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Alternators

Alternators
Turbo alternator are generally used to run at

5000 rpm
1500 rpm
15000 rpm
3000 rpm

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Alternators
The synchronous reactance of an alternator is due to ______

Armature reaction
None of the listed here
Leakage flux
Dc field excitation

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Alternators
The speed of an alternator is changed from 3000 rpm to 1500 rpm. The generated emf/phase will become

Unchanged
Double
One fourth
Half

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

Remains unchanged
Increases
Decreases
None of the listed here

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Alternators
Copper losses of an alternator can be measured by

Rectifier
None of the listed here
Transformer
Dc motor

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Alternators
The field winding of an alternator is _____ excited.

AC
DC
None of the listed here
Both DC and AC

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