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Plugging of an induction motor is achieved by

  • A.opening the rotor circuit of a wound rotor machine
  • B.interchanging two of the supply connections
  • C.injecting direct current into the stator windings of the machine
  • D.raising the supply frequency well above its rated value

Answer: B

Reversing the phase sequence sends the field the other way, so the slip becomes nearly two and a heavy braking torque appears. Both the supply energy and the stored kinetic energy are dissipated in the machine, so it heats severely.

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