Chemical Engineering — Test 175
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Question 1
Biological oxidation ponds remove organic matters present in the polluted water by _______________?
Question 2
Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
Question 3
The pH value of potable water should be between____________________?
Question 4
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?
Question 5
Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?
Question 6
Corrosion in boilers can be prevented by _________________?
Question 7
Fine grit present in sewage is removed in the _____________ during sewage treatment?
Question 8
Out of the following, TLV of _______________ is maximum (about 500 ppm)?
Question 9
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?
Question 10
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _____________ μg/m3.(μg-microgram)?