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Hydraulics & Fluid Mechanics

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

337.5
600
300
675

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Hydraulics & Fluid Mechanics
Normal depth in open channel flow is the depth of flow corresponding to

uniform flow
laminar flow
Steady flow
unsteady flow

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

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

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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

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

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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

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

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Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

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

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