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Mr. Dubey • 100.64K Points
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Q. Commercial cast-iron and steel pipes carrying fluids under pressure are regarded as hydraulically smooth when

  • (A) The laminar layer is thin as compared to the average height of roughness elements
  • (B) The height of the roughness projections is low
  • (C) The roughness elements are all completely covered by the laminar sublayer
  • (D) None of the above.
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