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Alternators

Alternators
When the speed of an alternator is reduced by half, the generated emf will become

One-fourth
Twice
Four times
Half

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Alternators
Damper windings are used in alternators to

Reduce windage loss
Prevenent hunting
None of the listed here
Achieve synchronism

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Alternators
Voltage regulation of an alternator is usually

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

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Alternators
The voltage regulation of an alternator depends on

Load current only
Power factor only
Both load current and pf
None of the listed here

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Alternators
The speed of a salient pole machine is nearly

500 rpm
3000 rpm
1500 rpm
1000 rpm

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Alternators
The salient pole construction for field structure of an alternator is generally used for ______ machine.

8-pole
None of the listed here
2-pole
4-pole

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