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Alternators

Alternators
For producing an emf of given frequency, an alternator will run at greatest speed for _____ poles.

12
8
4
2

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Alternators
The alternators driven by _______ do not have a tendency to hunt.

Diesel engines
Water turbines
None of the listed here
Steam turbines

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Alternators
Damper windings are used in alternators to

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

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Alternators
The disadvantaged of a short pitched coil is that _______

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

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Alternators
An alternator is somtimes called _______ generator.

Synchronous
Asynchronous
Rosenberg
None of the listed here

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

Double
One fourth
Unchanged
Half

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