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

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Hydraulics and Fluid Mechanics in ME
The specific speed of turbine is defined as the speed of a unit

Of such a size that it delivers unit discharge at unit power
Of such a size that it produces unit horse power with unit head
Of such a size that it delivers unit discharge at unit head
Of such a size that it requires unit power per unit head

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