Chemical Engineering MCQs

Page No. 651

Absorption accompanied with chemical reaction is exemplified by the absorption of___________________?


aAmmonia in water


bBenzol present in coke oven gas by wash oil


cSO2 in alkaline solution


dAll A., B. and C.



Under conditions of flooding in packed tower, the gas pressure drop___________________?


aDecreases rapidly


bIncreases rapidly


cRemain constant


dIs maximum


View Answer Is maximum

Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve) ____________________?


aS2/S1


bS1/S2


cS1 – S2


dS1 × S2


View Answer S1/S2

Detergent solution is dried to a powder in a ________________________?


aSpray dryer


bSpouted bed dryer


cTunnel dryer


dPan open to atmosphere


View Answer Spray dryer

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around____________________?


a0.60


b0.24


c1


d0.72


View Answer 1

To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate) ____________________?


aIncrease both ‘G’ and ‘S’


bDecrease both ‘G’ and ‘S’


cIncrease ‘S’ and decrease ‘G’


dIncrease ‘G’ and decrease ‘S’



In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the________________________?


aRange is 15°F


bApproach is 10°F


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Which of the following equipments is not used in liquid-liquid extraction ?


aPachuka tank


bAgitated vessels


cCentrifugal extractors


dPacked towers


View Answer Pachuka tank

When the ____________________ the relative humidity of air decreases, despite an increase in the absolute humidity?


aTemperature rises


bPressure rises


cTemperature falls


dPressure falls


View Answer Temperature rises

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process ?


aFlow rate of inlet air


bRelative humidity of outlet air


cHumidity of inlet air


dTemperature of the solid



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