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Alternators

Alternators
The rating of an alternator is expressed in______

kW
kVA
HP
kVAR

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

Four times
One-fourth
Twice
Half

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Alternators
The disadvantaged of a short pitched coil is that _______

Voltage round the coil is reduced
Waveform becomes non-sinusoidal
None of the listed here
Harmonics are introduced

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Alternators
Turbo alternator are generally used to run at

15000 rpm
5000 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

Unity
0.866
Zero leading
Zero lagging

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Alternators
The number of poles in turbo alternators is usually

12
2
4
50

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