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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea

pitot tube
rotameter
hot wire anemometer
Venturimeter

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Hydraulics and Fluid Mechanics in ME
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be

5 meters of water column
2 meters of water column
6 meters of water Column
3 meters of water column

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Hydraulics and Fluid Mechanics in ME
If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water , the horse power required will be

0.75 B.H.P
1.5 B.H.P
Same
H.P./0.75

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Hydraulics and Fluid Mechanics in ME
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

4σ cosα/wd
wd/4σ cosα
σ cosα/4wd
4wd/σ cosα

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Hydraulics and Fluid Mechanics in ME
Differential monometer is used to measure

atmospheric pressure
pressure in pipes, channels etc
difference of pressure between two points
very low pressure

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Hydraulics and Fluid Mechanics in ME
Centrifugal pump is started with its delivery valve

Kept fully closed
Irrespective of any position
Kept fully open
Kept 50% open

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