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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

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

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Hydraulics and Fluid Mechanics in ME
The flow in which conditions do not change with time at any point, is known as

uniform flow
one dimensional flow
turbulent flow
steady flow

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Hydraulics and Fluid Mechanics in ME
The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is (Assume that boundary layer is entirely laminar)

0.10 cm
0.20 cm
0.40 cm
0.05 cm

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Hydraulics and Fluid Mechanics in ME
If the depth of water in an open channel is less than the critical depth, the flow is called

Critical flow
Turbulent flow
Torrential flow
Tranquil flow

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Hydraulics and Fluid Mechanics in ME
The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

Steak line
Potential line
Stream line
Path line

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Hydraulics and Fluid Mechanics in ME
The optimum value of vane exit angle for a centrifugal pump impeller is

30-40°
20-25°
10-15°
50-60°

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