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Alternators

Alternators
Which harmonic will be totally eliminate in an alternator by using a fractional pitch of 4/5 ?

Fifth
Third
Ninth
Seventh

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Alternators
The synchronous reactance of an alternator is generally _______ armature resistance.

10 times smaller than
5 times smaller than
10 to 100 times greater than
5 times greater than

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Alternators
Hydrogen is used in large alternators mainly to

Strengthen the magnetic field
Reduce eddy current losses
Reduce distortion of waveform
Cool the machine

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Alternators
The voltage regulation of an alternator for a pf of 0.8 lagging is _______at unity pf.

Greater than
The same as
None of the listed here
Smaller than

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Alternators
Damper windings are used in alternators to

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

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

Zero leading
Unity
0.866
Zero lagging

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