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

To reduce the combined effect of armature reaction of both the machines
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

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DC Generators
Inter-pole flux should be sufficient to

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
Neutralize the commutating self induced e.m.f.

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DC Generators
Wave 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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