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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.

H/2
2H/3
H/3
3H/4

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Hydraulics and Fluid Mechanics in ME
An ideal flow of any fluid must fulfill the following

Newton’s law of motion
Pascal’ law
Newton’s law of viscosity
Continuity equation

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

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

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Hydraulics and Fluid Mechanics in ME
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

(2/3) × Cd (L - nH) × √(2gh)
(2/3) × Cd (L - nH) × √(2g) × H5/2
(2/3) × Cd (L - 0.1nH) × √(2g) × H3/2
(2/3) × Cd (L - nH) × √(2g) × H²

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Hydraulics and Fluid Mechanics in ME
A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

7.5 kN/m3
4.5 kN/m3
6 kN/m3
10 kN/m3

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Hydraulics and Fluid Mechanics in ME
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

Lower than the surface of liquid
Unpredictable
The same as the surface of liquid
Higher than the surface of liquid

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