Discussion
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- Question
Polluted water having low BOD are most economically treated in
Options- A. sedimentation tanks
- B. oxidation ponds
- C. sludge digester
- D. clarifier
- Correct Answer
- oxidation ponds
- 1. Aerobic biological oxidation ponds used for the purification of polluted water
Options- A. destroys/removes pathogen from the sewage.
- B. is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents.
- C. destroys/removes pathogen much more effectively if the sewage is chlorinated.
- D. all (a), (b) & (c). Discuss
- 2. H2S present in gaseous stream can be removed by adsorption on
Options- A. silica gel
- B. active carbon
- C. bog iron
- D. limestone powder Discuss
- 3. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by
Options- A. natural aeration of water stream.
- B. photosynthetic action of algae.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 4. Most of the atmospheric air pollutants are present in large quantity in
Options- A. stratosphere
- B. thermosphere
- C. trophosphere
- D. mesosphere Discuss
- 5. Scale formation in boiler is controlled by
Options- A. preheating of feed water.
- B. reduction in hardness, silica & alumina in feed water.
- C. keeping the pH value of feed water just below 7.
- D. eliminating H2S in feed water. Discuss
- 6. Dust collection efficiency of a cyclone separator depends upon its
Options- A. diameter.
- B. inlet gas velocity.
- C. overall height.
- D. all (a), (b) & (c). Discuss
- 7. Pick out the wrong statement.
Options- A. Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water.
- B. Cooling and freezing of water kills the bacteria present in it.
- C. With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing.
- D. Dissolved oxygen content in high pressure boiler feed water should be nil. Discuss
- 8. Tolerable limit of nitrogen oxides in air is __________ ppm.
Options- A. 0.1
- B. 1
- C. 5
- D. 25 Discuss
- 9. Which of the following is the most detrimental for water used in high pressure boiler?
Options- A. Silica
- B. Turbidity
- C. Phenol
- D. Dissolved oxygen Discuss
- 10. Which is a secondary air pollutant?
Options- A. Photochemical smog
- B. Sulphur dioxide
- C. Nitrogen dioxide
- D. Dust particles Discuss
Environmental Engineering problems
Search Results
Correct Answer: all (a), (b) & (c).
Correct Answer: bog iron
Correct Answer: both (a) & (b).
Correct Answer: trophosphere
Correct Answer: reduction in hardness, silica & alumina in feed water.
Correct Answer: all (a), (b) & (c).
Correct Answer: Cooling and freezing of water kills the bacteria present in it.
Correct Answer: 5
Correct Answer: Silica
Correct Answer: Photochemical smog
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