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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The specific speed (Ns) of a centrifugal pump is given by

(N√Q)/H
(N√Q)/H5/4
(N√Q)/H3/4
(N√Q)/H2/3

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Hydraulics and Fluid Mechanics in ME
Poise is the unit of

surface tension
viscosity
shear stress in fluids
capillarity

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Hydraulics and Fluid Mechanics in ME
A pressure of 25 m of head of water is equal to

2500 kN/m2
245 kN/m2
2.5 kN/m2
25 kN/m2

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Hydraulics and Fluid Mechanics in ME
The pressure measured with the help of a Piezometer tube is in

Head of liquid
All of these
N/m2
N/mm2

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Hydraulics and Fluid Mechanics in ME
The continuity equation is connected with

Conservation of mass
Open channel/pipe flow
Steady/unsteady flow
Compressibility of fluids

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Hydraulics and Fluid Mechanics in ME
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be

Same
H.P./0.75
0.75 B.H.P
1.5 B.H.P

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