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In DC generator, how armature reaction is produced?

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in DC Machines by (506k points)
In DC generator, how armature reaction is produced?

(a) Its field current

(b) Armature conductors

(c) Field pole winding

(d) Load current in armature

This question was posed to me during an internship interview.

The origin of the question is Armature Reaction -1 topic in section Armature Reaction of DC Machines

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The correct choice is (d) Load current in armature

Easy explanation: When the armature of a dc machine carries current i.e. load current in armature, the distributed armature winding produces its own mmf (distributed) known as armature reaction. The  tothe field ampere-turns (ATf) and armature ampere-turns (ATa).

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