DC Generators
The essential condition for parallel operation of two D.C. generators is that they have

Same percentage regulation
Same kW rating
The same drooping voltage characteristics
The same operation r.p.m.

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DC Generators
Lap winding is composed of

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

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