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Adding feedback to a drive improves

  • A.the power factor at which the drive draws current
  • B.the accuracy with which it holds its commanded speed
  • C.the maximum torque the machine is able to develop
  • D.the efficiency of the machine at its rated operating point

Answer: B

The controller acts on the difference between measured and commanded speed, so the droop disappears and load disturbances are rejected. What the machine can physically deliver is unchanged, and so is everything on the supply side.

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