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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Specific weight of sea water is more that of pure water because it contains

dissolved salt
dissolved air
suspended matter
All of these

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Hydraulics & Fluid Mechanics
The line of action of the buoyant force acts through the centroid of the

volume of the floating body
volume of the fluid vertically above the body
submerged body
displaced volume of the fluid

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Hydraulics & Fluid Mechanics
Which of the following instrument can be used for measuring speed of an aeroplane

Orifice plate
Venturimeter
pitot tube
rotameter

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Hydraulics & Fluid Mechanics
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

2.4 m above the hydraulic gradient
10.0 m above the hydraulic gradient
5.0 above the hydraulic gradient
6.4 m above the hydraulic gradient

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Hydraulics & Fluid Mechanics
For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

600
300
337.5
675

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

the height of barometer will be less
both (B) and (C)
it is the best liquid
its vapour pressure is so low that it may be neglected

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