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Alternators

Alternators
Turbo alternator are generally used to run at

5000 rpm
3000 rpm
15000 rpm
1500 rpm

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Alternators
The synchronous reactance of an alternator is due to ______

Armature reaction
Dc field excitation
Leakage flux
None of the listed here

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Alternators
When two alternators are running in exact synchronism, the synchronising power will be

Sum of the output of two
Unity
None of the listed here
Zero

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Alternators
Turbo alternators have rotors of _______

Small diameter and long axial length
Large diameter and long axial length
Same diameter and axial length
Large diameter and small axial length

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Alternators
Which harmonic will be totally eliminate in an alternator by using a fractional pitch of 4/5 ?

Fifth
Third
Ninth
Seventh

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Alternators
In an alternator, the effect of armature reaction is minimum at power factor of ______

0.866 lagging
0.5 lagging
Unity
0.866 leading

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