Q.

The compensating windings in a DC machine are placed in the slots in the pole faces to neutralize the

  • ACross magnetizing effect 
  • BDemagnetizing effect
  • CBoth of the demagnetizing and cross magnetizing effects
  • DArmature reaction mmf under the pole faces and avoid flash over between positive and negative brushes 
Correct Answer : (D)

Armature reaction mmf under the pole faces and avoid flash over between positive and negative brushes 

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