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Alternators

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

One fourth
Half
Unchanged
Double

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Alternators
The stator of an alternator is identical to that of a ______

Roserberg generator
Dc generator
3-phase induction motor
1-phase induction motor

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Alternators
The rotor of a turbo alternator is made cylindrical in order to reduce_______

Eddy current loss
Windage loss
Hysteresis loss
None of the listed here

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Alternators
Three phase alternators are invariably star commected because

Higher terminal voltage is obtained
Magnetic losses are the minimum
Small conductors can be used
Less turns of wire are required

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Alternators
In an alternator, armature reaction is considered equivalent to

Fictitious conductance
Fictitious resistance
Fictitious reactance
Fictitious impedance

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Alternators
The disadvantaged of a short pitched coil is that _______

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

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