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Alternators

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

Gas turbine
Diesel engine
Steam turbine
Steam engine

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Alternators
In an alternator, armature reaction is considered equivalent to

Fictitious resistance
Fictitious conductance
Fictitious reactance
Fictitious impedance

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Alternators
An under excited alternator supplies _______

Leading VAR
Lagging VAR
None of the listed here
No reactive power

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Alternators
Turbo alternators are generally used to run at

1500 rpm
5000 rpm
3000 rpm
1500 rpm

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Alternators
In an alternator, the armature reaction will be completely magnetizing in case the load power factor is

0.866
Zero lagging
Unity
Zero leading

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Alternators
The frequency of the system with which several alternators are paralleled can be increased of by simultaneously _______ of all generators.

Increasing the speed of prime movers
Decreasing the field excitation
Decreasing the speed of prime movers
Increasing the field excitation

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