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During plugging, the total energy dissipated in the machine is approximately

  • A.zero
  • B.twice the kinetic energy of the rotating parts
  • C.the kinetic energy of the rotating parts alone
  • D.half the kinetic energy of the rotating parts

Answer: B

The supply continues to deliver energy while the machine also absorbs the stored kinetic energy, and both end up as heat inside the machine. That doubling is why plugging is so hard on the windings and is reserved for occasional use.

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