Discussion
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- Question
At the junction of sewers
Options- A. top of smaller sewer is kept lower
- B. top of larger sewer is kept lower
- C. tops of both the sewers are at the same level
- D. none of these.
- Correct Answer
- none of these.
- 1. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
Options- A. 16 m
- B. 20 m
- C. 24 m
- D. 30 m. Discuss
- 2. If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is
Options- A. 100 cm
- B. 90 cm
- C. 80 cm
- D. 50 cm. Discuss
- 3. Afive day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
Options- A. 100
- B. 1000
- C. 5000
- D. 10000 Discuss
- 4. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed
Options- A. 1.5
- B. 2.0
- C. 2.5
- D. 3.0
- E. 3.5 Discuss
- 5. Water content of sewage is about
Options- A. 90%
- B. 95%
- C. 99%
- D. 9.9%. Discuss
- 6. The pH value of fresh sewage is usually
Options- A. equal to 7
- B. more than 7
- C. less than 7
- D. equal to zero. Discuss
- 7. Depletion of ozone layer in the outer atmosphere may cause
Options- A. lung cancer
- B. skin cancer
- C. bronchitis
- D. heart disorder. Discuss
- 8. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
Options- A. 0.05552 cumec
- B. 0.05554 cumec
- C. 0.05556 cumec
- D. 0.0556 cumec
- E. 0.0558 cumec. Discuss
- 9. Sluge banks are formed if sewage is disposed of in
Options- A. rivers
- B. seas
- C. lakes
- D. none of these. Discuss
- 10. Lead acetate test in sewer manhole is done to test the presence of
Options- A. Methane gas
- B. Hydrogen sulphide
- C. Carbondioxide gas
- D. Diesel vapours. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: 24 m
Correct Answer: 100 cm
Correct Answer: 10000
Correct Answer: 1.5
Correct Answer: 9.9%.
Correct Answer: more than 7
Correct Answer: skin cancer
Correct Answer: 0.05556 cumec
Correct Answer: seas
Correct Answer: Hydrogen sulphide
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