Chemical Engineering MCQs

Page No. 64

Presence of high concentration of ozone and smog in atmospheric air causes the __________________?


aEmbrittlement & decrease of folding resistance of paper


b Cracking of rubber products


cFading of dye on textiles


dDamage of electrical insulator on high tension power line



Main pollutants released from petroleum refineries is__________________?


aCO, SO2 & H2S


b CO2, NO & SO3


cCO2, H2S & NO2


dSO3, NO2 & CO2


View Answer CO, SO2 & H2S

Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?


aCoal ash


bPotassium cyanide


c Ortho-xylene


dNone of these


View Answer Potassium cyanide

In sewage treatment, its sedimentation is speeded up by commonly adding__________________?


aHydrochloric acid


bLime


c Copper sulphate


d Sodium sulphate


View Answer Lime

What are the methods of treatment & disposal of radioactive wastes ?


aEvaporation & chemical precipitation


bBiological methods & adsorption in ion exchange materials


cFixing into a solid mass with cement and sinking deep in the sea


dAll A., B. & C.


View Answer All A., B. & C.

Nitrogen oxides (NOx) is not produced in the ______________ industry?


aNitric acid making


bNitrogenous fertiliser


cDetergent


dAny of these


View Answer Detergent

TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?


a5


b100


c1000


d 2000


View Answer 5

In water treatment, alum [Al2(SO4)3] is used for the process of __________________?


aFiltration


bCoagulation


cSedimentation


dDisinfection


View Answer Coagulation

Which of the following is not a secondary air pollutant ?


a Ozone


bPhotochemical smog


cSulphur dioxide


dAll A., B. & C.


View Answer Sulphur dioxide

Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?


a Dust catcher (gravity type)


bCyclone separator


cBag filter


dHollow wet scrubber



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