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

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

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DC Generators
Lap 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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