Hydraulics and Fluid Mechanics in ME
If the surface of liquid is convex, men

Cohesion pressure is decreased
Cohesion pressure is increased
There is no cohesion pressure
Cohesion pressure is negligible

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Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

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

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Hydraulics and Fluid Mechanics in ME
The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface)

(IG/Ax̅) + x̅
(IG/x̅) - Ax̅
(IG/Ax̅) - x̅
(Ax̅/IG) + x̅

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Hydraulics and Fluid Mechanics in ME
The hydraulic efficiency of an impulse turbine is the

Ratio of the actual work available at the turbine to the energy imparted to the wheel
None of these
Ratio of the work done on the wheel to the energy of the jet
Ratio of the actual power produced by the turbine to the energy actually supplied by the turbine

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