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DC Generators

DC Generators
The yoke of a dc machine is made of

Aluminum
Cast steel
Soft iron
Silicon steel

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

Soft copper
All of above
Carbon
Hard copper

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DC Generators
The rapid wear of brushes takes place due to

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

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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
Carbon brushes are used in a dc machine because _______

Contact resistance is decreased
Carbon lubricates and polishes the commutator
None of the listed here
Carbon is cheap

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DC Generators
A shunt generator gives its greatest voltage at

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

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