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Synchronous Motors

Synchronous Motors
Slip rings in a synchronous motor carry

Alternating current
Direct current
No current
All of the listed here

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

Decreases
Remains unchanged
None of the listed here
Increases

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Synchronous Motors
The rotor of a synchronous motor is

None of the listed here
Identical to that of a dc motor
Nonsalient pole type
Salient pole type

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Synchronous Motors
Dust and dirt accumulation on motor winding will result in

Eddy current flow
Shorting of coils
Rise in winding temperature
Increased core losses

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

Zero
10 percent
4 percent
2 percent

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Synchronous Motors
When a unity pf synchronous motor is operated at a leading pf, it results in _______

None of the listed here
Less than rated horsepower output
More than rated horseppwer output
More than rated rotor current

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