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Alternators

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

Diesel engine
Steam engine
Gas turbine
Steam turbine

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Alternators
The disadvantaged of a short pitched coil is that _______

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

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Alternators
In aircrafts, alternators have operating frequency of

800 Hz
60 Hz
400 Hz
50 Hz

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

Decreases
Remains unchanged
Increases
None of the listed here

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Alternators
A lower voltage alternator, for the same power rating, will be

Operating at high rpm
More costly
More efficient
Larger in size

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Alternators
The rating of an alternator is expressed in______

kW
kVAR
HP
kVA

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