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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

Equal to
One-third
One-half
One-fourth

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Hydraulics and Fluid Mechanics in ME
In an isothermal atmosphere, the pressure

varies in the same way as the density
decreases linearly with elevation
remains constant
increases exponentially with elevation

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Hydraulics and Fluid Mechanics in ME
The specific weight of water in S.I. units is taken as

9.81 kN/m3
Any one of these
9.81 × 103 N/m3
9.81 × 10-6 N/mm3

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Hydraulics and Fluid Mechanics in ME
According to equation of continuity,

a1/v1 = a2/v2
a1v1 = a2v2
w1a1 = w2a2
w1v1 = w2v2

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Hydraulics and Fluid Mechanics in ME
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.

Increases
Decreases
Remain same
None of these

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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 × Cv
Cc/Cr
Cc × Cr

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