Discussion
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- Question
Removal of oil and grease from sewage, is known
Options- A. screening
- B. skimming
- C. filtration
- D. none of these.
- Correct Answer
- skimming
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Self-cleansing velocity is
Options- A. velocity at dry weather flow
- B. velocity of water at flushing
- C. velocity at which no accumulation remains in the drains
- D. velocity of water in a pressure filter. Discuss
- 7. Flocculated particles do not change their
Options- A. size
- B. shape
- C. weight
- D. none of these. Discuss
- 8. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is
Options- A. 1045 mm
- B. 1065 mm
- C. 1075 mm
- D. 1095 mm. Discuss
- 9. Disposal to sewage in large cities, is done in
Options- A. irrigation
- B. dilution
- C. oxidation
- D. putrifaction. Discuss
- 10. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
Options- A. 1.5
- B. 2.0
- C. 3.0
- D. 4.0 Discuss
Waste Water Engineering problems
Search Results
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: 5
Correct Answer: a sedimentation tank and an activated sludge treatment plant
Correct Answer: all of these.
Correct Answer: velocity at which no accumulation remains in the drains
Correct Answer: none of these.
Correct Answer: 1095 mm.
Correct Answer: dilution
Correct Answer: 2.0
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