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Reversing the direction of a dc motor is achieved by reversing

  • A.the supply frequency applied to the armature of the machine
  • B.either the armature or the field connections, but not both
  • C.both the armature and the field connections at the same time
  • D.neither, the direction being fixed by the construction of the machine

Answer: B

Torque follows the product of flux and current, so reversing either factor reverses the torque while reversing both leaves it unchanged. Armature reversal is faster and is what a dual converter provides electronically.

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