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The single most effective change to stop an arch forming over a silo outlet is

  • A.raising the height of the silo
  • B.filling the silo more slowly
  • C.using a coarser grade of the same material
  • D.enlarging the outlet

Answer: D

An arch is stable only up to a critical span set by the strength of the consolidated material, so an outlet wider than that span cannot support one. Vibrators and air cannons treat the symptom of an outlet that is too small.

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