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216 Cards in this Set
- Front
- Back
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A well should be located in an area that will not be contaminated by an identifiable source. Things that should be investigated include:
a Contour of the land b Porosity of the soil c Rock formation d All of the above |
d All of the above
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To whom should a well construction plan be submitted before well construction?
a. land owner b. state pollution control agency c. EPA d. State health department |
d. State health department
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What is a sieve-like device that has holes or other openings small enough to allow water to pass into the well but keeps sediment out of the well?
a. strainer b. trap c. percolator d. well screen |
d. well screen
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The large majority of the well screens in the bottom of the wells are made of what type of material?
a. stainless steel b. galvanized steel c. PVC d. rubber |
a. stainless steel
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What are the size of the openings on a well screen called?
a. permeable penetration b. granular grate c. slot size d. sieve size |
c. slot size
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In an artificial gravel-pack well, the formation material around the well screen is:
a Removed and replaced by coarser material b Removed and replaced with a sharp irrregular shaped stones c. Removed and replaced with limestone d All of the above |
a. Removed and replaced with coarser material.
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Grouting of a well refers to what?
a. Filling or sealing the outside casing to prevent contamination. b. Seal the well completely. c. Finish the cement flooring around the well so it slopes away. d. Place pea sized rock around the well for proper drainage. |
a. Filling or sealing the outside casing to prevent contamination.
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Well construction rules require that a water sample be taken and tested for what two things?
a. Sand and gravel b. Hardness and corrosiveness c. Percolation and rock formation d. bacteria and nitrates |
d. bacteria and nitrates
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Two purposes of storage tanks are to provide _______ and pressure.
a. clean water b. velocity c. volume d. demand |
c. volume
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________ water tanks are commonly used in providing pressure in a water system.
a. underground b. galvanized c. elevated d. potable |
c. elevated
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A common type of pressure tank used in a very small water system is called _____ .
a. Convenction tank b. Hydropneumatic tank c. Rapid mixing tank d. Break tank |
b. Hydropneumatic tank
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How should air and or vacuum relief valves be installed?
a. Below ground level b. On all of the high locations within the system c. at the highest location within the system d. in low drainage areas |
b. On all of the high locations within the system
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Cavitation in pumps may be caused by pumping:
a. Excessive amounts of abrasive solids. b. with impeller speed below manufacturer's recomendations. c. Against discharge heads higher than designed values. d. Flow rates considerably higher than design flows. |
d. Flow rates considerably higher than design flows.
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Static head is the:
a. energy of motion of the water b. pressure due to the depth of elevation of water c. All answers apply d. pressure loss in the line due to friction |
b. pressure due to the depth of elevation of water
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The peak capacity of water mains is often reduced by:
a. tuberculation b. high-pressure c. looping d. vacuum breakers |
a. tuberculation
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Corrosion can:
a. deteriorate pipe b. reduce pipe life c. corrode internally d. corrode externally e. reduce pipe carrying capacity f. all of the above |
f. all of the above
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True or False
Ductile iron and cast iron pipes are both considered brittle distribution piping. |
False
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Linings are used in pipe to...
a. strengthen pipe b. increase friction c. help prevent corrosion d. all of the above |
c. help prevent corrosion
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True or False
Lead and copper piping are still used today in water distribution. |
False
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Pipe corrosion will cause:
a. pipe failure b. wall thickness to be reduced c. potential for heavy materials to be carried in the pipe flow. d. all of the above |
d. all of the above
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True or False
Soil resistivity is the measurement of the potential of external corrosion on a pipe. |
True
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True or False
Low resistivity can mean the soil could be aggressive. |
True
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Ductile iron pipe constructed in soil with low resistivity:
a. should not be considered b. should be wrapped c.can be installed with no concern |
b. should be wrapped
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True or False
Plastic pipe is resistant to corrosion. |
True
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Soil resistivity measurement is to:
a. Help to determine pipe material selection b. determine potential for external corrosion. c. all of the above |
c. all of the above
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Protecting pipe from external corrosion includes:
a. wrapping b. cathotic protection c. pipe replacement with different materials d. all of the above |
d. all of the above
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Properties that affect internal pipe corrosion include:
a. velocity, temperature, dissolved oxygen, chlorine residual, chloride ions. b. velocity, water conductivity, chloramines. c. pipe conductivity, water conductivity, dissolved oxygen. |
a. velocity, temperature, dissolved oxygen, chlorine residual, chloride ions.
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True or False
Increases in dissolved oxygen will decrease corrosion in most metals |
True
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True or False
Increases in water temperature in most cases will increase metal corrosion. |
True
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How many gallons of water are in 1 cu. ft.?
a. 2 gallons/ cu. ft. b. 9.5 gallons/ cu. ft. c. 7.48 gallons/ cu. ft. d. 11.07 gallons/ cu. ft. |
c. 7.48 gallons/ cu. ft.
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Critical velocity in a water pipe is considered to be:
a. 2 ft. per sec b. 3 ft. per sec c. 4 ft per sec d 4.5 feet per sec. b. |
c. 4 ft per sec
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True or False
Pipe erosion and corrosion are virtually the same thing. |
False
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The most important factors influencing copper corrosion are:
a. pipe age, amount of bends in pipe, size of pipe. b. dissolved oxygen, pipe size, water temp. c. PH, dissolved oxygen, pipe age, water temp. d. dissolved oxygen, water temp., size of pipe |
c. PH, dissolved oxygen, pipe age, water temp.
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True or False
Green water or green plumbing fixtures are an indication of copper corrosion. |
True
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True or False
Pitting of copper pipe is an indication of hard water. |
True
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The critical PH level considered in lead corrosion is:
a. 7 b. 8 c. 9 d. 10 |
b. 8
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True of False
Microorganisms can contribute to corrosion in a water system. |
True
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The Langelier Index is a way to measure:
a. the coating ability of water b. the agressiveness of water c. all of the above d. none of the above |
c. all of the above
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Preventing corrosion includes:
a. PH adjustment b. chemical inhibitors c. electrochemical measures d. all of the above e. none of the above |
d. all of the above
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True or False
Phosphate addition prevents corrosion by laying down a film on the inside of a pipe and preventing contact of an aggressive water with the pipe. |
True
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Water with a high alkalinity and a PH above 8 can:
a. cause corrosion b. plug pipes over time c. have no affect on pipe d. none of the above |
b. plug pipes over time
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Common chemical inhibitors used in corrosion control practices include:
a polyphosphates b. orthophosphates c. silicates d. ortho-poly blends e. all of the above f. none of the above |
e. all of the above
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What happens when lime is fed to water for corrosion control?
a. alkalinity is decreased b. PH is increased c. CO2 does not change d. turbidity is decreased |
b. PH is increased
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For public water systems using surface and ground water under the influence of surface water turbidity must be measured atleast:
a. monthly b. every four hours c. daily d. weekly |
b. every four hours
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Hardness in water is caused by:
a. chloride and fluoride b. sodium and potassium c. alum d. calcium and magnesium |
d. calcium and magnesium
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True or False
drawdown refers to the drop in the water table in the ground when water is being pumped from a well. |
True
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True or false
Submersible pumps are never to be completely submerged in the fluid being pumped. |
False
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A pressure gage on a hydrant reads 80 ft. of pressure head. What is the pressure in PSI?
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Pressure, PSI = Pressure Head, ft.
80/2.31 ft/psi b. 34.6 psi |
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If excessively high pressures (greater than 100psi) cannot be avoided in commercial districts, ______ may be used.
a. thrust blocks b. pressure-reducing valves c. foot valves d. pressure gages |
b. pressure-reducing valves
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True or false
Drawdown refers to the amount of water used from a tank or resevoir, which is measured by the drop in the water level of a tank or resevoir. |
True
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A pressure gage on a fire hydrant reads 40psi. What is the pressure head in feet at the fire hydrant?
a. 35 ft b. 92.4 feet c. 70.1 feet d. 109.7 feet |
(Pressure, psi)(2.31 ft/psi)
(40 psi)(2.31 ft/psi) = b. 92.4 feet |
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In commercial districts, pressures of __ psi and higher are desirable.
a. 300 b. 255 c. 150 d. 75 |
d. 75
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The absolute minimum pressure of water should be delivered at is:
a. 100 psi b. 60 psi c. 20 psi d. 10 psi |
c. 20 psi
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Water should be delivered at a minimum desirable pressure of:
a. 100psi b. 35psi c. 65psi d. 10psi |
b. 35psi
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True or False
The higher the C-Factor, the smoother the inside of a pipe. |
True
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What is the purpose of adequate and reliable records?
a. to comply with paperwork reduction requirements. b. to document the effectiveness of the operation. c. to minimize record storage space. d. to record historical events. |
b. to document the effectiveness of the operation.
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The force exerted by the weight of the water stored in an elevated water tank is expressed in:
a. parts per million b. Milligrams per liter c. feet per second d. pounds per square inch |
d. pounds per square inch
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The volume of an elevated water tank should equal ___ usage of the water system.
a. 12 hours b. 2 days c. 5 days d. 24 hours |
d. 24 hours
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Which is not a typical method of storing water:
a. ground storage tanks b. sedimentation tanks c. elevated storage tanks d. hydropneumatic tanks |
b. sedimentation tanks
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A ground storage tank can become an elevated storage tank by placing it on a ___:
a. lake b. valley c. park d. hill |
d. hill
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True or False
Generally the trench should be no more than one or two feet wider than the outside diameter of the pipe. |
True
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True or False
Three valves should be used at crosses and two valves at tees. |
True
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True or False
Excavated soil is piled on the side of a trench 2 to 5 feet from the edge. For trenches deeper than 5 feet place the spoil 4 feet or more back from the edge of the trench. |
True
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True or False
Cathodic protection must not be regarded as a substitute for use of a proper interior coating or the application of inhibitors, but should be used if necessary to supplement the other methods. |
True
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True or False
When forced air is used, the air outlet and inlet shall be screened. |
True
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When natural aeration is used it should be screened to protect it from insects.
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True
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Hydrogen sulfide in water is a common problem and a common method of removing it from water is:
a. filtration b. lime c. settling d. aeration |
d. aeration
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When dissolved in water, methane gas from decomposition of organic matter tastes like:
a. cinnamin b. licorace c. garlic d. rotten egg |
c. garlic
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True or False
Hydrogen sulfide gas can be dangerous if inhaled in even low concentrations. |
True
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The Total Coliform Rule is based on:
a. the size of the coliform colony b. the presence or absence of coliform c. the number of coliform colonies d. all of the above |
b. the presence or absence of coliform
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Why is sodium thiosulfate added to a microbiological sample bottle?
a. to sterilize the bottle b. to remove any chlorine residual that may be present c. to aid in the digestion of the sample d. all of the above |
b. to remove any chlorine residual that may be present
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How full do you fill a sample bottle when collecting a sample for bacterial testing?
a. full to the top with no air bubbles. b. half full. c. within 1 inch of the top d. almost full |
c. within 1 inch of the top
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Which chemical is used to lower alkalinity?
a. hydrate lime b. carbon dioxide c. calcium hypochlorite d. sodium aluminate |
b. carbon dioxide
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Which chemical is used to increase alkalinity?
a. aluminum sulfate b. chlorine gas c. caustic soda d. sulfuric acid |
c. caustic soda
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Final determination of vulnerability is made by:
a. private contractor/consultants b. the water supplier c. all answers apply d. the primary agency |
d. the primary agency
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According to the lead and copper rule, the action level for the 90th percentile lead level is:
a. 0.030 mg/L b. 0.015 mg/L c. 0.005 mg/L d. 0.050 mg/L |
b. 0.015 mg/L
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A record containing the size, location and ties of water mains, valves, hydrants, tanks, reservoirs, and pump stations is called a:
a. road atlas b. comprehensive map c. system atlas d. charles atlas |
b. comprehensive map
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In the U.S., there are more miles of what type of pipe used in a water distribution system?
a. ductile iron b. asbestos cement c. cast iron d. steel pipe |
c. cast iron
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True or False
The use of lead joints is now prohibited. |
True
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Using cast iron pipe, which joint has become the most used in the last 40 years?
a. mechanical b. bell c. spigot |
a. mechanical
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Ductile iron pipe was introduced in the 1950s to replace which type of pipe?
a. asbestos cement b. cast iron c. steel d. plastic |
b. cast iron
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True or False
All new water mains must be pressure tested and disinfected. |
True
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True or False
All new water mains are allowed leakage. |
True
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True or False
Coliform water samples are required to pass a new water main. |
True
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How many negative coliform samples are required to pass a new water main?
a. one b. two c. three d. four |
b. two
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What type of valve is most commonly used in a distribution system?
a. butterfly b. globe c. gate |
c. gate
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Two pumps of the same flow capicity and pressure rating that are pipe in series would result in:
a. double the flow, same head. b. double the discharge head c. double the flow and head. d. heating of the pipes |
b. double the discharge head
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Booster pumps are normally used for which situation?
a. pump water from the plant to the distribution system. b. increase water pressure in the distribution system. c. pump water from the source to the plant. |
b. increase water pressure in the distribution system.
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When do pumps and motors in a water system need maintenance?
a. on a regular basis b. never needs to be done c. only when it breaks down |
a. on a regular basis
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Positive displacement pumps are commonly used to produce what?
a. a higher pressure b. a lower pressure c. not used in water |
a. a higher pressure
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In selecting a pump which one piece of information is needed?
a. draw down b. static discharge head c. total dynamic head |
c. total dynamic head
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Which one of the following is found on a pump curve?
a. size of impeller b. where the pump was made. c. which type of fluid can be pumped. |
a. size of impeller
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True or False
1 foot of water = 0.433 psi |
True
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When is a hydropneumatic pressure tank generally used?
a. to maintain pressure in a small water system b. to provide pressure for fire protection c. to maintain pressure for large water systems. d. to maintain pressure in a medium sized water system. |
a. to maintain pressure in a small water system
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What does it mean if the C Value of the pipe is high?
a. the smoother the interior of the pipe is. b. the easier corrosion will adhere to the inside of the pipe. c. the pipe is stronger. d. the more resistant to corrosion the pipe is. |
a. the smoother the interior of the pipe is.
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What type of valve is usually installed on a storage reservoir to prevent overflows?
a. regulating valve b. altitude valve c. limiting valve d. globe valve |
b. altitude valve
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How do you seal a bell or spigot joint on PVC pipe?
a. use a heat-welding compound. b. use an O-ring c. use a solvent cleaner and glue d. use a flame |
b. use an O-ring
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What type of valve is raised and lowered by a screw which is operated by a handwheel or valve key?
a. rotary valve b. globe valve c. diaphram valve d. gate valve |
d. gate valve
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Which one would be a good example of a verticle turbine pump?
a. centrifugal pump b. positive displacement pump c. chemical feed pump |
a. centrifugal pump
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True or False
When a pump is properly packed it should never leak a drop. |
False
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Occurs when the pressure of the non-potable system exceeds the positive pressure in the water distribution lines.
a. cross connection b. back-flow c. back-siphonage d. back pressure. |
d. back pressure.
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Undesired reverse flow of a liquid in a piping system.
a. cross connection b. back-flow c. back-siphonage d. back-pressure |
b. back-flow
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Occurs when there is a partial vacuum (negative pressures) in a water supply system, drawing the water from a contaminated source into the potable water supply.
a. cross connection b. back-flow c. back-siphonage d. back-pressure |
c. back-siphonage
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A direct connection of a non-potable source with a potable source:
a. cross connection b. back-flow c. back-siphonage d. back pressure |
a. cross connection
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Which of the following is the most reliable backflow prevention measure?
a. atmospheric vacuum breaker b. double check valve assemblies c. reduced pressure principal backflow prevention assemby (RPZ) d. air gap e. pressure type vacuum breaker assembly |
d. air gap
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Reduced pressure zone backflow prevention devices should be inspected annually and overhauled every __ year(s).
a. 1 b. 3 c. 5 d. 10 |
c. 5
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When using an air gap to provide protection from a cross connection, the vertical distance between the supply pipe and the flood level rim should be __ times the diameter of the supply pipe but never less than one inch.
a. 0.5 b. 1.0 c. 1.5 d. 2.0 |
d. 2.0
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A prevealent type of cross connection is illustrated by a hose connected to a sillcock with the other end lying in a sink pull of polluted or contaminated water. In this case, backflow occurs by:
a. back pressure b. back siphoage |
b. back siphoage
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A cross connection to an elevated tank containing a non-potable substance can cause backflow by:
a. back pressure b. back siphonage |
a. back pressure
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The type of fire extinguisher needed for wood, paper, textiles and similar fires:
a. class A - foam, water or cabon dioxide gas. b. class B - foam, dry chemical, vaporizing liquid c. class C - carbon dioxide, dry chem, vaprozing liquid d. any of the above |
a. class A - foam, water or cabon dioxide gas.
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One HP (horse power) is defined as 33,000 ft-lbs per minute or 746 watts.
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True
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Static head is defined as the:
a. pressure created by the atmosphere b. the energy of motion of the water c. pressure due to depth or elevation of water d. pressure loss in a waterline dur to friction. |
c. pressure due to depth or elevation of water
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When flushing water mains, what should be the minimum flushing velocity?
a. 1.0 ft/sec b. 1.5 ft/sec c. 2.0 ft/sec d. 2.5 ft/sec |
d. 2.5 ft/sec
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Shoring requirements depend on which one of the following?
a. local activities b. soil conditions c. depth of the trench d. all of the above |
d. all of the above
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Which valve is primarily used as a control valve?
a. globe b. butterfly c. gate d. none of the above |
b. butterfly
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Steel specimens called "coupons" are used in water mains to:
a. measure water hammer b. declare chlorine residuals c. record water flow d. measure corrosion rates |
d. measure corrosion rates
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What is the term used for electrical pressure that causes current to flow through wires?
a. amperage b. wattage c. voltage d. ohms |
c. voltage
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What is the term used for how hard the electricity is working?
a. amperage b. wattage c. voltage d. ohms |
a. amperage
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Direct current that is used in a water system:
a. flows in one direction only b. flows in any direction c. is equal to the amount of electricity used. d. never has a positive or negative point. |
a. flows in one direction only
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Alternating Current that is used in a water system:
a. flows in one direction only b. flows in any direction c. is equal to the amount of electricity used d. never has a positive or negative point |
b. flows in any direction
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Compound meters are generally used when water flows:
a. fluctuate b. are slow moving c. very fast d. none of the above |
a. fluctuate
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"Pigging" or "swabbing" in a distribution system means:
a. mopping the floor of the booster station b. cleaning around valve boxes c. removing accumulated debris from inside water mains. d. all of the above |
c. removing accumulated debris from inside water mains.
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Which of the following should not be performed on a fire hydrant?
a. painting b. throttling the flow c. standing behind the hydrant to open it d. lubrication |
b. throttling the flow
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When repairing water mains you should:
a. spray everything that could come in contact with the water with alcohol to disinfect it. b. test water for coliform after leak is repaired. c. never flush once it's repaired d. keep all water, dirt and debris in the ditch to avoid contamination. |
b. test water for coliform after leak is repaired.
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A voltage tester can be used to test for:
a. blown fuses b. open circuits c. voltage d. all of the above |
d. all of the above
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If 360 gpm was flowing through two different sized water mains, one being a 16" main and the other being an 8" main, friction loss would be:
a. higher than the larger main b. the same c. lower than the larger main d. twice as much in the larger main |
c. lower than the larger main
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The pressure within a water main may be affected by the:
a. water color and temperature b. friction loss and elevation c. turbidity and C-Factor d all of the above |
b. friction loss and elevation
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The purpose of the "Lock Out Tag Out" system is to:
a. prevent equipment from being operated. b. keep people out of the electrical room. c. Lock a specific device so that it is not stolen. d. prevent theft |
a. prevent equipment from being operated.
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When trying to achieve optimal water quality, what should be considered?
a. system looping b. system flushing c. system pressure d. all of the above |
d. all of the above
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The most accurate way to deliver accurate volumes of a sample is to use:
a. a beaker b. a graduate cylinder c. a pipette d. a flask |
c. a pipette
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If a pressure gage reads 155psi what would the pressure head be in feet?
a. 358 feet b. 253 feet c. 494 feet d 566 feet |
a. 358 feet
(155)(2.31)=358 |
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If a pressure gage on a pump reads 358 feet, how much pressure in PSI would be on the pump?
a. 200psi b. 155psi c. 90 psi d. 36 psi |
b. 155psi
(358)(0.433)=155psi |
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If a pressure gage on a pump reads 253 feet, how much pressure in PSI would be on the pump?
a. 155 psi b. 110 psi c. 494 psi d. 566 psi |
b. 110 psi
(253feet)(0.433psi)=110psi |
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In order to provide an adequate level of protection against the developement of tastes and odors in a distribution system it is important that the system be:
a. properly flushed b. routinely sampled for taste and odor c. taste and odor are not of any concern d. both a and b |
d. both a and b
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What mineral is found in water that causes blackish staining of fixtures?
a. manganese b. iron c. rock salt |
a. manganese
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What does VOC stand for?
a. Very Ordinary Chemicals b. Volatile Organic Chemicals c. Very Old Chemicals |
b. Volatile Organic Chemicals
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True or False
There is more dissolved oxygen in cold water than in warm. |
True
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Excessive amounts of fluoride in drinking water can cause:
a. dysentery b. pipe corrosion c. mottling of teeth d. memory loss |
c. mottling of teeth
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What does the term "Cathodic protection" mean?
a. protection against corrosion b. protection against hardness c. protection against bacteria d. protection against contamination |
a. protection against corrosion
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Which of the following can be used to measure corrosion tendencies?
a. corrosion coupons, orthophosphate concentrations and iron concentrations. b. Henry's Constant, ,mean velocity gradient and nitrate c. CT, K Factor and sulfate concentration. d. Manganese concentration, magnesium rid testing and fluoride concentration. |
a. corrosion coupons, orthophosphate concentrations and iron concentrations.
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A portion of cast iron pipe after 5 years of use shows a white colored scale one half inch thick on the inside pipe walls. This means that:
a. water has been very corrosive b. the water is chemically unstable and depositing calcium carbonate. c. C-Factor should increase due to lining effect. d. red water will soon become a problem. |
b. the water is chemically unstable and depositing calcium carbonate.
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If a storage tank, which is completely full contains 37 feet of water, what would the pressure gauge read which is located 5 feet above the bottom of the tank?
a. 3.5 psi b. 6.2 psi c. 13.9psi d. 32.1 psi |
c. 13.9psi
(32ft)(0.433psi)=13.9 psi |
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Brake horsepower is:
a. the power delivered by the motor to the pump. b. the power delivered by the pump c. always greater than the motor horsepower d. always less than the motor horsepower |
a. the power delivered by the motor to the pump.
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The velocity of flow in water mains is directly related to the___:
a. flow rate in GPM and cross sectional area of the pipe. b. C Factor and type of pipe. c. dynamic pressure head and water velocity. d. specific gravity and density of water. |
a. flow rate in GPM and cross sectional area of the pipe.
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A dynamic suction lift plus dynamic discharge head of a pump is equal to:
a. the operating level b. the total dynamic head c. the dynamic suction head d. the total static head |
b. the total dynamic head
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What are check valves used for in a water distribution system?
a. stop the water flow in both directions b. stop the water flow in one direction c. regulate flow through the distribution system d. regulate pressure throughout the system. |
b. stop the water flow in one direction
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How is velocity of water flow normally expressed?
a. feet per second (FPM) b. gallons per minute (GPM) c. Liters per inch (LPI) d. feet per second (FPS) |
d. feet per second (FPS)
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Regulations generally require trench wall protection for all trenches deeper than:
a. 2 - 3 feet b. 4 - 5 feet c. 1 - 2 feet d. 6 feet or more |
b. 4 - 5 feet
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What are the "Action Levels" for lead and cooper within a distribution system?
a. 0.015mg/L for lead, 1.3mg/L for copper. b. 0.015mg/L for copper, 1.3mg/L for lead c. 0.15mg/L for lead, 13mg/L for copper |
a. 0.015mg/L for lead, 1.3mg/L for copper.
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If water has a PH of below 6.2 it could indicate what?
a. corrosive water b. high levels of dissolved solids c. high alkalinity d. high temperature |
a. corrosive water
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If 5.0 mg/L of chlorine is added to water and the free chlorine residual of 2.3 mg/L is maintained after 60 minutes, the CT at that point is:
a. 22.6 mg/L - minutes b. 350 mg/L - minutes c. 138 mg/L - minutes d. 258 mg/L - minutes |
c. 138 mg/L - minutes
(2.3mg/L)(60mins)=138 |
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If an operator discovers a chlorine leak at the tank, the operator should
a. crawl out of the room ASAP b. keep head as high as possible, hold breath, leave the room and get help. c. pull shirt over head, hold breath and leave d. seal the leak with ammonia vapor |
b. keep head as high as possible, hold breath, leave the room and get help.
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Why are thrust blocks used when laying distribution system piping?
a. to help flexible joint move easier b. increase water velocity c. lower PH d. prevent movement of pipes |
d. prevent movement of pipes
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Chlorine gas is:
a. lighter than air b. the same weight as air c. heavier than air |
c. heavier than air
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What type of water meter is used in household applications?
a. velocity b. displacement c. compound d. ventur |
b. displacement
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When installing water mains, where should the corporation stop be placed into the main?
a. on the top b. on the side c. on the bottom d. on the end |
b. on the side
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What is a safe minimum chlorine residual in a distribution system?
a. 0.3 mg/L b. 0.5 mg/L c. 0.05 mg/L d. 0.2 mg/L |
d. 0.2 mg/L
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How many pounds of water are in a standpipe containing 1,500 gallons of water?
a. 11,200 lbs b. 12, 510 lbs c. 4,710 lbs d. 1,178 lbs |
b. 12, 510 lbs
(1,500gallons)(8.34lbs)= 12, 510 lbs |
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The minimum water pressure at ground level at all points in the distribution system under all flow conditions must be:
a. 50psi b. 40psi c. 30psi d. 20psi |
d. 20psi
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The hydraulic grade line always slopes:
a. downward in the direction of the flow b. upward in the direction of flow c. downward against the flow d. upward against the flow |
a. downward in the direction of the flow
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One foot of water is:
a. 0.433 psi b. 4.14 psi c. 1 psi d. 100 psi |
a. 0.433 psi
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During a routine pressure test of a fire hydrant the gauge reads 66 psi. What is the pressure head in feet?
a. 29 feet b. 152 feet c. 494 feet d. 56 feet |
b. 152 feet
(66psi)(2.31) |
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What is the most probable cause of a rumbling, popping or grinding sound coming from a pump?
a. cavitation b. corrosion c. hardness d. descaling |
a. cavitation
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What are the two major requirements used when sizing a service line to a household?
a. flow rate and elevation b. corrosion and PH c. flow rate and volume d. flow rate and pressure |
d. flow rate and pressure
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True or False
There are 7.48 gallons of water in a cubic foot. |
True
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Valves in a distribution system should be exercised atleast:
a. quarterly b. monthly c. yearly d. semi-annually |
c. yearly
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Drought contingency plans should be reviewed and revised atleast:
a. quarterly b. monthly c. yearly d. semi-annually |
c. yearly
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How often should fire hydrants generally be operated and maintained?
a. quarterly b. monthly c. yearly d. twice a year |
d. twice a year
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If a routine sample is found to contain total coliform, which of the following actions must be taken?
a. run the HPC or ONPG test b. run the SPC or HPC test c. run the EMB or ONPG test d. run the fecal coliform or E coli test |
d. run the fecal coliform or E coli test
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Which is the number of total coliform samples collected each month in a distribution system based on?
a. type of water source used b. type of water treatment used c amount of water purchased d. population served |
d. population served
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The difference between the amount of chlorine added to water and the amount of residual chlorine remaining at the end of a specific period is:
a. dosage b. free available chlorine c. chlorine residual d. chlorine demand |
d. chlorine demand
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A chlorine cylinder valve appears to be leaking. If ammonia vapor is passed near the valve the presence of a leak would be indicated by:
a. a loud noise b. white vapor c. black smoke d. a flash of light |
b. white vapor
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The combined chlorine residual in a sample which contains 3.4 mg/L of total chlorine residual and 2.3 mg/L of free chlorine residual is:
a. 3.4 mg/L b. 1.1 mg/L c. 4.5 mg/L d. 2.0 mg/L |
b. 1.1 mg/L
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What is the chlorine demand if the residual is 1.2 mg/L and 4.7 mg/L of chlorine has been added?
a. 5.3 mg/L b. 1.2 mg/L c. 4.7 mg/L d. 3.5 mg/L |
d. 3.5 mg/L
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The free chlorine residual in water is the amount of:
a. chlorine applied as measured in mg/L b. chlorine in raw water c. chlorine in water d. uncombined chlorine that remains in the water after the chlorine has been applied and allowed to react. |
d. uncombined chlorine that remains in the water after the chlorine has been applied and allowed to react.
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True or False
Reducing the electric current and water surge on start up can be done by starting the pump with discharge valve closed or throttled and then opening discharge valve slowly as soon as the pump is running. |
True
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True or False
The period of time of lowest water consumption for most water utilities in warmer climates is from october to april. |
True
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One gallon of water weighs:
a. 4 lbs b. 8,34 lbs c. 10 lbs |
b. 8,34 lbs
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Any water with a chlorine residual of __ mg/L or more must be deluted with water or properly neutralized before being discharged into the environment.
a. 10 mg/L b. 2 mg/L c. 7mg/L |
b. 2 mg/L
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Water should be delivered at a minimum desirable pressure of:
a. 35psi b. 95psi c. 100psi d. 200psi |
a. 35psi
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An absolute minimim pressure is __ psi to all points of the distribution system.
a. 20psi b. 40psi c. 60psi d. 80psi |
a. 20psi
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True or False
Steel cylinder concrete pipe is normally joined using a modified bell and spigot. |
True
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True or False
Disease-producing organisms in water are also known as waterborne pathogens. |
True
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The ___ group of bacteria is an indicator that one or more pathogens may be present in the drinking water.
a. total colilert b. total cholera c. total coliform |
c. total coliform
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Sodium Thiosulfate is used in water sample containers to:
a. sterilize the sample container b. oxidize iron c. oxidize manganes d. neutralize the chlorine in the water sample |
d. neutralize the chlorine in the water sample
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True or False
When taking a sample for bacteria analysis, it's advisable to take a hot water sample and let the water run for 5 - 6 minutes. |
False
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Any routine or repeat samples that are found to be positive for Total Coliform Bacteria must be analyzed for:
a. Iron b. Chlorine Residual c. E-Coli or Fecal Coliform d. Sodium Thiosulfate |
c. E-Coli or Fecal Coliform
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True or False
The total coliform group of bacteria is found in the soil and in the waste of warm-blooded animals. |
True
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Typically water system customers judge the quality of water by:
a. color b. taste c. asthetics d. all of the above |
d. all of the above
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If the water taste changes the customer will call the supplier and complain that the water is:
a. not worth paying for b. contaminated c. not good enough for minnows d. making him sick |
b. contaminated
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Most taste and odors in surface water are derived from algae blooms and are:
a. organic b. inorganic |
a. organic
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Water that has rotten egg smell usually has a high amount of:
a. sulfer b. hydrogen sulfide c. iron magnus d. magnesium |
b. hydrogen sulfide
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What involves the prevention of contaminants from entering the groundwater source?
a. fencing b. well head protection c. gates d. aqua defender |
b. well head protection
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If preventive measures used on the water sources are ineffective, the taste and odor must be controlled:
a. underground b. at the treatment plant c. reservoir d. recirculation in the reservoir |
b. at the treatment plant
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Any connection between a potable water system and any source of contamination through which contaminated water could enter the potable water system is:
a. backflow b. cross-connection c. back siphonage d. back pressure |
b. cross-connection
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A valve which is activated by water pressure from a reservoir to close automatically when the reservoir is full is:
a. pressure reducing valve b. pressure relief valve c. air and vacuum valve d. altitude valve |
d. altitude valve
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Which of the following is the best to prevent back siphonage?
a. check valve b. reduced pressure zone device c. air gap d. double backflow protector |
c. air gap
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A process that gradually constricts flow and causes water discoloration due to corrosion can be referred to as:
a. transduced b. plasticitis c. iron infestation d. tuberculation |
d. tuberculation
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If a pressure gage on a fire hydrant reads 394 feet, what is the pressure head in psi?
a. 170 psi b. 910 psi c. 394 psi d. 155 psi |
a. 170 psi
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What occurs in the distribution system which is a primary result of corrosion of pipe material and /or growth of iron bacteria?
a. taste and odor b. main breaks c. maintain pressure d. old water mains |
a. taste and odor
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Taste and odor problems can be eliminated by adequate means of doing what in the system?
a. keeping the tower full b. flushing c. maintain pressure d. valve exercise program |
b. flushing
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Water treatment plants can also minimize taste and odor problems by managing an adequate:
a. chlorine residual b. recirculation rates c. positive pressure d. pump maintenance program |
a. chlorine residual
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How many feet above the highest known flood record should the floor of the well house be at a minimum?
a. 1 foot b. 2 feet 6 inches c. 5 feet d. 10 feet |
a. 1 foot
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All storage reservoirs shall have an overflow brought down to an elevation of
a. 12 - 24 inches b. 36 - 48 inches c. 48 - 60 inches d. 60 - 72 inches |
a. 12 - 24 inches
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The minimum working pressure in the distribution system should be __ psi.
a. 20 b. 35 c. 50 d. 65 |
b. 35
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The minimum working pressure in the distribution system should be 35 psi and the normal working pressure should be approximately __ and __ psi.
a. 20 and 30 b. 40 and 50 c. 60 and 80 d. 80 and 100 |
c. 60 and 80psi
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Newly installed piping should be pressure tested for leaks and disinfected with 50ppm of free chlorine for how many hours before being flushed, tested for bacteriological safety and put into service?
a. 4 b. 8 c. 12 d. 24 |
d. 24 hours
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The best way to eliminate a cross connection is to
a. not have threads on a fill pipe b. charge higher rates c. have an honor system d. have an air gap fill system |
d. have an air gap fill system
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Water mains should be tested at 150 psi for leaks and not drop more than 2 psi in the last __ hour(s)
a. 1 b. 12 c. 24 d. 72 |
a. 1 hour
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Water mains should be laid atleast how many feet horizontally from a gravity sanitation sewer, storm sewer or septic manhole whenever possible?
a. 10 feet b. 20 feet c. 30 feet d. 50 feet |
a. 10 feet
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The grade around a well house shall slope away from the well so that water will not pond within how many feet of the well?
a. 10 b. 50 c. 100 d. 200 |
b. 50 feet
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How many inches above the final grade or above the finished floor elevation shall well casings extend vertically?
a. 24 inches b. 12 inches c. 48 inches d. 60 inches |
b. 12 inches
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One psi is __ feet of water
a. 8.34 b. 4.33 c. 2.31 d. 7.48 |
c. 2.31 feet of water
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What can poorly constructed wells do to aquifers and the water source?
a. contaminate b. let the aquifer breathe c. open a hole for fossil exploration d. none of the above |
a. contaminate
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What should be considered when deciding on a well site? Location and proximity to what?
a. Existing water tower and treatment plant b. public school c. mayor's home d. none of the above |
a. Existing water tower and treatment plant
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What is the psi of 1 foot of water?
a. 7.48 b. 0.433 c. 8.34 d. 2.31 |
b. 0.433
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