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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, turbulent flow occurs when Reynolds number is

less than 4000
between 2000 and 4000
less than 2000
more than 4000

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Hydraulics and Fluid Mechanics in ME
The velocity distribution for laminar flow through a circular tube

varies linearly from zero at walls to maximum at centre
None of these
varies parabolically with maximum at the centre
is constant over the cross-section

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

Equal to
Less than
More than
None of the listed here

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

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

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Hydraulics and Fluid Mechanics in ME
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the sub-merged body is called

buoyancy
metacentre
upthrust
reaction

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Hydraulics and Fluid Mechanics in ME
Centrifugal pump is started with its delivery valve

Kept fully open
Kept fully closed
Kept 50% open
Irrespective of any position

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