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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The specific weight of water in S.I. units is taken as

9.81 kN/m3
Any one of these
9.81 × 103 N/m3
9.81 × 10-6 N/mm3

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Hydraulics and Fluid Mechanics in ME
The equation of continuity holds good when the flow

All of these
velocity is uniform at all the cross sec-tions
is steady
is one dimensional

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Hydraulics and Fluid Mechanics in ME
The fluid forces considered in the Navier Stokes equation are

gravity, pressure and viscous
gravity, pressure and turbulent
gravity, viscous and turbulent
pressure, viscous and turbulent

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

2r
r/2
r

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

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Hydraulics and Fluid Mechanics in ME
The increase of temperature results in

decrease in viscosity of gas
decrease in viscosity of liquid
increase in viscosity of gas
increase in viscosity of liquid

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