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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
Surface energy per unit area of a surface is numerically equal to

surface tension
atmospheric pressure
force of adhesion
force of cohesion

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Hydraulics & Fluid Mechanics
Flow of water in a pipe about 3 meters in diameter can be measured by

orifice plate
pitot tube
venturi
rotameter

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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

675
300
337.5
600

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Hydraulics & Fluid Mechanics
When a body floating in a liquid, is displaced slightly, it oscillates about

center of buoyancy
center of pressure
metacentre
e.g. of body

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Hydraulics & Fluid Mechanics
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

maximum
minimum
negative value
could be any value

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Hydraulics & Fluid Mechanics
The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is (where R is the radius of pipe)

2/3 R
3/4 R
1/3 R
1/2 R

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