Chemical Engineering MCQs

Page No. 50

Carbonaceous particles having size less than 1 μm are called___________________?


aGrit

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bAggregates

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c Aerosols

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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

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bHighly

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cExtremely

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dVery extremely

✓


View Answer Very extremely

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


a 50 ppm

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b 100 ppm

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c300 ppm

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d700 ppm

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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

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bSr-90

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cAu-198

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dRa-226

✓


View Answer Ra-226

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


a Foaming from boilers

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b Its dissolved oxygen content

✓


cIts silica content

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dCaustic embrittlement

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


aMercury

✓


bBrine

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cPhosphate

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dNone of these

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View Answer Mercury

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


aHighly

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b Moderately

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cExtremely

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dVery extremely

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View Answer Moderately

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


aPhosgene

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b Methyl isocyanate (MIC)

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cCarbon monoxide

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dSulphur dioxide

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


aBy chemical coagulation

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bIn sedimentation tanks equipped with mechanical scrapper

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c In vacuum filter

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d In clarifiers

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Removal of ______________ is accomplished by aeration of water?


aDissolved gases

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b Suspended solids

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cDissolved solids

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d None of these

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View Answer Dissolved gases

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