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A compressor driven at variable speed rather than by load-unload cycling

  • A.requires no receiver or storage vessel at all
  • B.runs at a constant speed with the inlet throttled
  • C.matches its output to the demand continuously
  • D.delivers a fixed output whatever the demand may be

Answer: C

Cycling wastes energy in unloaded running and in the pressure band it needs, whereas a variable-speed machine sits at whatever speed the demand requires. On a plant with a widely varying air demand the saving is substantial.

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