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- Question
The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula
the maximum run off is
Options- A. 0.10 cumec
- B. 0.12 cumec
- C. 0.15 cumec
- D. 0.20 cumec.
- Correct Answer
- 0.15 cumec
- 1. Nitrogen cycle of sewage, is
Options- A. Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
- B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates
- C. Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia
- D. Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates
- E. None of these. Discuss
- 2. A drop manhole is provided if
Options- A. a sewer drops from a height
- B. a branch sewer joins the main sewer at higher level
- C. a lamp is inserted to check obstruction
- D. none of these. Discuss
- 3. During preliminary treatment of a sewage
Options- A. Oil and grease are removed from skimming tanks
- B. Floating materials are removed by screening
- C. Girt and sand are removed by girt chambers
- D. All the above. Discuss
- 4. The clarigesters are
Options- A. circular septic tanks
- B. rectangular septic tanks
- C. circular Imhoff double tanks with bottom hoppers
- D. circular Imhoff double storey tanks without bottom hoppers. Discuss
- 5. The presence of free ammonia in sewage, is detected by
Options- A. boiling
- B. adding pottassium permanganate
- C. adding sulphuric acid
- D. phenol-di-sulphuric acid. Discuss
- 6. The recommended detention period for grit chambers is
Options- A. 1 minute
- B. 2 minutes
- C. 3 minutes
- D. 5 minutes. Discuss
- 7. The most dangerous pollutant in vehicular emissions is
Options- A. CO
- B. SO2
- C. CO2
- D. O3. Discuss
- 8. The gradient of sewers depends upon
Options- A. velocity of flow
- B. diameter of the sewer
- C. discharge
- D. all the above. Discuss
- 9. For design purposes, the normal rate of infiltration of ground water into the sewer, is
Options- A. 500 litres/km/cm
- B. 1000 litres/km/cm
- C. 1500 litres/km/cm
- D. 2000 litres/km/cm
- E. 2500 litres/km/cm. Discuss
- 10. Pick up the incorrect statement from the following :
Options- A. Septic tanks are horizontal continuous flow type of sedimentation tanks
- B. Septic tanks are generally provided a detention period of 12 to 36 hours
- C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
- D. Septic tanks are generally classified as tanks which work on the principle of anaerobic decomposition
- E. None of these. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen
Correct Answer: a branch sewer joins the main sewer at higher level
Correct Answer: All the above.
Correct Answer: circular Imhoff double storey tanks without bottom hoppers.
Correct Answer: boiling
Correct Answer: 1 minute
Correct Answer: CO
Correct Answer: all the above.
Correct Answer: 2000 litres/km/cm
Correct Answer: None of these.
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