Natural aeration of water stream
Photosynthetic action of algae
Both A & B
Neither A nor B
✅ The correct answer is option C.
Chemical Engineering MCQs
Presence of high concentration of ozone and smog in atmospheric air causes the
Embrittlement & decrease of folding resistance of paper
Cracking of rubber products
Fading of dye on textiles
Damage of electrical insulator on high tension power line
✅ The correct answer is option B.
High noise levels produced during operation of fans and compressors can be reduced by using
Mufflers (silencers)
Accoustical absorbent
Lagging of noisy duct
None of these
✅ The correct answer is option A.
Iron & manganese present in the polluted water is removed by
Simple filtration
Oxidation followed by settling & filtration
Chemical coagulation
Chlorination only
✅ The correct answer is option B.
Which of the following processes is involved in the biochemical treatment of sewage effluents?
Oxidation
Reduction
Dehydration
Fermentation
✅ The correct answer is option A.
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
Fire hazards
Explosion hazards
Persistent foam
Depletion of dissolved oxygen
✅ The correct answer is option C.
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
Explosion
Non biodegradable foam
Undesirable plant growth
Corrosion
✅ The correct answer is option A.
In water treatment, alum[Al2(SO₄)3] is used for the process of
Filtration
Coagulation
Sedimentation
Disinfection
✅ The correct answer is option B.
Noise level during normal conversation among men is about __________ decibles.
10
45
90
115
✅ The correct answer is option B.
Presence of nitrates in water in excess of 50 ppm causes
Mathenoglobenemia
Gastroentetitis
Asphyxiation
Tooth decay
✅ The correct answer is option A.