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Armature reaction at 90^0 to the main field is called as ____________

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Armature reaction at 90^0 to the main field is called as ____________

(a) Demagnetizing mmf

(b) Cross-magnetizing mmf

(c) Anti-magnetizing mmf

(d) Magnetizing mmf

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Asked question is from Armature Reaction -1 topic in portion Armature Reaction of DC Machines

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The correct option is (c) Anti-magnetizing mmf

Explanation: The armature reaction flux strengthens each main pole at one end and weakens it at the other end (cross magnetizing effect). Armature reaction with axis at 90° to the main field axis is known as cross-magnetizing mmf.

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