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


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


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


dNone of these


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

The time of oscillation of a floating body is _________________?


aLonger, if Metacentric height is increased


bIndependent of the Metacentric height


cDependent on the buoyant forces only


dNone of these


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


bDilatant


cPseudo-plastic


dNon-Newtonian


View Answer Newtonian

Vane anemometer __________________?


aIs an area meter


bIs a variable head meter


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


dNone of these



Diaphragm valves are used for handling _______________ fluids?


aCorrosive


bViscous


cNon-Newtonian


dSolid suspended


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


b13


c> 12.5


d< 10


View Answer > 12.5

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


aThe body should be bluff body


bThe body should be stream lined


cCirculation around the body is essentially required


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



Boundary layer separation is caused by the ____________________?


aReduction of pressure below vapour pressure


bReduction of pressure gradient to zero


cAdverse pressure gradient


dReduction of boundary layer thickness to zero



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


aLies above its centre of buoyancy


bAnd centre of buoyancy coincide


cLies below its centre of buoyancy


dLies above its metacentre



Which of the following is dimensionless ?


aAngular velocity


bFanning friction factor


cSpecific volume


dNone of these



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