Chemical Engineering MCQs

Page No. 216

A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3 ) is to be fluidised by water (density 1000 kg/m3 ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is________________?


a4.4 KPa


b2.94 KPa


c3.7 KPa


dNone of these


View Answer 4.4 KPa

Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?


aFlow rate


bMean velocity


cBoth ‘a’ & ‘b’


dNeither ‘a’ nor ‘b’


View Answer Mean velocity

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)____________________?


ad


b1/d


cζ


d1/ζ


View Answer ζ

Shear stress in a fluid flowing in a round pipe_________________?


aVaries parabolically across the cross-section


bRemains constant over the cross-section


cIs zero at the centre and varies linearly with the radius


dIs zero at the wall and increases linearly to the centre



Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is________________?


a90


b60


c45


d30


View Answer 60

For the transfer of solution of thick slurry, the pump used is a _____________ pump?


aReciprocating


bGear


cDiaphragm


dCentrifugal


View Answer Diaphragm

In fluid flow, cavitation is caused, if the____________________?


aFluid velocity decreases to zero


bTotal energy decreases


cBoth A. and B.


dFlow pressure approaches its vapor pressure at the prevailing temperature



Cavitation can be prevented by________________?


aSuitably designing the pump


bMaintaining the suction head sufficiently greater than the vapour pressure


cMaintaining suction head = developed head


dMaintaining suction head lower than the vapour pressure



Sewage sludge is ______________ type of non-Newtonian fluid?


aDilatant


bBingham plastic


cPseudo plastic


dNone of these


View Answer Bingham plastic

At high Reynolds number_________________?


aInertial forces control and viscous forces are unimportant


bViscous forces predominate


cInertial forces are unimportant and viscous forces control


dNone of these



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