Waste Water Engineering problems
- 1. 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
Correct Answer: all the above.
- 2. Oxidation process results in the formation of
Options- A. carbon dioxide
- B. nitrates
- C. sulphates
- D. all the above. Discuss
Correct Answer: all the above.
- 3. 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. Discuss
Correct Answer: 1 in 60
- 4. As compared to fresh river water, sea water contains oxygen
Options- A. 10% less
- B. 20% less
- C. 10% more
- D. 20% more. Discuss
Correct Answer: 20% less
- 5. 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
Correct Answer: Glazed ware.
- 6. 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
Correct Answer: water supply allowance per capita
- 7. 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
Correct Answer: 0.5 to 1.0 kg
- 8. 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
Correct Answer: active decomposition
- 9. In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 10. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is
Options- A. 213.5 cm/sec
- B. 313.5 cm/sec
- C. 413.5 cm/sec
- D. 500 cm/sec. Discuss
Correct Answer: 313.5 cm/sec
More in Civil Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.