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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to

10000
2100
21000
2700

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Hydraulics and Fluid Mechanics in ME
The sheet of water flowing over a notch or a weir is known as

Sill or crest
Nappe or vein
Orifice
None of these

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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
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

wA
wAx
wA/x
wx

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant pressure, the speed capacity and power vary

Directly as the air or gas density
As square of density
Inversely as square root of density
Inversely as density

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Excessive power will be consumed
Cavitation will be formed
No flow will take place
Efficiency will be low

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