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- Question
For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
Options- A. H2SO4
- B. HNO3
- C. HCl
- D. none of these.
- Correct Answer
- H2SO4
- 1. A rain sanitary sewer is constructed to carry
Options- A. sanitary sewage
- B. storm sewage
- C. surface water
- D. ground water
- E. all the above. Discuss
- 2. When drainage to sewage ratio is 20, the peak dry weather flow is
Options- A. 20% of the design discharge
- B. slightly less than 5% of the design discharge
- C. slightly more than 5% of the design discharge
- D. none of these. Discuss
- 3. If D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
Options- A. D
- B. 1.25 D
- C. 1.5 D
- D. 1.75 D
- E. 2 D. Discuss
- 4. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
Options- A. cast iron sewers
- B. cement concrete sewers
- C. glazed bricks sewers
- D. stone ware sewers. Discuss
- 5. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
Options- A. 2.25
- B. 2.50
- C. 2.55
- D. 2.65
- E. 2.75 Discuss
- 6. The sewage is pumped up
Options- A. from low lying areas
- B. from flat areas
- C. from basements
- D. across a high ridge
- E. all the above. Discuss
- 7. The screens are fixed
Options- A. perpendicular to the direction of flow
- B. parallel to the direction of flow
- C. at an angle 30° to 60° to the direction of flow
- D. none of these. Discuss
- 8. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
Options- A. 2 hours
- B. 3 hours
- C. 4 hours
- D. 5 hours. Discuss
- 9. The minimum recommended diameter of sewers, is
Options- A. 5 cm
- B. 10 cm
- C. 15 cm
- D. 20 cm. Discuss
- 10. Aerobic bacterias
Options- A. flourish in the presence of free oxygen
- B. consume organic matter as their food
- C. oxidise organic matter in sewage
- D. All the above. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: sanitary sewage
Correct Answer: slightly less than 5% of the design discharge
Correct Answer: 1.5 D
Correct Answer: glazed bricks sewers
Correct Answer: 2.65
Correct Answer: all the above.
Correct Answer: at an angle 30° to 60° to the direction of flow
Correct Answer: 4 hours
Correct Answer: 15 cm
Correct Answer: All the above.
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