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A dc drive whose speed feedback fails will typically

  • A.stop immediately and safely
  • B.continue to hold its speed exactly as before the failure occurred
  • C.reverse its direction of rotation without any change of reference
  • D.run away or behave erratically

Answer: D

With the measured speed reading low or zero, the controller commands ever more current in an attempt to correct an error that is not there. Feedback failure detection is therefore part of the protection of any closed-loop drive.

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