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Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME
For very great pressures, viscosity of moss gases and liquids

remains same
increases
decreases
shows erratic behaviour

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Hydraulics and Fluid Mechanics in ME
The efficiency of a Pelton wheel working under constant head ________ with the increase in power.

Remain same
Decreases
None of these
Increases

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Hydraulics and Fluid Mechanics in ME
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to empty the tank completely will be

(2AH₁)/(Cd × a√2g)
(2A√H₁)/(Cd × a√2g)
(2AH₁3/2)/(Cd × a√2g)
(2AH₁²)/(Cd × a√2g)

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Hydraulics and Fluid Mechanics in ME
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre

Lies below its centre of gravity
Lies between the centre of buoyancy and centre of gravity
Coincides with its centre of gravity
Lies above its centre of gravity

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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
Units of surface tension are

distance
energy/unit area
it has no units
both of the above

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