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A specific gravity separator, or gravity table, separates material by

  • A.Terminal velocity alone
  • B.Colour
  • C.Density, on a fluidised oscillating deck
  • D.Length, using indents

Answer: C

Air blown up through a porous deck fluidises the bed so that heavy particles sink and contact the deck while light ones float, and the oscillation then walks the two fractions apart. It is the standard way to remove insect-damaged and immature grain.

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