DC Generators
Inter-pole flux should be sufficient to

Neutralize the armature reaction flux
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.
None of these

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

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

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