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Alternators

Alternators
In huge alternators, the moving part is

Poles
Brushes
None of the listed here
Armature

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Alternators
Voltage regulation of an alternator is usually

Much higher than that of a power transformer
Equal to that of power transformer
None of the listed here
Much lower than that of power transformer

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Alternators
If the excitation of an alternator operating in parallel with other alternators is decreased, its ______

None of the listed here
Pf becomes more leading
Output kW will change
Pf becomes more lagging

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

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

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Alternators
When two alternators are running in exact synchronism, the synchronising power will be

Sum of the output of two
Unity
Zero
None of the listed here

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Alternators
In an alternator, the effect of armature reaction is minimum at power factor of ______

0.866 lagging
Unity
0.866 leading
0.5 lagging

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MORE MCQ ON Alternators

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