Chemical Engineering MCQs

Page No. 51

Which of the following pollutants, if present in atmosphere is detectable by its odour ?


aCO


bSO2


c NO2


dCO2


View Answer SO2

Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?


aLagooning


bActivated carbon adsorption


cBiological oxidation pond


dChemical coagulation



Pick out the correct statement ?


aChemical oxygen demand (COD) is a measure of chemically oxidisable organic matter present


bCOD is determined by oxidising the organic matter present in water with potassium dichromate in cone, sulphuric acid solution at boiling temperature for specified time


cCOD is related to BOD of a given waste in water but the relationship varies for different wastes. Typically COD of potable water may be 1-2 mg/litre


dAll A., B. and C.


View Answer All A., B. and C.

When the concentration of SO2 in air is greater than ______________ ppm, it gives a pungent smell?


a 0.01


b0.1


c1


d4


View Answer 4

Which is the most practical and economical method for removal of suspended solid matter from polluted water ?


aSedimentation


bSkimming off


cChlorination


dBiological oxidation


View Answer Sedimentation

Iron & manganese present as pollutant in water cannot be removed by__________________?


aIon exchange process


b Oxidation followed by settling & filtration


c Lime soda process or manganese zeolite process


dChlorination


View Answer Chlorination

In the context of the chemical process industries, the term BOD is normally associated with the_____________________?


aCharacterisation of solid wastes


bOrganic concentration in gaseous effluents


cCharacterisation of liquid effluents


dCharacterisation of boiler feed water



Pick out the wrong statement pertaining to ‘green house’ for the plants ?


a‘Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation


bThe emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed


cGreen house effect’ in earth’s atmosphere is due to increasing CO2 level in atmosphere, where


d‘Green house’ is colder than the outside atmosphere



In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?


at = 15 – 0.0065h


bt = 15 + 0.0065h


ct = 0.0035h -15


dt = 15 – 0.0035h


View Answer t = 15 – 0.0065h

Which of the following is the most severe air pollutant ?


aHydrocarbons


bNOx


cSO2


dCO


View Answer NOx

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