DC Generators
The main factor which leads to unstable parallel operation of flat and over compounded generators is

unequal series field resistances
their rising voltage characteristics
unequal speed regulation of their primemovers
unequal number of turns in their series field windings

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the armature reaction flux
None of these
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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