Compensating windings are used in D.C. generators______________?
Correct answer: C. to neutralise the cross-magnetising effect of the armature reaction
- A. mainly to reduce the eddy currents by providing local short-circuits
- B. to provide path for the circulation of cooling air
- C. to neutralise the cross-magnetising effect of the armature reaction
- D. none of the above
Explanation
Compensating windings are placed in the pole faces and carry armature current, producing an opposing mmf that neutralizes the cross-magnetizing effect of armature reaction. Eddy-current reduction and cooling-air circulation are unrelated functions.
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