Waste Water Engineering problems
- 1. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
Options- A. 30 minutes
- B. 1 hour
- C. 1 hour and 30 minutes
- D. 2 hours
- E. 3 hours. Discuss
Correct Answer: 2 hours
- 2. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
Options- A. 5
- B. 10
- C. 15
- D. 20 Discuss
Correct Answer: 20
- 3. The effluent of a septic tank is
Options- A. fit for discharge into any open drain
- B. foul and contains dissolved and suspended solids
- C. as good as that from a complete treatment
- D. none of these. Discuss
Correct Answer: fit for discharge into any open drain
- 4. Pick up the correct statement from the following :
Options- A. The larger the sewer in size, more will be velocity
- B. The smaller the sewer in size, less will be velocity
- C. The larger the sewer in size, no deposition will take place
- D. The larger the sewer in size, deposition will take place. Discuss
Correct Answer: The larger the sewer in size, deposition will take place.
- 5. The presence of free ammonia in sewage, is detected by
Options- A. boiling
- B. adding pottassium permanganate
- C. adding sulphuric acid
- D. phenol-di-sulphuric acid. Discuss
Correct Answer: boiling
- 6. The clarigesters are
Options- A. circular septic tanks
- B. rectangular septic tanks
- C. circular Imhoff double tanks with bottom hoppers
- D. circular Imhoff double storey tanks without bottom hoppers. Discuss
Correct Answer: circular Imhoff double storey tanks without bottom hoppers.
- 7. During preliminary treatment of a sewage
Options- A. Oil and grease are removed from skimming tanks
- B. Floating materials are removed by screening
- C. Girt and sand are removed by girt chambers
- D. All the above. Discuss
Correct Answer: All the above.
- 8. A drop manhole is provided if
Options- A. a sewer drops from a height
- B. a branch sewer joins the main sewer at higher level
- C. a lamp is inserted to check obstruction
- D. none of these. Discuss
Correct Answer: a branch sewer joins the main sewer at higher level
- 9. Nitrogen cycle of sewage, is
Options- A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
- B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
- C. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
- D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
- E. None of these. Discuss
Correct Answer: Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
- 10. The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula
the maximum run off is
Options- A. 0.10 cumec
- B. 0.12 cumec
- C. 0.15 cumec
- D. 0.20 cumec. Discuss
Correct Answer: 0.15 cumec
More in Civil Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.