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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The discharge through a reaction turbine ___ with the increase in unit speed.

Decreases
Increases
Remain same
None of the listed here

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Hydraulics and Fluid Mechanics in ME
In reaction turbine, draft tube is used

For safety of turbine
To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section
To increase flow rate
To transport water downstream without eddies

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

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Hydraulics and Fluid Mechanics in ME
A metal with specific gravity of o floating in a fluid of same specific gravity a will

float over fluid
partly immersed
sink to bottom
be fully immersed with top surface at fluid surface

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Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure below the nappe is atmospheric
The pressure above the nappe is atmospheric
The pressure below the nappe is negative
The pressure above the nappe is negative

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Hydraulics and Fluid Mechanics in ME
In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

1/8 to 1/4
1/16 to 1/8
1/3 to 1/2
1/4 to 1/3

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