Water Supply Engineering problems
- 1. Disinfection of water with ozone is not good because
Options- A. it vanishes before water reaches the consumers
- B. it removes the colour, taste and odour from water as bacterias
- C. it adds taste to the water
- D. it is more efficient than chlorine in killing bacterias
- E. none of these. Discuss
Correct Answer: it is more efficient than chlorine in killing bacterias
- 2. The main draw-back of centrifugal pump, is
Options- A. necessity of priming
- B. discharge from pump varies with the load of water
- C. for high heads, efficiency is low up to 50%
- D. the suction lift is limited to 6 m
- E. all the above. Discuss
Correct Answer: all the above.
- 3. The equation
in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as
Options- A. English formula
- B. Khosla's formula
- C. Justin's formula
- D. Vermule's formula. Discuss
Correct Answer: Justin's formula
- 4. A pressure conduit laid under ground, may not be subjected to
Options- A. internal pressure of water
- B. pressure due to external load
- C. longitudinal temperature stress
- D. longitudinal stresses due to unbalanced pressure to bends
- E. none of these. Discuss
Correct Answer: longitudinal temperature stress
- 5. The best process of disinfection of public water supply, is by
Options- A. boiling
- B. chlorination
- C. adding lime
- D. adding zone. Discuss
Correct Answer: chlorination
- 6. E. Coli bacterias die in water having pH greater than
Options- A. 5.5
- B. 6.5
- C. 7.5
- D. 8.5
- E. 9.5 Discuss
Correct Answer: 9.5
- 7. The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is
Options- A. 0.0033
- B. 0.0044
- C. 0.0055
- D. 0.0066 Discuss
Correct Answer: 0.0055
- 8. Mathamoglobinemia, or blue baby disease is caused due to
Options- A. chlorides
- B. nitrites
- C. nitrates
- D. sulphides. Discuss
Correct Answer: nitrates
- 9. An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as
Options- A. acquifer
- B. aquiclude
- C. aquifuge
- D. none of these. Discuss
Correct Answer: aquiclude
- 10. Pick up the incorrect statement from the following :
Options- A. An impervious layer a few metres below the water table in the sub-soil, is generally called Mota layer (6) Mota layer is very useful to give structural support to open deep wells
- B. A bore hole is generally provided in the mota layer for deep wells
- C. Shallow wells are always of less depth as compared to deep wells
- D. None of these. Discuss
Correct Answer: None of these.
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