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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

Weir
Mouthpiece
Nozzle
Notch

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Hydraulics and Fluid Mechanics in ME
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

h/w
w/h
wh
h

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Hydraulics and Fluid Mechanics in ME
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

wA
wA/x
wx
wAx

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Hydraulics and Fluid Mechanics in ME
The overall efficiency for a Pelton wheel lies between

0.65 to 0.75
0.85 to 0.90
0.75 to 0.85
0.50 to 0.65

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Hydraulics and Fluid Mechanics in ME
For starting an axial flow pump, its delivery valve should be

Closed
Could be either open or closed
Depends on starting condition and flow desired
Open

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Hydraulics and Fluid Mechanics in ME
The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

(q⁴/g)1/5
(q²/g)1/3
(q/g)1/2
(q³/g)1/4

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