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- Question
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by pottassium dichromate in the presence of
Options- A. Hydrochloric acid
- B. Sulphuric acid
- C. Nitric acid
- D. Citric acid.
- Correct Answer
- Sulphuric acid
- 1. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
Options- A. Carbondioxide gas
- B. Hydrogen sulphide gas
- C. Methane gas
- D. Petrol vapours. Discuss
- 2. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
Options- A. Hydrogen sulphide
- B. Carbon dioxide
- C. Methane
- D. Oxygen
- E. None of these. Discuss
- 3. The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
Options- A. inverted syphon
- B. depressed sewer
- C. sag pipe
- D. all of these. Discuss
- 4. 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
- 5. 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
- 6. In detritus tanks,
Options- A. flow velocity is kept 0.09 m/sec
- B. detention period is kept 3 to 4 minutes
- C. organic and inorganic materials are separated
- D. all the above. Discuss
- 7. Assertion (A) : The determination of pH value of sewerage is important.
Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value.
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
- 8. With self cleansing velocity in sewers
Options- A. silting occurs at bottom
- B. scouring occurs at bottom
- C. both silting and scouring occur at bottom
- D. neither silting nor scouring occurs at bottom. Discuss
- 9. Stone ware pipes are
Options- A. highly resistant to sulphide corrosion
- B. highly impervious
- C. hydraulically efficient because of their smooth interior surface
- D. specially suited to pressure pipes
- E. none of these. Discuss
- 10. If ?w is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is
Options- A. ?w . r . S
- B. ?w r1/2 . S
- C. ?w r S
- D. ?w r2/3 S Discuss
Waste Water Engineering problems
Search Results
Correct Answer: Methane gas
Correct Answer: Hydrogen sulphide
Correct Answer: all of these.
Correct Answer: 300 mg/l
Correct Answer: Both A and R are true and R is the correct explanation of A
Correct Answer: all the above.
Correct Answer: Both A and R are true and R is the correct explanation of A
Correct Answer: neither silting nor scouring occurs at bottom.
Correct Answer: specially suited to pressure pipes
Correct Answer: ?w . r . S
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