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- Question
For controlling algae, the most commonly used chemical, is
Options- A. copper sulphate
- B. alum
- C. lime
- D. bleaching powder.
- Correct Answer
- copper sulphate
- 1. Raw water treated with only chlorine, is known as
Options- A. plain chlorination
- B. pre-chlorination
- C. first-chlorination
- D. de-chlorination
- E. none of these. Discuss
- 2. By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution
Options- A. yellowish
- B. greenish
- C. bluish
- D. reddish
- E. violet. Discuss
- 3. The percentage of chlorine in fresh bleaching powder is roughly
Options- A. 50 to 60
- B. 30 to 35
- C. 40 to 50
- D. 20 to 25 Discuss
- 4. Most important method for calculating discharge for planning a water supply project, is
Options- A. velocity area method
- B. weir or spillway method
- C. use of venturi-meter
- D. using power plant consumption
- E. none of these. Discuss
- 5. Pick up the incorrect statement from the following :
Options- A. The water entering the slow sand filters should be treated by 9.386 coagulants
- B. The depth of water on the filter should be twice the depth of the filter sand
- C. When the filter head is 0.75 times the depth of filter sand, the water obtained is purest
- D. The cleaning of slow sand filters is done by back washing
- E. All the above. Discuss
- 6. Run off is the quantity of water which flows
Options- A. in sewer pipes
- B. due to leakage in pipes
- C. in rivers
- D. none of these. Discuss
- 7. The diameter of pipes in bath rooms and lavatories in domestic water supply, is
Options- A. 6 mm
- B. 12 mm
- C. 18 mm
- D. 24 mm. Discuss
- 8. 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
- 9. In plain sedimentation tanks under normal conditions, impurities are removed upto
Options- A. 60%
- B. 70%
- C. 80%
- D. 90%. Discuss
- 10. 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
Water Supply Engineering problems
Search Results
Correct Answer: plain chlorination
Correct Answer: yellowish
Correct Answer: 30 to 35
Correct Answer: velocity area method
Correct Answer: All the above.
Correct Answer: in rivers
Correct Answer: 12 mm
Correct Answer: 1 in 100
Correct Answer: 70%
Correct Answer: 66,500
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