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

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

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Hydraulics and Fluid Mechanics in ME
The function of guide vanes in a reaction turbine is to

Allow the water to flow over them, without forming eddies
Allow the water to enter the runner without shock
All of the listed here
Allow the required quantity of water to enter the turbine

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