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Hydraulics and Fluid Mechanics in ME

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

between 2000 and 4000
less than 2000
more than 4000
less than 4000

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Hydraulics and Fluid Mechanics in ME
The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)

8μvl/wd²
32μvl/wd²
4μvl/wd²
16μvl/wd²

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

Axial flow pump
Mixed flow pump
None of these
Centrifugal pump

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Hydraulics and Fluid Mechanics in ME
Centrifugal pump is started with its delivery valve

Kept 50% open
Irrespective of any position
Kept fully open
Kept fully closed

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Hydraulics and Fluid Mechanics in ME
The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as

one dimensional flow
turbulent flow
steady flow
uniform flow

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Hydraulics and Fluid Mechanics in ME
The pressure of fluid due to hammer blow is

Directly proportional to (density)1/2 of fluid
Inversely proportional to (density)1/2 of fluid
Inversely proportional to density of fluid
Directly proportional to density of fluid

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