Water Distro 1 set 2

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Author:
Hazard
ID:
268948
Filename:
Water Distro 1 set 2
Updated:
2014-04-02 12:53:26
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Water Distribution
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Water Distribution 2nd set
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  1. The difference between water pressures upstream and downstream of a pump when it is not in operation is known as the
    Total static head
  2. The sum of the total static head plus friction in the suction and discharge lines
    of a pump is that pump’s
    Total dynamic head
  3. Pumps are primed to
    Replace air inside the pump with water
  4. Backspin is occurring after well shutdown; this
    indicates
    A faulty check valve
  5. Enclosed,open, and semi-closed are terms used for the designation and selection of
    Impellers
  6. A pump’s packing gland serves many purposes, including which of the following?
    • Keeps gritty material from
    • entering the packing box
  7. If a pump sounds like it is pumping rocks, the
    most likely cause is
    Cavitation
  8. Which of the following is a positive
    displacement pump?
    a.         Air lift pump

    b.         Centrifugal pump

    c.         Piston pump

    d.         Turbine pump

    e.         All of the above
    Piston pump
  9. The practical maximum suction lift for a
    centrifugal pump in good condition
    20-feet to 25-feet
  10. A type of pump that can cause discharge line
    rupture from over-pressurizing is
    Positive displacement
  11. A common horizontal linkage between a centrifugal pump and its motor is the
    Coupling
  12. The main water-containing body of a centrifugal pump is commonly called the
    Volute
  13. The total dynamic head of a pump is 255 feet. 
    This is equivalent to
    110 psi = 255/2.31
  14. A pump is located at elevation 250 feet, and it is moving water from elevation
    275 feet on its suction side to elevation 400 feet on its discharge side.  What is the total static head?
    125 feet
  15. The rotating element in a centrifugal pump is commonly called the
    Impeller
  16. A pump is located at elevation 250 feet, and it is moving water from elevation
    275 feet on its suction side to elevation 400 feet on its discharge side.  What is the static pressure on the suction
    side of this pump?
    25 feet
  17. A pump is located at elevation 250 feet, and it is moving water from elevation 275 feet on its suction side to elevation 400
    feet on its discharge side.  The friction
    in this system is equivalent to 20 feet of head.  What is the total dynamic head for this pump?
    145 feet
  18. A field chlorine residual measurement shows no reading after one minute during the free test, but 2.1 mg/L after three minutes during the total test.  This indicates that
    There is no free chlorine residual, but there are 2.1 mg/L of chloramines
  19. Chlorine residual is measured in the field using
    the
    DPD colorimetric method
  20. The fusible plug that is in all chlorine
    containers
    Should never be removed or tampered with
  21. Working within an atmosphere with a severe
    chlorine gas leak requires the use of
    • Self-contained breathing
    • apparatus (SCBA)
  22. The device that generates the vacuum conditions for chlorine gas application is called an
    Eductor
  23. Chlorine gas

    a.   Is heavier than air

    b.   Is lighter than air

    c.   Will turn to liquid at normal room
          temperatures

    d.   Is dark blue in color

    e.   Is non-toxic in low concentrations
    Is heavier than air
  24. The substance used to detect the presence of
    small chlorine gas leaks is
    Ammonia
  25. The device used to regulate and control the rate of feed of chlorine gas is called a
    Chlorinator
  26. The amount of gas that can be withdrawn from a one-ton chlorine container is
    400 pounds per day
  27. Chlorine in the
    gas form is

    a.   100% chlorine

    b.   Highly toxic

    c.   Yellow-green in color

    d.   An effective drinking water disinfectant

    e.   All of the above
    All of the above
  28. Hypochlorous acid in water is also known as
    Free chlorine
  29. The purpose of fusible plugs on chlorine
    containers is to
    • Relieve excess
    • internal pressure and thus avoid explosions
  30. A “B” repair kit is used to address equipment
    failures on
    One-ton chlorine containers
  31. When chlorine gas is to be withdrawn from a
    one-ton container, you must use the
    Upper valve
  32. How many pounds per day of chlorine gas are needed
    to treat a flow of 8.5 MGD at a dosage of 2.75 mg/L?
    • lb/day        =          mg/L x  8.34  x  MGD
    •                  
    •                  =          2.75  x  8.34 X 8.5 

                      =          195 lb/day
  33. A chlorinator is feeding 240 pounds per day at a treatment plant operating at 24 MGD. 
    What is the current chlorine dosage rate in milligrams per liter?
    • mg/L         =          lb/day  ÷ (8.34  x  MGD)
    •                  
    •                 =    240       ÷ (8.34  x  24)
    •                 =    1.2 mg/L
  34. A treatment plant’s desired chlorine dosage rate is 3.5 mg/L, and its current
    flow rate is 8000 gallons per minute. 
    What should the pounds per day setting be on the plant’s chlorinator?
    • lb/day        =          mg/L x  8.34  x (MGD)
    •                 =    3.5 x  8.34  x (8000 gal/min x                  1440 min/day ÷ 1,000,000 gal/Mgal)
    • =          336 lb/day
  35. Which of the following is the least potent
    disinfectant?
    a.   Hypochlorous acid

    b.   Hypochlorite ion

    c.   Chloramines

    d.   Ozone

    e. All of the above are equally potent
    c.   Chloramines
  36. The concentration of available chlorine in chlorine gas from 1-ton containers is
    100%
  37. Which of the following will produce the highest
    concentration of THMs?
    a.   Free chlorine

    b.   Chlorine dioxide

    c.   Chloramines

    d.   Ozone

    e.   All of the above are equal in THM production
    a.         Free chlorine
  38. Chlorine isapplied at a dosage rate of 2.5 mg/L. After a reaction time of over 4 hours in the clearwells, the chlorine
    residual is 1.5 mg/L.  What is the
    chlorine demand?
    a.   1.0 mg/L
  39. Free chlorine residual in water exists in
    two forms.  These are
    • Hypochlorous acid and
    • hypochlorite ion
  40. What percentage of routine distribution system
    samples must exhibit a detectable disinfectant residual?
    d.   95 %
  41. When sodium hypochlorite is dissolved in water, which of the following is formed?
    Sodium hydroxide (lye, or caustic soda)
  42. Which of the following is formed when any type of chlorination chemical is added to water?
    Hypochlorous acid
  43. Which of the following is the most potent disinfectant?

    a.   Free chlorine

    b.   Chlorine dioxide

    c.   Chloramines

    d.   Ozone

    e.   All of the above are equally potent
    Ozone
  44. The sum of a disinfectant’s demand and its
    residual is equal to the
    Applied dosage
  45. Which of the following is best at removing odors from water?
    a.   Free chlorine

    b.   Chlorine dioxide

    c.   Chloramines

    d.   Ozone

    e.   All of the above will equally form bromate
    d.   Ozone
  46. The sum of a disinfectant’s demand and its residual is equal to the
    Applied dosage
  47. Which of the
    following is being used as an alternative drinking water disinfectant?

    a.   Sodium hypochlorite

    b.   Ultraviolet light

    c.   Ethanol

    d.   Protons

    e.   Beta radiation
    b.         Ultraviolet light
  48. .     Which of the following is the most
    associated with the DBP bromate?

    a.   Free chlorine

    b.   Chlorine dioxide

    c.   Chloramines

    d.   Ozone

    e.    All of the above will equally form            bromate
    d.   Ozone
  49. The chemical normally withdrawn from a bulk chlorine storage tank car or rail car is
    Chlorine liquid
  50. Which of the
    following is the most associated with the DBP chlorite?
    Chlorine dioxide
  51. Which of the
    following is also known as “combined chlorine”?

    a.   Chlorine dioxide

    b.   Trichloromethane

    c.   Carbon tetrachloride

    d.   Chlorobutane

    e.   Chloramines
    Chloramines
  52. Which of the following is commonly used as a
    secondary disinfectant?
    Chloramines
  53. Which of the following will normally produce a residual effect for less than two hours?
    a.   Chlorine dioxide

    b.   Calcium hypochlorite

    c.   Sodium hypochlorite

    d.   Chlorine gas

    e.   Chloramines
    Chlorine dioxide
  54. In an occupied trench where exits (i.e.,
    ladders) are required, what is the maximum allowed travel distance between an
    occupant and the nearest exit?
    25 feet , 50' from ladder to ladder.
  55. Standard first aid procedures direct that the
    first step to control bleeding is to
    Apply pressure directly to the wound
  56. When excavating materials that will not stand in a vertical position, the most suitable form of shoring is
    Solid sheeting
  57. A potable water supply discharges into an
    irrigation water storage tank.  The
    potable supply line should be terminated
    Above the tank overflow by at least two pipe diameters
  58. Which of the following gases is toxic at the
    lowest concentration?
    Hydrogen sulfide
  59. Entry into an atmosphere with high
    concentrations of chlorine gas requires
    A self-contained breathing apparatus
  60. What information must be on a warning tag attached to a locked-out switch?
    Signature of the person who locked out the switch and who will remove it
  61. An abnormal flow condition caused by a
    difference in water pressures is known as
    Backflow
  62. A bacteriological sampling bottle should be
    Filled carefully to leave a small air space
  63. A cross-connection means
    A connection between potable water and “unapproved” water supplies
  64. A backflow prevention device that can be used in any cross-connection situation is a
    Reduced pressure zone device
  65. A confined space that contains a material that
    has the potential to engulf an entrant is
    A permit space
  66. Egress is normally required for trenches of what minimum depth?
    4-feet
  67. Bacteriological sample bottles which are
    furnished by a certified laboratory
    Are ready to use
  68. How long must a sample tap be flushed prior to sample collection?
    As long as necessary to permit clearing of the service line
  69. What condition must exist for an area to be
    considered a confined space?
    a.         Limited or restricted means of entry             or exit

    b.         Is large enough for a person to enter
    and perform work

    c.         Is not designated for continuous
               occupancy

    d.         All of the above

    e.         None of the above
    d.         All of the above
  70. The backflow prevention device used in home lawn sprinkler systems is a
    Atmospheric vacuum breaker
  71. A completely fail-safe means of backflow
    prevention is
    Air gap
  72. Which of the following is the most likely to be
    a fuel involved in a Class B fire?
    a.         Wood

    b.         Magnesium

    c.         Electrical equipment

    d.         Gasoline

    e.         Paper and/or fabrics

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