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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are

equal
more
less at low temperature and more at high temperature
less

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Hydraulics and Fluid Mechanics in ME
Pressure intensifier increases the pressure in proportion to

Ratio of diameters
Square of inverse ratio of diameters
Inverse ratio of diameters
Square of ratio of diameters

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Hydraulics and Fluid Mechanics in ME
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

Q = π.D.Vf
Q = π.D.bf.V
Q = D.b.Vf
Q = π.b.Vf

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Hydraulics and Fluid Mechanics in ME
Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by

0.1
0.2
0.05
0.15

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Hydraulics and Fluid Mechanics in ME
Barometer is used to measure

Very low pressure
Pressure in pipes, channels etc.
Difference of pressure between two points
Atmospheric pressure

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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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