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Alternators

Alternators
Which of the following prime movers is the least efficient?

Gas turbine
Steam engine
Steam turbine
Diesel engine

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Alternators
Zero power factor method for alternator is generally used to determine

Efficiency of alternator
Voltage regulation of the alternator
Synchronous impedance of alternator
None of the listed here

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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
Unchanged
Half

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Alternators
In an alternator the armature reaction is mainly influenced by

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

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

Low speed
None of the listed here
High speed
Medium speed

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Alternators
The losses in an alternator are the same as in

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

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