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- Question
A nuisance is experienced in diluting water if dilution factor is less than
Options- A. 100
- B. 60
- C. 40
- D. 20
- E. 10
- Correct Answer
- 20
- 1. 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
- 2. 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
- 3. Imhoff cone is used to determine
Options- A. settlable solids
- B. suspended solids
- C. dissolved solids
- D. none of these. Discuss
- 4. 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
- 5. 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
- 6. Drop manholes at the junctions of sewer lines, are provided if
Options- A. invert level of a branch sewer is more than 60 cm that of the main sewer
- B. sewer line runs along a main road
- C. ordinary manhole cannot be built
- D. two sewer lines intersect. Discuss
- 7. In sewage, the solids in mg per litre is
Options- A. 100 to 500
- B. 500 to 1000
- C. 1000 to 1500
- D. 1500 to 2000 Discuss
- 8. In case of sewer lines
Options- A. water test is carried out to check water tightness of the joints
- B. test for straightness is carried out with the help of a lamp and mirror
- C. obstruction test is carried out with the. help of smooth ball of diameter 13 mm
- D. all the above. Discuss
- 9. Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated.
Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer.
Options- A. Both A and R are true and R is the correct explanation of A
- B. Both A and R are true but R is not a correct explanation of A
- C. A is true but R is false
- D. A is false but R is true. Discuss
- 10. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO. concentration was 5 mg/l. The BOD of raw sewerage is
Options- A. 100 mg/l
- B. 200 mg/l
- C. 300 mg/l
- D. 400 mg/l. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: The gases produced in sludge digestion process, contain 75% carbon dioxide
Correct Answer: anaerobic bacteria
Correct Answer: settlable solids
Correct Answer: All the above.
Correct Answer: half full
Correct Answer: invert level of a branch sewer is more than 60 cm that of the main sewer
Correct Answer: 500 to 1000
Correct Answer: all the above.
Correct Answer: Both A and R are true and R is the correct explanation of A
Correct Answer: 300 mg/l
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