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The angle of repose of a granular material is

  • A.The angle at which grain begins to slide on a steel surface
  • B.The angle of the hopper wall
  • C.The angle between the grain's major and minor axes
  • D.The steepest angle a freely formed heap makes with the horizontal

Answer: D

It describes how a material behaves when tipped into a pile and is the first figure used in designing bins, chutes and conveyors. It rises as moisture content increases, which is why damp lots bridge where dry ones flow.

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