Waste Water Engineering problems
- 1. 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. Discuss
Correct Answer: 90 days.
- 2. 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
Correct Answer: biological action is used
- 3. Setting out the alignments of sewers may start from
Options- A. city
- B. out-fall
- C. tail end
- D. any point. Discuss
Correct Answer: tail end
- 4. 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
Correct Answer: 40, 000 to 50, 000 litres/sqm/day
- 5. 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
Correct Answer: All the above.
- 6. 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
Correct Answer: sewer outfall.
- 7. Pick up the correct statement from the following :
Options- A. Small sewers are cleaned by flushing
- B. Medium sewers are cleaned by cane rodding
- C. Medium sewers may be cleaned by pills
- D. Large sewers are cleaned by removing the deposited materials
- E. All the above. Discuss
Correct Answer: All the above.
- 8. The pressure exerted by
Options- A. the sewage when running full from inside, is called internal pressure
- B. the internal pressure if any, causes tensile stress in the pipe material
- C. pressure sewers are designed to be safe in tension
- D. All the above. Discuss
Correct Answer: All the above.
- 9. Pick up the correct statement from the following :
Options- A. the sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
- B. the sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
- C. the minimum design velocity of sewer pipes is taken as 0.8 m/sec
- D. all the above. Discuss
Correct Answer: all the above.
- 10. Pick up the incorrect size of stone ware sewers
Options- A. 52.5 cm
- B. 67.5 cm
- C. 82.5 cm
- D. 90 cm
- E. none of these. Discuss
Correct Answer: none of these.
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