DC Generators
In a D.C. generator

Internal characteristic = magnetization characteristic ohmic drop
Magnetization characteristic = external characteristic
External resistance = internal characteristic armature reaction
External characteristic = magnetization characteristic ohmic drop armature reaction

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DC Generators
Inter-pole flux should be sufficient to

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

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