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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)

Cv × Cr
Cc × Cr
Cc × Cv
Cc/Cr

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

shows erratic behaviour
decreases
increases
remains same

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Hydraulics and Fluid Mechanics in ME
Two pipe systems can be said to be equivalent, when the following quantites are same

friction factor and diameter
flow and length
friction loss and flow
length and diameter

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Hydraulics and Fluid Mechanics in ME
The variation in the volume of a liquid with the variation of pressure is called its

Viscosity
Surface tension
Compressibility
Capillarity

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

V1² / (V1² - V2²)
(V­1² - V2²) / V1²
(V­1 - V2) / V1
V1 / (V1 - V2)

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Hydraulics and Fluid Mechanics in ME
The coefficient of discharge for an external mouthpiece is

0.707
0.5
0.375
0.855

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