If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?
Correct answer: C. crossmagnetisation as well as demagnetising
- A. demagnetisation only
- B. cross magnetisation as well as mag¬netisation
- C. crossmagnetisation as well as demagnetising
- D. cross magnetisation only
Explanation
Moving the brushes away from the geometrical neutral axis tilts the armature-reaction axis, resolving it into both a cross-magnetising component and a demagnetising component. Thus brush shifting does not produce demagnetisation alone.
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