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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The eddy viscosity for turbulent flow is

independent of the flow
dependent on the flow
a function of temperature only
a physical property of the fluid.

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Hydraulics and Fluid Mechanics in ME
Centre of buoyancy always

coincides with the centroid of the volume of fluid displaced
coincides with the centre of gravity
remains above the centre of gravity
remains below the centre of gravity

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Efficiency will be low
Excessive power will be consumed
No flow will take place
Cavitation will be formed

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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
Kaplan turbine
None of these
Pelton wheel

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Hydraulics and Fluid Mechanics in ME
The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.

Less than
More than
Equal to
None of these

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Hydraulics and Fluid Mechanics in ME
A pressure of 25 m of head of water is equal to

2500 kN/m2
245 kN/m2
2.5 kN/m2
25 kN/m2

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