Discussion
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- Question
The normal values of over flow rates for secondary sedimentation tanks, ranges between
Options- A. 25, 000 to 35, 000 litres/sqm/day
- B. 40, 000 to 50, 000 litres/sqm/day
- C. 50, 000 to 60, 000 litres/sqm/day
- D. 80, 000 to 10, 000 litres/sqm/day
- E. none of these.
- Correct Answer
- 25, 000 to 35, 000 litres/sqm/day
- 1. In very first stage of decomposition of the organic matter in sewage
Options- A. nitrites are formed
- B. nitrates are formed
- C. carbondioxide is formed
- D. ammonia is formed. Discuss
- 2. To maintain aerobic biological activity, the moisture content of the compost mass should be about
Options- A. 45%
- B. 50%
- C. 55%
- D. 60%. Discuss
- 3. The sewer pipes
Options- A. carry sewage as gravity conduits
- B. are designed for generating self-cleansing velocities at different discharge
- C. should resist the wear and tear caused due to abrasion
- D. all the above. Discuss
- 4. Bottom openings 15 cm x 15 cm in the standing baffle wall are provided
Options- A. 15 cm c/c
- B. 22.5 cm c/c
- C. 30 cm c/c
- D. 50 cm c/c. Discuss
- 5. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
Options- A. 1.39 m
- B. 1.49 m
- C. 1.59 m
- D. 1.69 m
- E. 1.79 m. Discuss
- 6. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
Options- A. 50 ppm
- B. 100 ppm
- C. 150 ppm
- D. 200 ppm
- E. 250 ppm. Discuss
- 7. The following is the physical characteristic of sewage
Options- A. turbidity
- B. colour
- C. odour
- D. temperature
- E. all the above. Discuss
- 8. Pick up the correct statement from the following :
Options- A. Maximum daily flow = 2 times the average daily flow
- B. Maximum daily flow =
x average daily flow - C. Sewers are designed for minimum permissible velocity at minimum flow
- D. All the above. Discuss
- 9. The underground sewers are more subjected to
Options- A. tensile force
- B. compressive force
- C. bending force
- D. shearing force. Discuss
- 10. Pick up the correct statement from the following :
Options- A. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
- B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
- C. Solubility of oxygen in sewage is 95% of that of distilled water
- D. Dissolved oxygen content of sewage, may be determined by Winkler's method
- E. All the above. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: ammonia is formed.
Correct Answer: 55%
Correct Answer: all the above.
Correct Answer: 22.5 cm c/c
Correct Answer: 1.69 m
Correct Answer: 200 ppm
Correct Answer: all the above.
Correct Answer: All the above.
Correct Answer: compressive force
Correct Answer: All the above.
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