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- Question
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
Options- A. 50 mg/l
- B. 100 mg/l
- C. 150 mg/l
- D. 200 mg/l
- E. 250 mg/l.
- Correct Answer
- 250 mg/l.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. It is customary to design a sewer for D.W.F. on the basis of
Options- A. average demand
- B. twice the average demand
- C. thrice the average demand
- D. four times the average demand. Discuss
- 7. The detention period for plain sedimentation water tanks, is usually
Options- A. 4 to 8 hours
- B. 8 to 16 hours
- C. 16 to 24 hours
- D. 24 to 36 hours. Discuss
- 8. Sewer ventilating columns are generally placed at
Options- A. distances 150 m to 300 m
- B. upper ends of branch sewers
- C. every change in the size of sewers
- D. all the above. Discuss
- 9. In case of Imhoff tanks,
Options- A. the shape is rectangular
- B. detention period is 2 hours
- C. the velocity of flow is restricted to 0.30 m/minute
- D. surface loading is limited to 30, 000 litres/m of plan area per day
- E. All the above. Discuss
- 10. Pick up the correct statement from the following :
Options- A. The materials separated by screens, is called screenings
- B. The screenings are disposed off either by burning or by burial or by dumping
- C. The process of burning the screenings, is called incineration
- D. The process of burning the screenings, is known as compositing
- E. All the above. Discuss
Waste Water Engineering problems
Search Results
Correct Answer: 0.7 to 0.9 m
Correct Answer: house sewer
Correct Answer: 0.75 m/sec
Correct Answer: all the above.
Correct Answer: all the above.
Correct Answer: thrice the average demand
Correct Answer: 4 to 8 hours
Correct Answer: all the above.
Correct Answer: All the above.
Correct Answer: All the above.
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