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- Question
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.
- Correct Answer
- The gases produced in sludge digestion process, contain 75% carbon dioxide
- 1. 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
- 2. Imhoff cone is used to determine
Options- A. settlable solids
- B. suspended solids
- C. dissolved solids
- D. none of these. Discuss
- 3. 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
- 4. 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
- 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
- 6. A nuisance is experienced in diluting water if dilution factor is less than
Options- A. 100
- B. 60
- C. 40
- D. 20
- E. 10 Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Waste Water Engineering problems
Search Results
Correct Answer: anaerobic bacteria
Correct Answer: settlable solids
Correct Answer: All the above.
Correct Answer: half full
Correct Answer: 0.013
Correct Answer: 20
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
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