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Alternators

Alternators
In aircrafts, alternators have operating frequency of

800 Hz
400 Hz
50 Hz
60 Hz

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Alternators
An under excited alternator supplies _______

Lagging VAR
None of the listed here
Leading VAR
No reactive power

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

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

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Alternators
Where the terminal voltage of an alternator falls on throwing of the load, it indicates that the load is purely

Capacitive
Inductive
None of the listed here
Resistive

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Alternators
If the excitation of an alternator operating in parallel with other alternators is decreased, its ______

Pf becomes more lagging
Output kW will change
None of the listed here
Pf becomes more leading

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Alternators
Damper windings are used in alternators to

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

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