Chemical Engineering MCQs

Page No. 482

In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area) ?


aAa = Sa


b1.2 Aa = 1.2 Sa


cSa = 1.5 Aa


dAa = 1.5 Sa


View Answer Aa = Sa

Needle valves are generally not used for___________________?


aVery large diameter pipes


bHigh pressure throttling service


cVery accurate flow control


dSmaller sizes of pipe



Larger depth of liquid on the trays of a distillation column_________________?


aLeads to high tray efficiency


bResults in higher pressure drop per tray


cBoth A. & B.


dNeither A. or B.


View Answer Both A. & B.

In a cylindrical vessel subjected to internal pressure, the longitudinal stress ζL and the circumferential stress, ζn are related by___________________?


aζh = 2 ζL


bζh = ζL


cζh = ζL/2


dNo relation exists


View Answer ζh = 2 ζL

The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called____________________?


aDowncomer liquid seal


bStatic submergence


cSkirt clearance


dNone of these


View Answer Static submergence

With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT_________________?


aDecreases very rapidly


bIncreases very rapidly


cRemains constant


dIncreases linearly



Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of ______________ times the paddle diameter?


a0.1 to 0.25


b0.3 to 0.5


c0.5 to 0.6


d0.65 to 0.80


View Answer 0.1 to 0.25

Bubble cap plate column is___________________?


aA finite stage contactor


bUsed only for distillation, not for absorption


cA differential stage contactor


dA continuous contactor



Shortest distance between two tubes is___________________?


aCalled tube pitch


bCalled tube clearance


cMore in case of triangular pitch as compared to square pitch of tube layout


dNone of these


View Answer Called tube clearance

Rivets are generally specified by the____________________?


aHead diameter


bShank diameter


cOverall length


dNone of these


View Answer Shank diameter

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