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DC Generators

DC Generators
The armature copper loss in a dc generator is a

Constant loss
Stray loss
Variable loss
None of the listed here

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DC Generators
In a practical dc generator, mechanical efficiency is

More than electrical efficiency
Equal to electrical efficiency
Less than electrical efficiency
None of the listed here

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DC Generators
The yoke of a dc machine carries ______ pole flux.

One-half of
Two times the
Three times
None of the listed here

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DC Generators
In a dc generator, armature reaction _____ pole tip.

Weaknes the flux at the leading
None of the listed here
Weaknes the flux at the trailing
Strengthns the flux at the leading

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DC Generators
The commutator of a dc generator acts as

A rectifier
An amplifier
None of the listed here
A load

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DC Generators
In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when

There is no load on the generator
The generator runs on full load
The generator runs on overload
The generator runs on designed speed

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