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HYDRAULICS AND FLUID MECHANICS IN ME

Hydraulics and Fluid Mechanics in ME
A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

0.78
0.46
0.87
0.64

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

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Hydraulics and Fluid Mechanics in ME
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

1/3 to 1/2
1/16 to 1/8
1/8 to 1/4
1/4 to 1/3

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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
Stream line
Steak line
Potential line

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Hydraulics and Fluid Mechanics in ME
The pressure measured with the help of a Piezometer tube is in

Head of liquid
All of these
N/mm2
N/m2

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