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Alternators

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

0.866
0.707
0.6
0.2

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Alternators
The full load efficiency of an alternator _______with increases in speed.

Decreases
None of the listed here
Remains unchanged
Increases

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Alternators
The stator of an alternator is identical to that of a ______

1-phase induction motor
3-phase induction motor
Dc generator
Roserberg generator

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Alternators
The speed of a salient pole machine is nearly

500 rpm
1000 rpm
3000 rpm
1500 rpm

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Alternators
In an alternator, the armature reaction will be completely magnetizing in case the load power factor is

Zero lagging
0.866
Unity
Zero leading

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Alternators
Damper windings are used in alternators to

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

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