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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Rain drops are spherical because of

viscosity
air resistance
atmospheric pressure
surface tension forces

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Hydraulics and Fluid Mechanics in ME
In an isothermal atmosphere, the pressure

remains constant
decreases linearly with elevation
increases exponentially with elevation
varies in the same way as the density

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Hydraulics and Fluid Mechanics in ME
The impeller of a centrifugal pump may have

Vortex casing
Any one of these
Volute casing
Volute casing with guide blades

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Hydraulics and Fluid Mechanics in ME
When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wave), the portion of pipe length subjected to maximum head is

L/2
L/3
L
L/4

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Hydraulics and Fluid Mechanics in ME
The maximum thickness of boundary layer in a pipe of radius r is

r/2
2r
r

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

Cohesion
Viscosity
Adhesion
Surface tension

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