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Emf commutation improves commutation by

  • A.increasing the number of parallel paths in the winding
  • B.inducing an emf that opposes the reactance voltage
  • C.raising the contact resistance of the brushes
  • D.reducing the speed at which the machine is driven

Answer: B

Interpoles, or a deliberate shift of the brushes, give the coil an emf that drives the current reversal instead of resisting it. Interpoles are preferred because their correction tracks the load and needs no adjustment when the direction changes.

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