Waste Water Engineering problems
- 1. The spacing of bars of perforations of fine screens used for the treatment of sewage, is
Options- A. 2 to 3 mm
- B. 3 to 5 mm
- C. 5 to 8 mm
- D. 8 to 10 mm. Discuss
Correct Answer: 2 to 3 mm
- 2. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
Options- A. unexpected large scale infiltration of stream water
- B. unexpected increase in the population
- C. under estimates of maximum and average flows
- D. All of the above. Discuss
Correct Answer: All of the above.
- 3. The water carried sewerage system removes
Options- A. domestic sewage
- B. industrial sewage
- C. storm sewage
- D. all the above. Discuss
Correct Answer: all the above.
- 4. The design period in years for pumping plants, is
Options- A. 1
- B. 2 to 3
- C. 3 to 5
- D. 5 to 10 Discuss
Correct Answer: 5 to 10
- 5. The Chezy's constant C in the formula V = C rs depends upon
Options- A. size of the sewer
- B. shape of the sewer
- C. roughness of sewer surface
- D. hydraulic characteristics of sewer
- E. all the above. Discuss
Correct Answer: all the above.
- 6. Water content of sewage is about
Options- A. 90%
- B. 95%
- C. 99%
- D. 9.9%. Discuss
Correct Answer: 9.9%.
- 7. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed
Options- A. 1.5
- B. 2.0
- C. 2.5
- D. 3.0
- E. 3.5 Discuss
Correct Answer: 1.5
- 8. Afive day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is
Options- A. 100
- B. 1000
- C. 5000
- D. 10000 Discuss
Correct Answer: 10000
- 9. If the peak discharge of a storm water drain (S.W. Drain) is e.xpected to exceed 150 cumecs, the free board to be provided, is
Options- A. 100 cm
- B. 90 cm
- C. 80 cm
- D. 50 cm. Discuss
Correct Answer: 100 cm
- 10. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
Options- A. 16 m
- B. 20 m
- C. 24 m
- D. 30 m. Discuss
Correct Answer: 24 m
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