Hydraulics and Fluid Mechanics in ME
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

Pascal’s law
Archimedes’s principle
Continuity equation
Bernoulli’s equation

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Hydraulics and Fluid Mechanics in ME
Coefficient of contraction is the ratio of

Loss of head in the orifice to the head of water available at the exit of the orifice
Loss of head in the orifice to the head of water available at the exit of the orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice

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Hydraulics and Fluid Mechanics in ME
When a liquid is flowing through a pipe, the velocity of the liquid is

Maximum at the centre and minimum near the walls
Maximum at the centre and zero near the walls
Zero at the centre and maximum near the walls
Minimum at the centre and maximum near the walls

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