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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The most efficient section of a channel is

Rectangular
Trapezoidal
Triangular
Square

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

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Hydraulics and Fluid Mechanics in ME
An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called

Orifice
Notch
Weir
None of these

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Hydraulics and Fluid Mechanics in ME
The force per unit length is the unit of

Viscosity
Capillarity
Compressibility
Surface tension

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Hydraulics and Fluid Mechanics in ME
For manometer, a better liquid combination is one having

surface tension is no criterion
high density and viscosity
higher surface tension
lower surface tension

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Hydraulics and Fluid Mechanics in ME
The center of gravity of the volume of the liquid displaced by an immersed body is called

center of gravity
center of pressure
metacentre
center of buoyancy

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