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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

0.46
0.87
0.78
0.64

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Hydraulics and Fluid Mechanics in ME
In a static fluid

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

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Hydraulics and Fluid Mechanics in ME
Medium specific speed of a pump implies it is

Any one of the above
Centrifugal pump
Mixed flow pump
Axial flow pump

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Hydraulics and Fluid Mechanics in ME
Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

(w Hm) / (Q × ηo)
(w Hm Q) / ηo
(w Q) / (Hm × ηo)
(w Q ηo) / Hm

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

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Hydraulics and Fluid Mechanics in ME
Gauge pressure at a point is equal to the absolute pressure ___ the atmospheric pressure.

Minus
Multiply
Divide
Plus

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