Water Distribution 1 certification state
exam questions and answers Graded-A
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Potable water may be defined as:
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a. Any water that occasionally may be polluted from another source
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b. Any water that, according to recognized standards, is safe for consumption
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c. Water high in organic content Il` Il` Il` Il` Il`
d. Water that has been transported from outside the service area - CORRECT ANSWER-
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b). Any water that according to recognized standard is safe for human consumption.
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To prevent the entry of surface contamination into a well is the purpose of:
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a. The well casing Il` Il` Il`
b. The louvers or slots Il` Il` Il` Il`
c. Well development Il` Il`
d. The sanitary seal - CORRECT ANSWER-d) The Sanitary Seal
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Pure water will exhibit a pH value of?
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a. 0.0 Il`
b. 7.0 Il`
c. 10.5 Il`
d. 14.0 - CORRECT ANSWER-b) 7.0
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A pH reading of 6.0 units indicates that the water sample is:
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a. Very acidic Il` Il`
b. Slightly alkaline Il` Il`
c. Very alkaline Il` Il`
d. Slightly acidic - CORRECT ANSWER-d) Slightly Acidic
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In drinking water quality, "TDS" is the abbreviation for?
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a)Total digestable substances Il` Il`
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b) Total dissolved solids
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c) Time-delayed sicknesses
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d) Terminal diseases started - CORRECT ANSWER-b) Total Dissolved Solids
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In drinking water regulations, the abbreviation "MCL" stands for?
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a) Maximum contaminant level
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b) Multiple constituent levels
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c) Most common level
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d) Minimum considered legal - CORRECT ANSWER-a) Maximum contaminant level
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The MBAS method is used to determine levels of which of the following drinking water
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constituents? - CORRECT ANSWER-Forming Agent
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In water quality, the symbol "mg/L" is equivalent to:
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a. Micrograms per liter Il` Il` Il`
,b. Parts per million Il` Il` Il`
c. Parts per billion Il` Il` Il`
d. Mostly good levels - CORRECT ANSWER-b) Parts per million
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The term "clearwell" refers to a? - CORRECT ANSWER-Reservoir at the outlet of a
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water treatment plant.
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A mechanical device often employed to prevent the over-filling and/ on over-draining of
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distribution system reservoir is the? - CORRECT ANSWER-Altitude Valve
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The primary cause of water quality deterioration in distribution system is? - CORRECT
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ANSWER-Water age
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The term "Springline" applies to? - CORRECT ANSWER-The midline of a pipeline
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When possible, a water main should be tapped while still pressurized to? - CORRECT
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ANSWER-Minimize contamination risk
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A connection made into a water main that is full of under pressure is called a?
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a. Cross connection
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b. Valve box Il` Il`
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c. Wet tap Il` Il`
d. Spinal tap - CORRECT ANSWER-c) Wet tap
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A special valve that is used almost exclusively to facilitate making connections to
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pipeline is the?
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a. Gate valveIl` Il`
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b. Corporation stop
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c. Altitude valve
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d. Auxiliary valve - CORRECT ANSWER-b) Corporation Stop
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Which of the following gases will deaden the sense of smell?
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a. Carbon dioxide
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b. Hydrogen sulfide
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c. Methane Il`
d. Oxygen - CORRECT ANSWER-b) Hydrogen Sulfide
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The most commonly used meter on small domestic services?
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a. Venturi meter Il` Il`
b. Propeller meter Il` Il`
c. Orifice plate meter Il` Il` Il`
d. Nutating disc meter - CORRECT ANSWER-d) Nutating Disk Meter
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A Nutating disk is found in certain?
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a. Positive displacement pumps Il` Il` Il`
b. Main line valves Il` Il` Il`
c. Chemical feeders Il` Il`
d. Water meters - CORRECT ANSWER-d) Water meters
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A pump is experiencing back-spin after it is shut down. What is the most likely cause? -
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, Il`
CORRECT ANSWER-Malfunction check valve
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When fully open, which of the following valve types will have the highest friction loss?
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a. Gate valve Il` Il`
b. Globe valve Il` Il`
c. Ball valve Il` Il`
d. All will have about the same friction loss. - CORRECT ANSWER-b) Globe valve
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The main purpose of a butterfly valve in a water distribution system is for? - CORRECT
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ANSWER-Isolation
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The most likely means of connecting two pressure zone is through a? - CORRECT
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ANSWER-Pressure reducing valve
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Which of the following devices is routinely used to reduce system pressure? -
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CORRECT ANSWER-Globe valve
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A venture or a weir is a device that is used to ? - CORRECT ANSWER-Measured water
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flow
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The most common valve in water distribution system is the? a.
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Gate valve
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b. Butterfly valve Il` Il`
c. Check valve Il` Il`
d. Globe valve - CORRECT ANSWER-a) Gate valve
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Venturi meters operate under the principle of? - CORRECT ANSWER-Pressure Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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differential
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An auxiliary valve is always located adjacent to a? - CORRECT ANSWER-Fire
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Hydrants
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If you encounter a liquid chlorine leak in a one-ton container. What action should you
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take first, to reduce the severity of the leak?
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a. Apply a caustic solution Il` Il` Il` Il`
b. Spray the container with water Il` Il` Il` Il` Il`
c. Spray the container with an ammonia solution Il` Il` Il` Il` Il` Il` Il`
d. Rotate the container to place the leak at the top - CORRECT ANSWER-d) Rotate the Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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container to place the leak at the top
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The most commonly used water disinfectant in the United States is?
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a. Chlorine Dioxide
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b. Ozone Il`
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c. Chlorine and Ammonia (chloramines)
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d. Chlorine - CORRECT ANSWER-d) Chlorine
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When collecting a distribution system sample, the water should be allowed to run for a
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period of time prior to sample collection. This period of time is?
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a. At least two minutes Il` Il` Il` Il`
b. At least five minutes Il` Il` Il` Il`
, c. At least thirty minutes Il` Il` Il` Il`
d. As long as necessary to permit clearing of the service line - CORRECT ANSWER-d) As
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long as necessary to permit clearing of the service line
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Sample bottles which are furnished by a certified laboratory for collection of Il` Il` Il`
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bacteriological same?
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a. Should be rinsed with the water to be sampled before use Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
b. Should be rinsed with a chlorine solution before use Il` Il` Il` Il` Il` Il` Il` Il` Il`
c. Should be rinsed with distilled water before use Il` Il` Il` Il` Il` Il` Il` Il`
d. Are ready to use - CORRECT ANSWER-d) Ready to use
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A device that automatically shuts off flow into an elevated storage tank when water level
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in the tank reaches a preset level is termed a?
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a. Air / vacuum relief valve
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b. Wet-barrel hydrant
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c. Altitude valve
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d. Angle valve - CORRECT ANSWER-c) Altitude valve
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red - CORRECT ANSWER-Electric Power line, Cable Conduit and Lighting
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Yellow - CORRECT ANSWER-Gas, Oil, Stream, Petroleum, or Gasesous Materials
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Orange - CORRECT ANSWER-Communications, Alarm or Signal Lines, or Conduit
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Purple - CORRECT ANSWER-Reclaimed Water, Irrigation, and Slurry Lines
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Blue - CORRECT ANSWER-Potable Water
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Green - CORRECT ANSWER-Sewers and Drain Lines
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Pink - CORRECT ANSWER-Temporary Survey Markings
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White - CORRECT ANSWER-Proposed Excavating
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The presence of coliform bacteria in a distribution system?
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a. Is positive proof that pathogenic organisms are present
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b. Requires the use of brilliant green bile as a secondary disinfectant Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
c. Indicates that pathogenic organisms may be present also Il` Il` Il` Il` Il` Il` Il` Il`
d. Has no particular significance - CORRECT ANSWER-c) Indicates that pathogenic
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organisms may be present also
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Most below-ground-level storage tanks are constructed of?
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a. Fiberglass Il`
b. Steel Il`
c. Concrete Il`
d. Special composite materials - CORRECT ANSWER-c) Concrete
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When fully open, which of the following will have the lowest friction loss?
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a. Gate valve Il` Il`
b. Butterfly valve Il` Il`
c. Globe valve Il` Il`
d. All will have about the same friction loss. - CORRECT ANSWER-a) Gate valve
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exam questions and answers Graded-A
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Potable water may be defined as:
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a. Any water that occasionally may be polluted from another source
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b. Any water that, according to recognized standards, is safe for consumption
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c. Water high in organic content Il` Il` Il` Il` Il`
d. Water that has been transported from outside the service area - CORRECT ANSWER-
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b). Any water that according to recognized standard is safe for human consumption.
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To prevent the entry of surface contamination into a well is the purpose of:
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a. The well casing Il` Il` Il`
b. The louvers or slots Il` Il` Il` Il`
c. Well development Il` Il`
d. The sanitary seal - CORRECT ANSWER-d) The Sanitary Seal
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Pure water will exhibit a pH value of?
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a. 0.0 Il`
b. 7.0 Il`
c. 10.5 Il`
d. 14.0 - CORRECT ANSWER-b) 7.0
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A pH reading of 6.0 units indicates that the water sample is:
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a. Very acidic Il` Il`
b. Slightly alkaline Il` Il`
c. Very alkaline Il` Il`
d. Slightly acidic - CORRECT ANSWER-d) Slightly Acidic
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In drinking water quality, "TDS" is the abbreviation for?
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a)Total digestable substances Il` Il`
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b) Total dissolved solids
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c) Time-delayed sicknesses
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d) Terminal diseases started - CORRECT ANSWER-b) Total Dissolved Solids
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In drinking water regulations, the abbreviation "MCL" stands for?
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a) Maximum contaminant level
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b) Multiple constituent levels
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c) Most common level
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d) Minimum considered legal - CORRECT ANSWER-a) Maximum contaminant level
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The MBAS method is used to determine levels of which of the following drinking water
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constituents? - CORRECT ANSWER-Forming Agent
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In water quality, the symbol "mg/L" is equivalent to:
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a. Micrograms per liter Il` Il` Il`
,b. Parts per million Il` Il` Il`
c. Parts per billion Il` Il` Il`
d. Mostly good levels - CORRECT ANSWER-b) Parts per million
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The term "clearwell" refers to a? - CORRECT ANSWER-Reservoir at the outlet of a
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water treatment plant.
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A mechanical device often employed to prevent the over-filling and/ on over-draining of
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distribution system reservoir is the? - CORRECT ANSWER-Altitude Valve
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The primary cause of water quality deterioration in distribution system is? - CORRECT
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ANSWER-Water age
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The term "Springline" applies to? - CORRECT ANSWER-The midline of a pipeline
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When possible, a water main should be tapped while still pressurized to? - CORRECT
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ANSWER-Minimize contamination risk
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A connection made into a water main that is full of under pressure is called a?
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a. Cross connection
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b. Valve box Il` Il`
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c. Wet tap Il` Il`
d. Spinal tap - CORRECT ANSWER-c) Wet tap
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A special valve that is used almost exclusively to facilitate making connections to
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pipeline is the?
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a. Gate valveIl` Il`
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b. Corporation stop
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c. Altitude valve
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d. Auxiliary valve - CORRECT ANSWER-b) Corporation Stop
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Which of the following gases will deaden the sense of smell?
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a. Carbon dioxide
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b. Hydrogen sulfide
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c. Methane Il`
d. Oxygen - CORRECT ANSWER-b) Hydrogen Sulfide
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The most commonly used meter on small domestic services?
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a. Venturi meter Il` Il`
b. Propeller meter Il` Il`
c. Orifice plate meter Il` Il` Il`
d. Nutating disc meter - CORRECT ANSWER-d) Nutating Disk Meter
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A Nutating disk is found in certain?
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a. Positive displacement pumps Il` Il` Il`
b. Main line valves Il` Il` Il`
c. Chemical feeders Il` Il`
d. Water meters - CORRECT ANSWER-d) Water meters
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A pump is experiencing back-spin after it is shut down. What is the most likely cause? -
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, Il`
CORRECT ANSWER-Malfunction check valve
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When fully open, which of the following valve types will have the highest friction loss?
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a. Gate valve Il` Il`
b. Globe valve Il` Il`
c. Ball valve Il` Il`
d. All will have about the same friction loss. - CORRECT ANSWER-b) Globe valve
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The main purpose of a butterfly valve in a water distribution system is for? - CORRECT
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ANSWER-Isolation
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The most likely means of connecting two pressure zone is through a? - CORRECT
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ANSWER-Pressure reducing valve
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Which of the following devices is routinely used to reduce system pressure? -
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CORRECT ANSWER-Globe valve
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A venture or a weir is a device that is used to ? - CORRECT ANSWER-Measured water
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flow
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The most common valve in water distribution system is the? a.
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Gate valve
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b. Butterfly valve Il` Il`
c. Check valve Il` Il`
d. Globe valve - CORRECT ANSWER-a) Gate valve
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Venturi meters operate under the principle of? - CORRECT ANSWER-Pressure Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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differential
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An auxiliary valve is always located adjacent to a? - CORRECT ANSWER-Fire
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Hydrants
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If you encounter a liquid chlorine leak in a one-ton container. What action should you
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take first, to reduce the severity of the leak?
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a. Apply a caustic solution Il` Il` Il` Il`
b. Spray the container with water Il` Il` Il` Il` Il`
c. Spray the container with an ammonia solution Il` Il` Il` Il` Il` Il` Il`
d. Rotate the container to place the leak at the top - CORRECT ANSWER-d) Rotate the Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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container to place the leak at the top
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The most commonly used water disinfectant in the United States is?
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a. Chlorine Dioxide
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b. Ozone Il`
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c. Chlorine and Ammonia (chloramines)
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d. Chlorine - CORRECT ANSWER-d) Chlorine
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When collecting a distribution system sample, the water should be allowed to run for a
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period of time prior to sample collection. This period of time is?
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a. At least two minutes Il` Il` Il` Il`
b. At least five minutes Il` Il` Il` Il`
, c. At least thirty minutes Il` Il` Il` Il`
d. As long as necessary to permit clearing of the service line - CORRECT ANSWER-d) As
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long as necessary to permit clearing of the service line
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Sample bottles which are furnished by a certified laboratory for collection of Il` Il` Il`
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bacteriological same?
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a. Should be rinsed with the water to be sampled before use Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
b. Should be rinsed with a chlorine solution before use Il` Il` Il` Il` Il` Il` Il` Il` Il`
c. Should be rinsed with distilled water before use Il` Il` Il` Il` Il` Il` Il` Il`
d. Are ready to use - CORRECT ANSWER-d) Ready to use
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A device that automatically shuts off flow into an elevated storage tank when water level
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in the tank reaches a preset level is termed a?
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a. Air / vacuum relief valve
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b. Wet-barrel hydrant
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c. Altitude valve
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d. Angle valve - CORRECT ANSWER-c) Altitude valve
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red - CORRECT ANSWER-Electric Power line, Cable Conduit and Lighting
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Yellow - CORRECT ANSWER-Gas, Oil, Stream, Petroleum, or Gasesous Materials
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Orange - CORRECT ANSWER-Communications, Alarm or Signal Lines, or Conduit
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Purple - CORRECT ANSWER-Reclaimed Water, Irrigation, and Slurry Lines
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Blue - CORRECT ANSWER-Potable Water
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Green - CORRECT ANSWER-Sewers and Drain Lines
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Pink - CORRECT ANSWER-Temporary Survey Markings
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White - CORRECT ANSWER-Proposed Excavating
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The presence of coliform bacteria in a distribution system?
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a. Is positive proof that pathogenic organisms are present
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b. Requires the use of brilliant green bile as a secondary disinfectant Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
c. Indicates that pathogenic organisms may be present also Il` Il` Il` Il` Il` Il` Il` Il`
d. Has no particular significance - CORRECT ANSWER-c) Indicates that pathogenic
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organisms may be present also
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Most below-ground-level storage tanks are constructed of?
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a. Fiberglass Il`
b. Steel Il`
c. Concrete Il`
d. Special composite materials - CORRECT ANSWER-c) Concrete
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When fully open, which of the following will have the lowest friction loss?
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a. Gate valve Il` Il`
b. Butterfly valve Il` Il`
c. Globe valve Il` Il`
d. All will have about the same friction loss. - CORRECT ANSWER-a) Gate valve
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