Water Distribution Manager (WDM) Greenbook 2 Practice Exam

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• Which component flow path is created by the pump casing for suction and discharge?
• What is the primary purpose of determining the operating point where the system head curve intersects the pump curve in a distribution system model?
• Double suction pumps use which type of impellers?
• Vertical turbine pumps are used for inline booster service.
• Overflow pipe should not be connected to which of the following?
• Overflow pipe should be brought down from the maximum tank level to a point within how many feet of the ground surface?
• Lantern rings do what to the packing?
• Prime centrifugal pump: if head exists on the suction side, the valve on the suction line should be
• A thermocouple measures which quantity?
• A bellows sensor is described as a device with a sensing element that expands and contracts with varying pressure. Which material is specified for this element?
• Connects the pump shaft to the motor shaft.
• What should a WDM know about lead service line replacement programs and how to communicate with customers?
• Centrifugal pump casings converts ___ to ___
• Which type of level sensor is considered the oldest?
• What actions should a water utility take when issuing a boil-water advisory to the public?
• What is the purpose of surge analysis and why are air chambers or surge tanks used?
• What is a thermistor?
• A bourbon tube is best described as which shape?
• How many packing rings are permitted?
• Wear rings in a pump are used to
• What is the role of asset management in Water Distribution Manager and how does it integrate with maintenance planning?
• Motors are designed for an external ambient heat of how many degrees?
• Which characteristic describes a wound-rotor induction motor compared to a squirrel cage motor?
• What types of materials and coatings are used in aging distribution mains and how do you manage lead-containing coatings?
• Packing is designed to
• Which practice supports compliance by maintaining detailed device test records for backflow prevention?
• To prevent excessive circulation of water between the impeller discharge and suction areas, which component creates a flow restriction?
• What is the primary purpose of backflow prevention device test reports?
• What are the two common types of rotary pumps?
• How do you implement an effective flushing program and what are its objectives?
• During priming, the water is typically drawn from which line to fill the casing and suction pipe?
• Which strategy best minimizes disinfection byproduct formation while maintaining disinfectant residuals during seasonal demand swings?
• Which of the following signals a disinfectant residual loss and what is a typical mitigation?
• The connection between the lower barrel and the upper barrel should be approximately how many inches above ground?
• What are the criteria guiding the selection between booster pump and a variable-flow pump (or VFD) for raising pressures in a distribution system?
• Why are pressure zones and PRVs important, and where are PRVs typically installed?
• What is breakpoint chlorination and when is it used in the distribution system?
• Double suction pumps use which type of impellers?
• Which term refers to a system where a central receiver requests data from instruments over a single channel?
• What is the purpose of a valve exercising program and how often should critical valves be exercised?
• Which centrifugal pump casing type is most common in water utilities?
• Which component remains stationary in a typical electric generator or motor?
• What triggers activation of an emergency response plan in a water utility?
• In a distribution system, how does the operating point influence energy consumption?
• What is a typical step in assessing cross-connection risk for customers with irrigation or booster systems?
• What is a key capability of correlation-based leak detection?
• What is the stator in an electric machine?
• In a synchronous motor, the rotor speed is
• How do pH and alkalinity influence lead and copper release from pipes, and what operational adjustments can mitigate risk?
• Lantern rings __ the packing.
• Double suction pumps can pump approximately how many gallons per minute?
• Axial flow design has no volute or diffuser vanes.
• In NRW metrics, what does real losses measure?
• Red hydrants correspond to which flow category?
• Mechanical seals are like __ but are used with 60psig or more.
• What is water hammer and how can it be mitigated in a distribution system?
• What is the recommended hydrant testing procedure?
• In a pressure management plan, what key components are typically implemented and monitored?
• Which device is commonly used to hold the packing in place and allow adjustment?
• What is mean residence time and how is it estimated in a distribution system?
• What is the impact of ammonia presence on chlorination strategy?
• What role does SCADA play in incident response during a contamination event?
• Packing rings ___ leakage.
• Double suction pump head maximum is up to how many feet?
• How can prudent pressure management reduce unaccounted-for water and service line leaks in a distribution system?
• Cathodic protection is an electrical system used to prevent corrosion of metals. Which option correctly reflects this concept?
• When the motor reaches full speed, the discharge valve should be
• Which term describes moving data through a single channel in only one direction?
• What component is used to supply water to an elevated tank?
• Which signal is the most commonly used standard for transmitting sensor information?
• Radial flow design is a _____ pump.
• Which energy sources can drive a vacuum pump or ejector used for priming?
• Which term describes the use of a single wire or channel to carry the information for several instruments?
• What are common non-revenue water (NRW) components and how can they be reduced?
• Which sensor uses a flexible copper element that expands and contracts with pressure changes?
• Fire demand can account for what percent of the storage system's total capacity?
• What is a core element of cross-connection risk management for irrigation or booster systems?
• Antifriction device used to support and guide pump and motor shafts.
• What is the significance of a continuity of operations plan for water utilities and what are its core elements?
• Which term describes sending multiple signals over a single channel by varying frequency?
• Which term describes monitoring several instruments over a single communications channel with a receiver that periodically asks each instrument to send current status?
• Which option best describes a typical maintenance activity for a PRV?
• Gate valves throttling practice states that they should not be used to throttle.
• What is cross-connection control and why is an ongoing program essential for water safety?
• Which maintenance practice is correctly matched to its valve type?
• Which term describes sharing a single channel among several instruments?
• Foot valve is usually provided when the __ is above water level.
• Which technique involves checking the value of each instrument sequentially?
• What are the two types of positive displacement pumps?
• If no head exists on the suction side and no foot valve is provided, priming is accomplished by a
• In EPANET modeling, what does a disinfectant residual represent?
• What are the main types of backflow prevention devices and when is testing and certification typically required?
• Which pump type delivers flow in distinct pulses or surges?
• Mesh for air vents on elevated tanks should be __ in.
• Which device starts a motor using less than line voltage to avoid overload?
• The surface for packing rings to bear against is called the
• What is the function of storage tanks in a distribution system, and which practice helps prevent stratification?
• Which current uses transformers?
• Rotary pumps act on which of the following valves?
• In the hydrant color/flow coding scheme, which option represents a hydrant with 1500 gpm?
• Which device serves the same function as packing?
• When the pump acts on both ends of the cylinder, the reciprocating pump is a
• In a prime centrifugal pump with no head on the suction side and a foot valve on the suction line, the casing and suction pipe must be filled with water from any source; usually the water is drawn from the
• Centrifugal pumps is a pump consisting of an impeller on a rotating shaft enclosed by a casing that has suction and discharge connections.
• What is the function of a foot valve in the suction line?
• Which component may be used to seal the space between the shaft and the case?
• Turbine pump is a centrifugal pump in which fixed guide vanes (diffusers) partially convert velocity energy to pressure head.
• Lubricate couplings every __ unless dry then no maintenance is required.
• How should you coordinate with public health authorities during a contamination event?
• What component connects the pump shaft to the motor shaft?
• In a feedback proportional control, what is the role of operator intervention?
• During a major main break, which sequence of actions best minimizes disruption and protects workers?
• Before shutting down the centrifugal pump, you should
• How do you determine the criticality ranking of assets for replacement planning under asset management?
• Which factor is least important when deciding to use a booster pump versus a variable-flow pump for pressure control?
• What lubricates the packing in a packing sealing system?
• What is the purpose of an emergency response plan in a water utility, and who should participate in its activation?
• Which device reduces friction while supporting and guiding pump and motor shafts?
• What is EPANET and what is it used for in distribution system analysis?
• Emergency power should operate how long per week?
• What factors contribute to a high criticality ranking for asset replacement planning?
• What is a reduced voltage controller?
• What percentage of pumps are powered by electric motors?
• What is the recommended hydrant testing procedure?
• Which term describes operator sends control signals back to the site of a transmitting sensor using a single transmission?
• What is SCADA and what capabilities does it provide to distribution system operations?
• Which motor has no slip?
• Which statement about Hazen-Williams C factor is true?
• What percentage of motor power is lost due to heat?
• A bourbon tube is best described as which shape?
• Which term describes sending and receiving data at the same time?
• Which statement best describes typical chlorine residual targets in a distribution system and how to manage residuals during high demand?
• Which hydrant color and flow combination indicates the highest capacity?
• Which mode allows data to be transmitted in only one direction on a channel?
• In a squirrel cage induction motor, the rotor is composed of which structure?
• Which sensor is defined as a spiral-wound tubular element that coils and uncoils with pressure changes?
• Single-phase motors are primarily used in which size category?
• What is the purpose of 'alternate facilities' in a continuity of operations plan for water utilities?
• How often are hydrants inspected?
• Where is the foot valve typically located in a priming setup?
• Where should pressure gauges be placed in a pumping system?
• What is the primary difference between reciprocating and rotary pumps?
• Centrifugal pumps will operate under what condition?
• What metrics are commonly used in water audits to track performance and progress toward reducing NRW?
• How do you perform leak detection using correlation and acoustic methods and what steps follow a confirmed leak?
• In the hydrant color/flow coding scheme, which option represents a hydrant with less than 500 gpm?
• Motors are designed for an external heat of how many degrees?
• Which of the following is at the top of the stuffing box?
• In a reciprocating pump, if the piston acts on the liquid in only one end of the cylinder, the pump is called a
• What approach mitigates disinfection byproduct formation while maintaining microbial safety?
• Which statement about priming a centrifugal pump when there is no head on suction side and no foot valve is provided is correct?
• What is a key reason to perform valve exercising regularly in a distribution system?
• Which statement correctly describes the indicators and corresponding mitigation for disinfectant residual loss in a distribution system?
• What is corrosion control in a distribution system and what common methods are used to reduce lead and copper leaching?
• Reciprocating pumps are used for which type of liquids?
• Slip in a pump is the percent of water taken into the suction and that is not discharged.
• Foot valve is placed at the bottom of which pipe of a pump?
• A propeller in a pump primarily moves ______.
• Which component connects the pump shaft to the motor shaft?
• Why is it important to calibrate a hydraulic model to reflect real system conditions after changes?
• Which statement correctly describes a thermocouple?
• After priming, the centrifugal pump should be started with the discharge valve
• How would you respond to a sudden drop in system pressure that affects multiple zones and appears not to be caused by a pump outage?
• Which of the following impeller types is used in single suction pumps?
• A centrifugal jet pump combination is used for which application?
• Which sensor uses a spiral-wound tubular element that coils and uncoils with pressure changes?
• Which statement pairs a pump type to its typical usage correctly?
• In the hydrant color/flow coding scheme, which option represents a hydrant with 1000-1499 gpm?
• Which description best defines a motor starter?
• Which description matches feed-forward proportional control?
• Which motor is the most common in three-phase motors with rotor bars parallel to the shaft?
• Vertical turbine pumps are used for inline booster service.
• How is a hydraulic distribution model typically calibrated to reflect observed field data?
• To balance disinfectant residuals with minimizing disinfection byproducts during seasonal demand swings, which approach is recommended?
• How do you plan a proactive maintenance program to reduce main breaks and service interruptions?
• Cathodic protection is which of the following?
• What flow range corresponds to green hydrants?
• Double suction pumps are capable of pumping approximately how much flow and head?
• Single suction pumps use which types of impellers?
• What are the key elements of an effective water quality sampling plan for a distribution system?
• What is the significance of corrosion control when dealing with lead-containing materials in a distribution system?
• In leak detection and NRW management, how can meter accuracy influence apparent losses?
• Which statement best describes throttling with a gate valve?
• Which factors influence the required fire flow for a new development?
• What is the function of the centrifugal pump casing?
• Motors larger than fractional horsepower use what to start and stop?
• Which type of valve is used to isolate the pump on the suction side?
• Which assembly holds the lantern ring and packing?
• Which term describes sending several signals simultaneously over a single channel using tone-frequency methods?
• Peak hourly demand is what percent of the average?
• In a turbine pump, the diffusers are responsible for which of the following?
• Mixed flow design is for water that contains solids.
• Which statement best defines feed-forward proportional control?
• Isolating the pump on the suction side is accomplished with which valve type?
• Foot valve is a type of which valve?
• Plug, ball, self actuating or altitude valves are generally capable of throttling.
• What is the role of flow meter calibration and accuracy in daily operations?
• Which pump is best suited for moving large amounts of water at low head?
• An impeller in a pump primarily functions to ______.
• Which practice supports effective corrosion control in systems with lead service lines?
• Exposed risers in freezing temperatures should have a diameter of how many feet?
• How do you compute a district metered area (DMA) and why is it used for water audit?
• Which factors influence selecting chlorine versus chloramine as a disinfectant in a distribution system?
• Mechanical seals are like packing rings but used at higher pressure. Which component is similar to packing rings?
• What is the maximum PSI for single-suction pumps?
• What approach helps minimize stratification in storage tanks?
• Which pump type is not a positive displacement pump?
• Which sequence correctly describes how a motor starter begins motor operation?
• Which practice improves the accuracy of water metering and reduces apparent losses?
• In the hydrant color/flow coding scheme, which option represents a hydrant with 500-999 gpm?
• In the color-coded hydrant system, which color is used for the highest flow category (1500 gpm)?
• Hydrants are inspected yearly in which season?
• Which of the following is used to stop air leakage into the casing around a pump shaft?
• Which term describes sending or receiving data but not at the same time?
• What is the meaning of 'water age' in a distribution system and why is it important?
• Which component provides the bearing surface for packing rings?
• Which technique checks the value of each of several instruments one after another?
• Why are QA/QC procedures and chain-of-custody important in a sampling plan?
• The heart of the pump is called the
• In the Hazen-Williams equation, what does a higher C factor imply?
• To prevent leakage at the point where the shaft protrudes through the case, which components may be used to seal the space between the shaft and the case?
• Medium size motors should not be cycled more frequently than every __ minutes.
• What is the role of pump curves in calibrating a hydraulic distribution model?
• Axial flow design is a _____ pump.