Water Distribution Exam 2024 Questions and Answers 100% Accurate., Exams of Water Resources Planning and Management

Download Water Distribution Exam 2024 Questions and Answers 100% Accurate. and more Exams Water Resources Planning and Management in PDF only on Docsity!

Water Distribution Exam 2024 Questions

and Answers 100% Accurate.

Potable water may be defined as: a. Any water that occasionally may be polluted from another source b. Any water that, according to recognized standards, is safe for consumption c. Water high in organic content d. Water that has been transported from outside the service area - ANSWER-b). Any water that according to recognized standard is safe for human consumption. To prevent the entry of surface contamination into a well is the purpose of: a. The well casing b. The louvers or slots c. Well development d. The sanitary seal - ANSWER-d) The Sanitary Seal Pure water will exhibit a pH value of? a. 0. b. 7. c. 10. d. 14.0 - ANSWER-b) 7. A pH reading of 6.0 units indicates that the water sample is: a. Very acidic b. Slightly alkaline c. Very alkaline d. Slightly acidic - ANSWER-d) Slightly Acidic In drinking water quality, "TDS" is the abbreviation for? a)Total digestable substances b) Total dissolved solids c) Time-delayed sicknesses d) Terminal diseases started - ANSWER-b) Total Dissolved Solids In drinking water regulations, the abbreviation "MCL" stands for? a) Maximum contaminant level

b) Multiple constituent levels c) Most common level d) Minimum considered legal - ANSWER-a) Maximum contaminant level The MBAS method is used to determine levels of which of the following drinking water constituents? - ANSWER-Forming Agent In water quality, the symbol "mg/L" is equivalent to: a. Micrograms per liter b. Parts per million c. Parts per billion d. Mostly good levels - ANSWER-b) Parts per million The term "clearwell" refers to a? - ANSWER-Reservoir at the outlet of a water treatment plant. A mechanical device often employed to prevent the over-filling and/ on over-draining of distribution system reservoir is the? - ANSWER-Altitude Valve The primary cause of water quality deterioration in distribution system is? - ANSWER- Water age The term "Springline" applies to? - ANSWER-The midline of a pipeline When possible, a water main should be tapped while still pressurized to? - ANSWER- Minimize contamination risk A connection made into a water main that is full of under pressure is called a? a. Cross connection b. Valve box c. Wet tap d. Spinal tap - ANSWER-c) Wet tap A special valve that is used almost exclusively to facilitate making connections to pipeline is the? a. Gate valve b. Corporation stop c. Altitude valve d. Auxiliary valve - ANSWER-b) Corporation Stop Which of the following gases will deaden the sense of smell? a. Carbon dioxide

b. Hydrogen sulfide c. Methane d. Oxygen - ANSWER-b) Hydrogen Sulfide The most commonly used meter on small domestic services? a. Venturi meter b. Propeller meter c. Orifice plate meter d. Nutating disc meter - ANSWER-d) Nutating Disk Meter A Nutating disk is found in certain? a. Positive displacement pumps b. Main line valves c. Chemical feeders d. Water meters - ANSWER-d) Water meters A pump is experiencing back-spin after it is shut down. What is the most likely cause? - ANSWER-Malfunction check valve When fully open, which of the following valve types will have the highest friction loss? a. Gate valve b. Globe valve c. Ball valve d. All will have about the same friction loss. - ANSWER-b) Globe valve The main purpose of a butterfly valve in a water distribution system is for? - ANSWER- Isolation The most likely means of connecting two pressure zone is through a? - ANSWER- Pressure reducing valve Which of the following devices is routinely used to reduce system pressure? - ANSWER-Globe valve A venture or a weir is a device that is used to? - ANSWER-Measured water flow The most common valve in water distribution system is the? a. Gate valve b. Butterfly valve c. Check valve d. Globe valve - ANSWER-a) Gate valve Venturi meters operate under the principle of? - ANSWER-Pressure differential

An auxiliary valve is always located adjacent to a? - ANSWER-Fire Hydrants If you encounter a liquid chlorine leak in a one-ton container. What action should you take first, to reduce the severity of the leak? a. Apply a caustic solution b. Spray the container with water c. Spray the container with an ammonia solution d. Rotate the container to place the leak at the top - ANSWER-d) Rotate the container to place the leak at the top The most commonly used water disinfectant in the United States is? a. Chlorine Dioxide b. Ozone c. Chlorine and Ammonia (chloramines) d. Chlorine - ANSWER-d) Chlorine When collecting a distribution system sample, the water should be allowed to run for a period of time prior to sample collection. This period of time is? a. At least two minutes b. At least five minutes c. At least thirty minutes d. As long as necessary to permit clearing of the service line - ANSWER-d) As long as necessary to permit clearing of the service line Sample bottles which are furnished by a certified laboratory for collection of bacteriological same? a. Should be rinsed with the water to be sampled before use b. Should be rinsed with a chlorine solution before use c. Should be rinsed with distilled water before use d. Are ready to use - ANSWER-d) Ready to use A device that automatically shuts off flow into an elevated storage tank when water level in the tank reaches a preset level is termed a? a. Air / vacuum relief valve b. Wet-barrel hydrant c. Altitude valve d. Angle valve - ANSWER-c) Altitude valve red - ANSWER-Electric Power line, Cable Conduit and Lighting

Yellow - ANSWER-Gas, Oil, Stream, Petroleum, or Gasesous Materials Orange - ANSWER-Communications, Alarm or Signal Lines, or Conduit Purple - ANSWER-Reclaimed Water, Irrigation, and Slurry Lines Blue - ANSWER-Potable Water Green - ANSWER-Sewers and Drain Lines Pink - ANSWER-Temporary Survey Markings White - ANSWER-Proposed Excavating The presence of coliform bacteria in a distribution system? a. Is positive proof that pathogenic organisms are present b. Requires the use of brilliant green bile as a secondary disinfectant c. Indicates that pathogenic organisms may be present also d. Has no particular significance - ANSWER-c) Indicates that pathogenic organisms may be present also Most below-ground-level storage tanks are constructed of? a. Fiberglass b. Steel c. Concrete d. Special composite materials - ANSWER-c) Concrete When fully open, which of the following will have the lowest friction loss? a. Gate valve b. Butterfly valve c. Globe valve d. All will have about the same friction loss. - ANSWER-a) Gate valve Enclosed, open, and semi-closed are terms used for the designation and selection of? a. Impellers b. Lantern rings c. Sleeves d. Stuffing boxes - ANSWER-a) Impellers "Blackflow Device" is a term used to describe a device that? a. connects three inlet lines with one outlet line

b. lets air into valve vaults c. prevents backflow of potentially contaminated source into drinking water d. prevents backflow of water through an out-of-service pump - ANSWER-c) Prevents backflow of potentially contaminated source into drinking water A compound meter is a device which? a. Is installed to allow automated meter reading b. Can be installed to measure water use by as many as 12 separate customers c. Provides accurate readings over a wide range of flows d. Is a typical residential water flow meter - ANSWER-c) Provides accurate reading over a wide range of flows Which of the following is a positive displacement pump? a. Air lift pump b. Centrifugal pump c. Reciprocating pump d. Turbine pump - ANSWER-c) Reciprocating pump What information must be on a warming tag attached to a locked-out switch? a. Directions for removing the tag b. Name of the nearest physician to call in case of an emergency c. Signature of the person who locked out the switch and who will remove it d. Time to unlock the switch - ANSWER-c) Signature of the person who locked out the switch and who will remove it A chlorine leak can be detected by? a. An explosimeter b. Checking the leak gauge c. Applying ammonia vapor d. A tri-gas detector - ANSWER-c) Applying ammonia vapor Red water problems are due primary to? a. Hardness b. Hydrogen sulfide c. Iron d. Turbidity - ANSWER-c) Iron When testing a distribution system for chlorine residual, you should? a. Test samples from several different points b. Test a sample from one point several times

c. Have a sample volume of at least 100 mL which is taken back to the laboratory d. Use the ortho-tolidine method - ANSWER-a) Test samples from several different points A normal buried valve located on a street water main and leading to a water service is known as a? a. Gate valve b. Corporation stop c. Altitude valve d. Auxiliary valve - ANSWER-b) Corporation Stop The fusible plug that is in all chlorine containers? a. May be used as a tap for the chlorine source b. Should be removed after the cylinders are empty c. Should never be removed or tampered with d. Should be removed prior to withdrawing chlorine from the container - ANSWER-c) Should never be removed or tampered with An example of a pressure-differential type water is a? a. Venturi meter b. Propeller meter c. Nutating disk meter d. Magnetic flow meter - ANSWER-a) Venturi meter The only blackflow prevention device approved for all application is the? a. Double check valve b. Triple check valve c. Reduced pressure zone device d. Pressure vacuum breaker - ANSWER-c) Reduced pressure zone device A new water main should be flushed, disinfected at 50 mg/L, and held at above 25 mg/L for at least? a. 12 hours b. 24 hours c. 36 hours d. 48 hours - ANSWER-b) 24 hrs A cross-connection means? a. Four pipelines tied together b. A T-shaped tool

c. A connection between potable water and "unapproved" water supplies d. A connection between two or more pressure zones - ANSWER-c) A connection between potable water and "unapproved" water supplies The packing gland serves many functions in a centrifugal pump. Among these, it Keeps gritty material from entering the? a. Acts as a coolant to keep the pump bearing from overheating b. Keeps gritty material from entering the packing box c. Keeps the pump primed d. Prevents cavitation - ANSWER-c) Keeps gritty material from entering the packing box. The rotating element in a centrifugal pump is commonly called the? a. Impeller b. Rotor c. Volute d. Stator - ANSWER-a) Impeller A water-bearing formation in the soil is referred to as? a. An aquitard b. An aquifer c. The drawdown d. The static water level - ANSWER-a) An aquifer The bubbles formed in a positive multiple tube fermentation test are? a. Oxygen b. Chloramines c. Hypochlorous acid d. Carbon dioxide - ANSWER-d) Carbon Dioxide The distance between the static water level and the pumping water level is termed the? a. Radius of influence b. Drawdown c. Sanitary seal d. Water table - ANSWER-b) Drawdown. Entry into an atmosphere with high concentrations of chlorine gas requires? a. A self-contained breathing apparatus b. An approved and uncontaminated canister mask c. Forced ventilation of the work area

d. Atmospheric testing with ammonia solution prior to entry - ANSWER-a) A self- contained breathing apparatus. The height to which water will rise in wells located in an artesian aquifer is called the? a. Pumping water level b. Piezometric surface c. Drawdown d. Radius of influence - ANSWER-b) Piezometric Surface. Hardness in water is due to dissolved? a) Calcium and magnesium b) Sodium and potassium c) Chlorides and carbonates d) Organic matter - ANSWER-a) Calcium and Magnesium. A primary drinking water regulation is based upon? a) Health effects b) Patent laws c) Appearance and aesthetic issues d) Lowest cost of treatment - ANSWER-a) Health effects. Algae growth in untreated surface water reservoirs can be reduced by applying? a) Ferric chloride b) Caustic soda c) Citric acid d) Copper sulfate - ANSWER-d) Copper Sulfate. The layer of a stratified lake that is most likely to be impacted by algae is called the? a) Epilimnion b) Hypolimnion c) Thermocline d) Transition zone - ANSWER-a) Epilimnion. Secondary drinking water standards are generally based upon? a) Public health impacts b) Microbiological constituents c) Organic compounds d) Aesthetic properties - ANSWER-d) Aesthetic Properties. An aquifer is usually composed of?

a) Sand and gravel b) Clays and silts c) Bedrock d) Large voids in the soil, resembling underground lakes - ANSWER-a) Sand and Gravel. A clay layer in the soil resists the flow of groundwater. Such a layer is called? a) An aquifer b) A Piezometric surface c) Artesian d) An aquitard - ANSWER-d) An Aquitard. What is one of the primary objectives for the operation of a water distribution system? a) Maintain adequate pressure and reliably deliver adequate flow b) Maintain water quality c) Efficiently perform system operations d) All of the above - ANSWER-d) All of the above The primary origin of coliforms in water supplies is? a) Natural algae growth b) Fecal contamination by warm-blooded animals c) Natural Organic Matter d) Cross Connections - ANSWER-b) Fecal contamination by warm-blooded animals What is the recommended minimum water pressure in a distribution system at any time, including fire flow conditions? a) Greater than Zero b) 10 psi c) 20 psi d) 30 psi - ANSWER-c) 20 psi The definition of a public water system in the Safe Drinking Water Act is a system that supplies piped water from human consumption that has at least? a) 15 service connections or serves 25 or more persons for 60 or more days a year b) 25 service connections or serves 15 or more persons for 60 or more days a year c) 15 service connections or serves 60 or more persons for 25 or more days a year d) 60 service connections or serves 15 or more persons for 25 or more days a year - ANSWER-a) 15 service connections or serves 25 or more persons for 60 or more days a year

Pieces of metal that are designed to corrode instead of the facility they are designed to protect are called? a) Insulated Wire b) Sacrificial anodes c) Electrolysis Test Stations d) Metallic Syncs - ANSWER-b) Sacrificial anodes The federal Lead and Copper Rule requires that samples be collected? a) From the Raw Water Source b) From the Treatment Plant c) From the Distribution System d) From Residential Taps - ANSWER-d) From Residential Taps The term Corrective Maintenance is? a) Work performed in response to a failure b) Work performed at the direction of a supervisor c) Work performed to prevent failures d) Work performed as scheduled maintenance - ANSWER-a) Work performed in response to a failure Any of the bacteria within the coliform bacterial group can be considered as? a) An indicator of viral contamination b) A deadly organism c) An indicator of the potential presence of pathogenic fecal organisms d) A violation of secondary health standards - ANSWER-c) An indicator of the potential presence of pathogenic fecal organisms In order to preserve the ability to locate non-metallic pipes in the future new installations typically require the installation of? a) Survey monuments b) Location markers c) Radio tranmission chips d) Tracer wire - ANSWER-d) Tracer wire A primary consideration in determining the number and location of sampling points in a water distribution system are that they should be? a) Representative of each source and condition within the system b) Ease of collecting the sample c) Location of the water quality lab

d) The size of the water main - ANSWER-a) Representative of each source and condition within the system Cathodic protection means protection against? a) Contamination b) Corrosion c) Hardness d) Infiltration - ANSWER-b) Corrosion What is the term for water samples collected at an individual location at a specific time? a) Grab samples b) Composite samples c) Snapshot samples d) Proportional samples - ANSWER-a) Grab samples Disease causing organisms such as bacteria and viruses are known as? a) Coliforms b) Carinogens c) Protozoans d) Pathogens - ANSWER-d) Pathogens Which of the following devices are typically used to measure instantaneous distribution system pressure? a) Pressure Transducer b) Pressure Gauge c) Pressure Meter d) Pressure Recorder - ANSWER-b) Pressure Gauge What does the Total Coliform Rule require in response to a positive sample for Total Coliforms? a) Immediate Public Notification b) Issuance of Boil Water notices c) Repeat Sampling d) Distribution system flushing - ANSWER-c) Repeat Sampling The metal component that is protected from corrosion is called the? a) Cathode b) Anode c) Rectifier d) Electron - ANSWER-a) Cathode

The performance curve of a pump reflects? a) Pump capacity b) Pump efficiency c) Pump horsepower d) All of the above - ANSWER-d) All of the above As flow increases, friction losses in a water distribution pipeline? a) Decrease b) Remain the same c) Increase d) Can increase or decrease - ANSWER-c) Increase What is the difference between a primary standard and a secondary standard? a) Primary standards refer to substances that are carcinogenic; secondary standards do not. b) Primary standards refer to substances that are thought to pose a threat to human health; secondary standards refer to aesthetic water quality c) Primary standards refer to substances that, if not put in check, will eventually kill humans; secondary standards do not. d) Secondary qualities refer to contaminants that will only make some people sick, while primary standards refer to substances that will make everyone sick. - ANSWER-b) Primary standards refer to substances that are thought to pose a threat to human health; secondary standards refer to aesthetic water quality Which of the following devices can be used to measure distribution system pressure over a period of time? a) Pressure Recorder b) Pressure Gauge c) Pressure Transducer d) Pressure Meter - ANSWER-a) Pressure Recorder With ductile-iron pipe, the best joint to use when the installation is aboveground where rigidity is required, such as in water treatment plants and pumping stations, is a? a) Mechanical Joint b) Flanged joint c) Restrained Joint d) Grooved and shouldered Joint - ANSWER-b) Flanged joint A pump assembly where the impeller is mounted directly on the shaft of the motor driving the pump is referred to as?

a) Close coupled b) Frame Mounted c) Shaft Driven d) Mixed Axial - ANSWER-a) Close coupled The hydraulic grade at any point in a distribution system is made up of the following two components? a) Flow and Pressure b) Elevation and Volume c) Velocity and Flow Rate d) Elevation and pressure head - ANSWER-d) Elevation and pressure head A water company's average day demand is determined by dividing the? a) Water use per month by the number of days that month b) Total water use for a year by 365 days c) Water use per week by seven days d) Average day demand by the number of residents - ANSWER-b) Total water use for a year by 365 days The primary origin of coliforms in water supplies is? a) Natural algae growth b) Natural Organic Matter c) Fecal contamination by warm-blooded animals d) Cross Connections - ANSWER-c) Fecal contamination by warm-blooded animals Which of the following is not a reason for a water distribution system flushing program? a) Improve disinfection residual b) Remove Sediment c) Correct Total Coliform Positives d) Increase Water age - ANSWER-d) Increase Water age Which type of pipe most commonly requires a cathodic protection system? a) Steel pipe b) PVC Pipe c) Asbestos Cement Pipe d) Concrete Pipe - ANSWER-a) Steel pipe In a double suction centrifugal pump? a) The pump has a high suction pressure

b) Water enters both sides of the impeller c) The pump has two inlet pipes d) The pump has two impellers - ANSWER-b) Water enters both sides of the impeller What does not materially affect the head loss due to friction in a given length of pipe? a) Water hardness b) Number of fittings c) Roughness of the interior of the pipe d) Velocity of the flow - ANSWER-a) Water hardness Complaints of poor water quality will most likely occur in which type of water main layout? a) Arterial Loop b) Tree c) Grid d) Nebular - ANSWER-b) Tree Lead in drinking water is primarily the result of? a) Natually occuring mineral deposits b) Industrial pollution c) Lead paint d) Corrosion within the distribution system service lines and residential plumbling - ANSWER-d) Corrosion within the distribution system service lines and residential plumbling What is the recommended minimum water pressure in a water distribution system at any time, including fire flow conditions? a) Greater than Zero b) 10 psi c) 20 psi d) 30 psi - ANSWER-c) 20 psi Pipeline beam breaks are caused by? a) Earth Movement b) Water Hammer c) Corrosion d) Uneven support on the bottom of the pipe - ANSWER-d) Uneven support on the bottom of the pipe The maximum theoretical suction life of a centrifugal pump at sea level is approximately?

a) 15 feet b) 20 feet c) 34 feet d) 40 feet - ANSWER-c) 34 feet The direction of the slope of a hydraulic grade line during flow conditions? a) Is always downward b) Is Flat c) Is always upward d) Goes upward or downward as flows increase or decrease - ANSWER-a) Is always downward A POSITIVE bacteriological sample means? a)Absence of bacteriological contamination b) Presence of bacteriological contamination c) Presence of nitrates d) Positive chlorine residual - ANSWER-b) Presence of bacteriological contamination Water hammer is most likely caused by? a)Air in the water b) Closing a valve too fast c) Hardness of the water d) Peak hour flows - ANSWER-b) Closing a valve too fast Pressure in a pipeline may be affected by? a) Color and Turbidity b) Fiction and elevation c) Hardness and Temperature d) Turbidity and Temperature - ANSWER-b) Fiction and elevation What exterior forces should be considered when selecting distribution piping? a) Weight of Backfill b) Traffic Loads c) Seismic Vulnerability d) All of the above - ANSWER-d) All of the above If the discharge pressure of a centrifugal pump is increased and the pump speed remains the same the pump discharge flow output will? a) Decrease

b) Increase c) Remain the same d) Increase slightly, then decrease - ANSWER-a) Decrease Static head is the? a) Pressure due only to the depth or elevation of water b) Energy of motion of the water c) Pressure loss in the line due to friction d) The pressure during fire flow conditions - ANSWER-a) Pressure due only to the depth or elevation of water What is the minimum length of time water must remain motionless in service lines prior to first-draw residential lead sampling? a) 2 hours b) 4 hours c) 6 hours d) 8 hours - ANSWER-c) 6 hours In order to comply with Regional Water Quality Control Board requirements, prior to entering a storm drain or receiving water, water from fire hydrant or main line flushing operations must be? a) Disinfected b) Dechlorinated c) Filtered to remove Iron and Manganese d) Tested for bacteriological quality - ANSWER-b) Dechlorinated A bell and spigot connection is used in what type of pipe joint? a) Mechanical Joint b) Flanged Joint c) Victaulic Coupling d) Push on joint - ANSWER-d) Push on joint What is not a component of the total head required to be produced by a pump? a) Discharge Pressure b) Friction Losses c) Atmospheric Pressure d) Suction Pressure - ANSWER-c) Atmospheric Pressure Minor losses are a measurement of head loss in the system due to? a) Friction loss in pipe fittings

b) Low flows c) Measurement inaccuracies d) Friction losses in the pipeline - ANSWER-a) Friction loss in pipe fittings By regulation which type of water source of supply requires treatment by filtration prior to delivery to water consumers? a) Groundwater b) Surface Water c) Potable Water d) All of the Above - ANSWER-b) Surface water Peak flows in a water distribution system are driven by? a) Irrigation b) Morning Customer Demand c) Evening Customer Demand d) All of the Above - ANSWER-d) All of the above Ductile iron pipe is typically protected from corrosion by? a) Wrapping it in polyethylene plastic b) Connecting it to a sacrificial anode c) Using an impressed current cathodic protection system d) Mortar coating - ANSWER-a) Wrapping it in polyethylene plastic Pressure in a pump is created by? a) Forcing water through the volute with a reducing area b) Converting velocity head to pressure head as water flows around a volute with an enlarging area c) Increasing the temperature of the water d) Forcing a fixed volume from the inlet side to the discharge side of the pump - ANSWER-b) Converting velocity head to pressure head as water flows around a volute with an enlarging area When comparing friction loss in water pipes, a larger Hazen-Williams C-factor value indicates the pipe is? a) More durable b) Able to withstand a higher pressure c) Smoother inside d) Rougher inside - ANSWER-c) Smoother inside Which of the following well types is most protected from surface contamination?

a) Artesian Well b) Infiltration Gallery c) Shallow Well d) Spring Collector - ANSWER-a) Artesian Well Check valves are used to? a) Permit air to escape from the pipe b) Regulate Velocity c) Permit flow in only one direction d) Stop flow in both directions - ANSWER-c) Permit flow in only one direction Standard fire hydrants should not be installed on water mains smaller than? a) 4 b) 6 c) 8 d) 10 - ANSWER-b) 6 inches in diameter What is the term for a framework of wood or metal installed to prevent caving of trench walls? a) Trench Box b) Sloping c) Haunching d) Shoring - ANSWER-d) Shoring Which of the following best defines the term Drawdown? a) Water level in a well after a pump has operated over a period of time b) Change in water elevation from the static level to the pumping level c) Distance from a well that the cone of depression affects the normal water level d) Distance from the ground to the pumping level - ANSWER-b) Change in water elevation from the static level to the pumping level Diaphragm control valves are operated by? a) Adding or removing water from the cover above the diaphragm b) Turning the operating nut by a valve key or hand wheel c) Rotating diaphragm actuators d) Control valve operating panels - ANSWER-a) Adding or removing water from the cover above the diaphragm The underground pipe fitting connecting the inlet pipe to a fire hydrant is called the? a) Auxiliary Pipe

b) Bury c) Hydrant Riser d) Fire Line - ANSWER-b) Bury Operators must have unobstructed access to a ladder for escape from a trench within what distance? a) 15 feet b) 20 feet c) 25 feet d) 30 feet - ANSWER-c) 25 feet If there is sufficient pressure for water to flow from a well that taps an aquifer the well is called? a) A flowing artesian well b) An aquifer recharge well c) A pieziometric well d) A groundwater well - ANSWER-a) A flowing artesian well Why should isolation valves be installed at frequent intervals in distribution systems? a) To stop water from flowing backward through a pump that is not in operation b) To throttle flow and maintain a lower pressure in a lower distribution system zone c) So that air that accumulates at high points in pipes can be automatically vented d) So that small sections of water main may be shut off for maintenance - ANSWER-d) So that small sections of water main may be shut off for maintenance Which type of hydrant has no main valve but has a separate valve for each nozzle? a) Wet barrel b) Warm-climate c) Dry-barrel d) Breakaway - ANSWER-a) Wet barrel As a general rule, water pipes should be separated from sewer pipes by a horizontal distance of? a) 6 ft. b) 8 ft. c) 10 ft. d) 12 ft. - ANSWER-c) 10 feet The water table is defined as? a) Pumping level in a well

b) Upper surface of the groundwater c) Water level in a reservoir d) Water level obtained in a well after penetrating several aquifers - ANSWER-b) Upper surface of the groundwater What type of valve is used to vent air that has accumulated in a water pipeline? a) Air Relief Valve b) Air Compressor Valve c) Air Venting Valve d) Air Binding Valve - ANSWER-a) Air relief valve What type of fire hydrant is pictured below? a) Flushing b) Wet Barrel c) Flame Resistant d) Dry Barrel - ANSWER-d) Dry Barrel (Has top Cap) What is the purpose of thrust blocks and anchors in a water distribution system? a)Slow the water flow in a water main b) Secure heavy equipment at an excavation site c) Restrain pipe joints, elbows, tees, and crosses from coming apart as a result of the force created when water changes direction d) Adjust the angle of repose at which a trench wall should be excavated to prevent cave-ins - ANSWER-c) Restrain pipe joints, elbows, tees, and crosses from coming apart as a result of the force created when water changes direction The copper tubing connecting multiple chlorine cylinders to a manifold assembly is called the? a) Pigtail b) Service Connection c) Chlorine Conduit d) Chemical Tubing - ANSWER-a) Pigtail A cross-connection is defined as a connection between? a)A high pressure system and a low-pressure system b) Two different sized pipes c) A potable water system and a source of contamination d) Two intersecting pipes - ANSWER-c) A potable water system and a source of contamination The definition of a confined space includes the following component?

a) Limited or Restricted Means of Exit b) Large Enough for Employee to Enter c) Not Designed for Continuous Occupancy d) All of the above - ANSWER-d) All of the above The amount of chlorine added to water minus its chlorine residual equal? a) The combined chlorine residual b) The chlorine demand c) The free chlorine residual d) The total chlorine residual - ANSWER-b) The chlorine demand What does SCADA stand for? a) Statistical Calculations and Data Analysis b) Standard Computer and Data Accessory c) Sample Concentration and Data Analyzer d) Supervisory Control and Data Acquisition - ANSWER-d) Supervisory Control and Data Acquisition What is the minimum chlorine residual that must be maintained in a potable water distribution system? a) 0.2 mg/l b) 0.5 mg/l c) 1.0 mg/l d) 2.0 mg/l - ANSWER-a) 0.2 mg/L Oxygen deficient atmospheres have less than what concentration of oxygen? a) 15.5 % b) 19.5% c) 23.5% d) 26.5% - ANSWER-b) 19.5% Information displayed at secondary instruments is conveyed from the primary sensor by what type of electrical signal? a) 120 - 208 volts b) .748 - 1.5 kilowatts c) 4 - 20 miliamps d) None of the Above - ANSWER-c) 4-20 miliamps The fusible plugs on a chlorine container are designed to melt and release chlorine when the container reaches which temperature range?

a) 100 to 105 F b) 140 to150 F c) 158 to 165 F d) 212 to 220 F - ANSWER-c) 158F to 165F Which two conditions can cause water or liquids to backflow into a water system? a) Valvue maintenance and Pump Maintenance b) Service Leak and Water Hammer c) Backsiphonage and Cross-Connection d) Backsiphonage and Backpressure - ANSWER-d) Backsiphonage and backpressure What is the limitation of using Ultraviolet (UV) rays for disinfection water conveyed in distribution system? a) Lack of measureable chlorine residual b) Lack of reliable technology c) Long start-up time for equipment d) Microorganisms become immune to disinfectants - ANSWER-a) Lack of measureable chlorine residual Before doing any work on any piece of electrical equipment, the operator should perform the following procedure? a) Read the O&M manual b) Lock out and tag the equipment c)Notify a supervisor d) Contact the manufacturer - ANSWER-b) Lock out and tag the equipment The on-site computer that provides independent local control functions at remote distribution facilities is called the? a) Programmable Logic Controller b) Remote Transmitter Unit c) Telemetry System d) Central Computer Controller - ANSWER-a) Programmable Logic Controller What is an Invert in distribution? a) Top of the pipe b) Middle of the pipe c)The bottom of the pipe d) The side of the pipe - ANSWER-c) The bottom of the pipe The purpose of Trench Safety doesn't include which of the following?

a) Sloping b) Shoring c) Slipping d) Haunching - ANSWER-c) Slipping What term is used when a water utility divides its total operating expenses into the total revenue? a.) Debt ratio b.) Operating ratio c.) Credit ratio d.) Coverage ratio - ANSWER-b.) Operating ratio Under the requirements of the Safe Drinking Water Act, it is the duty of the water purveyor to deliver potable water of proper quality only as far as the: a.) Entry point of the distribution system b.) Customer's curb box and service connection c.) Consumer's tap inside the home d.) Furthest water main blow-off or sampling point - ANSWER-c.) Consumer's tap inside the home According to the USEPA drinking water regulations, the owner or operator of a public water system which fails to comply with applicable monitoring requirements must give public notice within: a.) 45 days of the violation by posting a notice at the town hall b.) 1 year of the violation by including a letter with the water bill c.) 3 months of the violation in a daily newspaper in the area served by the system d.) 1 week of the violation in a letter hand delivered to customers - ANSWER-c.) 3 months of the violation in a daily newspaper in the area served by the system A mixture of air and gas is considered hazardous when the mixture exceeds what percentage of the lower explosive limit (LEL)? a.) 0% b.) 3% c.) 7% d.) 10% - ANSWER-d.) 10% Which of the following duties should not be performed by a small system operator? a.) Disinfect water mains b.) Observe pump motors to detect unusual noises, vibrations, or excessive heat c.) Repair and overhaul chlorinators

d.) Wire pump, compressors and electrical components of the water system - ANSWER-d.) Wire pump, compressors and electrical components of the water system Which form of hypochlorite is the most dangerous to handle? a.) Sodium b.) Fluoride c.) Calcium d.) Chlorine - ANSWER-c.) Calcium What type of fire extinguisher should be used for fires with live electricity present? a.) Class A b.) Class B c.) Class C d.) Class D - ANSWER-c.) Class C To ensure that the water supplied by a public water system meets federal and state requirements, the water system operator must regularly collect samples and: a.) Test the water at the nearest water testing laboratory b.) Determine a sampling schedule based on the lab's recommendations c.) Send all analysis results to the State periodically d.) Count the number of active wells in the system - ANSWER-c.) Send all analysis results to the State periodically How many coliform samples are required per month for a water system serving a population between 25 and 100? a.) 1 b.) 2 c.) 3 d.) 4 - ANSWER-a.) 1 What test method best determines chemical feed/dosage rates? a.) Jar b.) Turbidity c.) Hammer d.) Hardness - ANSWER-a.) Jar After a new water mains is installed and pressure tested it should be: a.) Flushed with clean water for 24 hours and put into service b.) Filled with a solution of 25ppm to 50ppm free chlorine for at least 24 hours prior to flushing