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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.

Less than
More than
Equal to
None of these

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the pressure varies

Square root of fan speed
Directly as fan speed
Cube of fan speed
Square of fan speed

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Hydraulics and Fluid Mechanics in ME
Falling drops of water become spheres due to the property of

cohesion
surface tension
viscosity
adhesion

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

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Hydraulics and Fluid Mechanics in ME
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)

0.577 R
0.223 R
0.423 R
0.707 R

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Hydraulics and Fluid Mechanics in ME
A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

7
6
5
1

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