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Which of these is LEAST likely to be a reason for adding a colour sorter?

  • A.Meeting a strict appearance specification
  • B.Removing stones of the same size as the grain
  • C.Removing discoloured kernels
  • D.Removing mouldy grain

Answer: B

Correct answer: Removing stones of the same size as the grain

A colour sorter examines each particle optically and rejects it with an air jet, so it is the machine for anything that differs in appearance - discoloured, mouldy or insect-damaged kernels - and for meeting a strict appearance specification. Stones are a density problem with a well-established mechanical solution, and a destoner does the job far more cheaply.

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