DC Generators
Inter-pole flux should be sufficient to

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

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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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