DC Generators
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except

Dummy coils
Interpoles
Compensating winding
Shifting of axis of brushes

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DC Generators
Inter-pole flux should be sufficient to

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.
Neutralize the armature reaction flux
None of these

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