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Alternators

Alternators
Turbo alternator are generally used to run at

3000 rpm
15000 rpm
5000 rpm
1500 rpm

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Alternators
Which of the following prime movers is the least efficient?

Steam engine
Steam turbine
Gas turbine
Diesel engine

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Alternators
Damper windings are used in alternators to

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

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Alternators
In aircrafts, alternators have operating frequency of

50 Hz
60 Hz
800 Hz
400 Hz

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Alternators
Hydrogen is used in large alternators mainly to

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

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Alternators
The salient pole construction for field structure of an alternator is generally used for ______ machine.

2-pole
8-pole
4-pole
None of the listed here

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