D3-D4 Sample Questions

1. Main size, pump stations, and storage tanks are determined by: ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

2. Which of the following is a measure of the smoothness of a pipe? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

3. Why is excessive water pressure in residences objectionable? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

4. What is the pounds per square inch pressure at the bottom of a tank, if the water level is 33.11 feet deep? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

5. Under the requirements of the Safe Drinking Water Act, it is the duty of the water purveyor to deliver? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

6. In general, a trench should be no more than how many feet wider than the diameter of the pipe? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

7. Which of the following is a distribution system layout pattern? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

8. Complaints of poor water quality will most likely occur in which type of water main layout? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

9. Vacuum breakers are designed to be used on piping connections where? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

9. Vacuum breakers are designed to be used on piping connections where? ,[object Object],New England Water Works Association Atmospheric vacuum breaker Double check valve

10. Which of the following will least likely increase soil corrosion? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

11. What type of pipe joint is best to use under high groundwater and muddy conditions despite the best efforts to pump the groundwater out of the trench? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

12. As the temperature of the water increases, the disinfecting action of chlorine is ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

13. Why is a well acidified? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

14. pH is a measure of ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

pH 7.0: # H + = # OH - pH < 7.0: # H + > # OH - pH > 7.0 = # H + < # OH - ,[object Object],New England Water Works Association ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

15. What is the recommended minimum contact time when disinfecting water mains with the chlorine slug method? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

16. Where are chlorine samples typically collected from in the distribution system? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

17. Which of the following best describes the cone of depression ? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

18. Turbidity is caused by ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

19. What is the term for water samples collected at regular intervals and combined in equal volume with each other? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

20. What chemical is present in a bacteria sample bottle for the purpose of neutralizing chlorine? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

21. The residual drawdown of a well is defined as ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

22. What is the basis for the number of samples that must be collected for utilities monitoring for lead and copper that are in compliance or have installed corrosion control? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

23. The quantity of oxygen that can remain dissolved in water is related to ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

24. In coliform analysis using the presence-absence test, a sample should be incubated for ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

25. A well produces 365 gpm with a drawdown of 22.5 ft. What is the specific yield in gallons per minute for foot? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

25. A well produces 365 gpm with a drawdown of 22.5 ft. What is the specific yield in gallons per minute for foot? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association Sp. Yield = gpm/ft Sp. Yield = 365/22.5 Sp. Yield = 16.222 gpm/ft

26. Which type of pipe is typically used in the construction of very large water mains? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

27. Which of the following analytical tests is the most important? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

28. After a new main is installed and pressure tested, it should be ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

29. What type of rupture or break may occur when a pipe is unevenly supported along its length? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

29. What type of rupture or break may occur when a pipe is unevenly supported along its length? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],New England Water Works Association

30. What is AWWA’s recommended maximum distance between valves in a residential area? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

31. How much space should there be between the shoring and the sides of the excavation? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

32. What is the minimum diameter of a water main to be used for the installation of a fire hydrant? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

33. What is the best location for a tap on a main? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

34. How many inches above the ground surface should the breakaway flange on fire hydrants be located? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

35. Which of the following types of valves should be installed between fire hydrants and mains? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

36. What is the best method to use to avoid contamination of a main when installing a new service connection? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

37. What backflow prevention device has a center relief valve? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

38. As a general rule, water pipes should be separated from sewer pipes by a horizontal distance of? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

39. Fire hydrants should generally be set back from the curb by a least? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

40. How many valves should be installed on main intersections? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

41. Which of the following is associated with using a pressure tap to make connections of new mains to an existing mains? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

42. Which type of hydrant has no main valve but a separate valve for each nozzle? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

43. What is the maximum theoretical suction lift of a centrifugal pump at sea level? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

44. What type of motor in the simplest of all AC motors, with rotors consisting of a series of bars placed in slots? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

45. Which of the following type of valve is used in maintaining prime to a pump? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

46. What type of cleaning plug has hardened steel or silicon carbide wire brushes? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

47. For best results, what is the minimum flushing velocity when using the unidirectional flushing method? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

48. Which of the following characteristics of a pump is shown in a pump curve? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

49. What type of motor is used when infrequent starting is required and load needs to be brought up to speed very quickly? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

50. What type of level sensor has air connected to a pressure transducer via a tube? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

51. What type of instrumentation should be used to monitor distant locations? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

52. Which of the following valves should be used when it becomes necessary to supply water at different pressure zones? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

53. Which of the following pumps should be used to increase pressure at large distribution systems? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

54. Which of the following materials makes the best anode? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

55. AWWA recommends 5/8 in. meters be tested every ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

56. What is the term used for electrochemical corrosion caused by the joining of two different materials? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

57.Which class of fire involves electrical equipment? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

58. When a permit is required to enter a confined space, who may sign the permit? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

59. What is the primary health risk of trihalomethanes? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

60. Permit-required confined space entry requires ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

61. An atmosphere is defined as oxygen deficient if it contains less than what percent of oxygen by volume? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

62. During a confined space entry, how often must the confined space be monitored for hazardous atmospheres? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

63. Under any soil conditions, cave-in protection is required fro trenches or excavations that are how many feet deep? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

64. Which of the following is colorless, odorless, lighter than air, highly flammable, and sometimes called swamp gas? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

65. Material Safety Data Sheets (MSDSs) are required for ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

66. Fire protection facilities for each community are evaluated by ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

67. Continued inhalation of radon gas is considered to contribute to which of the following ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

68. When work is being performed in streets, the flagman should be positioned at least how many feet in front of the work space? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

69. What health effect category refers to an organic chemical that is a known carcinogen? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

70. All occupied trenches 4 or more feet deep must provide exits at ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

71. The SDWA defines a public water system that supplies piped water for human consumption as one that has ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

72. Which of the following is considered an acute risk to health? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

73. Records for turbidity analyses should be kept for a minimum of ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

74. What is the difference between a primary standard and a secondary standard? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

75. What type of computer software is recommended for maintaining records such as turbidity levels? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

76. How should a supervisor handle a recurring problem with an operator? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

77. What should a supervisor do if an employee is performing work in an unsafe manner? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

78. What is the actual level for lead? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

79. What type of curb box eliminates the possibility of alignment? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

80. What type of curb box fits loosely over the curb stop and meter? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

81. What is the term for the height of a column of water will rise in a well? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

82. Current meters are also known as ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

83. What type of meter is used for measuring dirty or corrosive water? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

84. When using a power tool to open or close valves in the distribution system, it is best to ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

85. What type of meter is based on the Doppler effect? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

86. Piping containing reclaimed water should be painted what color? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

86. Piping containing reclaimed water should be painted what color? ,[object Object],New England Water Works Association

87. Fire demand can account for what percent of the total capacity of a storage system? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

88. Fuel oils, gasoline, and other organic compounds may permeate which type of piping? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

89. What type of concrete reservoir is constructed much like a swimming pool, is rather shallow, and difficult to cover? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

90. Which of the following types of valve is used to throttle the flow of water? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

91. What is the name of the pipe that serves as the inlet and outlet to an elevated tank? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

92. Which class of fire involves sodium or magnesium? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

93. Which type of hydrant is hidden from public view? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

94. What is the health risk associated with nitrate in water? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

95. A solution of 63.5% calcium hypochlorite contains how many milligrams per liter of calcium hypochlorite in the solution? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

[object Object],[object Object],[object Object],[object Object],95. A solution of 63.5% calcium hypochlorite contains how many milligrams per liter of calcium hypochlorite in the solution? New England Water Works Association

96. What is the difference between a weak acid and a strong acid? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

97. How must water systems serving over 10,000 distribute consumer confidence reports to customers? ,[object Object],[object Object],[object Object],[object Object],New England Water Works Association

97. How must water systems serving over 10,000 distribute consumer confidence reports to customers? ,[object Object],New England Water Works Association

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