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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
A fluid in equilibrium can't sustain

Tensile stress
Shear stress
Bending stress
Compressive stress

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Hydraulics and Fluid Mechanics in ME
The undershot water wheels are those in which

None of these
The wheel runs entirely by the weight of water
The wheel runs entirely by the impulse of water
The wheel runs partly by the weight of water and partly by the impulse of water

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Hydraulics and Fluid Mechanics in ME
Impulse turbine is generally fitted

About 2.5 m above the tail race to avoid cavitations
Little above the tail race
At the level of tail race
Slightly below the tail race

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Hydraulics and Fluid Mechanics in ME
Hydrometer is used to determine

specific gravity of solids
relative humidity
specific gravity of gases
specific gravity of liquids

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Hydraulics and Fluid Mechanics in ME
In an immersed body, centre of pressure is

Above the centre of gravity
Could be above or below e.g. depending on density of body and liquid
At the centre of gravity
Below be centre of gravity

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Hydraulics and Fluid Mechanics in ME
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × sloping side
1/4 × (depth + breadth)
1/2 × depth
1/2 × breadth

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