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A centrifugal pump driven at variable speed saves energy because its power follows

  • A.the speed itself, in direct proportion throughout the range
  • B.the square of the speed of rotation of the impeller
  • C.no relation to the speed of rotation whatever
  • D.the cube of the speed

Answer: D

Reducing the speed by a fifth takes nearly half off the power, which is why variable-speed pumping pays for itself so quickly on any duty that spends time below full flow. A positive displacement pump offers no such saving.

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