Chemical Engineering — Test 176
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Question 1
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) ?
Question 2
Which of the following pollutants, if present in atmosphere is detectable by its odour ?
Question 3
Removal of ______________ is accomplished by aeration of water?
Question 4
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
Question 5
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?
Question 6
Inhalation of silica dust causes a disease called__________________?
Question 7
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
Question 8
A shallow pond in which the sewage is retained and biologically treated is called__________________?
Question 9
Main pollutants released from iron & steel industry is__________________?
Question 10
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?