Chemical Engineering MCQs

Page No. 478

Pressure differential maintained across a continuous rotary vacuum filter is in the range of _______________ mm Hg column?


a50 to 100


b100 to 150


c250 to 500


d600 to 700


View Answer 250 to 500

The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends?


aEqual to


bMore than


cLess than


dEither B. or C.; depends on maximum permissible internal pressure


View Answer More than

In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?


a


b1


c20.8


d2


View Answer 1

A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design____________________?


aOnly if the opening is on spherical vessel


bOnly if the opening is on a vertical cylindrical vessel


cOnly if the opening is on a horizontal cylindrical vessel


dIrrespective of the shape of the vessel



(Le/D) for a Tee (used as elbow, entering branch) would be ____________________?


aLess than that for Tee (used as elbow, entering run)


bMore than that for Tee (used as elbow, entering run)


cAround 90


dBoth B. and C.


View Answer Both B. and C.

Mc Cable Thiele method used for finding theoretical stages in a distillation column assumes that the_____________________?


aSensible heat differences are small, because the temperature changes from tray to tray is small


bTrouton’s rule is applicable


cLiquid/vapor loading across the column remains constant


dAll A., B. and C.


View Answer All A., B. and C.

Typical static submergence for bubble cap plate column operating at atmospheric pressure may be around _________________?


a2.5″


b0.5″


c5″


d50% of the plate spacing


View Answer 0.5″

Which of the following types of reactors is the safest from operation point of view ?


aA vapor phase reactor


bPot type reactor


cA liquid phase reactor


dA liquid phase catalytic reactor


View Answer A vapor phase reactor

The distance between the centres of a rivet hole to the nearest edge of the plate is called _________________?


aPitch


bMargin


cBack pitch


dNone of these


View Answer Margin

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to ____________________?


a0.5 d


bd


c1.5 d


d2.5 d


View Answer 1.5 d

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