Armature reaction of an unsaturated D.C. machine is_____________?
Correct answer: A. crossmagnetising
- A. crossmagnetising
- B. demagnetising
- C. magnetising
- D. none of above
Explanation
For an unsaturated machine, the armature-reaction flux mainly acts at right angles to the main field and distorts it, so it is cross-magnetising. Demagnetising action becomes significant when brush shift and magnetic saturation are considered.
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