Waste Water Engineering problems
- 1. The ratio of minimum hourly flow to the average flow of sewage is
Options- A. 1/4
- B. 1/3
- C. 1/2
- D. 3/4 Discuss
Correct Answer: 1/3
- 2. Dilution method of disposing off sewage, is not preferred to
Options- A. when sewage is fresh
- B. when diluting water has high dissolved oxygen content
- C. when diluting water is used for water supply near the point of sewage disposed
- D. when the diluting water is having flow currents
- E. none of these. Discuss
Correct Answer: when diluting water is used for water supply near the point of sewage disposed
- 3. An inverted siphon is designed generally for
Options- A. one pipe
- B. two pipes
- C. three pipes
- D. four pipes. Discuss
Correct Answer: three pipes
- 4. The non-clog pump which permits solid matter to pass out with the liquid sewage, is
Options- A. centrifugal pump
- B. reciprocating pump
- C. pneumatic ejector
- D. none of these. Discuss
Correct Answer: centrifugal pump
- 5. Pick up the in-correct statement from the following :
Options- A. Manholes are provided in sewer pipes at suitable intervals
- B. Catch basins are generally provided in sewers for carrying drainage discharge
- C. Inlets are generally provided in all sewers
- D. None of these. Discuss
Correct Answer: Inlets are generally provided in all sewers
- 6. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
Options- A. initial demand
- B. first stage demand
- C. carbonaceous demand
- D. all of these. Discuss
Correct Answer: all of these.
- 7. For treating the sewage of a large city, you will recommend
Options- A. a sedimentation tank and an activated sludge treatment plant
- B. a plant consisting of Imhoff tanks with low rate trickling filters
- C. sedimentation tanks with high rate trickling filters
- D. none of these. Discuss
Correct Answer: a sedimentation tank and an activated sludge treatment plant
- 8. A rainfall may be classified as acidic if its pH value is less or equal to
Options- A. 6
- B. 7
- C. 5
- D. 6.5 Discuss
Correct Answer: 5
- 9. Clogging of sewers, is caused due to
Options- A. silting
- B. low discharge
- C. greasy and oily matters
- D. domestic wastes thrown in manholes
- E. all the above. Discuss
Correct Answer: all the above.
- 10. Pick up the correct statement from the following :
Options- A. In treated sewage, 4 PPm of D.O. is essential
- B. Only very fresh sewage contains some dissolved oxygen
- C. The solubility of oxygen in sewage is 95% that is in distilled water
- D. All the above. Discuss
Correct Answer: All the above.
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