Water Supply Engineering problems
- 1. The bed slope in slow sand filters, is generally kept
Options- A. 1 in 50
- B. 1 in 75
- C. 1 in 100
- D. 1 : 200 Discuss
Correct Answer: 1 in 100
- 2. In plain sedimentation tanks under normal conditions, impurities are removed upto
Options- A. 60%
- B. 70%
- C. 80%
- D. 90%. Discuss
Correct Answer: 70%
- 3. 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
Correct Answer: 66,500
- 4. 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
Correct Answer: both (a) and (c) of above.
- 5. 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
Correct Answer: Iron salts can be used over a limited range of pH values
- 6. 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
Correct Answer:
- 7. 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%. Discuss
Correct Answer: 98% to 99%.
- 8. De-chlorination is followed by
Options- A. post-chlorination
- B. pre-chlorination
- C. double-chlorination
- D. super-chlorination. Discuss
Correct Answer: super-chlorination.
- 9. 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
Correct Answer: 20 to 30 minutes
- 10. Underground water is obtained from
Options- A. rains
- B. rivers
- C. lakes
- D. reservoirs
- E. springs. Discuss
Correct Answer: springs.
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