Resultant ampere-turn distribution of a DC machine is given by _________(a) ATresultant(∅) = ATf (∅) – ATa(∅)(b) ATresultant(∅) = – ATf (∅) + ATa(∅)(c) ATresultant(∅) = -ATf (∅) – ATa(∅)(d) ATresultant(∅) = ATf (∅) + ATa(∅)The question was asked in an interview.Question is taken from Armature Reaction topic in chapter Armature Reaction of DC Machines

Resultant ampere-turn distribution of a DC machine is given by _______

1.	Resultant ampere-turn distribution of a DC machine is given by _________(a) ATresultant(∅) = ATf (∅) – ATa(∅)(b) ATresultant(∅) = – ATf (∅) + ATa(∅)(c) ATresultant(∅) = -ATf (∅) – ATa(∅)(d) ATresultant(∅) = ATf (∅) + ATa(∅)The question was asked in an interview.Question is taken from Armature Reaction topic in chapter Armature Reaction of DC Machines
Answer» The correct option is (d) ATresultant(∅) = ATf (∅) + ATa(∅) 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(∅), where ∅ is the ELECTRICAL SPACE angle.

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