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How compounding level in a compound machine is adjusted?

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How compounding level in a compound machine is adjusted?

(a) By adding variable resistance in series with series field resistance

(b) By adding variable resistance in parallel with series field resistance

(c) By adding fixed resistance in parallel with series field resistance

(d) By adding fixed resistance in series with series field resistance

I had been asked this question by my college professor while I was bunking the class.

This interesting question is from Characteristics of Separately Excited Generators in chapter DC Generator of DC Machines

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The correct choice is (b) By adding variable resistance in parallel with series field resistance

To explain I would say: When fixed resistance is added in parallel with series field resistance we get only one other compounding level. So, by adding variable resistance in parallel with series field we can get various other compounding levels.

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