Discussion
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- Question
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
Options- A. 2 hours
- B. 3 hours
- C. 4 hours
- D. 5 hours.
- Correct Answer
- 4 hours
- 1. The screens are fixed
Options- A. perpendicular to the direction of flow
- B. parallel to the direction of flow
- C. at an angle 30° to 60° to the direction of flow
- D. none of these. Discuss
- 2. The sewage is pumped up
Options- A. from low lying areas
- B. from flat areas
- C. from basements
- D. across a high ridge
- E. all the above. Discuss
- 3. For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
Options- A. H2SO4
- B. HNO3
- C. HCl
- D. none of these. Discuss
- 4. A rain sanitary sewer is constructed to carry
Options- A. sanitary sewage
- B. storm sewage
- C. surface water
- D. ground water
- E. all the above. Discuss
- 5. When drainage to sewage ratio is 20, the peak dry weather flow is
Options- A. 20% of the design discharge
- B. slightly less than 5% of the design discharge
- C. slightly more than 5% of the design discharge
- D. none of these. Discuss
- 6. The minimum recommended diameter of sewers, is
Options- A. 5 cm
- B. 10 cm
- C. 15 cm
- D. 20 cm. Discuss
- 7. Aerobic bacterias
Options- A. flourish in the presence of free oxygen
- B. consume organic matter as their food
- C. oxidise organic matter in sewage
- D. All the above. Discuss
- 8. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is
Options- A. 0.30 m/sec
- B. 0.35 m/sec
- C. 0.40 m/sec
- D. 0.45 m/sec
- E. 0.50 m/sec. Discuss
- 9. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept
Options- A. 10.0
- B. 5.0
- C. 2.0
- D. 0.25 Discuss
- 10. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
Options- A. 0.68 m
- B. 0.88 m
- C. 1.36 m
- D. 1.76 m. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: at an angle 30° to 60° to the direction of flow
Correct Answer: all the above.
Correct Answer: H2SO4
Correct Answer: sanitary sewage
Correct Answer: slightly less than 5% of the design discharge
Correct Answer: 15 cm
Correct Answer: All the above.
Correct Answer: 0.45 m/sec
Correct Answer: 0.25
Correct Answer: 1.36 m
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