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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A turbine develops 10000 kW under a head of 25 meters at 135 r.p.m. Its specific speed is

275.4 r.p.m
215.5 r.p.m.
241.5 r.p.m.
175.4 r.p.m.

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Hydraulics and Fluid Mechanics in ME
Dynamic viscosity of most of the liquids with rise in temperature

Increases
Unpredictable
Remain unaffected
Decreases

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Hydraulics and Fluid Mechanics in ME
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

wA
wx
wA/x
wAx

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Hydraulics and Fluid Mechanics in ME
In an immersed body, centre of pressure is

Above the centre of gravity
Below be centre of gravity
Could be above or below e.g. depending on density of body and liquid
At the centre of gravity

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Hydraulics and Fluid Mechanics in ME
Dynamic similarity is said to exist between the model and the prototype, if both of them

Have identical velocities
Are equal in size and shape
None of these
Are identical in shape, but differ only in size

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Hydraulics and Fluid Mechanics in ME
Which of the following pump is successfully used for lifting water to the boilers?

Jet pump
Airlift pump
Reciprocating pump
Centrifugal pump

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