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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
The most efficient section of a channel is

Trapezoidal
Square
Rectangular
Triangular

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Hydraulics and Fluid Mechanics in ME
Metacentric height for small values of angle of heel is the distance between the

centre of gravity and centre of buoy-ancy
centre of gravity and metacentre
free surface and centre of buoyancy
centre of buoyancy and metacentre

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Hydraulics and Fluid Mechanics in ME
The force exerted (in Newton) by a jet of water impinging normally on a fixed plate is (where w = Specific weight of water in N/m3, a = Cross-sectional area of jet in m², and V = Velocity of jet in m/s)

waV / g
waV / 2g
waV² / g
waV² / 2g

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

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

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Hydraulics and Fluid Mechanics in ME
Ratio of inertia force to surface Jension is known as

Reynold’s number
Weber’s number
Mach number
Froude number

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Hydraulics and Fluid Mechanics in ME
The ratio of the inertia force to the elastic force is called

Froude's number
Reynold's number
Weber's number
Mach number

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