HYDRAULICS & FLUID MECHANICS QUIZ

Surface energy per unit area of a surface is numerically equal to

force of cohesion

surface tension

atmospheric pressure

force of adhesion

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The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

the area is horizontal

the area is vertical

the area is inclined

All of these

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For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

directly proportional to pipe wall roughness and independent of Reynolds number

directly proportional to Reynolds number and independent of pipe wall roughness

inversely proportional to Reynolds number and directly proportional to pipe wall roughness

inversely proportional to Reynolds number and indpendent of pipe wall roughness

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Steady flow occurs when

the magnitude and direction of the velocity do not change from point to point in the fluid

the direction and magnitude of the velocity at all points are identical

the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

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The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is

1/2

1/4

2/3

1/3

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A perfect gas

is incompressible

is of theoretical interest

has constant viscosity

None of these

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An open vessel of water is accelerated up an inclined plane. The free water surface will

be horizontal

make an angle in direction of inclination of inclined plane

make an angle in opposite direction to inclination of inclined plane

any one of above is possible

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To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than

2.4 m above the hydraulic gradient

10.0 m above the hydraulic gradient

6.4 m above the hydraulic gradient

5.0 above the hydraulic gradient

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In a Sutro weir, the discharge is proportional to (where H is head)

H5/2

H3/2

H1/2

H

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According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to

less than the weight of the body

more than the weight of the body

the weight of the body

weight of the fluid displaced by the body

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