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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

Path line
Potential line
Steak line
Stream line

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Hydraulics and Fluid Mechanics in ME
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)

Q = π.D.bf.V
Q = π.D.Vf
Q = D.b.Vf
Q = π.b.Vf

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Hydraulics and Fluid Mechanics in ME
The magnitude of water hammer depends upon the

Elastic properties of the pipe material
All of these
Speed at which the valve is closed
Elastic properties of the liquid flowing through the pipe

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Hydraulics and Fluid Mechanics in ME
Newton's law of viscosity is a relationship between

Shear stress and rate of shear strain
Pressure, velocity and temperature
Shear stress and velocity
Rate of shear strain and temperature

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Hydraulics and Fluid Mechanics in ME
The hydraulic grade line is

always sloping downward in the direction of flow
All of these
never above the energy grade line
always above the centre line of pipe

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Hydraulics and Fluid Mechanics in ME
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then

Cavitation will be formed
No flow will take place
Excessive power will be consumed
Efficiency will be low

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