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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

0.5
0.5
0.4
0.515

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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
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

Weir
Notch
Mouthpiece
Nozzle

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Hydraulics and Fluid Mechanics in ME
The jet ratio is defined as the ratio of the

Diameter of Pelton wheel to the diameter of jet
Velocity of jet to the velocity of Pelton wheel
Diameter of jet to the diameter of Pelton wheel
Velocity of Pelton wheel to the velocity of jet

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Hydraulics and Fluid Mechanics in ME
In a venturi-flume, the flow takes place at

Gauge pressure
Absolute pressure
Atmospheric pressure
None of these

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Hydraulics and Fluid Mechanics in ME
The total energy line lies over the hydraulic gradient line by an amount equal to the

Pressure head + velocity head
Pressure head - velocity head
Pressure head
Velocity head

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