Ee Mid-2 Quiz Bits
Ee Mid-2 Quiz Bits
Ee Mid-2 Quiz Bits
1. The most ideal disinfectant used for drinking water throughout the world, is
a) alum
b) lime
c) chlorine
d) nitrogen
2. The maximum pressure which the pipe can withstand without any leakage during hydrostatic pressure
test, is called
a) Working pressure
b) Design pressure
c) Test pressure
d) Hydrostatic pressure
4. Generally, first portion of a logistic curve for the population growth of a developing city, represents
the growth of
a) increasing
b) decreasing
c) constant
d) all the above
8. Water is supplied from the source to the treatment plant under gravity in
a) Calcutta
b) Delhi
c) Madras
d) Bombay
9. Normal values of overflow rate for sedimentation tanks using coagulants in litres/hr/m2 , generally
range between
a) 250 to 500
b) 500 to 750
c) 750 to 1000
d) 1000 to 1250
11. If average volume of sediment deposits is one-tenth million cubic metres per year in a reservoir of
total capacity 10 million cubic metres, the dead storage will be filled up, in
a) 10 years
b) 15 years
c) 20 years
d) 25 years
13. Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided
a) silica
b) mud
c) clay
d) organic matter
14. The pH value of water is kept slightly less than 7 so that hydrochloride ions may combine with
ammonia ions to form
a) Mono-chloramine (NHCl)
b) Di-chloramine (NH2Cl)
c) Nitrogen trichloramine (NCl3)
d) Nitrogen dichloramine (NCl2)
16. The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is
a) 1 mg/litre
b) 2 mg/litre
c) 3 mg/litre
d) 4 mg/litre
19. Demand for public uses in a city, does not include water required for
a) watering of public parks
b) watering of public gardens
c) sprickling on roads
d) drinking purposes.
20. The chloride content of treated water for public supplies should not exceed
a) 100 ppm
b) 150 ppm
c) 200 ppm
d) 250 ppm
21. Dissolved carbon dioxide, can be removed from the supply main by
a) sedimentation
b) aeration
c) chlorination
d) coagulation
22. Slow sand filter is used if maximum turbidity of raw water is less than
a) 10 gm/litre
b) 20 gm/litre
c) 30 gm/litre
d) 50 gm/litre.
24. Alum is a
a) coagulant
b) flocculant
c) catalyst
d) disinfectant.
25. If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total
discharge Q, the settling velocity, is
a) Q/H
b) Q/D
c) Q/(D*B)
d) Q/(L*B)
26. In a reservoir the average volume of sediment deposition is 0.15 million cubic per year. If the dead
storage and total capacity of the reservoir are 8 million cubic metres and 36 million cubic metres
respectively
a) the reservoir will theoretically be silted in 240 years
b) the reservoir will start reducing after 60 years
c) both (a) and (b)
d) neither (a) nor (b).
34. The U.C. (uniformity coefficient) for the best filter media sand should be
a) 2
b) 3
c) 4
d) 5
35. Normal values of overflow rate for plain sedimentation tanks in litres/hr/m2, generally range
between
a) 100 to 250
b) 250 to 500
c) 500 to 750
d) 750 to 1000
36. The formula for the head loss in conduits is generally known as
a) Hazen-William's formula
b) Manning's formula
c) Darcy-Weisbach formula
d) Nikuradse formula
40. For a city developed haphazardly, the layout of distribution pipes preferred to, is
a) ring system
b) radial system
c) grid iron system
d) dead end system
44. In a well planned city, the layout of distribution pipes generally adopted, is
a) grid-iron system
b) interlaced system
c) reticulation system
d) all the above
45. Bacterias which can survive with or without free oxygen, are known
a) aerobic bacterias
b) anerobic bacterias
c) facultative bacterias
d) none of these
46. The maximum permissible colour for domestic supplies based on cobalt scale, is
a) 5 ppm
b) 10 ppm
c) 15 ppm
d) 20 ppm
47. The bacterias which may survive with or without free oxygen, are called
a) Aerobic bacterias
b) Anaerobic bacterias
c) Faculative bacteria's
d) None of these
48. Detention time for plain sedimentation tank usually ranges from
a) 4 to 8 hours
b) 2 to 4 hours
c) 6 to 10 hours
d) 12 to 16 hours.
49. The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of
a) 5 kg/cm2
b) 6 kg/cm2
c) 7 kg/cm2
d) 8 kg/cm2
54.
In plain sedimentation tanks under normal conditions, impurities are removed upto
a) 60%
b) 70%
c) 80%
d) 90%
55. The valve fitted closely in a recess against an opening in a pipe, is generally
a) wedge shaped circular disc
b) spherical disc
c) parallelopiped disc
d) conical shaped circular disc.
56. Pressure relief valves are provided in water mains
a) to reduce the pressure
b) at low points
c) upstream of sluice
d) all the above
57. In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than
a) 10
b) 15
c) 20
d) 25
58.
The maximum permissible hardness for public supplies is
a) 95 mg/litre
b) 105 mg/litre
c) 115 mg/litre
d) 125 mg/litre
62.
Efficiency of removing bacterias from raw water by a slow sand filter, is
a) 80% to 81%
b) 85% to 86%
c) 90% to 97%
d) 98% to 99%
63. De-chlorination is followed by
a) post-chlorination
b) pre-chlorination
c) double-chlorination
d) super-chlorination.
65. In slow sland filters, the turbidity of raw water can be removed only up to
a) 60 mg/litre
b) 75 mg/litre
c) 100 gm/litre
d) 150 mg/litre.
68.
Distribution mains of any water supply, is normally designed for its average daily requirement
a) 100%
b) 150%
c) 200%
d) 225%
----------Key----------
1. (c) 46. (d)
2. (c) 47. (c)
3. (d) 48. (a)
4. (a) 49. (c)
5. (a) 50. (d)
6. (a) 51. (a)
7. (d) 52. (c)
8. (d) 53. (d)
9. (d) 54. (b)
10. (a) 55. (a)
11. (d) 56. (b)
12. (d) 57. (c)
13. (a) 58. (c)
14. (c) 59. (a)
15. (c) 60. (a)
16. (a) 61. (a)
17. (b) 62. (d)
18. (d) 63. (d)
19. (d) 64. (c)
20. (c) 65. (a)
21. (b) 66. (a)
22. (d) 67. (b)
23. (d) 68. (d)
24. (a) 69. (d)
25. (d) 70. (c)
26. (c) 71. (a)
27. (a) 72. (a)
28. (a) 73. (a)
29. (a) 74. (a)
30. (a) 75. (d)
31. (b)
32. (d)
33. (c)
34. (a)
35. (c)
36. (b)
37. (c)
38. (c)
39. (a)
40. (d)
41. (d)
42. (a)
43. (d)
44. (d)
45. (c)
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