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Air gap line is drawn at iron _________

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Air gap line is drawn at iron _________

(a) Saturated

(b) Unsaturated

(c) Moderately saturated

(d) Variable saturation

I have been asked this question during an online exam.

This intriguing question originated from No Load with On Load Characteristics of DC Generator topic in division DC Generator of DC Machines

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The correct choice is (b) Unsaturated

For explanation: The extension of the liner portion of the magnetization curve, is known as the air-gap line as it represents mainly the magnetic behaviour of the machine’s air-gap, the iron being unsaturated in this region consumes negligible ampere-turns; in any case the effect of iron is also linear here.

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