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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The ratio of the inertia force to the viscous force is called

Weber's number
Reynold's number
Froude's number
Euler's number

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Hydraulics and Fluid Mechanics in ME
The hydraulic mean depth for a circular pipe of diameter (d) is

d/4
d/2
d
d/6

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

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Hydraulics and Fluid Mechanics in ME
Practical fluids

are viscous
are compressible
possess surface tension
possess all the above properties

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is

0.46
0.26
0.36
0.56

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

Centrifugal pump
Mixed flow pump
Axial flow pump
None of these

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