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- Question
Bottom openings 15 cm x 15 cm in the standing baffle wall are provided
Options- A. 15 cm c/c
- B. 22.5 cm c/c
- C. 30 cm c/c
- D. 50 cm c/c.
- Correct Answer
- 22.5 cm c/c
- 1. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is
Options- A. 1.39 m
- B. 1.49 m
- C. 1.59 m
- D. 1.69 m
- E. 1.79 m. Discuss
- 2. A manhole is generally provided at each
Options- A. bend
- B. junction
- C. change of gradient
- D. change of sewer diameter
- E. all the above. Discuss
- 3. For having central angle ?, the area of cross-section of sewers running partially full, is
Options- A.
- B.
- C.
- D.
Discuss
- 4. If the pH value of sewage is 7
Options- A. it is acidic
- B. it is alkaline
- C. it is neutral
- D. none of these. Discuss
- 5. For sewers, inverted siphon is provided for
Options- A. one pipe
- B. two pipes
- C. three pipes
- D. four pipes. Discuss
- 6. The sewer pipes
Options- A. carry sewage as gravity conduits
- B. are designed for generating self-cleansing velocities at different discharge
- C. should resist the wear and tear caused due to abrasion
- D. all the above. Discuss
- 7. To maintain aerobic biological activity, the moisture content of the compost mass should be about
Options- A. 45%
- B. 50%
- C. 55%
- D. 60%. Discuss
- 8. In very first stage of decomposition of the organic matter in sewage
Options- A. nitrites are formed
- B. nitrates are formed
- C. carbondioxide is formed
- D. ammonia is formed. Discuss
- 9. 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
- 10. 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
Waste Water Engineering problems
Search Results
Correct Answer: 1.69 m
Correct Answer: all the above.
Correct Answer:
Correct Answer: it is neutral
Correct Answer: three pipes
Correct Answer: all the above.
Correct Answer: 55%
Correct Answer: ammonia is formed.
Correct Answer: 25, 000 to 35, 000 litres/sqm/day
Correct Answer: 200 ppm
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