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. Friction co-efficient for flows at equal Reynold number

B. All A., B. & C.

C. Absolute roughness

D. Relative roughness

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