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The four principal actions by which a thresher detaches grain are

  • A.Impact, rubbing, stripping and centrifugal throw
  • B.Cutting, grinding, sieving and blowing
  • C.Compression, shear, torsion and bending
  • D.Drying, cooling, sorting and packing

Answer: A

Every threshing cylinder uses some combination of these four, and the proportions depend on the cylinder type and the crop. A spike-tooth cylinder relies mostly on impact while a rasp-bar works largely by rubbing the material against the concave.

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