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Synchronous Motors

Synchronous Motors
The maximum speed variation in a 3 phase synchronous motor is

2 percent
Zero
4 percent
10 percent

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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
Decreases
Remains unchanged
Increases

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Synchronous Motors
A synchronous motor runs at speed ranging from ______

3600 to 6000 rpm
150 to 1800 rpm
None of the listed here
1800 to 3600 rpm

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Synchronous Motors
A synchronous machine with low value short circuit ratio has

High stability limit
Good voltage regulation
Lower stability limit
Good speed regulation

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Synchronous Motors
In order to to reverse the direction of a synchronous motor, _______

Reduce dc field excitation to zero
None of the listed here
Interchange any two stator lines
Change supply frequency

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Synchronous Motors
A synchronous motor can be started by

Pony motor
Provinding damper winding
Dc compound motor
All of the listed here

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