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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For very great pressures, viscosity of moss gases and liquids

increases
shows erratic behaviour
remains same
decreases

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Hydraulics and Fluid Mechanics in ME
The dynamic viscosity of gases __________ with rise in temperature.

Increases
None of these
Remain unaffected
Decreases

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Hydraulics and Fluid Mechanics in ME
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is

0.417 H5/2
7.141 H5/2
4.171 H5/2
1.417 H5/2

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Hydraulics and Fluid Mechanics in ME
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is

equal
slightly less
slightly more
nearly half

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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
The velocity corresponding to Reynold number of 2000 is called

Sub-sonic velocity
Super-sonic velocity
Higher critical velocity
Lower critical velocity

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