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- Question
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
Options- A. 15 days
- B. 30 days
- C. 60 days
- D. 90 days.
- Correct Answer
- 90 days.
- 1. Faculative bacterias survive in
Options- A. the presence of oxygen
- B. the absence of oxygen
- C. both cases (a) and (b)
- D. neither (a) nor (b). Discuss
- 2. The temperature affects the
Options- A. biological activity of bacterias in sewage
- B. solubility of gases in sewage
- C. viscosity of sewage
- D. all the above. Discuss
- 3. Pick up the incorrect statement from the following :
Options- A. The mixture of water and waste products, is called sewage
- B. The treated sewage effluents, are generally used for irrigating the crops
- C. The process of collecting, treating and disposing off the sewage, is called sewerage
- D. The old convergency system was definitely better than water carried sewerage system
- E. None of these. Discuss
- 4. For a continuous flow type of sedimentation tanks
Options- A. width of the tank is normally kept about 6 m
- B. length of the tank is normally kept 4 to 5 times the width
- C. maximum horizontal flow velocity is limited to 0.3 m/minute
- D. capacity of the tank for 24 hours, is kept equal to maximum daily flow of sewage
- E. all the above. Discuss
- 5. The spacing of bars for perforations in coarse screens used for the treatment of sewage, is
Options- A. 20 mm
- B. 30 mm
- C. 40 mm
- D. 50 mm
- E. 100 mm. Discuss
- 6. In a trickling filter
Options- A. filtration process is used
- B. biological action is used
- C. neither (a) nor (b)
- D. both (a) and (b). Discuss
- 7. Setting out the alignments of sewers may start from
Options- A. city
- B. out-fall
- C. tail end
- D. any point. Discuss
- 8. The normal value of over flow rates for plain primary sedimentation tanks, ranges between
Options- A. 25, 000 to 35, 000 litres/sqm/day
- B. 40, 000 to 50, 000 litres/sqm/day
- C. 50, 000 to 60, 000 litres/sqm/day
- D. 80, 000 to 100, 000 litres/sqm/day
- E. none of these. Discuss
- 9. The asbestos cement sewers are
Options- A. light in weight
- B. not structurally strong to bear large compressive stress
- C. susceptible to corrosion by sulphuric acid
- D. All the above. Discuss
- 10. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known
Options- A. house sewer
- B. lateral sewer
- C. branch sewer
- D. sewer outfall. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: both cases (a) and (b)
Correct Answer: all the above.
Correct Answer: The old convergency system was definitely better than water carried sewerage system
Correct Answer: all the above.
Correct Answer: 50 mm
Correct Answer: biological action is used
Correct Answer: tail end
Correct Answer: 40, 000 to 50, 000 litres/sqm/day
Correct Answer: All the above.
Correct Answer: sewer outfall.
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