Chemical Engineering MCQs

Page No. 50

Carbonaceous particles having size less than 1 μm are called___________________?


aGrit


bAggregates


c Aerosols


dSmoke


View Answer Smoke

Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?


aModerately


bHighly


cExtremely


dVery extremely


View Answer Very extremely

Beyond what concentration of H2S in air, acute danger to human life exists ?


a 50 ppm


b 100 ppm


c300 ppm


d700 ppm


View Answer 700 ppm

Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters ?


aI-131


bSr-90


cAu-198


dRa-226


View Answer Ra-226

Deaeration of high pressure boiler feed water is done to reduce ___________________?


a Foaming from boilers


b Its dissolved oxygen content


cIts silica content


dCaustic embrittlement



The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________?


aMercury


bBrine


cPhosphate


dNone of these


View Answer Mercury

Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?


aHighly


b Moderately


cExtremely


dVery extremely


View Answer Moderately

The Killer gas which caused Bhopal gas tragedy in 1984 was________________?


aPhosgene


b Methyl isocyanate (MIC)


cCarbon monoxide


dSulphur dioxide



Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?


aBy chemical coagulation


bIn sedimentation tanks equipped with mechanical scrapper


c In vacuum filter


d In clarifiers



Removal of ______________ is accomplished by aeration of water?


aDissolved gases


b Suspended solids


cDissolved solids


d None of these


View Answer Dissolved gases

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