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Alternators

Alternators
In a cylindrical rotor how much portion of the rotor is wound?

Half
Two third
Full
One third

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Alternators
Turbo alternator are generally used to run at

1500 rpm
3000 rpm
15000 rpm
5000 rpm

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Alternators
The frequency of the system with which several alternators are paralleled can be increased of by simultaneously _______ of all generators.

Increasing the field excitation
Increasing the speed of prime movers
Decreasing the speed of prime movers
Decreasing the field excitation

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Alternators
Damper windings are used in alternators to

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

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Alternators
A turbo alternator uses ________

Rotating ac machine winding
Nonsalient pole field structure
None of the listed here
Salient pole field structure

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Alternators
The disadvantaged of a short pitched coil is that _______

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

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