Q
In turbulent flow, a rough pipe has the same friction factor as a smooth pipe____________________?
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A
A. In the zone of complete turbulence
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B
B. When the roughness projections are much smaller than the thickness of the laminar film
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C
C. Everywhere in the transition zone
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D
D. When the friction factor is independent of the reynoldβs number
Correct Answer:
B. B. When the roughness projections are much smaller than the thickness of the laminar film
