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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The body will float if the force of buoyancy is ___ the weight of the liquid displaced.

More than
Equal to
None of the listed here
Less than

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Hydraulics and Fluid Mechanics in ME
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

(v₁ - v₂)²/2g
(v₁² - v₂²)/g
(v₁² - v₂²)/2g
(v₁ - v₂)²/g

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Hydraulics and Fluid Mechanics in ME
When the coefficient of discharge (Cd) is 0.623, then the general equation for discharge over a rectangular weir is

1.84(L - 0.1nH)H3/2
1.84(L - nH)H3
1.84(L - 0.1nH)H5/2
1.84(L - nH)H2

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

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Hydraulics and Fluid Mechanics in ME
The motion of air mass in a tornado is a

free vortex at center and forced vortex outside
free vortex motion
forced vortex at center and free vortex outside
forced vortex motion

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Hydraulics and Fluid Mechanics in ME
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is

0.5 m3/s
1.5 m3/s
0.25 m3/s
2.5 m3/s

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