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.Management Sciences
Category: Chemical Environmental Engineering
The main industrial source of emission of hydrogen sulphide air pollutant is________________?
A. Petroleum refineries
B. Coal based thermal power plants
C. Pulp and paper plant
D. Metallurgical roasting & smelting plant
Iron & manganese present in the polluted water is removed by __________________?
A. Simple filtration
B. Oxidation followed by settling & filtration
C. Chemical coagulation
D. Chlorination only
Corrosion in boilers can be prevented by _________________?
A. Deaeration of feed water
B. Enhancing pH of feed water by adding alkali
C. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen
and prevents corrosion
D. All A., B. and C.
Permissible safe limit (TLV) of _____________ toxic gas is 100-1000 parts per million (ppm)?
A. Highly
B. Moderately
C. Extremely
D. Very extremely
Smog is ______________________?
A. Nothing but black smoke
B. A combination of smoke and fog
C. A liquid particle resulting from vapor condensation
D. A solid particle e.g. fly-ash
‘Particulate’ air pollutants are finely divided solids and liquids. Which of the following is not a „particulate‟ ?
A. Dust & mists
B. Smoke & fumes
C. Photochemical smog & soot
D. None of these
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