Waste Water Engineering problems
- 1. The normal values of over flow rates for secondary sedimentation tanks, ranges between
Options- A. 25, 000 to 35, 000 litres/sqm/day
- B. 40, 000 to 50, 000 litres/sqm/day
- C. 50, 000 to 60, 000 litres/sqm/day
- D. 80, 000 to 10, 000 litres/sqm/day
- E. none of these. Discuss
Correct Answer: 25, 000 to 35, 000 litres/sqm/day
- 2. If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is
Options- A. 50 ppm
- B. 100 ppm
- C. 150 ppm
- D. 200 ppm
- E. 250 ppm. Discuss
Correct Answer: 200 ppm
- 3. The following is the physical characteristic of sewage
Options- A. turbidity
- B. colour
- C. odour
- D. temperature
- E. all the above. Discuss
Correct Answer: all the above.
- 4. Pick up the correct statement from the following :
Options- A. Maximum daily flow = 2 times the average daily flow
- B. Maximum daily flow =
x average daily flow - C. Sewers are designed for minimum permissible velocity at minimum flow
- D. All the above. Discuss
Correct Answer: All the above.
- 5. The underground sewers are more subjected to
Options- A. tensile force
- B. compressive force
- C. bending force
- D. shearing force. Discuss
Correct Answer: compressive force
- 6. Pick up the correct statement from the following :
Options- A. Hydrogen sulphide gas in excess, may cause corrosion of concrete sewers
- B. 4 ppm of Dissolved Oxygen (D.O.) is ensured before discharging the treated sewage in river
- C. Solubility of oxygen in sewage is 95% of that of distilled water
- D. Dissolved oxygen content of sewage, may be determined by Winkler's method
- E. All the above. Discuss
Correct Answer: All the above.
- 7. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope
Options- A. 1 in 5
- B. 1 in 10
- C. 1 in 15
- D. 1 in 20
- E. 1 in 25 Discuss
Correct Answer: 1 in 10
- 8. For drainage pipes in buildings the test applied before putting them to use, is
Options- A. water test
- B. smoke test
- C. straightness test
- D. all the above. Discuss
Correct Answer: smoke test
- 9. In normal conditions, the period for sludge digestion, is
Options- A. 10 days
- B. 20 days
- C. 30 days
- D. 60 days
- E. 90 days. Discuss
Correct Answer: 30 days
- 10. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is
Options- A. 1.5
- B. 2.0
- C. 3.0
- D. 4.0 Discuss
Correct Answer: 1.5
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