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A drive specified with far more accuracy than the load requires

  • A.will fail to hold the speed the load actually needs
  • B.improves the efficiency of the installation as a whole
  • C.reduces the maintenance the installation requires
  • D.costs more than necessary without any benefit

Answer: D

Feedback devices, cabling and the commissioning effort all cost money, and an unnecessary encoder is also one more thing to fail. Specifying to the requirement rather than to the state of the art is part of the engineering.

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