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DC Generators

DC Generators
Brushes of D.C. machines are made of

All of above
Soft copper
Carbon
Hard copper

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DC Generators
The rapid wear of brushes takes place due to

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

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DC Generators
A shunt generator gives its greatest voltage at

No load
Half full load
Full load
None of the listed here

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DC Generators
Magnetic field in a D.C. generator is produced by

None of these
Electromagnets
Both (A) and (B)
Permanent magnets

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DC Generators
Due to armature reaction, the main pole flux of a dc generator is

Distorted only
None of the listed here
Weakened as well as distorted
Weakend only

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DC Generators
The commutator of a dc generator acts as

A load
A rectifier
None of the listed here
An amplifier

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