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

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

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of a reaction turbine, is the ratio of

Work-done on the wheel to the energy (or head of water) actually supplied to the turbine
Actual work available at the turbine to energy imparted to the wheel
None of these
Power produced by the turbine to the energy actually supplied by the turbine

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