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Dynamic braking of an induction motor is commonly arranged by

  • A.injecting direct current into the stator windings
  • B.reversing two of the three supply connections to the stator
  • C.driving the machine above its synchronous speed with the load
  • D.inserting resistance in the stator circuit of the machine

Answer: A

A stationary field produced by dc in the stator makes the rotating rotor generate into its own resistance, and the kinetic energy becomes heat in the rotor. It works whatever the supply is doing, which suits an emergency stop.

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