DC Generators
In a dc machine, the number of commutator segment is equal to

Twice the number of poles
None of the listed here
Number of coils
Numbers of conductors

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DC Generators
Lap winding is composed of

That even number which is exact multiple of poles
Any odd number of conductors
Any even number of conductors
That even number which is exact multiple of poles + 2

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the armature reaction flux
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

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