Chemical Engineering MCQs

Page No. 57

‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?


aIndustrial chimney exhaust


bAutomobiles exhaust


cPhotochemical reaction in polluted atmosphere


dBurning of domestic fuel


View Answer Automobiles exhaust

Which of the following is an adsorbent used for the removal of SO2 from gas/air ?


aBog iron


b Limestone powder or alkalised alumina


cSilica gel


dActive carbon



Radioactive solid nuclear wastes are disposed off by _________________?


aHigh temperature incineration


b Pathological incineration


c Pyrolysis


dUnderground burial in concrete containers



Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?


a84


b88


c80


d92


View Answer 84

Growth of ______________ is promoted by the presence of manganese in water?


a Files


bAlgae


cMicro-organisms


dMosquitoes


View Answer Micro-organisms

The pH value of oxidised sewage is about_____________________?


a1.8


b6.2


c 7.3


d13.4


View Answer 7.3

Arsenic pollutant is not generated in _______________ industries?


aTanneries


bGlass & ceramic


cBeverages


dAny of these


View Answer Beverages

Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?


aGrinding


bMachining


cCutting


dPolishing


View Answer Polishing

Fresh domestic sewage is _______________ in color?


aGrey


bDark brown


cRed


dBlack


View Answer Grey

Aerosols present in atmospheric air may be__________________?


aPositively charged


b Negatively charged


cNeutral


dCombination of all A., B. & C.



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