Water Supply Engineering problems
- 1. Rapid gravity filters can remove bacterial impurities up to a maximum of
Options- A. 50%
- B. 60%
- C. 70%
- D. 80%
- E. 90%. Discuss
Correct Answer: 80%
- 2. m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by
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
Correct Answer: velocity area method
- 3. 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
Correct Answer: All the above.
- 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
Correct Answer: velocity area method
- 5. 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
Correct Answer: 30 to 35
- 6. 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
Correct Answer: yellowish
- 7. 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
Correct Answer: plain chlorination
- 8. For controlling algae, the most commonly used chemical, is
Options- A. copper sulphate
- B. alum
- C. lime
- D. bleaching powder. Discuss
Correct Answer: copper sulphate
- 9. 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
Correct Answer: in rivers
- 10. 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
Correct Answer: 12 mm
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