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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

None of these
independent of shear stress
zero at the pipe wall
maximum at the pipe wall

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Hydraulics & Fluid Mechanics
Uniform flow occurs when

size and cross section change uniformly along length
the flow is streamline
size and shape of the cross section in a particular length remain constant
the flow is steady

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Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of diffusion
force of cohesion
force of friction
force of adhesion

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Hydraulics & Fluid Mechanics
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used ?

1 : 2.5
1 : 5
1 :25
1:50

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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
could be any value
negative value

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Hydraulics & Fluid Mechanics
For a floating body to be in equilibrium

All of these
meta center should be above e.g.
a righting couple should be formed
center of buoyancy and e.g. must lie on same vertical plane

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