Discussion
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- Question
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is
Options- A. 100 mg/l
- B. 200 mg/l
- C. 300 mg/l
- D. 400 mg/l.
- Correct Answer
- 400 mg/l.
- 1. The most efficient cross section of sewers in a separate sewerage system is
Options- A. parabolic
- B. circular
- C. rectangular
- D. new egged. Discuss
- 2. The formula
used for determining flow velocities in sewers, is known as
Options- A. Chezy's formula
- B. Bazin's formula
- C. Kutter's formula
- D. Manning's formula. Discuss
- 3. The rate of accumulation of sludge per person per year, is
Options- A. 10 litres
- B. 15 litres
- C. 20 litres
- D. 25 litres
- E. 30 litres. Discuss
- 4. The intensity of rain is expressed in
Options- A. cm/minute
- B. cm/hour
- C. cm/day
- D. none of these. Discuss
- 5. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is
Options- A. separate system
- B. combined system
- C. partially combined system
- D. none of these. Discuss
- 6. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning's formula, is given by
Options- A. Bazin
- B. Crimp and Bruge
- C. William-Hazen
- D. Kutter. Discuss
- 7. Pick up the incorrect statement from the following for allowing workers to enter sewers
Options- A. The particular manhole and one manhole on up stream and one manhole on down stream should remain open for 30 minutes
- B. Proper tests for the presence of poisonous gases must be carried out
- C. The men entering the manhole should be advised to smoke in the sewer
- D. Warning signals should be erected
- E. None of these. Discuss
- 8. In a grit chamber of a sewage treatment plant,
Options- A. flow velocity 0.15 m to 0.3 m/sec is kept
- B. depth of 0.9 m to 1.20 m is kept
- C. one minute of detention period is kept
- D. all the above. Discuss
- 9. The quantity of liquid waste which flows in sewers during the period of rainfall, is known
Options- A. sanitary sewage
- B. industrial waste
- C. storm sewage
- D. none of these. Discuss
- 10. For detecting the nitrates in sewage, the colour may be developed by adding
Options- A. Pottassium permanganate
- B. Sulphuric acid and napthamine
- C. Phenol-di-sulphuric acid and pottassium hydroxide
- D. None of these. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: circular
Correct Answer: Manning's formula.
Correct Answer: 20 litres
Correct Answer: cm/hour
Correct Answer: combined system
Correct Answer: Crimp and Bruge
Correct Answer: The men entering the manhole should be advised to smoke in the sewer
Correct Answer: all the above.
Correct Answer: storm sewage
Correct Answer: Phenol-di-sulphuric acid and pottassium hydroxide
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