DC Generators
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to

increase the field resistance
reverse the field connections
increase the speed of primemover
check armature insulation resistance

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DC Generators
Inter-pole flux should be sufficient to

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
Neutralize the armature reaction flux
None of these

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