Chemical Engineering MCQs

Page No. 691

H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?


a2.0


b1.56


c1.0


d0.56


View Answer 2.0

Large scale drying of sugar is done in a _______________ dryer?


aSpouted bed


bTray


cRotary


dTruck


View Answer Rotary

Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is___________________?


aInsoluble in the liquid


bSoluble in the liquid


cNon-ideal in nature


dAt a fixed temperature



During the constant rate period of drying of a solid ?


a5Increased air humidity decreases the rate of drying


bIncreasing the air temperature decreases the drying rate


cSurface evaporation of unbound moisture occurs


dNone of these



Sucrose content in cane sugar may be around ______________________ percent ?


a50


b70


c95


d80


View Answer 95

Use of hydrated lime in water treatment_________________?


aBefore filtration, reduces the bacterial load on filters


bAfter filtration, combats the corrosiveness of water due to the presence of O2 & CO2


cIs to adjust the pH value


dAll A , B. and C.


View Answer All A , B. and C.

Grignard reagent is chemically known as ____________________?


aEthyl magnesium chloride


bMethyl magnesium chloride


cDichlorophenol


dMonochloroacetic acid



Raw materials required for the manufacture of __________________ is acetylene and hydrochloric acid?


aPhthalic anhydride


bVinyl chloride


cMaleic anhydride


dDacron


View Answer Vinyl chloride

Parathion and Malathion are _____________________?


aPesticides


bPlasticisers for unsaturated polyesters


cPain-relieving drugs (analgesic)


dTranquilisers


View Answer Pesticides

Which of the following is not produced on commercial scale from sea water ?


aBromine


bMagnesium compounds


cPotassium compounds


dSodium sulphate


View Answer Sodium sulphate

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