Chemical Engineering MCQs

Page No. 499

Which of the following packing materials provides for maximum mass transfer ?


aRaschig rings


bRaschig rings


cCross-partition rings


dAll give the same value


View Answer Cross-partition rings

Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower ?


aSize, shape, orientation and surface of the packing particles


bDensity and viscosity of fluids


cFluid flow rates


dAll A., B. and C.


View Answer All A., B. and C.

The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about ______________ times the design pressure?


a1.5 to 2


b3 to 4


c4 to 5


d> 5


View Answer 1.5 to 2

____________ head is the most economical for cylindrical vessels designed for operating at high pressure (> 15 atm.)?


aHemispherical


bDished


cEllipsoidal


dConical


View Answer Ellipsoidal

The slope of the feed line in distillation operation is given by (where, q = fraction of the feed stream that is liquid ?


a-q


b-q/(1-q)


c-q/(q-1)


dNone of these


View Answer -q/(1-q)

The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from__________________?


a2 to 3


b3 to 5


c4 to 8


d6 to 12


View Answer 4 to 8

Liquid gradient over the tray results due to the___________________?


aResistance offered to flow of liquids by caps & risers and the flow of gas


bLow gas velocity


cLarge plate spacing


dLarge reflux ratio



Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the_______________?


aFlow rates of each fluid


bType and size of packing


cConcentration of each fluid


dAll A, B. & C.


View Answer All A, B. & C.

Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to ____________________?


ahG = 1.004G0.37


b1.004G0.8


chG = 0.0176G0.37


d0.0176G1.37


View Answer hG = 1.004G0.37

The most common standard size of bubble caps used in industrial operation is___________________?


a1″ dia cap with 0.5″ dia riser


b6″ dia cap with 4″ dia riser


c8″ dia cap with 1″ dia riser


d4″ dia cap with 8″ dia riser



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