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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Water is a __________ fluid.

Ideal
Real
Non-Newtonian
Newtonian

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Hydraulics and Fluid Mechanics in ME
The loss of head at exit of a pipe is (where v = Velocity of liquid in the pipe)

v²/2g
0.75v²/2g
0.5v²/2g
0.375v²/2g

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Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Reynolds number is

Less than 2000
More than 4000
Less than 4000
Between 2000 and 4000

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

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Hydraulics and Fluid Mechanics in ME
A flow is called sub-sonic, if the Mach number is

More than 6
Between 1 and 6
Unity
Less than unity

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Hydraulics and Fluid Mechanics in ME
With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on

a circular disc of plate held normal to flow
a sphere
a streamlined body
a cylinder

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