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Cleaning efficiency of a thresher expresses

  • A.The proportion of grain detached from the head
  • B.The proportion of straw removed
  • C.The fan power per tonne
  • D.The proportion of clean grain in the main grain outlet

Answer: D

It looks at the quality of the delivered stream rather than at whether the grain came free of the head. A machine with excellent threshing efficiency may still deliver a thoroughly dirty sample if its shoe is misadjusted.

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