Chemical Engineering MCQs

Page No. 490

For high pressure process equipments/vessels, the connected nozzle should be____________________?


aWelded


bScrewed


cFlanged


dBrazed


View Answer Flanged

Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency___________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease depending upon the plate spacing


View Answer Increases

Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure ?


aLarger dia vessel


bSmaller dia vessel


cLarger dia long vessel


dStrength of the vessel is same irrespective of the diameter


View Answer Smaller dia vessel

For a cylindrical vessel of moderate height, the weld joint efficiency for joints parallel to the cylindrical axis is given as 1.0; while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylindrical vessel, what value of weld joint efficiency should be used ?


a0.8


b0.9


c1.0


d(0.8)0.5


View Answer 0.8

25 per cent cut segmental baffle means that the baffle__________________?


aHeight is 75% of the I.D. of the shell


bHeight is 25% of the I.D. of the shell


cSpacing is 75% of its height


dWidth is 25% of its height



In a shell and tube heat exchanger, the ‘tube pitch’ is defined as the _____________________?


aO.D. of the tube for square pitch


bShortest distance between two adjacent tube holes


cShortest centre to centre distance between adjacent tubes


dNone of these



A riveted joint does not fail by _____________________ of rivets?


aTearing


bShearing


cTearing of the plate across a row


dNone of these


View Answer None of these

Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is_____________?


aMore


bSame


cLess


dTwice


View Answer Less

Diameter of bubble caps used in high pressure columns is ______________ as compared to that used in identical vacuum columns?


aLess


bMore


cSame


dEither A. or B.; no generalisation can be made


View Answer More

In packed absorption tower, onset of flooding usually occurs at a pressure drop of about ______________ mm of water column per metre height of packing?


a25-50


b50-75


c200-250


d750-1000


View Answer 50-75

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