DC Generators
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by

Using conductor of annealed copper
Using carbon brushes of superior quality
Using commutator with large number of segments
Using equalizer rings

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DC Generators
Wave winding is composed of

Any odd number of conductors
Any even number of conductors
That even number which is exact multiple of poles
That even number which is exact multiple of poles + 2

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