Chemical Engineering MCQs

Page No. 236

For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?


aV/Vmax = (x/r)1/7

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bV/Vmax = (r/x)1/7

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cV/Vmax = (x.r)1/7

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dNone of these

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View Answer V/Vmax = (x/r)1/7

The time of oscillation of a floating body is _________________?


aLonger, if Metacentric height is increased

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bIndependent of the Metacentric height

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cDependent on the buoyant forces only

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dNone of these

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View Answer None of these

The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for ______________ fluid?


aNewtonian

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bDilatant

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cPseudo-plastic

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dNon-Newtonian

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View Answer Newtonian

Vane anemometer __________________?


aIs an area meter

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bIs a variable head meter

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cRotates an element at a speed determined by the velocity of the fluid in which the meter is immersed

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dNone of these

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Diaphragm valves are used for handling _______________ fluids?


aCorrosive

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bViscous

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cNon-Newtonian

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dSolid suspended

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View Answer Corrosive

Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is _____________ mm?


a4

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b13

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c> 12.5

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d< 10

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View Answer > 12.5

Which of the following conditions must be satisfied for lift force to be developed ?


aThe body should be bluff body

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bThe body should be stream lined

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cCirculation around the body is essentially required

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dThe main stream velocity must approach the velocity of sound in that fluid medium

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Boundary layer separation is caused by the ____________________?


aReduction of pressure below vapour pressure

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bReduction of pressure gradient to zero

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cAdverse pressure gradient

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dReduction of boundary layer thickness to zero

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A floating/submerged body is always stable, if its centre of gravity___________________?


aLies above its centre of buoyancy

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bAnd centre of buoyancy coincide

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cLies below its centre of buoyancy

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dLies above its metacentre

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Which of the following is dimensionless ?


aAngular velocity

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bFanning friction factor

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cSpecific volume

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dNone of these

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