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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Bernoulli's equation is applied to

Orifice meter
Venturimeter
Pitot tube
All of the listed here

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Hydraulics and Fluid Mechanics in ME
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

Equal to
Less than
None of these
More than

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Cavitation will be formed
Excessive power will be consumed
Efficiency will be low
No flow will take place

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Hydraulics and Fluid Mechanics in ME
Fluid is a substance which offers no resistance to change of

Pressure
Volume
Flow
Shape

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Hydraulics and Fluid Mechanics in ME
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

d = (D⁵/8fl)1/2
d = (D⁵/8fl)1/4
d = (D⁵/8fl)1/5
d = (D⁵/8fl)1/3

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Hydraulics and Fluid Mechanics in ME
Units of surface tension are

distance
energy/unit area
it has no units
both of the above

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