Fanning friction factor for laminar flow of fluid in a circular pipe i

1.	Fanning friction factor for laminar flow of fluid in a circular pipe is
A.	not a function of the roughness of pipe wall.
B.	inversely proportional to Reynolds number.
C.	both (a) & (b).
D.	neither (a) nor (b).
Answer» D. neither (a) nor (b).

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Fanning friction factor for laminar flow of fluid in a circular pipe is

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