Discussion
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- Question
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).
- Correct Answer
- both (a) and (b)
- 1. 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
- 2. 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
- 3. 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
- 4. 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 Discuss
- 5. 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
- 6. 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
- 7. In Chezy's formula V = C rs for calculating the velocity of flow in circular sewer of diameter D running full, the value of hydraulic mean radius is
Options- A. D
- B.
- C.
- D.
- E.
Discuss
- 8. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is
Options- A. centrifugal pump
- B. pneumatic ejector
- C. reciprocating pump
- D. none of these. Discuss
- 9. Cement concrete sewers are only suitable if non-scouring velocity is between
Options- A. 2.5 to 3.0 m/sec
- B. 3.0 to 4.0 m/sec
- C. 3.5 to 4.5 m/sec
- D. 4.5 to 5.5 m/sec. Discuss
- 10. The flow velocity in detritus tanks is
Options- A. 0.05 m/sec
- B. 0.09 m/sec
- C. 1.25 m/sec
- D. none of these. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: 1.5
Correct Answer: 30 days
Correct Answer: smoke test
Correct Answer: 1 in 10
Correct Answer: All the above.
Correct Answer: All the above.
Correct Answer:
Correct Answer: centrifugal pump
Correct Answer: 2.5 to 3.0 m/sec
Correct Answer: 0.09 m/sec
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