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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DC Generators
When two D.C. generators are running in parallel an equalizer bar is used

So that the two identical machines will pass approximately equal currents to the load
To increase the generated e.m.f.
To increase the series flux
To reduce the combined effect of armature reaction of both the machines

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