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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Falling drops of water become spheres due to the property of

viscosity
adhesion
surface tension
cohesion

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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)

0.20 cm
0.05 cm
0.40 cm
0.10 cm

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Hydraulics and Fluid Mechanics in ME
Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?

Francis turbine
Pelton wheel
None of these
Kaplan turbine

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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)

16μvl/wd²
8μvl/wd²
4μvl/wd²
32μvl/wd²

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Hydraulics and Fluid Mechanics in ME
Maximum impulse will be developed in hydraulic ram when

Ram chamber is large
Supply pipe is long
Supply pipe is short
Waste valve closes suddenly

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Hydraulics and Fluid Mechanics in ME
An open tank containing liquid is moving with an acceleration on an inclined plane. The inclination of the free surface of the liquid will be __________ to the acceleration of the tank.

Equal to
Inversely proportional
Directly proportional
None of these

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