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Alternators

Alternators
In case of a uniformly distributed winding, the value of distribution factor is

0.85
0.65
0.76
0.995

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Alternators
For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles.

4
8
2
12

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Alternators
An under excited alternator supplies _______

Leading VAR
None of the listed here
No reactive power
Lagging VAR

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Alternators
In an alternator, for a coil having a span of 2/3 of pole pitch, the coil span factor will be

0.6
0.2
0.707
0.866

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Alternators
Three phase alternators are invariably star commected because

Higher terminal voltage is obtained
Less turns of wire are required
Small conductors can be used
Magnetic losses are the minimum

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Alternators
For the same rating, the size of low speed alternator is ______that of high speed alternator.

Less than
About the same as
None of the listed here
More than

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