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The cut diameter of a cyclone is the particle size at which

  • A.Collection efficiency is one hundred per cent
  • B.Pressure drop is at its maximum
  • C.The gas velocity equals the settling velocity
  • D.Collection efficiency is fifty per cent

Answer: D

It is the single figure by which cyclones are compared, and efficiency rises steeply above it and falls away below. A high efficiency cyclone achieves a smaller cut diameter by using a narrower body, and pays for it in pressure drop.

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