1. The size of suspended solids lies in the range of
Correct : C. 10-1 – 10-3 mm
2. Suspended solids are measured by which of the following?
Correct : B. gravimetric test
3. The maximum permissible limit for suspended solids is
Correct : C. 30 mg/l
4. Identify the correct relation between the following?
Correct : B. dissolved solid = total solid – suspended solid
5. Which method is used to measure the color of water?
Correct : C. tintometer method
6. 1 TCU (True Color Unit) is equivalent to
Correct : C. the color produced by 1 mg of platinum cobalt in 1l of distilled water
7. Threshold odour number testing is preferred in hot water.
Correct : B. false
8. One JTU is equivalent to turbidity produced by
Correct : A. 1mg of fine silica dissolved in 1l of distilled water
9. If the PO value is 6, what does it imply?
Correct : D. extremely strong odour
10. The permissible limit of turbidity of domestic water is ppm.
Correct : A. 5-10
11. What is the full form of NTU in context with turbidity?
Correct : C. nephelometric turbidity unit
12. When depth of insertion of turbidity rod increases, the reading in the turbidity rod
Correct : A. decreases
13. The average quantity of water (in lpcd) required for domestic purposes according to IS code is
Correct : D. 135
14. The average consumption of water required in factories in lpcd is
Correct : C. 30-45
15. In which type of water demand, minimum average consumption of water takes place?
Correct : D. fire demand
16. Water lost in theft and waste contributes to how much % of total consumption?
Correct : C. 15
17. What is the fire demand of the city of 1lakh population by Buston’s formula?
Correct : B. 56630
18. What are the factors affecting per capita demand?
Correct : D. cost of water, quality of water, size of city, habit of people
19. Which of the following statement is correct?
Correct : B. intermittent water supplies leads to less water consumption
20. If the annual average hourly demand of the city is 10000m3, what is the maximum hourly consumption?
Correct : A. 2700 m3
21. If in a city, the maximum daily draft is 25MLD, fire draft is 35MLD and maximum hourly draft is 40MLD, what is the coincident draft?
Correct : A. 60mld
22. What is the design period for the water treatment unit?
Correct : B. 15 years
23. What is the design discharge for intake structures?
Correct : A. maximum daily demand
24. In which of the following units, design period is maximized?
Correct : B. demand reservoir
25. A hydel power project has been envisaged to serve the water supply and irrigation needs of the area at its inception stage. The dam reservoir so constructed is known as
Correct : A. multipurpose reservoir
26. Which reservoir is also known as Mitigation reservoir?
Correct : B. flood control reservoir
27. A reservoir having gates and valves installation at its spillway and at its sluice outlets
Correct : A. storage reservoir
28. Which reservoir is helpful in permitting the pumps or the water treatment plants to work at a uniform rate?
Correct : D. distribution reservoir
29. In which of the following reservoir the flood crest downstream can be better controlled and regulated properly?
Correct : C. storage reservoir
30. What are the types of flood control reservoirs?
Correct : B. storage reservoir and retarding reservoirs
31. As the reservoir elevation increases, the outflow discharge increases.
Correct : A. true
32. The maximum discharging capacity of a retarding reservoir should not be equal to the maximum safe carrying capacity of the channel downstream.
Correct : B. false
33. Which of the following can be identified as the objective of water supply scheme?
Correct : C. safe water supply
34. Surface water can act as a source of water in water supply scheme.
Correct : A. true
35. While considering the design period, which must be given more priority?
Correct : B. population
36. Which of the following can be designated as an intake structure?
Correct : D. reservoir
37. Which type of water is generally used in the treatment of water?
Correct : C. raw water
38. Which of the following does not act as a major factor that effects per capita demand?
Correct : B. industrial activities
39. The amount of water required for 1 percent per day is determined as
Correct : D. per capita demand
40. Which of the following can act as a type of variation in water demand?
Correct : A. monthly variation
41. The Clean Water Act (CWA) regulates
Correct : A. discharge of pollutants into the waters of the united states
42. Section of CWA regulates discharges of hazardous substances.
Correct : B. 311(b)(2)(a)
43. The CWA made it unlawful to discharge any pollutant from a point source into navigable waters, unless a permit was obtained.
Correct : A. true
44. The Federal Water Pollution Control Act of 1948 was the first major U.S. law to address water pollution.
Correct : D. 1948
45. The Federal Water Pollution Control Act of 1948 became CWA.
Correct : B. true
46. The CWA reduced the amount of pollution from
Correct : A. point sources
47. The discharge of regulated chemicals into surface waters is controlled by
Correct : C. npdes
48. The maximum amount of pollution that each waterway could absorb is known as
Correct : A. tmdl
49. requires EPA to establish regulations to protect human health from contaminants present in drinking water.
Correct : B. sdwa
50. Who is responsible for the clean-up of oil spill?
Correct : C. oil pollution act
51. Which section of CWA regulates land disposal of sludge?
Correct : D. section 405
52. Which CWA program controls water pollution by regulating point sources?
Correct : C. npdes
53. Which section of CWA is responsible for monitoring of wetlands?
Correct : C. section 404
54. Which CWA program manages non-point source pollution?
Correct : A. npsmp
55. The design period of storage reservoir can be given as
Correct : A. 50 yr
56. Which material is used for pipes which are in contact with milk or product?
Correct : A. stainless steel
57. Which material is used for pipes which conduct water and air?
Correct : B. copper
58. Which material is used for pipes which conduct waste?
Correct : C. ceramic
59. Which of the following are installed in order to collect product samples hygienically for quality analysis?
Correct : C. sampling device
60. Which among the following is not a permanent wielding connection?
Correct : C. sampling device
61. Calculate area of a pipe if, flow rate is 20 l/min and flow velocity is 5 cm/s.
Correct : A. 66.66 cm2
62. Which formula is used to calculate head loss in valves?
Correct : C. k (v2/2 g)
63. Which among the following is shut-off and change over valve?
Correct : C. seat valve and butterfly valve
64. To prevent the product flow in the wrong direction which of the following valve is used?
Correct : D. check valve
65. The pipes will expand considerably when the product temperatures are high and during cleaning.
Correct : A. true
66. Valves with constant outlet pressure are used after which of the following machines?
Correct : D. filling machine
67. What is the total loss developed in a series of pipes?
Correct : C. sum of local losses plus the losses in each pipe
68. The total head loss for the system is equal to
Correct : D. height difference of reservoirs
69. Which among the following is not a loss that is developed in the pipe?
Correct : D. liquid velocity
70. Which among the following is the correct formula for head loss?
Correct : A. z1-z2
71. If the two reservoirs are kept at the same level, the head loss is
Correct : B. zero
72. How do we determine the total discharge through parallel pipes?
Correct : A. add them.
73. The pipe diameter is
Correct : B. directly proportional to mass flow rate
74. Define Viscosity.
Correct : C. resistance to flow of fluid
75. Coefficient of friction of a laminar flow is
Correct : C. 16/re
76. What is the aim of pipes system in the dairy industry?
Correct : A. facilitate product flow
77. 4 LAYING, JOINTING AND TESTING OF PIPES - APPURTENANCES
Correct : C. ceramic
78. Which grade of stainless steel is known as acid proof steel?
Correct : B. aisi 316
79. Which of the following valves is used to maintain pressure in the system?
Correct : A. pressure relief valve
80. Which of the following pump is based on the type of power?
Correct : D. steam engine pump
81. Displacement pump is classified on the basis of
Correct : A. mechanical operation of principle
82. Which of the following pump is classified based on the type of service?
Correct : C. deep well pump
83. The centrifugal pump has a flow.
Correct : C. continuous
84. The speed at which the centrifugal pump runs (in r.p.m) is
Correct : C. 500
85. The maximum efficiency of a centrifugal pump is
Correct : C. 85%
86. Based on the type of casing, the centrifugal pump is divided into types.
Correct : A. 2
87. pumps produce a head and a flow by increasing the velocity of the liquid with the help of the rotating vane impeller.
Correct : C. centrifugal pumps
88. What are the pumps that operate by alternately filling a cavity and then displacing a given volume of liquid called?
Correct : C. positive displacement pump
89. The two types of pumps behave very differently regarding pressure head and flow rate.
Correct : A. true
90. A steam pump is a type of centrifugal pump.
Correct : B. false
91. What are the pumps with one or more impellers called?
Correct : C. centrifugal pumps
92. Why are booster pumps used?
Correct : B. boost pressure
93. Why are cryogenic pumps used?
Correct : B. handle low temperature liquids
94. End suction pumps are the common type of pumps.
Correct : B. centrifugal pumps
95. Which pump among the ones mentioned below can be located above the suction reservoir without an external priming system?
Correct : B. self-priming pumps
96. Which type of pump is designed to handle rocks and other solids?
Correct : A. trash pumps
97. Which type of pump should be used in order to handle low viscosity fluids?
Correct : A. centrifugal pump
98. Which type of pump should be selected in order to pump the sewage from a septic tank to the water treatment system?
Correct : C. submersible pump
99. In an activated sludge process which type of pump is used to recirculate the sludge?
Correct : B. centrifugal pump
100. Which type of pump is used while handling the sludge disposal system?