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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The highest efficiency is obtained with a channel of __________ section.

Square
Circular
Rectangular
Trapezoidal

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Hydraulics and Fluid Mechanics in ME
In order to avoid cavitation in centrifugal pumps

The suction pressure should be high
The delivery pressure should be high
The suction pressure should be low
The delivery pressure should be low

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Hydraulics and Fluid Mechanics in ME
Dimensions of surface tension are

ML²T²
ML r²
ML°T
ML°T⁻²

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Hydraulics and Fluid Mechanics in ME
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

(8/15) Cd. 2g. H3/2
(8/15) Cd. 2g. H
(8/15) Cd. 2g. H²
(8/15) Cd. 2g. H5/2

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Hydraulics and Fluid Mechanics in ME
The value of friction factor ‘f’ for smooth pipes for Reynolds number 106 is approximately equal to

0.1
0.01
0.001
0.0001

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Hydraulics and Fluid Mechanics in ME
In an immersed body, centre of pressure is

At the centre of gravity
Below be centre of gravity
Above the centre of gravity
Could be above or below e.g. depending on density of body and liquid

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