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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
To avoid an interruption in the flow of a siphon, an air vessel is provided

At the outlet
At any point between inlet and outlet
At the summit
At the inlet

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Hydraulics and Fluid Mechanics in ME
Alcohol is used in manometers because

It can provide longer column due to low density
It has low surface tension
It has low vapour pressure
It is clearly visible

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Hydraulics and Fluid Mechanics in ME
Euler's equation in the differential form for the motion of liquids is given by

dp/ρ + g.dz + v.dv = 0
ρ.dp - g.dz + v.dv = 0
ρ.dp + g.dz + v.dv = 0
dp/ρ - g.dz + v.dv = 0

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Hydraulics and Fluid Mechanics in ME
The tendency of a liquid surface to contract is due to the following property

viscosity
adhesion
cohesion
surface tension

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Hydraulics and Fluid Mechanics in ME
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

flv²/2gd
3flv²/2gd
4flv²/2gd
flv²/gd

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Hydraulics and Fluid Mechanics in ME
The flow ratio in case of Francis turbine varies from

0.6 to 0.9
0.15 to 0.3
0.4 to 0.5
1 to 1.5

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