Chemical Engineering MCQs

6108 MCQs  (Page 523 of 611)

Biological oxidation ponds remove organic matters present in the polluted water by _______________?
A. Using the activities of bacteria and other micro organisms
B. Aerobic oxidation
C. Both a. & b.
D. Neither a. nor b.
Which of the following plants does not emit appreciable amount of SO2 in atmosphere ?
A. Thermal power plant
B. Petroleum refinery
C. Nitric acid plant
D. Sulphuric acid plant
Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?
A. Respiratory & lung disease
B. Reduction in plant’s productivity owing to acid rain
C. Corrosion of building materials
D. All a., b. and c.
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
Out of the following, TLV of _______________ is maximum (about 500 ppm)?
A. Carbon dioxide
B. Toluene
C. Carbon disulphide
D. Acetaldehyde