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A thresher delivers a clean sample but a check behind the machine shows a great deal of sound grain in the chaff.

Which adjustment addresses the problem?

  • A.Close the concave clearance
  • B.Reduce the cleaning fan speed
  • C.Increase the cleaning fan speed
  • D.Increase cylinder speed

Answer: B

A clean sample together with grain in the chaff is the signature of an over-strong blast. Slowing the fan keeps the grain in the machine, at the cost of a slightly dirtier sample that the sieve setting can then address.

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