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A pneumatic conveyor moves material by

  • A.Pushing it with a helical flight
  • B.Carrying it in buckets
  • C.Vibrating it along a trough
  • D.Entraining it in a moving air stream

Answer: D

Air velocity must exceed the material's saltation velocity, and routing is easy since the pipe can turn in any direction. The costs are high power per tonne, appreciable product attrition and the need for a cyclone or filter at the discharge.

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