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Sparking that appears only when the load changes rapidly points to

  • A.brushes worn beyond their minimum length
  • B.a commutator surface that has become too smooth
  • C.insulation resistance below its acceptable value
  • D.a commutating flux that does not track the load properly

Answer: D

Interpoles in series with the armature track the load almost instantly, but a compensating winding that is absent or wrongly proportioned leaves the flux distorted during a surge. A machine with rapid load changes therefore needs pole-face compensation.

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