Discussion
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- Question
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is
Options- A.
- B.
- C.
- D. ?D.
- Correct Answer
-
- 1. The use of coarse screens for the disposal of sewage, may be dispensed with by
Options- A. comminutor
- B. shredder
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
- 2. The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
Options- A. 25%
- B. 50%
- C. 10%
- D. 5%. Discuss
- 3. The first stage of neutral process of sludge digestion, is
Options- A. acid fermentation
- B. acid regression
- C. alkaline fermentation
- D. none of these. Discuss
- 4. The average temperature of sewage in India, is
Options- A. 10°C
- B. 15°C
- C. 20°C
- D. 25°C
- E. 30°C. Discuss
- 5. PH value of sludge during alkaline regression stage, is
Options- A. more than 7
- B. less than 7
- C. less than 6
- D. more than 6. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. The pH value of sewage is determined with the help of
Options- A. Imhoff Cone
- B. turbidimeter
- C. potentiometer
- D. none of these. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: both (a) and (b)
Correct Answer: 50%
Correct Answer: acid fermentation
Correct Answer: 20°C
Correct Answer: more than 7
Correct Answer: 300 m
Correct Answer: The water supply pipes carry pure water free from solid particles
Correct Answer: 60 to 80%
Correct Answer: large suspended organic solids
Correct Answer: potentiometer
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