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Hydraulics & Fluid Mechanics

Hydraulics & Fluid Mechanics
The Prartdtl mixing length is

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

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Hydraulics & Fluid Mechanics
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

None of these
always above the centroid of the area
always below the centroid of the area
at the centroid of the submerged area

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Hydraulics & Fluid Mechanics
Drag force is a function of i) projected area of the body ii) mass density of the fluid iii) velocity of the body The correct answer is

(i) and (ii)
(ii) and (iii)
(i) and (iii)
(i), (ii) and (iii)

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Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

a sphere
a circular disc or plate held normal to flow
a cylinder
an airfoil

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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
increase
decrease

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Hydraulics & Fluid Mechanics
Separation of flow occurs when

the boundary layer comes to rest
All of these
the pressure intensity reaches a minimum
the cross-section of a channel is reduced

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