Discussion
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- Question
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is
Options- A. 1 in 60
- B. 1 in 100
- C. 1 in 120
- D. none of these.
- Correct Answer
- 1 in 60
- 1. Oxidation process results in the formation of
Options- A. carbon dioxide
- B. nitrates
- C. sulphates
- D. all the above. Discuss
- 2. Before discharging the foul sewage into rivers, it is generally treated by
Options- A. screening
- B. sedimentation
- C. oxidation
- D. sludge digestion and disinfection
- E. all the above. Discuss
- 3. Boussinesq's equation for ascertaining unit pressure at a depth H on sewers due to traffic loads, is
Options- A.
- B.
- C.
- D.
- E. none of these. Discuss
- 4. D is the diameter of a circular sewer and ? is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is
Options- A. ?D8/3 = 4 b8/3
- B. ?D3/8 = 4 b3/8
- C. ?D2/3 = 4 b2/3
- D. ?D3/2 = 4 b3/2
- E. none of these. Discuss
- 5. The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is
Options- A. 5 m
- B. 5.5 m
- C. 6 m
- D. 6.5 m
- E. 7 m. Discuss
- 6. As compared to fresh river water, sea water contains oxygen
Options- A. 10% less
- B. 20% less
- C. 10% more
- D. 20% more. Discuss
- 7. Which one of the following resists hydrogen sulphide corrosion
Options- A. R.C.C.
- B. Glazed stone wares
- C. Asbestos cement
- D. Glazed ware. Discuss
- 8. Dry weather flow is :
Options- A. average daily rate of flow
- B. average monthly rate of flow
- C. average annual rate of flow
- D. water supply allowance per capita
- E. none of these. Discuss
- 9. In 1000 kg of sewage, the total solids approximate
Options- A. 0.5 to 1.0 kg
- B. 1 kg to 2.0 kg
- C. 5 kg to 7.5 kg
- D. 7.5 kg to 10 kg. Discuss
- 10. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
Options- A. degradation
- B. active decomposition
- C. recovery
- D. cleaner water
- E. none of these. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: all the above.
Correct Answer: all the above.
Correct Answer:
Correct Answer: ?D8/3 = 4 b8/3
Correct Answer: 7 m.
Correct Answer: 20% less
Correct Answer: Glazed ware.
Correct Answer: water supply allowance per capita
Correct Answer: 0.5 to 1.0 kg
Correct Answer: active decomposition
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