Water Supply Engineering problems
- 1. 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
Correct Answer: all the above.
- 2. 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
Correct Answer: on the top level of dead storage
- 3. 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. Discuss
Correct Answer: all the above.
- 4. 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
Correct Answer: All the above.
- 5. 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
Correct Answer: 1.27
- 6. 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
Correct Answer: Aerobic bacterias
- 7. 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
Correct Answer: Deep well turbine pump
- 8. 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
Correct Answer: 24 to 36 hours.
- 9. The population of a city in 2000 is 50, 000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be
Options- A. 56, 000
- B. 60, 000
- C. 64, 000
- D. 70, 000
- E. 72, 000 Discuss
Correct Answer: 72, 000
- 10. 45 litres of water per person per day, is provided in
Options- A. office buildings
- B. hotels
- C. hostels
- D. nurse's homes. Discuss
Correct Answer: office buildings
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