DC Generators
The main drawback of a dc shunt generator is that

It is expensive
Generated voltage is small
Shunt field circuit has high resistance
Terminal voltage drops considerably

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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 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

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