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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 cohesion
force of adhesion

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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

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

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

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

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Hydraulics & Fluid Mechanics
A large Roynold number is indication of

highly turbulent flow.
LAMINAR FLOW
smooth and streamline flow
turbulent flow

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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

300
675
337.5
600

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Hydraulics & Fluid Mechanics
A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

decrease
increase
remain same
increase/decrease depending on depth of immersion

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