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- Question
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
Options- A. 1 in 5
- B. 1 in 10
- C. 1 in 15
- D. 1 in 20
- E. 1 in 25
- Correct Answer
- 1 in 10
- 1. 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
- 2. The underground sewers are more subjected to
Options- A. tensile force
- B. compressive force
- C. bending force
- D. shearing force. Discuss
- 3. 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
- 4. The following is the physical characteristic of sewage
Options- A. turbidity
- B. colour
- C. odour
- D. temperature
- E. all the above. Discuss
- 5. 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
- 6. For drainage pipes in buildings the test applied before putting them to use, is
Options- A. water test
- B. smoke test
- C. straightness test
- D. all the above. Discuss
- 7. In normal conditions, the period for sludge digestion, is
Options- A. 10 days
- B. 20 days
- C. 30 days
- D. 60 days
- E. 90 days. Discuss
- 8. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is
Options- A. 1.5
- B. 2.0
- C. 3.0
- D. 4.0 Discuss
- 9. For efficient working of a sewer, it must be ensured that
Options- A. minimum velocity of 0.45 m/sec, is maintained at its minimum flow
- B. a maximum velocity of 0.90 m/sec, is maintained at its maximum flow
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
- 10. Pick up the correct statement from the following :
Options- A. Rate of digestion of slugde is more at higher temperature
- B. Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
- C. Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
- D. 90% of digestion takes place in 30 days at 29°C, the optimum mesophilic temperature
- E. All the above. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: All the above.
Correct Answer: compressive force
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: 200 ppm
Correct Answer: smoke test
Correct Answer: 30 days
Correct Answer: 1.5
Correct Answer: both (a) and (b)
Correct Answer: All the above.
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