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

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

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DC Generators
When two D.C. series generators are running in parallel, an equalizer bar is used

So that two similar machines will pass approximately equal currents to the load
To reduce the combined effect of armature reaction of both machines
To increase the series flux
To increase the speed and hence generated e.m.f.

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