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Alternators

Alternators
Turbo alternator are generally used to run at

3000 rpm
15000 rpm
5000 rpm
1500 rpm

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Alternators
The losses in an alternator are the same as in

A transformer
A dc machine
A rectifier
None of the listed here

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Alternators
The voltage regulation of an alternator for a pf of 0.8 lagging is _______at unity pf.

None of the listed here
Greater than
Smaller than
The same as

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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
0.6
0.2

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Alternators
The synchronous reactance of an alternator is generally _______ armature resistance.

5 times smaller than
10 times smaller than
10 to 100 times greater than
5 times greater than

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Alternators
In air-crafts, alternators have operating frequency of

400 Hz
60 Hz
500 Hz
50 Hz

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