DC Generators
In case of D.C. machine winding, number of commutator segments is equal to

Number of armature coil sides
Number of armature conductors
Number of armature coils
Number of armature turns

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

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

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