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Alternators

Alternators
In an alternator, for a coil having a span of 2/3 of pole pitch, the coil span factor will be

0.707
0.866
0.2
0.6

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Alternators
A two pole alternator is running at 1500 rpm. Its angular velocity is ______

192 rad/s
212 rad/s
157 rad/s
118 rad/s

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Alternators
In an alternator the armature reaction is mainly influenced by

The power factor of the load
Short circuit ratio
Total current drawn
Speed of the alternator

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

One fourth
Double
Half
Unchanged

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Alternators
Turbo alternator are generally used to run at

5000 rpm
1500 rpm
3000 rpm
15000 rpm

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Alternators
Alternators are usually design to generate

Definite power factor
Definite frequencies
Definite currents
Variable frequncies

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