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DC Generators

DC Generators
The brush voltage drop in dc machine is about _______

2 V
0.1 V
10 V
20 V

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DC Generators
The rapid wear of brushes takes place due to

Excessive spring pressure
Rough commutator bars
All of these
Abrasion from dust

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DC Generators
The effect of armature reaction is to

None of the listed here
Increase the total flux
Decrease the total flux
Make the air gap flux uniform

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DC Generators
In a practical dc generator, mechanical efficiency is

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

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

Constant loss
None of the listed here
Stray loss
Variable loss

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DC Generators
The efficiency of a dc generator means its

Overall efficiency
None of the listed here
Mechanical efficiency
Electrical efficiency

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