Waste Water Engineering problems
- 1. Fresh sewage may become stale in
Options- A. one hour
- B. two to three hours
- C. three to four hours
- D. six hours.
- E. ten hours. Discuss
Correct Answer: three to four hours
- 2. The liquid wastes from kitchens, bath rooms and wash basins, is not called
Options- A. liquid waste
- B. sullage
- C. sewage
- D. none of these. Discuss
Correct Answer: sewage
- 3. Rate of flow of sewage is generally assumed
Options- A. more than the rate of water supply
- B. equal to the rate of water supply
- C. less than the rate of water supply
- D. at 150 litres per capita. Discuss
Correct Answer: less than the rate of water supply
- 4. Which one of the following tests is used for testing sewer pipes :
Options- A. water test
- B. ball test
- C. mirror test
- D. all of these. Discuss
Correct Answer: all of these.
- 5. Hydraulic mean radius is
Options- A. mean radius of sewer
- B. difference in heads between two points in circular pipes
- C. mean of radii in a pipe line of varying cross-sections
- D. cross-sectional area/wetted perimeter. Discuss
Correct Answer: cross-sectional area/wetted perimeter.
- 6. A sewer running partially full and hurried with back filled, fails in compression due to
Options- A. weight of the pipe
- B. weight of the back fill
- C. superimposed traffic loads
- D. all the above. Discuss
Correct Answer: all the above.
- 7. In septic tanks,
Options- A. free board of 0.3 m may be provided
- B. the baffles or tees are extended up to top level of scum
- C. the clear space between the baffle top and covering slab is about 7.5 cm
- D. the inlet is kept 30 cm below the sewage line and outlet is kept at a level 40% depth of the sewage
- E. all the above. Discuss
Correct Answer: all the above.
- 8. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
Options- A. 0.50 m/sec
- B. 0.60 m/sec
- C. 0.70 m/sec
- D. 0.75 m/sec
- E. 1.0 m/sec. Discuss
Correct Answer: 0.75 m/sec
- 9. The sewer pipe which carries sewage from a building for immediate disposal is
Options- A. house sewer
- B. lateral sewer
- C. intercepting sewer
- D. main sewer. Discuss
Correct Answer: house sewer
- 10. A manhole is classified as shallow if its depth is between
Options- A. 0.4 to 0.5 m
- B. 0.5 to 0.7 m
- C. 0.7 to 0.9 m
- D. 0.9 to 1.20 m
- E. 1.2 to 1.50 m. Discuss
Correct Answer: 0.7 to 0.9 m
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