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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Which of the following is dimensionless?

Specific gravity
Specific speed
Specific weight
Specific volume

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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/x
wAx
wA
wx

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Hydraulics and Fluid Mechanics in ME
In a static fluid

Fluid pressure is zero
Linear deformation is small
Resistance to shear stress is small
Only normal stresses can exist

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Hydraulics and Fluid Mechanics in ME
An air vessel is provided at the summit in a siphon to

Increase velocity
Avoid interruption in the flow
Maintain pressure difference
Increase discharge

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Hydraulics and Fluid Mechanics in ME
With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will

Remain unchanged
Increase
Depend upon the characteristics of liquid
Decrease

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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

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

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