Waste Water Engineering problems
- 1. For design of sewers, percentage of sewage discharge is assumed
Options- A. 65 to 70%
- B. 70 to 75%
- C. 75 to 80%
- D. 85%. Discuss
Correct Answer: 75 to 80%
- 2. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
Options- A. 10 cm
- B. 12 cm
- C. 15 cm
- D. 18 cm
- E. 20 cm. Discuss
Correct Answer: 15 cm
- 3. A circular sewer section is preferred to because
Options- A. it is cheaper in construction
- B. it provides maximum area for a given perimeter
- C. it provides maximum hydraulic mean depth
- D. all the above. Discuss
Correct Answer: all the above.
- 4. The sewer which transports the sewage to the point of treatment, is called
Options- A. house sewer
- B. out-fall sewer
- C. branch sewer
- D. lateral
- E. main sewer. Discuss
Correct Answer: out-fall sewer
- 5. The porosity of sediments in sewer pipes, is usually taken as
Options- A. 0.010
- B. 0.011
- C. 0.012
- D. 0.013
- E. 0.020 Discuss
Correct Answer: 0.013
- 6. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at
Options- A. full depth
- B. half full
- C. two third full
- D. three fourth full. Discuss
Correct Answer: half full
- 7. Pick up the correct statement from the following :
Options- A. The boning rod is used for checking the levels of the sewer inverts
- B. Manhole covers are made circular for the convenience of the cleaning staff
- C. A manhole is classified as deep manhole if its depth is more than 1.5 m
- D. A manhole is classified as shallow manhole if its depth is. less than 0.9 m
- E. All the above. Discuss
Correct Answer: All the above.
- 8. Imhoff cone is used to determine
Options- A. settlable solids
- B. suspended solids
- C. dissolved solids
- D. none of these. Discuss
Correct Answer: settlable solids
- 9. In septic tanks, decomposition of organic bacteria, is done by
Options- A. anaerobic bacteria
- B. aerobic bacteria
- C. both types of bacterias
- D. none of these. Discuss
Correct Answer: anaerobic bacteria
- 10. Pick up the incorrect statement from the following :
Options- A. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion
- B. Sludge digestion is carried out in sludge tank
- C. The gases produced in sludge digestion process, contain 75% carbon dioxide
- D. The gases produced in sludge digestion process, contain 75% methane. Discuss
Correct Answer: The gases produced in sludge digestion process, contain 75% carbon dioxide
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