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- Question
Underground water is obtained from
Options- A. rains
- B. rivers
- C. lakes
- D. reservoirs
- E. springs.
- Correct Answer
- springs.
- 1. 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
- 2. De-chlorination is followed by
Options- A. post-chlorination
- B. pre-chlorination
- C. double-chlorination
- D. super-chlorination. Discuss
- 3. 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
- 4. 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
- 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
- 6. 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
- 7. 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
- 8. The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept
Options- A. at the level of water of the source
- B. at the bottom of water of the source
- C. at about 2.5 m above the bottom
- D. none of these. Discuss
- 9. Plain chlorination is used for water
Options- A. with turbidities less than 20 mg/litre
- B. obtained from clear lakes
- C. consumed during emergencies
- D. supplies to armies during war
- E. all the above. Discuss
- 10. P.V.C. pipes can withstand pressure bead of water upto
Options- A. 25 m
- B. 50 m
- C. 75 m
- D. 100 m
- E. 125 m. Discuss
Water Supply Engineering problems
Search Results
Correct Answer: 20 to 30 minutes
Correct Answer: super-chlorination.
Correct Answer: 98% to 99%.
Correct Answer:
Correct Answer: Iron salts can be used over a limited range of pH values
Correct Answer: All the above.
Correct Answer: all the above.
Correct Answer: at about 2.5 m above the bottom
Correct Answer: all the above.
Correct Answer: 100 m
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