WQA Certified Service Technician (CST) Training Practice Test

These questions are part of the practice quiz. Start practicing

• What is a likely outcome if a user misunderstands the operational instructions of a water system?
• What determines the Total Dynamic Head (TDH) in pump systems?
• What type of filtration method uses the principle of adhesion to purify water?
• What does the letter 'K', 'L', or 'M' indicate in piping?
• What is the purpose of installing a bypass for each piece of equipment in a system?
• What does the term 'solution types' refer to in water systems?
• What is the purpose of chemical injection systems in water treatment?
• What device is recommended to manage high water pressure when installing a water system?
• What type of tubing is suggested for refrigerator feeds to ensure optimal performance?
• What material grants flexibility and durability to PEX piping?
• What term describes the aggregation of coagulated particles into larger flocs?
• Which process can significantly increase the efficiency of filtration by allowing smaller particles to be removed?
• What is confirmed by ensuring the drain accepts backwash flow?
• What is the relationship between filter area and filtration capacity?
• What position must the system be in to indicate readiness for operation?
• At what intervals should copper tubing support be spaced for sizes of 1.25 inches or less?
• What happens to a tank when it becomes waterlogged?
• What is the main benefit of using pre-filtration in the water treatment process?
• What action is necessary during the initial startup of a reverse osmosis system?
• What is the purpose of using an air gap with a sink or floor drain in plumbing systems?
• What is a primary feature of countertop Reverse Osmosis (RO) systems?
• What is the primary function of lead-free solder?
• What best describes a grounded power supply in water treatment?
• What is crucial to perform after setting up a water treatment system?
• What factor can directly affect the pressure requirements in a reverse osmosis system?
• What is the supply line for unheated water in plumbing?
• What is a critical step that must not be overlooked before operating the system?
• What type of pump is used to increase pressure after atmospheric storage?
• Which step ensures that the installation procedure has eliminated air pockets in the system?
• What factor is critical for effective contact time in treatment systems?
• What factor is influenced by construction when it comes to filtration efficiency and maintenance?
• What is the primary role of plumbing codes?
• What does sagging of pipes typically lead to?
• What action should be taken to prevent potential freeze-ups in ice makers?
• What is the primary purpose of opening faucets during installation?
• What must be adequate for the safe operation of a filter?
• What can cause issues like noise, stagnant water, and leaks in plumbing systems?
• What is the key consideration for the placement of the storage tank in a reverse osmosis system?
• Which tool is used to heat pipes for soldering without an open flame?
• Where should the RO faucet be installed during the setup of a reverse osmosis system?
• Which system component is crucial for managing water pressure fluctuations?
• What is the primary goal of chlorination in water treatment?
• What is a primary consideration for a storage tank in an RO system?
• Which of the following is NOT true about positive displacement pumps?
• Why is it crucial to add chemicals to water instead of the other way around?
• What is "static pressure" in water systems?
• What is the main purpose of a booster pump in a water system?
• The process of educating the owner post-installation primarily aims at what?
• Which safety precautions should be taken when handling chemicals?
• What specific PSI increase is required for every 100 PPM TDS in water?
• What does 'Startup Procedures' entail in water treatment systems?
• Which term refers to the initial steps required to guarantee proper operation of a water system?
• What is the recommended connection method for refrigerators using ice makers?
• What is the purpose of a booster pump in a water treatment system?
• What type of valve would be most suitable for throttling flow?
• What injection method uses water flow to create suction?
• How long does backwashing typically last for effectiveness?
• Which tool is recommended for measuring reject flow during the system operation?
• What function does venting serve in plumbing systems?
• When mixing chemicals, which is the correct procedure?
• What information should be provided to the owner after system installation?
• What type of fitting is commonly used to join two pipes of the same material?
• What type of valve is characterized by a spherical disc for frequent operation?
• What is required to ensure low feed water pressure is adequately managed?
• What can lead to issues within water filtration systems?
• What is the purpose of installation documentation in water treatment systems?
• What does GFCI stand for in electrical safety?
• What is the primary function of an injection pump in water treatment?
• What is the primary purpose of a filter system state before water supply is activated?
• What is the recommended best practice for ice makers in terms of water taste?
• What is an important function of pipe supports?
• Which type of pipe would be joined using a coupling?
• What is the first step in preparing water for disinfection?
• What is crucial to remember before pressure testing joints?
• What impact does higher pressure have on faucet flow rate?
• What is the purpose of a contact tank in a water treatment system?
• What is the main consequence of neglecting regular maintenance in water purification systems?
• What is the minimum feed pressure required for proper installation in a water system?
• For which purpose might pressurized tanks be used in water treatment?
• Which device is used to allow normal operation of a system even when it is offline?
• What type of fittings control the direction of water flow?
• What establishes regulations for safe and sanitary plumbing installations?
• What size tubing is preferable for water dispenser connections leading 50 feet away?
• What regulatory framework governs waste discharge codes?
• What is the higher cost regenerant that is 2-5 times more expensive than NaCl?
• What process is used to eliminate harmful contaminants from the water system?
• During what phase of the installation should the connections be verified for security?
• What is the purpose of allowing the system to reach full pressure for 5 minutes?
• What is often included in the troubleshooting process for water purification systems?
• Which is a critical factor for the operation of water treatment systems?
• What do oxidizing filters use to treat water?
• What action should be taken regarding site preparation before installation?
• Which component is designed to enhance the recovery efficiency of a water system?
• What is commonly associated with the process of recrystallization in a brine tank?
• What is the main purpose of a Safety Data Sheet (SDS)?
• Which is a critical part of evaluating a water system's efficiency?
• What can inconsistency in faucet flow rate indicate about a water system?
• What device is specifically designed to detect leaks within the system?
• What component should be installed along with the control valve to ensure safety?
• What characterizes positive displacement pumps?
• What type of pipe fitting helps to reduce the risk of joint breaks?
• What process involves reversing flow to clean the filter media?
• What component stores salt for the regeneration solution in softeners?
• What should be assessed before performing maintenance on a water system?
• Which task is part of the system validation process?
• What factor directly influences how quickly water flows through a filtration system?
• What method is used to eliminate microorganisms from water?
• What should be confirmed regarding water before installation?
• Which installation practice is essential for maintaining pipe integrity over time?
• What is a common characteristic of centrifugal pumps?
• Which process requires grounding for operational safety and effectiveness?
• What is the purpose of ProPress fittings?
• What role does a flow sensor play in a chemical feed system?
• Which system alternates between units to ensure a supply of softened water?
• What tool is best used for cutting soft pipe effectively?
• Which valve provides precise control of water flow?
• What is a common mistake made during the installation of systems with multiple appliances?
• What is the purpose of pressurized tanks in water treatment?
• To ensure efficient water flow in a basement installation, how should the tank be positioned?
• Which injection method relies solely on pressure difference?
• Which system uses UV light to eliminate pathogens in water?
• Which type of system is used for automatic regeneration in water softening?
• What is the preferred mounting orientation for UV disinfection systems?
• In a co-current flow system, in which direction do the feed water and brine flow?
• Which system ensures a continuous supply of softened water?
• Which of the following practices ensures effective water treatment system setup?
• How should the location of Point of Use (POU) systems be chosen?
• What is required for ozonation processes?
• In terms of safety when handling chemicals, what is an important practice?
• What does the order of operations refer to in the context of installing POU systems?
• Why is it important to know the location of the main water shut off?
• What is "dynamic pressure" in a water system context?
• What does the term "pressure" refer to in the context of water systems?
• Which chemical is commonly known as bleach and used for disinfection?
• What is a primary reason for performing coagulation in water treatment?
• What is the significance of maintaining a minimum air gap in plumbing systems?
• What type of valves pose a low pressure and contamination risk?
• What is essential to prevent leaks when joining pipes?
• What critical function does the brine tank serve in a water softening system?
• What should be done to ensure clear and effective system operation?
• What describes the process where undesirable materials stick to a filtration medium's surface?
• What is a Pneumatic Storage Tank designed to do?
• What issue arises from improper spacing of pipe supports?
• What are POE systems used for in water treatment?
• What is the purpose of connecting the filter assembly in a reverse osmosis system?
• What device is responsible for shutting off water in the absence of overflow?
• What is the significance of understanding "pressure drop" in water systems?
• Which aspect does public health protection ensure in plumbing?
• What is involved in the assembly of a water softening unit?
• What should be analyzed to assess the effect of the water treatment system?
• What equipment is typically used to prevent leaks in a water supply system?
• What does insufficient storage in a small diameter drain lead to?
• What diameter tubing is recommended for connections extending 25 feet to a water dispenser?
• Which action is performed to verify testing procedures in a water treatment system?
• What process involves removing sharp edges from the ends of pipes?
• What is the main function of mechanical filtration in water treatment?
• Which term describes the pipeline that carries unheated water?
• What type of electric outlet should the unit be connected to during installation?
• What solution is required to maintain a constant temperature in the brine tank?
• What is a licensing requirement for water well pump installers?
• What is the main advantage of having a properly functioning leak control valve?
• What should be taken into account for the safe installation of water systems?
• How is filter pore size significant in water filtration systems?
• What is an important step in preparing an installation area?
• Which is the primary function of a swing check valve?
• What should be avoided due to its harmful effects on PEX?
• What is the primary purpose of an air gap in plumbing systems?
• Why is it important to leave slack in the tubing during installation?
• What is the significance of installing a bypass for treatment equipment?
• What does back pressure in a pneumatic system refer to?
• Which factor contributes to the efficiency of dissolved solids rejection?
• Which of the following describes the steps to link a water softener?
• Which component directs water flow through the softener cycles?
• What process involves adjusting the chemical state of waterborne contaminants?
• Which type of power supply is required for certain water systems?
• What critical step in the setup helps ensure the system's operational integrity?
• For optimal performance, what should be monitored regularly in a reverse osmosis system?
• What should be verified regarding tools and equipment before beginning an installation?
• What should the installer verify after completing the physical setup of the system?
• When defining "pressure," what is considered?
• According to plumbing standards, what is the rule regarding pipe size reduction?
• What is the function of carbon filters in water purification?
• Which valve allows for straight flow with minimal restriction?
• What is the process called that involves the clumping of fine colloidal particles in water?
• What components are included in thermal protection for a water system?
• What does filter area refer to in water treatment systems?
• Which type of valve is typically used when frequent operations are required?
• What type of systems require specialized sensing and shut-off procedures?
• What connection is established to allow efficient drainage in a reverse osmosis system?
• Which substances are characterized as oxidizable and may include Fe2+, H2S, or Mn2+?
• What is the primary function of depth filters in water treatment?
• Which is primarily verified during leak checks in a reverse osmosis system?
• What is a fundamental advantage of using adapters in plumbing?
• What ensures safe waste removal in plumbing?
• What happens to the pressure in a hydropneumatic system during peak usage?
• What is the term for the direct method of injecting chemicals into water?
• What is the benefit of knowing about ambient water temperature before installation?
• What measure indicates how much water a filter can process?
• What is the primary function of a hydropneumatic storage system in pumping?
• Which pump is utilized to increase pressure before equipment operation?
• Which system is controlled based on a preset time interval for regeneration?
• What is a major consequence of bladder failure in a storage tank?
• How should the drain line be connected to ensure compliance with health standards?
• What should be considered when selecting a location for the drip tray?
• What is the next step after confirming the water connection in reverse osmosis system installation?
• What substances are used to promote coagulation in water treatment?
• What measurement does the term "head" refer to when discussing water systems?
• What type of valve prevents backflow, allowing flow in one direction?
• Why is it important to photograph the installation process?
• What is the final step in assembling a water treatment system according to the standard procedure?
• What does PSI stand for in water pressure measurement?
• Which procedure is involved in drain testing?
• What device routes water around the softener in bypass mode?
• What type of joint is characterized by melting the materials together?
• In what application would you most likely find point of entry (POE) systems?
• Which plumbing component conveys wastewater away from fixtures?
• What is the recommended support spacing for plastic pipes of 1.25 inches or less?
• During system installation, why is documentation critical?
• Which piece of equipment injects treatment chemicals into a water system?
• Which is an essential step before confirming system readiness?
• What component assists in the operation of a reverse osmosis system by connecting the filters?
• What is the minimum flow rate for checking the RO faucet, as per the standards?
• What is preferred over brass for LLDPE tubing applications?
• What is defined as the removal of electrons from substances?
• What is the purpose of turning off a system in relation to fixture protection?
• What does the term 'Bypass Installation' refer to in a water supply system?
• During testing, what should be monitored when opening the faucet?
• What is the term for checking site conditions before installation begins?
• In which area is using a diverter valve most notable?
• What role does regular maintenance play in water systems?
• True or False: All PEX fittings conform to True Copper Tube Size (CTS) standards.
• What device is used to create turbulence to speed up chemical reactions?
• Which process is used for the disinfection of water using chlorine?
• What method uses screens to filter water at the point of use?
• Which of the following is essential for maintaining the effectiveness of a water treatment system?
• What role does oxidation play in water treatment processes?
• What is the direction of flow in a counter-current flow system?
• What is the intended result of installing a post filter in front of an ice maker?
• What is the primary benefit of ensuring filter longevity in a water system?
• What is the primary purpose of flocculents in water treatment?
• What issue can Potassium Chloride (KCl) encounter in a brine tank?
• What is coagulation/flocculation primarily used for?
• Which procedure is essential for ensuring no air is trapped in the plumbing system after installation?
• Which of the following processes does not involve filtration?
• Which fittings are used to change pipe direction by 90 or 45 degrees?
• What does POE stand for in the context of water systems?
• What is the purpose of running the system with an open faucet during installation?
• What type of pumps does the impeller-driven category encompass?
• What refers to the plumbing systems within a residence, including various pipes?
• Which fittings are used to join pipes made from different materials?
• Which of the following is NOT a function of a static mixer?
• What term describes the speed at which water passes through a filter?
• Which device emits pulses for variable flow rate chemical injection?
• Which tubing size is appropriate for ice maker connections that are 50 feet long?
• What is the purpose of using a thermal expansion tank or PRV?
• What does oxidation accomplish in water treatment?
• What is the minimum feed water pressure recommended for treating water with 350 TDS?
• What type of check valve uses a spring to control flow direction?
• What is the principal function of ion exchange systems in water softening?
• How should the installation of water systems be approached to ensure minimal wastewater production?
• What feature is essential for monitoring the operation of a water system for safety?
• What type of filter specifically changes the valence state of oxidizable molecules?
• Which process involves particles adhering to a surface during filtration?
• Brine tank float controls are primarily used to manage what aspect of a water treatment system?
• What is necessary for adequate drainage during the regeneration cycle?
• To what does the term 'customer error' typically refer in water systems?
• What is the primary purpose of public health protection in plumbing systems?
• What does "pressure loss" refer to in plumbing?
• What factor should be met according to the manufacturer's specifications during installation?
• What is the recommended location for installing the regenerant tank?
• What type of regeneration system is based on the amount of softened water used?
• What typically requires additional storage capacity in a reverse osmosis system?
• What is the key requirement concerning indirect discharges?
• What is the purpose of pretreatment in water treatment processes?
• What is the appropriate outside diameter of tubing for ice maker connections up to 15 feet?
• How must the chemical enter the water flow for effective chemical injection?
• Where should the influent be connected in a water treatment system?
• How long should a customer be instructed to drain the tank after initial filling?
• What can cause water pressure to increase overnight in a water system?
• What common practice is recommended for drainage in water systems to prevent contamination?
• What is the primary purpose of disinfecting before system installation?
• What is the purpose of a disinfection process in water treatment?
• What method is typically employed for measuring salinity in water treatment?
• What process is involved in preparing the water filtration system for initial use?
• Which valve is a common type with the least flow resistance?
• What does "head" refer to in water systems?
• What should be done after the startup of a reverse osmosis system to ensure there are no issues?
• Which term best describes the process of ensuring the cleanliness of the system prior to usage?
• How is an air gap defined in terms of measurement?
• What is a key consideration when choosing a location for the treatment system?
• What type of pump is used to recover energy from the reject flow for improved efficiency?
• What device measures flow rate to activate the chemical feed pump?
• What is a critical requirement during the regeneration cycle?
• Which aspect should be closely monitored when using any plumbing fittings or methods?
• What is the purpose of insulating the brine tank above the brine level?
• What is the effect of higher pressure on dissolved solids rejection in water systems?
• What is the first step in the installation process for a reverse osmosis system?
• What is an essential step in the troubleshooting methodology for water systems?
• What is essential to do in the installation area before beginning installation?
• In pump installation, which factor must be considered to avoid overheating?
• What process do deionizers use to purify water?
• What does premise plumbing consist of?
• What action should be taken after setting the bypass valve to the service position?
• Which process helps ensure the quality of the water produced by the treatment system?
• What must match the feed pump during the chlorination process?
• Which of the following contributes most to the longevity of an installed system?
• What is the role of a diverter valve in an RO system?
• What is emphasized about pipe spacing for smaller diameter piping?
• What is the initial filtration process intended to do before water treatment?
• Which brands are associated with PEX piping?
• Which line provides heated water from the heater?
• In plumbing applications, which fitting is typically employed for reducing pipe size?
• How should performance be evaluated in a water purification system?
• What safety measure does a Ground Fault Circuit Interrupter provide?
• What is the primary purpose of owner orientation in water treatment systems?
• What is meant by "pressure drop" in a water system?
• Which of the following describes the chemical feed pump's function?
• What is the site for ion exchange in a softener system?
• Which term describes excess chlorides found in effluents that are not sodium?
• What operation is often included in the routine for water treatment system maintenance?
• What is the primary purpose of a backflow preventer?
• What benefit is gained by using a permeate pump in a water treatment system?
• What determines the frequency of backwashing in a filtration system?