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DC Generators

DC Generators
A shunt generator gives its greatest voltage at

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

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DC Generators
Carbon brushes are used in a dc machine because _______

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

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DC Generators
In a D.C. machine stray loss is the sum of

Shunt field copper loss and mechanical loss
Total copper loss and mechanical loss
Iron loss and mechanical loss
Armature copper loss and iron loss

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DC Generators
The armature of dc generator is laminated to

Reduce eddy current loss
Insulate the core
Reduce the bulk
Provide the bulk

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DC Generators
The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is

8
2
6
4

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DC Generators
The real working part of a dc machine is the ______

Field winding
None of the listed here
Commutator
Armature winding

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