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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

Double
Half
One fourth
Unchanged

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Alternators
The synchronous reactance of an alternator is due to ______

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

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Alternators
In an alternator, the frequency of voltage generated depend on

Number of poles only
Rotative speed only
Both rotative speed and number of poles
None of the listed here

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Alternators
An alternator coupled to which primemover will usually have the highest rotating speed?

Reciprocating diesel engine
Steam turbine
Francis turbine
Steam engine

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

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

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

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

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