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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

Submerged weir
Ogee weir
Narrow-crested weir
Broad-crested weir

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Hydraulics and Fluid Mechanics in ME
The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

w × Q × hf
w × Q (H - hf)
w × Q (H + hf)
w × Q × H

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Hydraulics and Fluid Mechanics in ME
The ratio of the inertia force to the elastic force is called

Mach number
Froude's number
Weber's number
Reynold's number

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Hydraulics and Fluid Mechanics in ME
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

d = (D⁵/8fl)1/5
d = (D⁵/8fl)1/3
d = (D⁵/8fl)1/4
d = (D⁵/8fl)1/2

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Hydraulics and Fluid Mechanics in ME
The center of pressure of a surface subjected to fluid pressure is the point

at which all hydraulic forces meet
on the surface at which gravitational force acis
similar to metacentre
on the surface at which resultant pres-sure acts

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Hydraulics and Fluid Mechanics in ME
The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

0.95 times
0.34 times
0.81 times
0.67 times

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