Hydraulics and Fluid Mechanics in ME
The hydraulic grade line is

All of these
always sloping downward in the direction of flow
never above the energy grade line
always above the centre line of pipe

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Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

flow is increased
the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
pressure becomes more than critical pressure
pressure is increased

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