DC Generators
The main drawback of a dc shunt generator is that

It is expensive
Terminal voltage drops considerably
Generated voltage is small
Shunt field circuit has high resistance

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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 armature reaction flux
None of these
Neutralize the commutating self induced e.m.f.

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