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The air gap line represents _________

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The air gap line represents _________

(a) magnetic behaviour of the air gap of the dc machine

(b) magnetic behaviour of the air gap of the induction machine

(c) magnetic behaviour of the iron core

(d) all of the mentioned

The question was posed to me in quiz.

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

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Correct choice is (a) magnetic behaviour of the air gap of the dc machine

To explain I would say: Air gap line in the magnetization curve represents the ideal nature of the machine considering no saturation for the dc machine.

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