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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Delivery head of a centrifugal pump is

Inversely proportional to N²
Directly proportional to N²
Directly proportional to N
Inversely proportional to N

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Hydraulics and Fluid Mechanics in ME
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is

ω.r/4g
ω².r²/2g
ω².r²/4g
ω.r/2g

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Hydraulics and Fluid Mechanics in ME
The velocity corresponding to Reynold number of 2000 is called

Super-sonic velocity
Higher critical velocity
Sub-sonic velocity
Lower critical velocity

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Hydraulics and Fluid Mechanics in ME
The normal stress in a fluid will be constant in all directions at a point only if

It is at rest
It is incompressible
It has uniform viscosity
It has zero viscosity

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Hydraulics and Fluid Mechanics in ME
Centre of buoyancy always

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

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Hydraulics and Fluid Mechanics in ME
The losses are more in

laminar flow
transition flow
turbulent flow
critical flow

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