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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to

Half the depth
Twice the breadth
Half the breadth
Twice the depth

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Hydraulics and Fluid Mechanics in ME
The value of mass density in kgsecVm4 for water at 0°C is

100
1
101.9
1000

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Hydraulics and Fluid Mechanics in ME
In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)

p/sinα
p/2sinα
2p/sin (α/2)
2p/sinα

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Hydraulics and Fluid Mechanics in ME
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

π w ω² r³/4g
π w ω² r²/4g
π w ω² r²/2g
π w ω² r⁴/4g

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Hydraulics and Fluid Mechanics in ME
The unit speed of the turbine runner is

N/H
N/√H
N/H²
N/H3/2

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Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

All of these
It has minimum wetted perimeter
It involves lesser excavation for the designed amount of discharge
It gives maximum discharge for a given cross-sectional area and bed slope

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