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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The tendency of a liquid surface to contract is due to the following property

adhesion
cohesion
surface tension
viscosity

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Hydraulics and Fluid Mechanics in ME
If V1 and V2 are the velocities of water at inlet and outlet of the draft tube respectively, then the efficiency of a draft tube is

(V­1 - V2) / V1
V1² / (V1² - V2²)
(V­1² - V2²) / V1²
V1 / (V1 - V2)

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Hydraulics and Fluid Mechanics in ME
A model of a reservior is drained in 4 mts by opening the sluice gate. The model scale is 1: 225. How long should it take to empty the prototype ?

4 (225)1/3 minutes
4 x (225)3/2 minutes
4 minutes
4 x V225 minutes

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Hydraulics and Fluid Mechanics in ME
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

(2/3) × Cd (L - nH) × √(2gh)
(2/3) × Cd (L - nH) × √(2g) × H5/2
(2/3) × Cd (L - 0.1nH) × √(2g) × H3/2
(2/3) × Cd (L - nH) × √(2g) × H²

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Hydraulics and Fluid Mechanics in ME
The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

0.4
0.6
0.8
0.5

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Hydraulics and Fluid Mechanics in ME
According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary

Inversely as density
Directly as the air or gas density
As square of density
Inversely as square root of density

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