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

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c3.7 KPa

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dNone of these

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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

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bMean velocity

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cBoth ‘a’ & ‘b’

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dNeither ‘a’ nor ‘b’

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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

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b1/d

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cζ

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d1/ζ

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View Answer ζ

Shear stress in a fluid flowing in a round pipe_________________?


aVaries parabolically across the cross-section

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bRemains constant over the cross-section

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cIs zero at the centre and varies linearly with the radius

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dIs zero at the wall and increases linearly to the centre

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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

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b60

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c45

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d30

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View Answer 60

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


aReciprocating

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bGear

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cDiaphragm

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dCentrifugal

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View Answer Diaphragm

In fluid flow, cavitation is caused, if the____________________?


aFluid velocity decreases to zero

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bTotal energy decreases

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cBoth A. and B.

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dFlow pressure approaches its vapor pressure at the prevailing temperature

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Cavitation can be prevented by________________?


aSuitably designing the pump

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bMaintaining the suction head sufficiently greater than the vapour pressure

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cMaintaining suction head = developed head

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dMaintaining suction head lower than the vapour pressure

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Sewage sludge is ______________ type of non-Newtonian fluid?


aDilatant

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bBingham plastic

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cPseudo plastic

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dNone of these

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View Answer Bingham plastic

At high Reynolds number_________________?


aInertial forces control and viscous forces are unimportant

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bViscous forces predominate

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cInertial forces are unimportant and viscous forces control

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dNone of these

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