In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?
(A) Relative roughness
(B) Absolute roughness
(C) Friction co-efficient for flows at equal Reynold number
(D) All
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