Chemical Engineering MCQs

Page No. 501

Thin spherical shells subjected to internal pressure, develop ______________ stresses?


aRadial


bCircumferential


cBoth A. & B.


dNeither A. nor B.


View Answer Radial

Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about ______________ mm?


a10


b50


c100


d200


View Answer 100

Optimum reflux ratio in a continuous distillation column is determined by the__________________?


aMaximum permissible vapour velocity


bFlooding limit of the column


cTotal cost consideration (fixed cost of the column plus the cooling water & steam cost)


dNone of these



In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?


aZ.H.ρ/L


bL/Z.H.ρ


cH.ρ/L


dZ.H/ρL


View Answer Z.H.ρ/L

Lug support is meant for supporting _______________ vessels?


aLarge horizontal cylindrical


bTall but empty


cSmall


dThick walled tall


View Answer Small

The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)_________________?


a0.5 d


b0.75 d


cd


d2 d


View Answer d

Poisson’s ratio of a material is the ratio of unit lateral strain to the unit axial elongation within its elastic limit. The value of Poisson’s ratio for structural and pressure vessel steel may be taken as ____________________?


a0.01


b0.3


c0.75


d0.95


View Answer 0.3

Steam is preferred to be used as a heating medium in heat exchangers, because of its_________________?


aLow cost


bHigh latent heat


cNon-corrosive condensate


dHigh film co-efficient


View Answer High latent heat

Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin’s formula as___________________?


ad = 1.1 t


bd = 1.6 √t


cd = 1.5 t


dd = 3 √t


View Answer d = 1.6 √t

The thermal stress in a metallic bar does not depend upon the_____________________?


aChanges in temperature


bCross-sectional area


cBoth A. and B.


dNeither A. nor B.


View Answer Cross-sectional area

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