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- Question
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
- Correct Answer
- 20
- 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
- 2. The digested sludge from septic tanks, is removed after a maximum period of
Options- A. 3 years
- B. 3.5 years
- C. 4 years
- D. 5 years. Discuss
- 3. The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is
Options- A. 1.095
- B. 1.085
- C. 1.075
- D. 1.065 Discuss
- 4. The standard B.O.D. of water is taken for
Options- A. 1 day
- B. 2 days
- C. 3 days
- D. 5 days
- E. 10 days. Discuss
- 5. In sewers the highest non-scouring velocity is achieved in
Options- A. glazed bricks sewers
- B. cast iron sewers
- C. cement concrete sewers
- D. stone ware sewers. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Waste Water Engineering problems
Search Results
Correct Answer: 2 hours
Correct Answer: 3 years
Correct Answer: 1.095
Correct Answer: 5 days
Correct Answer: glazed bricks sewers
Correct Answer: fit for discharge into any open drain
Correct Answer: The larger the sewer in size, deposition will take place.
Correct Answer: boiling
Correct Answer: circular Imhoff double storey tanks without bottom hoppers.
Correct Answer: All the above.
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