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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)

wh
h/w
w
w/h

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Hydraulics and Fluid Mechanics in ME
The major loss of energy in long pipes is due to

sudden contraction
sudden enlargement
friction
gradual contraction or enlargement

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Hydraulics and Fluid Mechanics in ME
Mercury does not wet glass. This is due to property of liquid known as

cohesion
viscosity
surface tension
adhesion

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Hydraulics and Fluid Mechanics in ME
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

4σ cosα/wd
4wd/σ cosα
wd/4σ cosα
σ cosα/4wd

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Hydraulics and Fluid Mechanics in ME
The tendency of a liquid surface to contract is due to the following property

cohesion
viscosity
adhesion
surface tension

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Hydraulics and Fluid Mechanics in ME
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

40 × 10⁵ kg/cm²
4000 kg/cm²
400 kg/cm²
40 × 10⁶ kg/cm²

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