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For a 220-V level compound generator the terminal voltage at the half load is?

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For a 220-V level compound generator the terminal voltage at the half load is?

(a) more than 220-V

(b) same as no-load voltage

(c) more than no-load voltage

(d) lesser than no-load voltage

I had been asked this question in an interview.

My question is from Operating Characteristics of DC Generators in chapter DC Generators of Electrical Machines

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The correct answer is (b) same as no-load voltage

To explain I would say: In a level compound dc generator the terminal voltage remains same as no load voltage at all the loading.

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