DC Generators
The efficiency of a dc generator is maximum when its variable loss is

Equal to Constant loss
Equal to half of constant loss
Equal to double the constant loss
None of the listed here

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

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

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