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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 syphon, an air vessel is provided

at the summit
ay nay point between inlet and outlet
at the outlet
at the inlet

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Hydraulics and Fluid Mechanics in ME
Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump)

(w Hm Q) / ηo
(w Q) / (Hm × ηo)
(w Q ηo) / Hm
(w Hm) / (Q × ηo)

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Hydraulics and Fluid Mechanics in ME
A channel is said to be of most economical cross-section, if

It gives maximum discharge for a given cross-sectional area and bed slope
All of these
It has minimum wetted perimeter
It involves lesser excavation for the designed amount of discharge

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Hydraulics and Fluid Mechanics in ME
Kinematic similarity is said to exist between the model and the prototype, if both of them

Are identical in shape, but differ only in size
Are equal in size and shape
Have identical velocities
Have identical forces

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Hydraulics and Fluid Mechanics in ME
Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of

Lower discharge
High initial and maintenance cost
Necessity of air vessel
Lower speed of operation

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

viscosity
adhesion
cohesion
surface tension

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