DC Generators
In a D.C. generator

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

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the commutating self induced e.m.f.
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

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