Chemical Engineering MCQs

Page No. 44

Fresh sewage is ______________ in nature?


a Acidic


bNeutral


cAlkaline


dHighly acidic


View Answer Alkaline

From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about ________________ ppm?


a 5


b50


c 500


d5000


View Answer 5

Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre?


a22


b42


c 332


d1050


View Answer 42

Which of the following fine dust removal equipments is the most efficient ?


aBag filter


bScrubber


cElectrostatic precipitator


dCyclone separator



Noise level in a quiet private business office is about _____________ decibels?


a25


b50


c70


d 85


View Answer 50

Which of the following is not a weightless pollutant ?


a SPM


bThermal pollution


cRadioactive rays


dNoise pollution


View Answer SPM

Noise pollution level in a chemical plant is expressed in __________________?


aRoentgen


bDecibel


c Hertz


d None of these


View Answer Decibel

Smog is ______________________?


aNothing but black smoke


bA combination of smoke and fog


cA liquid particle resulting from vapor condensation


dA solid particle e.g. fly-ash



Pick out the wrong statement ?


aAddition of methane to the furnace atmosphere reduces decarburising by hydrogen


b Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gasescarburise the surface of steel at annealing temperatures


cActive nitrogen (formed by cracking ammonia at the metal surface) cause nitride formationwith increase in surface hardness


dNone of these


View Answer None of these

Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by _____________________?


aChemical coagulation


bFloatation & skimming


cCentrifugation


dUltra filtration


View Answer Chemical coagulation

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