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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The flow in a pipe is turbulent when Reynold number is

None of these
Between 2000 and 2800
Less than 2000
More than 2800

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Hydraulics and Fluid Mechanics in ME
A flow through a long pipe at decreasing rate is called __________ uniform flow.

Steady
Both A and B
None of these
Unsteady

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Hydraulics and Fluid Mechanics in ME
In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

More than
Equal to
Less than
None of these

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Hydraulics and Fluid Mechanics in ME
The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

5.2 sec
10.4 sec
14.1 sec
4.1 sec

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Hydraulics and Fluid Mechanics in ME
According to fan laws, for fans having constant wheel diameter, the pressure varies

Cube of fan speed
Square of fan speed
Directly as fan speed
Square root of fan speed

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Hydraulics and Fluid Mechanics in ME
In case of an airfoil, the separation of flow occurs

at the extreme rear of body
at the extreme front of body
any where between rear and front of body depending upon Reynolds number
midway between rear and front of body

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