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

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

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DC Generators
Lap winding is composed of

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

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

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

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the commutating self induced e.m.f.
Neutralize the armature reaction flux
None of these
Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil

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