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Alternators

Alternators
The number of cycles generated in a 6-pole alternators in one revolution is _______

3
None of the listed here
50
6

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Alternators
The non salient field construction is used for _______ alternator.

Medium speed
Low speed
High speed
None of the listed here

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Alternators
The frequency of emf generated in an 8-pole alternator running at 900 rpm is ______

60 Hz
None of the listed here
120 Hz
50 Hz

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

More costly
Larger in size
More efficient
Operating at high rpm

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Alternators
Alternators are usually design to generate

Definite frequencies
Definite currents
Variable frequncies
Definite power factor

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Alternators
Hydrogen is used in large alternators mainly to

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

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