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Alternators

Alternators
When load on an alternator is increased, the terminal voltage increases if the load pf is ______

Lagging
Zero
Leading
Unity

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Alternators
If the number of poles of an alternator is increased, the generated emf

Decreases
Remains the same
Increases
None of the listed here

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Alternators
In an alternator, armature reaction is considered equivalent to

Fictitious conductance
Fictitious resistance
Fictitious impedance
Fictitious reactance

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

0.5 lagging
Unity
0.866 leading
0.866 lagging

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Alternators
In an alternator, the stator frame serves

To hold the armature stampings
To verticate the armature
As a return path for the flux
To protect the whole machine

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Alternators
The slip rings emplyod in a 3-phase alternator in hydro station are insulated for

Full armature voltage
Extra high tension voltage
Low voltage
Very low voltage

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