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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

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

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

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

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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)

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

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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

minimum
could be any value
negative value
maximum

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Hydraulics & Fluid Mechanics
THE THEORETICAL VALUE OF COEFFICIENT OF CONTRACTION OF A SHARP EDGED ORIFICE IS

0.611
1.01
0.86
0.95

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Hydraulics & Fluid Mechanics
The discharge of a liquid of kinematic viscosity 4 cm²/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is

LAMINAR FLOW
TRANSITION FLOW
TURBULENT FLOW
NOT PREDICTABLE FROM THE GIVEN DATA

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