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A load requiring a very wide speed range with high accuracy at the bottom of it needs

  • A.closed-loop control with a good position feedback device
  • B.open-loop V/f control with slip compensation
  • C.a fluid coupling between the machine and the load
  • D.stator voltage control of an induction machine

Answer: A

Only feedback of adequate resolution can hold a speed accurately at a hundredth of rated, and only a full-flux method can produce the torque there. The feedback device rather than the machine is usually the limiting component.

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