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An open-loop drive holds its speed

  • A.only while the load remains at exactly its rated value
  • B.only as well as its characteristic allows
  • C.to within a hundredth of a per cent of the commanded value
  • D.exactly, whatever the load applied to it

Answer: B

With no feedback, the speed droops as the load is applied by whatever the machine's characteristic dictates, typically a few per cent for an induction machine. That is perfectly adequate for a fan or a pump and quite inadequate for a machine tool.

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