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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The upper surface of a weir over which water flows is known is

weir top
crest
sill
nappe

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Hydraulics and Fluid Mechanics in ME
The magnitude of water hammer depends upon the

Elastic properties of the pipe material
All of these
Speed at which the valve is closed
Elastic properties of the liquid flowing through the pipe

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Hydraulics and Fluid Mechanics in ME
The mass per unit volume of a liquid at a standard temperature and pressure is called

Mass density
Specific gravity
None of these
Specific weight

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Hydraulics and Fluid Mechanics in ME
Which of the following pump is successfully used for lifting water to the boilers?

Centrifugal pump
Reciprocating pump
Airlift pump
Jet pump

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Hydraulics and Fluid Mechanics in ME
The maximum thickness of boundary layer in a pipe of radius r is

2r
r/2
r

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Hydraulics and Fluid Mechanics in ME
For hypersonic flow, the Mach number is

greater than 4
greater than unity
unity
greater than 2

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