Certified Water Technologist (CWT) Practice Exam

These questions are part of the practice quiz. Start practicing

• What is the purpose of a water quality index?
• What should be the focus of continuing education for water treatment professionals?
• In a typical RO application, which membrane type is most commonly encountered?
• What does "channeling" result from?
• When using salt for regeneration of ion exchange resin, what is the typical dosage range?
• Which of the following is a typical effect of chlorine exposure?
• What does biomonitoring assess in aquatic ecosystems?
• Why is the process of softener regeneration important in water treatment?
• A cooling water system contains 12,000 gallons of water. How much biocide is needed for a dosage of 25 ppm?
• If a chemical pump is feeding 30 ml/min and operates 5 minutes out of every hour, how long will a 30-gallon drum last?
• What is the function of alum in water treatment?
• Which two processes are commonly used in water treatment?
• What can be a consequence of low oxygen solubility in water?
• In what type of water are biological contaminants most commonly found?
• What are the primary steps in softener regeneration?
• What is typically the optimal range for pH in cooling water systems?
• What is an aquifer?
• What process is used to monitor the quality of water in relation to aquatic life?
• What does turbidity indicate in water treatment?
• What is essential for maintaining the balance of nutrients in a water supply?
• Chloramines are primarily used for what purpose in water systems?
• Which parameter is measured by turbidity meters?
• Which amine is most prone to causing steam line deposits in systems with high CO2 levels?
• Why is monitoring water quality important?
• What is the primary purpose of a water quality monitoring program?
• What is the significance of monitoring pH levels in water treatment?
• How can total dissolved solids (TDS) in water supply be accurately measured?
• A positive value of the Langelier saturation index indicates what about the water?
• The most common treatment to protect copper and copper alloys in a cooling system is?
• Given a water with a pH of 8.3 and a Langelier pH of saturation of 6.5, what is the Ryznar Index?
• What is a critical consideration when selecting a corrosion inhibitor for a cooling system?
• What characterizes "hard water"?
• Which type of cooling system typically benefits from regular water treatment programs?
• Which federal agency is tasked with enforcing MSDS regulations?
• What does "contaminated runoff" signify?
• What is a common method for disinfecting drinking water?
• What could a high Ryznar Index indicate about water?
• What is a key function of the Environmental Protection Agency (EPA)?
• Cooling tower evaporation is approximately what percentage of the circulation rate for every 10 F temperature difference across the tower?
• What is the maximum permissible level of morpholine in steam that may contact food products?
• What kind of systems use a chemical feed pump?
• What is reverse osmosis?
• How is dental fluorosis caused?
• What is the maximum ABMA TDS limit for low pressure boilers (less than 300 psi)?
• Which method is used to assess water quality as indicated by a water quality index?
• How does temperature affect the solubility of oxygen in water?
• What is the primary function of a chlorinator in a water treatment facility?
• In water treatment, what does the process of backwashing do?
• What is a potential risk of inadequate water treatment?
• Given a bottle weighs 0.45 lb empty, 0.84 lb when filled with water, and 0.77 lb with a new product, what is the specific gravity of the new product?
• What is the desired salt concentration in a cation exchange softener regenerant?
• What is the primary purpose of training employees on the plant labeling system?
• What is the function of sodium nitrate in a standard "recipe" for steam generator boilout compound?
• Which of the following is a consequence of high levels of bacterial regrowth in stored water?
• What is an essential factor in the labeling of chemical containers in the workplace?
• The standard reaction between sodium sulfite and oxygen shows that each part of oxygen requires "about" how many parts of sodium sulfite?
• Name a potential indicator of waterborne diseases.
• What is the role of a flow meter in a water treatment plant?
• What is the role of a backflow preventer in water systems?
• What is the role of coagulants in water treatment?
• What is the proper location for the continuous boiler blowdown takeoff?
• What factors are crucial for achieving a microbiological "kill" in a cooling water system?
• What is the "normal" bed depth in a cation ion exchange softener?
• What does chlorine residual refer to in water treatment?
• How is "permeability" defined in relation to water treatment?
• What is the typical pH range for drinking water?
• What must a written Hazard Communication Program include to be complete?
• Which water treatment method utilizes ozone for disinfection?
• Which factor is essential in determining the flow rate of water in a cooling tower?
• Which organization is responsible for regulating water quality standards?
• Why is it important to manage water resources effectively?
• What is a common consequence of operating cooling systems without proper corrosion inhibitors?
• What is the most economical method for removing dissolved gases from boiler feedwater?
• What can gel type cation exchange resin be regenerated with?
• What is the total system volume in gallons for a cooling tower basin that is 15' wide, 12' long, with a water depth of 16 inches and 160 linear feet of 8 inch diameter piping?
• What is the main objective of wastewater treatment?
• What is a common consequence of elevated levels of fluoride in drinking water?
• What is the exchange rate of typical sodium ion exchange resin regenerated with 10 lbs of salt per cubic foot?
• A coordinated phosphate-pH treatment is typically utilized in which type of systems?
• What is the function of phosphate in water treatment systems?
• What is one effect of high turbidity levels in water?
• Which process helps to remove larger particles from water before filtration?
• Which factor is NOT considered in the design of a pot feeder for a chilled water system?
• Total hardness of water is primarily a combination of which elements?
• For efficient operation, what temperature should the storage section of a steam deaerator be maintained at?
• What symptom indicates a severe reaction to chlorine gas?
• In water treatment, what is the purpose of the backwash process?
• Using a 5 gallon pail, if it took 4 seconds to fill, what is the backwash rate?
• What does the term "cross-connection" refer to in water systems?
• What information does a water quality report typically provide?
• What chemical is frequently used to prevent scale formation in water systems?
• What is the primary role of a Certified Water Technologist (CWT)?
• Which of the following is a common method for removing contaminants from water?
• If a pump operates only 50% of the time, what should be the delivery in ml/min for a desired chemical feed rate of 15 gallons per day?
• If a cooling tower is circulating 2000 gpm with a ΔT of 8 degrees F, what is the best estimate for the evaporation rate (E) using the provided formula?
• What is one key advantage of membrane filtration?
• A water quality index primarily helps stakeholders understand what aspect of water?
• Which element is commonly recognized as an indicator of heavy metal contamination in water?
• What method is most commonly used to protect cooling systems from corrosion of copper alloys?
• What is the approximate level of dissolved oxygen a properly operating steam deaerator can achieve at a minimum?
• What does "bacterial regrowth" indicate about treated water?
• What does MSDS stand for and what information does it provide?
• What might be a sign of water contamination from heavy metals?
• Which forms of alkalinity typically exist in 150 psi boiler blowdown water?
• What is "chloramines"?
• What is the common effect of scaling in a cooling tower system?
• In the NFPA "diamond" label, what does the white square represent?
• What type of scale is primarily associated with water hardness?
• What is a key goal of disinfection processes in water treatment?
• What is the acceptable range for metal corrosion inhibition in a cooling water treatment program?
• Where is sodium nitrite predominantly used as a corrosion inhibitor?
• What is the desired salt concentration in the brine tank?
• When installing a pot feeder in a closed chilled water system in a tall building, what should be the minimum static pressure rating?
• What is the minimum feedwater sulfite level required when using an economizer?
• The acronym "HEPA" refers to what?
• What is a primary health concern about nitrates in drinking water?
• If a cooling tower evaporates 65 gallons per minute and cycles the makeup water 3.5 times, how much blowdown is required daily?
• What is a "ton" of refrigeration defined as?
• What measurement is used to express the rate of metal corrosion in cooling water treatment?
• What factor can significantly reduce the efficiency of a cooling tower?
• How can water quality be ensured in municipal water systems?
• How can biological contamination in water be controlled?
• Who issued the plan for managing pathogenic biological agents in U.S. Healthcare facilities?
• What might be a consequence of using water with high turbidity levels?
• How do primary, secondary, and tertiary water treatments differ?
• What is the primary method employed in biological filtration?
• What does the acronym "EPA" represent?
• What is the primary mechanism by which a cooling tower operates?
• Which chemical is commonly used to eliminate iron from water?
• What health risk is associated with lead in drinking water?
• Which factor is most important in determining the dosage of water treatment chemicals?
• What role does activated carbon play in water treatment?
• Which of the following is a common biocide used in cooling water treatment?
• How does biological filtration benefit water treatment processes?
• What is a potential source of lead contamination in water?
• Chlorine, bromine, and ozone are classified as which of the following?
• If a cooling water system blows down 15,000 gallons per day and the product contains 14% sodium molybdate, what is your daily feed rate in pounds for 5 ppm of Mo?
• What does the term 'sessile' refer to in the context of micro-organisms?
• Carbon dioxide in steam condensate primarily comes from the breakdown of which substance?
• Micro-organisms that cling to pipe surfaces are referred to as?
• What reaction leads to the formation of chloramines?
• What is the optimal range of cycles for cooling tower water to minimize blowdown?
• What does "absolute" pressure in lbs/in2 refer to?
• In a cooling tower, what is the typical evaporation factor related to temperature change?
• How can you convert temperature from Celsius to Fahrenheit?
• What is the function of a chemical oxygen scavenger in water treatment?
• In cooling tower systems, what is the primary means of heat removal?
• How is total dissolved solids (TDS) defined?
• What principle underlies carbon adsorption in water treatment?
• Which of these is a negative effect of chloramines in water systems?
• Why are hardness levels in water important?
• What is the per cent blowdown if there are 10 ppm of chloride in the feedwater and 200 ppm in the boiler blowdown water?
• How many gallons of water are softened per regeneration when 10 pounds of salt per cubic foot is used?
• Which component is typically removed through reverse osmosis?
• Which of the following is a key component of Employee Chemical Safety training?
• What are the primary contaminants found in groundwater?
• What is the ideal pH range for neutralizing amines to minimize corrosion in steam condensate?
• What type of chemical reaction is necessary for chlorination to effectively disinfect water?
• What is the main function of potassium permanganate in water treatment?
• If boiler feedwater calcium increases from 1 ppm to 3 ppm, how much additional phosphate treatment will be needed to maintain residual at 30 ppm with 8 cycles?
• What is the best choice for the chemical oxygen scavenger addition point?
• How much resin will a customer need to replace in a monoplex softener with an inside diameter of 30 inches and a bed depth of 40 inches?
• If feedwater hardness increases from 1 ppm to 3 ppm with a chelant treatment, how much increase in chelant treatment will occur after 8 cycles?
• What is the primary use of a borescope in water technology?
• What is a typical symptom of chlorine gas exposure?
• What is the purpose of using biocides in a cooling water system?
• What does CAS stand for in the context of chemical identification?
• What effect does high water hardness have on household appliances?
• What concentration range of salt is generally recommended for regenerating a cation exchange softener?
• What is the purpose of a settling basin?
• What is the purpose of disinfection in water treatment?
• What chemical is often used to control corrosion in boiler systems?
• What is the best method of disposing of spilled hazardous material?
• What is the purpose of a blowdown in a cooling tower system?
• What is typically the effect of biological contaminants in water sources?
• Which test is commonly used to assess water hardness?
• Ter-polymers used in cooling water treatment are generally not compatible with which type of biocide?
• Which process can result in the purification of drinking water?
• What does the term "influent" refer to in the context of water treatment?
• What is the effect of high levels of organic material in cooling tower water?
• What is the purpose of a water treatment plant's sedimentation process?
• Below what feedwater temperature should you switch from ordinary sulfite to catalyzed sulfite?
• What is the primary advantage of using UV radiation for water disinfection?
• In cooling systems, what does the term 'sensible heat' refer to?
• What is the primary function of a water softener?
• What is the importance of chlorine residual in treated water?
• Which factor greatly influences the effectiveness of cooling tower water treatment?
• What is the total hardness level of city water being processed in the duplex softener?
• Why is regular maintenance crucial for water treatment equipment?