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- Question
Mud balls may be removed by
Options- A. breaking and washing
- B. washing the filter with a solution of caustic soda
- C. removing, cleaning and replacing the damaged sand
- D. all the above.
- Correct Answer
- all the above.
- 1. The lowest outlet sluice in a dam is provided
Options- A. below the dead storage
- B. on the top level of dead storage
- C. on the top level of useful storage
- D. at the centre of the dam. Discuss
- 2. Sluice valves are fitted in a distribution system
Options- A. along straight length of pipes at suitable intervals
- B. at the junctions of the pipes
- C. at the branching off points of sub-mains
- D. all the above. Discuss
- 3. To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is
Options- A. turbidimeter
- B. Jackson turbidimeter
- C. Baylis turbidimeter
- D. Hallige turbidimeter. Discuss
- 4. The period of cleaning of a slow sand filter, is usually
Options- A. 5 to 10 days
- B. two weeks to three weeks
- C. one month to three months
- D. three months to six months
- E. one year. Discuss
- 5. Flow through period, in sedimentation tanks, is
Options- A. equal to detention period
- B. more than detention period
- C. less than detention period
- D. detention period divided by displacement efficiency
- E. none of these. Discuss
- 6. Pick up the correct statement from the following :
Options- A. Lime may be used to soften the hard water
- B. Excessive use of lime may kill the bacterias
- C. Excessive lime when added to water, raises its pH value
- D. When lime raises pH value of water to about 9.5, 100% bacterias are removed
- E. All the above. Discuss
- 7. For estimating the run off of catchments, the mean value of the constant 'K' in the Khosla's formula Qy = Py - K (1.8 Ty + 32) is
Options- A. 1.21
- B. 1.23
- C. 1.25
- D. 1.27
- E. 1.31 Discuss
- 8. The bacterias which require free oxygen for their survival, are called
Options- A. Aerobic bacterias
- B. Anaerobic bacterias
- C. Faculative bacteria
- D. None of these. Discuss
- 9. The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is
Options- A. Centrifugal pump
- B. Reciprocating pump
- C. Deep well turbine pump
- D. None of these. Discuss
- 10. The detention period for plain sedimentation water tanks, is usually
Options- A. 4 to 8 hours
- B. 8 to 16 hours
- C. 16 to 24 hours
- D. 24 to 36 hours. Discuss
Water Supply Engineering problems
Search Results
Correct Answer: on the top level of dead storage
Correct Answer: all the above.
Correct Answer: Baylis turbidimeter
Correct Answer: one month to three months
Correct Answer: less than detention period
Correct Answer: All the above.
Correct Answer: 1.27
Correct Answer: Aerobic bacterias
Correct Answer: Deep well turbine pump
Correct Answer: 24 to 36 hours.
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