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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Reynolds number is

Less than 2000
Between 2000 and 4000
More than 4000
Less than 4000

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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

d²/12 + x̅
(d²/12 x̅) + x̅
(bd²/12) + x̅
b²/12 + x̅

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Hydraulics and Fluid Mechanics in ME
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

(q²/g)1/3
(q⁴/g)1/5
(q³/g)1/4
(q/g)1/2

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Hydraulics and Fluid Mechanics in ME
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

a function of Reynolds number and relative roughness
constant
dependent only on Reynolds number
dependent on relative roughness only

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Hydraulics and Fluid Mechanics in ME
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

steady flow
one dimensional flow
uniform f^w
turbulent flow

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Hydraulics and Fluid Mechanics in ME
High specific speed of a pump implies it is

Any one of the above
Axial flow pump
Mixed flow pump
Centrifugal pump

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