
Salient pole type machines
Alternator type machines
Induction type machines

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