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Alternators

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

Steam engine
Steam turbine
Gas turbine
Diesel engine

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Alternators
If the excitation of an alternator operating in parallel with other alternators is decreased, its ______

Pf becomes more leading
None of the listed here
Output kW will change
Pf becomes more lagging

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Alternators
An alternator supplying power to a load with a leading power factor always has ______ voltage regulation.

Negative
Positive
Unity
Zero

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Alternators
Modern 3-phase alternator of a central power station will have generated voltage of

400 V
230 V
132 kV
11 kV

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Alternators
In an alternator, the stator frame serves

To verticate the armature
As a return path for the flux
To hold the armature stampings
To protect the whole machine

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Alternators
The airgap in an alternator is ________ in an induction motor.

About same as
Much shorter than
None of the listed here
Much longer than

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