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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Practical fluids

are viscous
possess surface tension
are compressible
possess all the above properties

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Hydraulics and Fluid Mechanics in ME
According to equation of continuity,

a1/v1 = a2/v2
w1v1 = w2v2
w1a1 = w2a2
a1v1 = a2v2

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Hydraulics and Fluid Mechanics in ME
A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

Archimedes’s principle
D-Alembert’s principle
None of these
Pascal’s law

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Hydraulics and Fluid Mechanics in ME
The coefficient of discharge for an external mouthpiece depends upon

Velocity of liquid
Area of mouthpiece
Length of mouthpiece
Pressure of liquid

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Hydraulics and Fluid Mechanics in ME
The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)

L.A.N
(2 L.A.N)/60
(L.A.N)/60
2 L.A.N

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Hydraulics and Fluid Mechanics in ME
In an immersed body, centre of pressure is

At the centre of gravity
Below be centre of gravity
Above the centre of gravity
Could be above or below e.g. depending on density of body and liquid

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