Chemical Engineering MCQs

Page No. 494

For a given design of bubble cap, the number of bubble caps to be used per tray is set by the _________________?


aAllowable gas velocity through the slots


bPlate spacing


cDiameter of the column


dAll A., B. and C.



The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?


a0.1-0.2


b0.2-0.5


c0.4-0.9


d1.2-1.5


View Answer 0.4-0.9

The minimum tray spacing in distillation column of diameter less than 3 ft is normally _____________ inches?


a6


b18


c24


d34


View Answer 6

For a cylindrical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness ?


aHemispherical


bEllipsoidal (2 : 1)


cConical


dFlat plate


View Answer Ellipsoidal (2 : 1)

In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?


a2.5


b7.5


c15


d15


View Answer 7.5

Joint efficiency (J) for a seamless pipe is_______________?


a1


b0.85


c1.5


d< 0.5


View Answer 1

In condenser, the cooling water is passed in the tube side in a pass arrangement, because________________?


aIt reduces heat transfer area


bMore thinner tubes can be used


cPressure drop is reduced


dIt makes condenser compact



Maximum allowable vapour velocity in a bubble cap tower is determined by the ____________________?


aEntrainment considerations


bVapour density


cDiameter of the column


dNone of these



Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_______________?


a0.4-0.6


b0.35-0.75


c0.1-0.2


d0.55-0.85


View Answer 0.1-0.2

Baffles may be eliminated for_________________?


aLow viscosity liquids (< 200 poise)


bHigh viscosity liquids (> 600 poise)


cLarge diameter tanks


dNone of these



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