Waste Water Engineering problems
- 1. For large sewers, maximum distance between manholes may be
Options- A. 50 m
- B. 100 m
- C. 200 m
- D. 300 m
- E. 400 m. Discuss
Correct Answer: 300 m
- 2. Pick up the correct statement from the following :
Options- A. The water supply pipes carry pure water free from solid particles
- B. The water supply pipes get clogged if flow velocity is less than self cleansing velocity
- C. The sewers may be carried up and down the hills and valleys
- D. The sewer pipes are generally laid along level hills
- E. None of these. Discuss
Correct Answer: The water supply pipes carry pure water free from solid particles
- 3. In trickling filter, B.O.D. is reduced to
Options- A. 30 to 40%
- B. 40 to 60%
- C. 60 to 80%
- D. 80 to 90%
- E. 95%. Discuss
Correct Answer: 60 to 80%
- 4. Primary treatment of sewage consists of removal of
Options- A. large suspended organic solids
- B. oil and grease
- C. sand and girt
- D. floating materials
- E. none of these. Discuss
Correct Answer: large suspended organic solids
- 5. The pH value of sewage is determined with the help of
Options- A. Imhoff Cone
- B. turbidimeter
- C. potentiometer
- D. none of these. Discuss
Correct Answer: potentiometer
- 6. Stoneware sewers are available in size
Options- A. 10 cm
- B. 15 cm
- C. 20 cm
- D. 25 cm
- E. all the above. Discuss
Correct Answer: all the above.
- 7. Inter-distance between ventilation columns in a sewer line is kept
Options- A. 25 to 50 m
- B. 50 m to 100 m
- C. 100 m to 150 m
- D. 150 m to 300 m. Discuss
Correct Answer: 150 m to 300 m.
- 8. Ventilating shafts are provided to a sewer line at every
Options- A. 100 m
- B. 150 m
- C. 200 m
- D. 300 m
- E. 500 m. Discuss
Correct Answer: 300 m
- 9. For the open drain (N = 0.025) shown in the below figure, the discharge is
Options- A. 26.88 cumecs
- B. 27.88 cumecs
- C. 28.88 cumecs
- D. 29.88 cumecs. Discuss
Correct Answer: 28.88 cumecs
- 10. The sewer which resists sulphide corrosion, is
Options- A. Brick sewer
- B. Cast iron sewer
- C. R.C.C. sewer
- D. Lead sewer
- E. None of these. Discuss
Correct Answer: Lead sewer
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