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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For pipes, laminar flow occurs when Roynolds number is

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

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Hydraulics and Fluid Mechanics in ME
The bulk modulus of elasticity with increase in pressure

remains constant
decreases
increases
increases first upto certain limit and then decreases

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Hydraulics and Fluid Mechanics in ME
The Newton's law of resistance is based on the assumption that the

Planes of the body are completely smooth
Space around the body is completely filled with the fluid
All of these
Fluid particles do not exert any influence on one another

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Hydraulics and Fluid Mechanics in ME
The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is

2.5 m
3.0 m
2.4 m
4.0 m

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Hydraulics and Fluid Mechanics in ME
The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

π w ω² r³/4g
π w ω² r²/2g
π w ω² r⁴/4g
π w ω² r²/4g

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Hydraulics and Fluid Mechanics in ME
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

Medium speed pump with radial flow at outlet
High speed pump with axial flow at outlet
Slow speed pump with radial flow at outlet
High speed pump with radial flow at outlet

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