DC Generators
In D.C. generators the polarity of the interpoles

Is opposite to that of the main pole ahead
Is the same as that of the main pole ahead
Is the same as that of the immediately preceding pole
Is neutral as these poles do not play part in generating e.m.f.

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

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

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