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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The resultant upward pressure of the fluid on an immersed body is called

center of pressure
buoyancy
upthrust
all the above are correct

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Hydraulics and Fluid Mechanics in ME
Center of buoyancy is the

centroid of the displaced volume of fluid
does not exist
center of pressure of displaced volume
e.g. of floating body

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Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - nH)H2
1.84(L - nH)H3
1.84(L - 0.1nH)H3/2
1.84(L - 0.1nH)H5/2

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Hydraulics and Fluid Mechanics in ME
The velocity distribution for laminar flow through a circular tube

is constant over the cross-section
varies linearly from zero at walls to maximum at centre
varies parabolically with maximum at the centre
None of these

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Hydraulics and Fluid Mechanics in ME
In a centrifugal pump casing, the flow of water leaving the impeller, is

Radial flow
Rectilinear flow
Forced vortex
Free vortex motion

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR²/60t
μπ²NR⁴/60t
μπ²NR/60t
μπ²NR³/60t

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