Waste Water Engineering problems
- 1. 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
Correct Answer: all the above.
- 2. 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
Correct Answer: at an angle 30° to 60° to the direction of flow
- 3. 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. Discuss
Correct Answer: 4 hours
- 4. The minimum recommended diameter of sewers, is
Options- A. 5 cm
- B. 10 cm
- C. 15 cm
- D. 20 cm. Discuss
Correct Answer: 15 cm
- 5. 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
Correct Answer: All the above.
- 6. 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
Correct Answer: 0.45 m/sec
- 7. 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
Correct Answer: 0.25
- 8. 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
Correct Answer: 1.36 m
- 9. Chlorination of water is done for the removal of
Options- A. bacterias
- B. suspended solids
- C. sediments
- D. hardness. Discuss
Correct Answer: bacterias
- 10. The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
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