In the complete turbulence zone (in rough pipes), the

1.	In the complete turbulence zone (in rough pipes), the
A.	rough and smooth pipes have the same friction factor.
B.	laminar film covers the roughness projections.
C.	friction factor depends upon NRe only.
D.	friction factor is independent of the relative roughness.
Answer» E.

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In the complete turbulence zone (in rough pipes), the

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