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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
When the Mach number is between ___ the flow is called super-sonic flow.

4 and 6
1 and 2.5
2.5 and 4
1 and 6

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Hydraulics and Fluid Mechanics in ME
Rotameter is a device used to measure

absolute pressure
flow
rotation
velocity of fluid

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Hydraulics and Fluid Mechanics in ME
A hydraulic intensifier normally consists of

A cylinder and a ram
Two coaxial rams and two cylinders
Two cylinders, two rams and a storage device
A cylinder, a piston, storage tank and control valve

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Hydraulics and Fluid Mechanics in ME
The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

d = (D⁵/8fl)1/5
d = (D⁵/8fl)1/3
d = (D⁵/8fl)1/2
d = (D⁵/8fl)1/4

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Hydraulics and Fluid Mechanics in ME
For very great pressures, viscosity of moss gases and liquids

shows erratic behaviour
decreases
increases
remains same

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Hydraulics and Fluid Mechanics in ME
In an isothermal atmosphere, the pressure

decreases linearly with elevation
varies in the same way as the density
remains constant
increases exponentially with elevation

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