HYDRAULICS & FLUID MECHANICS QUIZ

The units of viscosity are

kg sec/metre

metre2/se

newton-sec/metre2

newton-sec/metre

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A large Roynold number is indication of

smooth and streamline flow

turbulent flow

highly turbulent flow.

LAMINAR FLOW

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For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

675

300

600

337.5

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For measuring flow by a venturimeter, if should be installed in

vertical line

horizontal line

in any direction and in any location.

inclined line with upward flow

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Pressure of the order of 10''' torr can be measured by

Bourdon tube

Pirani Gauge

Micro-manometer

ionisastion gauge

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A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of

4.6 M

4.0 M

4.8 M

4.2 M

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Choose the wrong statement

fluids conform to the shape of the con-taining vessels

fluids are capable of flowing

when in equilibrium, fluids can sustain shear forces

when in equilibrium, fluids cannot sustain tangential forces

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True one-dimensional flow occurs when

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

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

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

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

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SURFACE TENSION HAS THE UNITS OF

NEW TONS/M

NETON/M

NEWTONS

NEWTONS/M

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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

2/3 R

3/4 R

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