DC Generators
In a lap winding, the number of the brushes required is equal to

Number of pairs of poles
None of the listed here
Number of poles
Commutator pitch

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DC Generators
In D.C. generators the polarity of the interpoles

Is neutral as these poles do not play part in generating e.m.f.
Is the same as that of the immediately preceding pole
Is the same as that of the main pole ahead
Is opposite to that of the main pole ahead

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