Hydraulics and Fluid Mechanics in ME
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

constant
a function of Reynolds number and relative roughness
dependent only on Reynolds number
dependent on relative roughness only

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Hydraulics and Fluid Mechanics in ME
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

Glass tube is cheaper than a metallic tube
It is not possible to conduct this experiment with any other tube
All of these
It is easier to see through the glass tube

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