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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The viscosity of water at 20°C is

One poise
One centistoke
One centipoise
One stoke

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Hydraulics and Fluid Mechanics in ME
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is

equal
slightly more
slightly less
nearly half

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

[(Vr - v) v]/ Vr
[(Vr + v) v]/ Vr
[2(Vr + v) v]/ Vr²
[2(Vr - v) v]/ Vr²

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Hydraulics and Fluid Mechanics in ME
A flow in which __________ force is dominating over the viscosity is called turbulent flow.

Elastic
Viscous
Surface tension
Inertia

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

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Hydraulics and Fluid Mechanics in ME
Head developed by a centrifugal pump depends on

Fluid density
Impeller diameter
Speed
Both (A) and (B) above

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