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- Question
Efficiency of removing bacterias from raw water by a slow sand filter, is
Options- A. 80% to 81%
- B. 85% to 86%
- C. 90% to 97%
- D. 98% to 99%.
- Correct Answer
- 98% to 99%.
- 1. S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is
Options- A.
- B.
- C.
- D.
Discuss
- 2. Pick up the incorrect statement from the following :
Options- A. Iron salts produce heavy flocs and hence remove more suspended matter
- B. Iron salts remove hydrogen sulphides
- C. Iron salts can be used over a limited range of pH values
- D. Iron salts impart corrosiveness to water. Discuss
- 3. Air inlet valve in water mains, is generally provided at
Options- A. summit of the pipe
- B. upstream of sluice valve
- C. down stream of sluice valve
- D. valley of the pipe
- E. both (a) and (c) of above. Discuss
- 4. The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be
Options- A. 55,000
- B. 60,500
- C. 66,500
- D. 72,500
- E. 76,500 Discuss
- 5. In plain sedimentation tanks under normal conditions, impurities are removed upto
Options- A. 60%
- B. 70%
- C. 80%
- D. 90%. Discuss
- 6. De-chlorination is followed by
Options- A. post-chlorination
- B. pre-chlorination
- C. double-chlorination
- D. super-chlorination. Discuss
- 7. The duration of contact of chlorine with water before it is served to the first consumer, should be at least
Options- A. 10 to 15 minutes
- B. 15 to 20 minutes
- C. 20 to 30 minutes
- D. 30 to 40 minutes
- E. one hour. Discuss
- 8. Underground water is obtained from
Options- A. rains
- B. rivers
- C. lakes
- D. reservoirs
- E. springs. Discuss
- 9. Pick up the correct statement from the following :
Options- A. The pH value of neutral water is 7
- B. The maximum acidity is obtained when pH value is zero
- C. The maximum alkalinity is obtained when pH value is 14.
- D. All the above. Discuss
- 10. Cast iron pipes
Options- A. are widely used in city water supplies
- B. resist corrosion satisfactorily
- C. may last for 100 years
- D. are normally manufactured in lengths of about 3.5 m
- E. all the above. Discuss
Water Supply Engineering problems
Search Results
Correct Answer:
Correct Answer: Iron salts can be used over a limited range of pH values
Correct Answer: both (a) and (c) of above.
Correct Answer: 66,500
Correct Answer: 70%
Correct Answer: super-chlorination.
Correct Answer: 20 to 30 minutes
Correct Answer: springs.
Correct Answer: All the above.
Correct Answer: all the above.
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