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DC GENERATORS

DC Generators
In D.C. generators, current to the external circuit from armature is given through

None of above
Solid connection
Commutator
Slip rings

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DC Generators
In a four-pole D.C. machine

All the four poles are north poles
Two north poles follow two south poles
Alternate poles are north and south
All the four poles are south poles

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DC Generators
The voltage drop for which of the following types of brush can be expected to be least?

None of these
Graphite brushes
Carbon brushes
Metal graphite brushes

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

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

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DC Generators
Number of tapings for each equalizer ring is equal to

Number of pole pairs
Number of commutator segments
Number of parallel paths
Number of poles

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