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Alternators

Alternators
The speed of a salient pole machine is nearly

3000 rpm
1500 rpm
500 rpm
1000 rpm

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Alternators
The disadvantaged of a short pitched coil is that _______

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

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Alternators
In air-crafts, alternators have operating frequency of

50 Hz
60 Hz
400 Hz
500 Hz

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Alternators
Modern 3-phase alternator of a central power station will have generated voltage of

132 kV
400 V
11 kV
230 V

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Alternators
The stator of an alternator is wound for _______on the rotor.

More number of poles than
None of the listed here
The same number of poles as
Less number of poles than

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Alternators
The field winding of an alternator is _____ excited.

DC
AC
None of the listed here
Both DC and AC

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