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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Metacentric height is the distance between the metacentre and

water surface
center of buoyancy
center of gravity
center of pressure

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Hydraulics and Fluid Mechanics in ME
Specific weight of water in S.I. units is equal to

9.81 xlO6 N/m3
9.81 xlO3 N/m3
1000 N/m3
10000 N/m3

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Hydraulics and Fluid Mechanics in ME
Liquids transmit pressure equally in all the directions. This is according to

Newton's formula
Archimedes principle
Pascal's law
Boyle's law

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Hydraulics and Fluid Mechanics in ME
For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

a function of Reynolds number and relative roughness
dependent on relative roughness only
constant
dependent only on Reynolds number

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Hydraulics and Fluid Mechanics in ME
The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

μπ²NR²/60t
μπ²NR/60t
μπ²NR⁴/60t
μπ²NR³/60t

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Hydraulics and Fluid Mechanics in ME
When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

First rise and then fall
Steep
Horizontal
Nearly horizontal

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