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A closed-loop speed drive differs from an open-loop one in that it

  • A.requires no converter between the supply and the machine
  • B.can only be used with a dc machine rather than an ac one
  • C.operates at constant torque throughout its whole range
  • D.measures the speed and corrects the error

Answer: D

Comparing the measured speed with the reference and acting on the difference removes the droop and rejects load disturbances. The cost is the feedback device, its cabling and the risk of failure that the extra component brings.

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