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Synchronous Motors

Synchronous Motors
If the field of a synchronous motor is underexcited, the power factor will be

leading
zero
lagging
unity

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Synchronous Motors
The ratio of starting torque to running torque in a synchronous motor is

Zero
Two
One
Infinity

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Synchronous Motors
The power factor correction capability of a loaded synchronous motor _____ with the increases in mechanical load.

None of the listed here
Increases
Decreases
Remains unchanged

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Synchronous Motors
A rotary converter can also be run as a

Dc series generator
Dc shunt generator
Synchronous motor
Dc compound generator

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

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

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Synchronous Motors
A synchronous motor with large air gap has

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

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