In turbulent flow, a rough pipe has the same friction factor as a smooth pipe

In turbulent flow, a rough pipe has the same friction factor as a smooth pipe Correct Answer When the roughness projections are much smaller than the thickness of the laminar film

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The friction factor for turbulent flow in a hydraulically smooth pipe
For a smooth conduit, which of the following is the value of friction factor (f) for laminar and turbulent flow respectively?