Quiznetik

Environmental Engineering | Set 1

1. Which system of collection of sewage is a dry system?

Correct : A. conservancy system

2. After how many years, night soil gives good quality manure?

Correct : A. 1

3. Conservancy system is a highly unhygienic system, causing insanitary conditions.

Correct : A. true

4. Which of the following is not correct regarding conservancy system?

Correct : C. independent of labour

5. Which system of collection of sewage is called a dry system?

Correct : A. conservancy system

6. is a method where water is used as a medium for the flow of sewage from its production of the treatment unit.

Correct : D. water carriage system

7. The water carriage system is a hygienic system without any bad smell.

Correct : A. true

8. Which of the following is correct regarding water carriage system?

Correct : C. does not cause pollution

9. Which of the following is an advantage of a separate water carriage system?

Correct : D. the more uniform character of sewage

10. Which of the following is a disadvantage of a separate water carriage system?

Correct : C. lesser air contact with small sized sewer

11. provides only one sewer to carry both foul sewage and rainwater.

Correct : B. combined water carriage system

12. Which of the following is an advantage of the combined water carriage system?

Correct : A. there is more air in large sewer

13. Which of the following is incorrect regarding partially combined water carriage system?

Correct : B. there is choking of sewer

14. The choice of combined water carriage system does not depend on

Correct : C. steep topography

15. is the flow through sewers available during non-rainfall period.

Correct : C. dry weather flow

16. is the additional flow occurring during rainy season.

Correct : D. storm water flow

17. Which flow is also called as sanitary sewage?

Correct : A. dry weather flow

18. Which of the following factor does not effect the dry weather flow?

Correct : B. temperature conditions

19. The sewer should be designed for a minimum of              litres of waste water per capita per day.

Correct : C. 150

20. is the process in which ground water unfiltrate into the sewers.

Correct : B. infiltration

21. is the process which indicates the flow of waste water from the sewer into the ground.

Correct : A. exfiltration

22. The peaking factor is defined by

Correct : D. peak flow / average flow

23. The peaking factor is directly proportional to the population of the city.

Correct : B. false

24. The wet weather flow is also known by

Correct : C. storm water flow

25. Which of the following surface has a maximum Kuichling’s impermeability factor?

Correct : B. water tight roof surface

26. The expression of the Chezy’s formula is given by

Correct : C. v = c (rs)1/2

27. Which of the following is the expression of the Manning’s formula?

Correct : C. $$$V = R^{2/3}S^{1/2}/N$$$

28. is the velocity at which the solid matter in sewage remained in suspended form.

Correct : B. self cleansing velocity

29. Primary treatment of sewage consists of removal of

Correct : A. large suspended organic solids

30. The most widely used pumps for sewage lifting is

Correct : A. centrifugal pummp

31. Drop man holes are generally provided in sewers for

Correct : C. hilly townships

32. The pollution zones in the river are divided into how many types?

Correct : B. 4

33. In which pollution zone of the river, growth of algae reappear?

Correct : B. zone of recovery

34. In which pollution zone of the river, the dissolved oxygen reduced to 0?

Correct : D. zone of active decomposition

35. Which is the third zone of pollution in the river?

Correct : A. zone of recovery

36. What is yellow curve represents in the following figure?

Correct : A. deoxygenation curve

37. Which of the following is represented b the green curve in the above figure?

Correct : B. reoxygenation curve

38. The maximum deficiency of dissolved oxygen is represented by

Correct : A. dotted blue line

39. Which of the following represents the oxygen sag curve in the following figure?

Correct : D. red curve

40. The reoxygenation constant at temperature ‘T’ is expressed by

Correct : C. krt = kr20 (1.016)t-20

41. The minimum spacing between the bars on fine screen is

Correct : C. 1.5mm

42. The spacing between the bars in racks is

Correct : B. 50mm

43. Screens are inclined to the direction of flow to

Correct : C. decrease the flow velocity

44. The maximum spacing between the bars in medium screen is

Correct : A. 40mm

45. What is the maximum capacity of medium screen in collecting solids?

Correct : D. 90l

46. The design velocity of flow of a detritus tank is

Correct : C. 0.9m/sec

47. Which of the following device is used for the removal of oil and grease?

Correct : A. skimming tank

48. How many types of settling are there in the sedimentation tank?

Correct : B. 4

49. In which type of settling, sedimentation of discrete particles takes place?

Correct : D. discrete settling

50. The settling velocity of spherical particle is given by

Correct : C. stokes equation

51. In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?

Correct : C. compression settling

52. In which settling type, dilute suspension of particles takes place?

Correct : C. hindered settling

53. What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10-3cm. Given G=2.65, viscosity v=8 * 10-3cm2/Sec?

Correct : B. 0.13cm/sec

54. The average time required by water to pass through the settling tank is called

Correct : B. flow through period

55. In preliminary treatment of sewage, the operation which takes place, is

Correct : C. removal of lighter floating material

56. How many types of aerators are commonly used in the treatment of wastewater?

Correct : A. 2

57. The detention period of detritus tank is

Correct : C. 3 minute

58. How many types of trickling filters are used in sewage treatment?

Correct : D. 2

59. The depth of the filter media of intermittent filter is

Correct : B. 60cm

60. Which of the following filter is used in the anaerobic treatment of sewage?

Correct : D. biological filter

61. The maximum size of filter media of a percolating filter is

Correct : D. 75mm

62. The recirculation ratio for the low rate trickling filter is

Correct : D. 0

63. The BOD after the filtration of sewage from the low rate trickling filter is

Correct : B. 80-90%

64. The efficiency of a percolating filter is given by

Correct : D. 100/(1+0.0044 (??) 1/2)

65. The organic loading in low rate trickling filter is 900 kg/hectare- meter/day. What is the efficiency of the filter?

Correct : B. 0.883

66. The color of the secondary sludge produced from the high rate trickling filter is

Correct : C. brown

67. is the ratio of volume of recirculated sewage to the raw sewage.

Correct : B. recirculation ratio

68. The size of filter media in a high rate trickling filter is

Correct : C. 25-60mm

69. Which of the following is called as air diffusion method?

Correct : B. diffused air aeration

70. The maximum depth of aeration tank used in activated sludge process is

Correct : C. 4.5m

71. Which type of reactor is used for mixing chemicals in water treatment?

Correct : B. batch reactor

72. Which reactors are characterized by non- continuous reactions?

Correct : C. batch reactor

73. SBR is a type of

Correct : B. activated sludge process

74. How is mixing done in SBR?

Correct : B. mechanical

75. In which stage of the SBR is aeration performed?

Correct : B. second

76. Which of the following is an anaerobic process for treating sewage?

Correct : B. imhoff tank

77. The minimum design depth of oxidation pond is

Correct : C. 1m

78. The detention period of oxidation pond is

Correct : C. 10-20 days

79. The maximum BOD removal efficiency of an oxidation pond is

Correct : A. 0.9

80. What is the minimum depth of water to be kept in the oxidation pond?

Correct : C. 1 m

81. What is the shape of the oxidation ditch?

Correct : D. oval

82. The ditch is lined by                layer.

Correct : D. impermeable

83. What is the range of MLSS concentration in oxidation ditch?

Correct : D. 3000-5000 mg/l

84. Which of the following process is not adopted in oxidation ditches?

Correct : B. desorption

85. The disposal of sewage from the septic tank is done by which of the following?

Correct : B. soak pit

86. The detention period of a septic tank is

Correct : B. 12-36 hours

87. The concentration of biodegradable organic matter after the septic tank is

Correct : C. 200ppm

88. What is the maximum design flow of sewage in a septic tank?

Correct : A. 70 liters per person per day

89. Which of the following is not the method of disposal of sewage from septic tank?

Correct : C. vacuum filter

90. The minimum depth of septic tank as per design consideration is

Correct : C. 1.2m

91. The efficiency of a percolating filter is given by

Correct : D. 100/(1+0.0044 (μ) 1/2)

92. Turbidity of water is usually measured in terms of

Correct : B. Silica scale

93. Which of the following pollutant affects lungs?

Correct : A. Silica

94. Black holes are celestial bodies which

Correct : C. Do not allow any light to escape outside

95. The emission of carbon monoxide in automobile exhaust will be low when the vehicle is

Correct : D. cruising at high speeds

96. Temporary hardness in water in caused by salts like

Correct : D. Carbonates

97. The colour of water is measured

Correct : C. In terms of platinum cobalt scale

98. Air pollutants common to urban environments are

Correct : D. All of the above

99. Ionisation chamber can be used for the detection of all of the following EXCEPT

Correct : D. Alpha rays

100. Which of the following is used in the recently developed technology for communication?

Correct : A. Optical fibre