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Flux density in the interpolar region drops down because of ______

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Flux density in the interpolar region drops down because of ______

(a) ATa (peak)

(b) Large air gap

(c) Absence of magnetic poles

(d) Depends on other parameters

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The question is from Armature Reaction topic in portion Armature Reaction of DC Machines

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The correct answer is (b) Large air gap

Easy explanation: The exact way to find the flux density owing to the simultaneous action of field and armature ampere-turns is to find the resultant ampere-turn distribution ATresultant(∅) = ATf(∅) + ATa(∅). The flux density of ATa(∅) which, because of large air-gap in the interpolar region, has a strong dip along the q-axis even though ATa(peak) is oriented along it.

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