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Run-away for large DC machine is avoided by using _________

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Run-away for large DC machine is avoided by using _________

(a) a turn or two of cumulative compounding

(b) compensating winding

(c) stablizer winding

(d) all of the mentioned

I have been asked this question in class test.

This is a very interesting question from Speed Control of DC Motors topic in chapter DC Motors of Electrical Machines

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The correct choice is (b) compensating winding

The best I can explain: The runaway in large machine is avoided by using compensating winding.

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