Chemical Engineering MCQs

Page No. 484

Pressure drop per tray in the atmospheric distillation column is about ________________ psi?


a0.01 – 0.5


b0.07 – 0.12


c0.5 – 1.0


d1 – 3


View Answer 0.07 – 0.12

In a thin cylindrical shell, the hoop stress is ________________ stress?


aRadial


bCircumferential tensile


cCompressive


dLongitudinal



The maximum liquid gradient over a tray must not exceed__________________?


a0.5″ -1.25″


b2″-3.5″


c5″


dHalf the tray spacing


View Answer 0.5″ -1.25″

In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?


a2.5


b5


c12.5


d17.5


View Answer 5

Flanges are connected to pipes by _______________________?


aScrewing


bWelding


cBrazing


dAll A., B. and C.


View Answer All A., B. and C.

Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower ?


aPlate tower is preferred, if interstage cooling is required to remove heats of reaction or solution


bPlate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids


cThe total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty


dIn operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes



Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support?


aLug


bSkirt


cSaddle


dGuy wire


View Answer Saddle

In case of design of a shell and tube heat exchanger___________________?


aMinimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch


bMinimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter


cO.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres


dAll A., B. & C.


View Answer All A., B. & C.

With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter___________________?


aIncreases


bDecreases


cRemain unaffected


dNone of these


View Answer Decreases

The equivalent diameter for pressure drop is _______________ that for heat transfer?


aSmaller than


bGreater than


cEqual to


dNot related with


View Answer Not related with

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