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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

(bd²/12) + x̅
(d²/12 x̅) + x̅
b²/12 + x̅
d²/12 + x̅

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Hydraulics and Fluid Mechanics in ME
The highest efficiency is obtained with a channel of __________ section.

Trapezoidal
Square
Rectangular
Circular

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Hydraulics and Fluid Mechanics in ME
Metacentric height for small values of angle of heel is the distance between the

centre of gravity and metacentre
centre of buoyancy and metacentre
free surface and centre of buoyancy
centre of gravity and centre of buoy-ancy

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Hydraulics and Fluid Mechanics in ME
For hypersonic flow, the Mach number is

greater than 2
greater than 4
unity
greater than unity

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Hydraulics and Fluid Mechanics in ME
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

π w ω² r³/4g
π w ω² r²/2g
π w ω² r⁴/4g
π w ω² r²/4g

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Hydraulics and Fluid Mechanics in ME
The dynamic viscosity of the liquid __________ with rise in temperature.

None of these
Decreases
Increases
Remain unaffected

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