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A gravity settling chamber removes particles by

  • A.Slowing the gas so particles settle out
  • B.Spinning the gas to throw particles outward
  • C.Passing the gas through a fabric
  • D.Charging the particles electrically

Answer: A

Reducing the velocity gives the particles time to fall the height of the chamber before the gas leaves it. Only particles above about fifty micrometres settle fast enough to be caught, which confines the device to a pre-cleaning duty ahead of something more capable.

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