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A drive on a positive displacement pump presents

  • A.a torque proportional to the square of the speed
  • B.a torque inversely proportional to the speed
  • C.no torque at all below its rated speed
  • D.a nearly constant torque at all speeds

Answer: D

Each revolution displaces a fixed volume against the discharge pressure, so the torque follows the pressure and not the speed. Such a pump has no cubic law to exploit, and the energy saving from variable speed is proportional rather than dramatic.

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