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Speed control of a drive means

  • A.holding the load at exactly its rated speed at all times
  • B.limiting the current the machine draws during starting
  • C.reducing the losses of the machine at its rated operating point
  • D.operating the load at whatever speed the process requires

Answer: D

The point of a variable-speed drive is that the process, not the supply frequency, decides how fast the machine turns. Once that freedom exists, the speed can be used to control flow, tension, production rate or position as the application requires.

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