Water Treatment Grade 4 Practice Exam

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• What process is known as the buildup of corrosion products that reduces pipeline capacity?
• In the multi-tube fermentation method, what type of culture media is used in the confirmed test?
• Which disinfectant would work best against Cryptosporidium?
• What is the minimum population requirement for a water system to be classified as a public water system?
• Which type of pipe joint allows flexible alignment, is inexpensive to manufacture, and easy to assemble?
• What is typically the percentage of solid material in alum sludge?
• What happens if the bed in a GAC filter is not adequately cleaned?
• During which process should powdered activated carbon be added for optimal results?
• What is a major benefit of using chloramines for disinfection?
• Which treatment method is primarily used to reduce turbidity in water?
• At what time of day are water use rates generally highest in a community?
• What type of valve is typically used with a bypass?
• If the activation process of silica is not carefully controlled, what could be the consequence?
• In water treatment, what type of colonies are typically being monitored?
• Which of the following best describes the nature of bacteria found in water treatment systems?
• What health issue may arise from long-term consumption of water with high fluoride levels?
• Which three types of alkalinity are commonly identified in water treatment?
• What benefit have systems with plate or tube settlers reported?
• Which type of pipe is permeated by fuel oil?
• What type of pump is a peristaltic pump classified as?
• What could be a consequence of failing to clean a GAC filter adequately?
• What is the main purpose of sedimentation in water treatment?
• Which factor is crucial for the effectiveness of a watershed management plan in reducing nitrate levels?
• What is the method of resin renewal called?
• When air is used as the feed gas for an ozone generator, what is required?
• Granulated media filters can effectively remove iron and manganese precipitates without sedimentation if solids are below what concentration?
• What is the first step in calculating the percent by weight of an element in a compound?
• What are three undesirable effects of implementing a water concentration program?
• When water recirculates within the pump impeller and casing, this is referred to as what?
• What chemical is used to regenerate exhausted natural zeolite for softening?
• Which metal is more noble and less likely to corrode than zinc?
• For which type of water are diatomaceous earth filters specifically used?
• What would likely be the most effective solution to control algae in source water that is clogging filters at a water treatment plant?
• Which chemical acts as a bacterial nutrient for stabilizing potable water?
• What frequency is recommended for evaluating the bed surface in water treatment filters?
• What is the acceptable percentage of total coliform samples for a water system that collects at least 40 samples per month to remain in compliance?
• How can reverse osmosis reject water be disposed of?
• What type of fluoride chemical should be used in down flow saturation?
• Which regulation requires surface water systems to maintain specified C x T values?
• What issue can arise because PAC is a fine powder?
• What type of meter is best to use for a fire main installation in a hotel?
• What is the MCL for chloramines (Cl2) in drinking water?
• How does the presence of nitrates in water primarily affect infants?
• Why is a rapid sand filter backwashed at a lower rate at the beginning?
• What must all positive samples in the presence-absence test be confirmed using?
• Electrodialysis is primarily used for what process?
• Which national law regulates underground disposal of wastes in deep wells?
• During backwash, what bed expansion percentage must be achieved for filters using granular activated carbon?
• Which of the following characteristics of raw water must be considered when selecting a treatment chemical?
• An example of a source of direct current is?
• How far should riser pipes in a meter pit be placed from any wall to prevent freezing?
• Which of the following is not a type of equipment used in mechanical dewatering?
• What is required for the regeneration of virgin greensand?
• What is one of the main functions of a water quality monitoring program?
• What should the concentration of solids be in the lower level of sludge in a softening facility solid contact basin?
• What is a common disadvantage of using UV light for water treatment?
• What does softening resin exchange for calcium and magnesium in water?
• What is a key characteristic of mechanical seals in water treatment systems?
• What is a key factor that filtration by granular media depends on?
• Which of the following is NOT a component of a typical rectangular sedimentation basin?
• What is one key characteristic of effective coagulants?
• What gas is released as bubbles in a sedimentation basin?
• Which of the following is a common issue when feeding fluoride to water supplies?
• What is a common issue with manganese greensand filters that can be remedied?
• What is the maximum contamination level (MCL) for turbidity in water treatment?
• What is the maximum percentage of backwash water that should be used for dual media filters?
• What must operators balance when addressing chlorinated organic compounds?
• Why is chlorine typically applied as a gas in water treatment?
• What is the minimum angle at which self-cleaning tube settlers must be placed?
• What is needed at the bottom of a pipe when the pump is above water?
• How often should the distance between the top of the carbon and the wash water troughs be measured to determine carbon loss?
• What is the principal source of excessive lead and copper in a customer's water?
• For a gasoline fire, which type of extinguisher should be used?
• In the past, where were treatment residuals typically discharged?
• According to the SWTR, disinfection residual samples must be collected at the same location as which type of samples?
• Where is scale most likely to form in a hypochlorinator?
• What is the primary purpose of coagulation in water treatment?
• Water that is to be analyzed for inorganic metals should be codified with which substance?
• In which climate are water meter pits usually found?
• What is a disadvantage of using static mixers?
• Which of the following is a type of positive displacement pump used to feed liquid chemicals?
• What air component does wet activated carbon remove?
• Why is it necessary to allow the water to run for a few minutes before taking a coliform sample?
• How can a bad leak on a chlorinator best be detected?
• What role do coagulants play in water treatment processes?
• If a single chlorine cylinder is delivering 48 pounds per day and forming frost, what is the best solution?
• What is the typical dosage level of permanganate sufficient to control most oxidizable taste and odor causing materials in raw water?
• Which of the following is a temporary solution to provide safe drinking water after contamination?
• If an operator knows the exchange capacity of the resin bed, what else can they predict?
• In what form is chlorine dioxide often generated to ensure the lowest chlorine levels?
• Which of the following is an acceptable MCL for nitrite?
• What is the main objective of a customer complaint response system in water treatment?
• What substance is used to regenerate exhausted natural zeolites in water softening?
• Where should turbidity sampling points be located in a community water system?
• What type of pipe joint is available in both bolted and boltless designs?
• What are the primary reasons for change in the performance of all membranes over time?
• What is the maximum weir loading for light alim floc in solids contact basins?
• Which process is essential for treating water high in organic contaminants?
• Alkalinity in the "T" form means the pH will be reduced to what level?
• In water treatment, what does the term 'disinfection' refer to?
• Why is liquid alum commonly used in surface water treatment plants?
• Which method includes Presumed, Confirmed, and Completed tests?
• When should core samples be collected from filters using granular activated carbon?
• Which authority sets the limits for the amount of ozone allowed in treatment plants?
• Which method for chlorine dioxide generation is most likely to have substantial amounts of chlorine in solution?
• Where can Cryptosporidium cysts typically be found?
• What does conductivity measure in an aqueous solution?
• What downside exists when using a glassy phosphate for corrosion control?
• What are the three reasons lime is the most commonly used chemical for pH and alkalinity adjustment?
• In dissolved air flotation units, mechanical rubber scrapers push the float over a ramp called?
• In the lime-soda ash softening process, the soda ash dosage is based on what?
• What method is often considered for optimizing the performance of a manganese greensand filter?
• Why do solids-contact basins have much shorter detention times than conventional treatment basins?
• How can manganese greensand filter performance be improved?
• What makes Cryptosporidium a challenge to eliminate from water supplies?
• What is the relationship between pH and alkalinity in water treatment?
• What is the maximum contaminant level goal (MCLG) for substances that are expected carcinogens?
• Raw water can usually be softened with lime alone when it contains what?
• What is the Maximum Contaminant Level Goal (MCLG) for fluoride?
• In a water treatment facility, what is the primary factor affecting flocculation efficiency?
• Conventional sedimentation has a _________ removal of cryptosporidium oocysts.
• Which chemical is used to stabilize water after it has been lime softened?
• What effect does raw water temperature approaching the freezing point have on coagulation and flocculation processes?
• For which parameter is continuous monitoring required to meet EPA regulations?
• What is a confined aquifer?
• What is the Maximum Contaminant Level (MCL) for lead?
• How long should water stand undisturbed before collecting a lead and copper sample?
• What is the MCL established for total THMs (TTHM) under Stage 1 DBPR?
• What action should be taken if a customer reports a bad chlorine odor?
• Which type of water quality parameter indicates the presence of organic matter?
• In contamination levels, what does "mg/L" stand for?
• What is the definition of power in the context of water systems?
• What effect does higher pressure have on reverse osmosis membranes?
• What type of sample should always be collected to determine the presence of coliform bacteria?
• What is the role of a wear ring in a centrifugal pump?
• What does a higher pH value indicate about water according to the Langlier index?
• When using a ton cylinder, how should it be positioned to handle leaks?
• What issue does the presence of dust from PAC pose for water treatment systems?
• What is the primary test used to indicate poor sedimentation performance?
• What needs to be done to ensure proper operation of GAC filters?
• To prevent scale buildup, magnesium hardness should be reduced to what level through excess-lime treatment?
• What is the MCL for chlorine in drinking water?
• What is a potential consequence of accidentally over feeding fluoride?
• What can slow surface runoff do to aquifers?
• What does 'static water level' in a well refer to?
• What are the two components of a solution?
• What is the recommended course of action immediately after exposure to chemical irritants?
• What is the MCL for copper in drinking water?
• What type of curve shows the relationship between power and capacity in pump operation?
• What is the process of regenerating ion exchange media in the sodium cycle called?
• What is generally low in rainwater that contributes to its softness?
• What is the primary goal of water treatment processes?
• Which of the following is NOT a method of introducing ozone into water?
• What are two general categories of catastrophes that can disrupt the operation of a water source?
• What is the primary purpose of NSF/ANSI Standard 61?
• Why must ozone be generated on site?
• What develops as solids settle to the bottom of a sedimentation basin?
• Total dissolved minerals in rainwater are typically:
• What is the primary indicator of fecal contamination in drinking water?
• Which safety equipment should be worn when handling fluoride chemicals?
• What is the optimal pH range for removing particulate matter using alum as a coagulant?
• What term refers to the process of removing water from thin sludge while allowing the solid material to remain?
• Which of the following is an example of the multi-barrier approach to water treatment?
• Which element is most commonly adjusted in water treatment to control the saturation of calcium carbonate?
• How many service connections define a public water system under the Safe Drinking Water Act?
• What unit is commonly used to measure flow rate in water systems?
• What is a common consequence of high turbidity levels in water treatment processes?
• Of the metals tin, zinc, and aluminum, which is most likely to corrode?
• What characteristic defines a coliform bacteria colony on agar plates?
• What is the minimum disinfection residual level that must be maintained in water served to a population over 3300 for up to 4 hours?
• What should you do if soda ash dust or lime slurry gets into your eyes?
• What limitation does blue baby syndrome impose on unborn children?
• What does the jar test primarily evaluate?
• What material are reverse osmosis membrane cleaning solution feed systems typically made of?
• At what temperature and pressure is glassware sterilized through autoclaving?
• Which type of valve is particularly useful for throttling the flow of corrosive liquids?
• What issue could arise from using Hexametaphosphate for corrosion control?
• What is considered the least important issue when selecting a water treatment process?
• What is the chemical formula for calcium carbonate?
• What testing method is most commonly used to assess coagulant effectiveness?
• Magnetic ion exchange resin has been developed to remove what substance?
• If a metal structure has a very low D.C. current going to the ground, what does it indicate?
• Which level of turbidity is considered acceptable in public drinking water?
• To effectively regenerate greensand, what is the duration for soaking in potassium permanganate?
• What substance is effectively removed by dissolved air flotation?
• Which emergency kit is designated for chlorine take care?
• What is the MCL for haloacetic acids (HAA5) in drinking water?
• What does the MCL represent in water treatment?
• Which treatment technique is most effective in preventing lead contamination?
• What do water supply regulations require most treatment plants to record?
• How does a bubbler tube measure pressure in a water treatment system?
• What standard covers materials that come into contact with drinking water?
• What is the purpose of recarbonation after lime-soda ash softening?
• Where are the sampling points for required sampling of natural radionuclides in a community water system located?
• In water treatment, what is the main focus of the regulations regarding chlorinated organic compounds?
• What is the MCL for total trihalomethanes (TTHM or THM) in drinking water?
• What typically accounts for the greatest amount of water usage in residential settings?
• What system applies when water rights are based on the concept of priority, determined by usage duration?
• What type of control system is best when both flow rate and chlorine demand vary?
• What by-products are generated when chlorine dioxide is produced on-site?
• What are screens located on an intake structure designed to remove?
• What condition indicates that a breaker is locked out?
• Which property of carbon dioxide in water can affect corrosiveness?
• Flocculation requires what type of mixing?
• What sizes of systems does the filter backwash recycle rule apply to?
• What does a Tier 2 violation require from operators?
• When conducting lead and copper sampling, when does the customer usually take the sample?
• How do ozone generators create ozone?
• What could be a long-term effect of water with a pH lower than 6?
• What repair kit is needed for a chlorine leak on a 150-pound cylinder?
• What is a key characteristic of Cryptosporidium that complicates water treatment?
• What is the exchange capacity of natural zeolites?
• In what position is a greensand filter typically placed?
• What is the Maximum Contaminant Level (MCL) for nitrate?
• What is the first step to take when a leak is found on a 150-pound cylinder?
• Which of the following factors is crucial for effective coagulation?
• What is the major cause of short circuiting in a sedimentation basin?
• How many oxygen atoms are present in calcium bicarbonate, Ca(HCO3)2?
• Where should ladders be located when shoring is installed?
• What is UV disinfection's sensitivity to pH and temperature?
• Which parameter is critical for assessing the quality of drinking water?
• What happens if the flocculation time is too long?
• Why is soda ash added to water in the lime softening process?
• What is the best approach for feeding powdered activated carbon (PAC)?
• Potassium permanganate should be fed as what?
• What is the approximate demand in ppm of chlorine when 6.1 ppm is applied and 0.6 is measured?
• What is a significant limitation of vertical turbine pumps?
• What is the main reason chlorine dioxide is used for pre-chlorination?
• Where is surface water typically stored for later use?
• If GAC loss exceeds what measurement, backwashing procedures should be evaluated?
• At what angle should the parallel incline plates be installed when using the shallow depth sedimentation method?
• What type of ozone generators is best for on-site ozone production?
• In what type of water are red staining problems from iron likely to occur?
• What is the correct method for moving a ton cylinder?
• Which chlorine compound produces the least detectable taste and odor?
• How does chlorine affect hydrogen sulfide (H2S) in water treatment?
• What type of water treatment process uses PAC?
• What is the common name for unslaked lime?
• What should you do if a pump loses its prime due to an air pocket in the suction line?
• Does filtration remove all impurities from water?
• What is the most probable cause of tastes and odors persisting or worsening when using PAC?
• What is called the raw water that has undergone pretreatment before entering the membrane arrays?
• Which factor is essential for determining the effectiveness of water treatment chemicals?
• In the jar test, what does slow mixing simulate?
• Why is quicklime widely used in water treatment processes?
• Typically, the time between backwashing of trident contact adsorption clarifiers averages?
• If an ion exchange softener treats a flow rate of 125 gpm, how many hours does it operate if it treats 297,000 gallons before regeneration?
• What does 'flux decline' refer to in membrane performance?
• A mixed media sand filter typically contains which materials?
• Is chlorine harmful to fish?
• How are zebra mussels often controlled at water treatment facilities?
• What is a characteristic of granulated media filters when used for contaminants?
• Which of the following best describes carbon dioxide?
• What is the purpose of sedimentation in water treatment?
• The thicker the sludge:
• Which method is commonly used for drilling water supply wells?
• What is a typical consequence of a high population density on water treatment facilities?
• What is the MCL for fluoride in drinking water?
• When a utility plans to feed chloramine for disinfection, what should they be aware of?
• In water treatment, what does the acronym MCL stand for?
• In water treatment, what does a higher pH typically indicate?
• Which force pulls particles together once they have been destabilized in the coagulation-flocculation process?
• Which component is essential for conducting water quality tests?
• What primarily affects the saturation point of calcium carbonate?
• What is reverse osmosis?
• What characteristic do colloidal particles have when discussing turbidity?
• In what type of habitats are Anabaena bacteria more commonly found?
• What condition can result from screen equipment being constantly wetted and dried?
• What type of pressure is provided by an SCBA during repairs on a chlorine gas leak?
• What is the minimum hardness that can be produced using the lime soda ash process?
• What is the rule that allows landowners to capture all the water under their land called?
• Which of the following is a disadvantage of using chlorination?
• Where are the sampling points located for required samplings of organics (except THMs) in a community water system?
• Which substance is known to increase pH, hardness, and alkalinity?
• What advantage do pulsating clarifiers provide in water treatment?
• Which rule most directly guards against the presence of Escherichia coli in the water supply?
• What is the primary goal of water treatment in relation to public health?
• What is the first level of dissolved solids that is considered unfit for human consumption?
• What is one of the main benefits of using peristaltic pumps in water treatment?
• If a water sample tests positive for E. Coli, what is the immediate action a utility should take?
• When water high in calcium bicarbonate is softened by ion exchange, what remains in the product water?
• Which oxidant has the potential to produce chlorate (CLO3) by-products?
• What is the c-value of new polyvinyl chloride pipe?
• In a conventional water treatment plant dealing with high nitrate concentrations, what is the best long-term solution?
• Standard plate count analyses should be performed how often on the filtered water and the water after final chlorination?
• An example of benchmarking in water quality monitoring is?
• Which of the following is not a water supply intake structure used in lakes and reservoirs?
• Which of the following is a requirement for compliance regarding the removal of TOCs?
• What is a common drawback of using ozone in water treatment?
• What is a Tier 2 violation regarding organic contaminant concentration?
• What is the function of a greensand filter in water treatment?
• Which contaminants are commonly found in groundwater that can affect potability?
• What type of floc particles often causes severe carryover of sludge solids?
• What other factor, along with TOC, must treatment plants consider under enhanced coagulation requirements?
• What method is used to introduce ozone into water?
• Jar tests are expressed in what measurement unit?
• When should backwashing rate procedures be reassessed?
• Which devices are available to introduce ozone into the water?
• What percentage of a sodium hypochlorite solution is typically lost at room temperature over a month?
• How often should operators record bed expansion measurements and conditions?
• How often does AWWA verify that its standards are being met by water systems in the US?
• What should the hardness level of water be when leaving the ion exchange vessel?
• If enteric disease-causing protozoans have been found in the effluent of a water plant, what is the most probable solution?
• What advantage does ferric sulfate have over alum as a coagulant?
• What type of sludge is the most common residual produced in water plant sedimentation basins?
• Which type of sludge cannot be discharged to a sanitary sewer system because it might block sewers?
• What should be the first action taken if a water plant operator notices a dramatic spike in turbidity and a reddish color in the water?
• What is the required continuous chlorine residual monitoring population threshold under the SWTR?
• What effect does colder temperature have on the settling rate of particles in water?
• Which piece of lab glassware is most accurate for measuring 100 mL of water?
• What does the term 'crossflow' refer to in reverse osmosis?
• What does a high level of turbidity typically indicate in water quality?
• What is a major characteristic of the Actiflo process?
• Which type of special photometer is used to analyze for heavy metals in water?
• For a safe drinking water supply, what is the typical acceptable level of chlorine?
• The lower the _____, the more difficult it is to form proper floc.
• What is the primary benefit of maintaining a neutral pH in water treatment?
• How is a hardness of 100 mg/L expressed as CaCO3 in grains per gallon?
• How much filter clogging material can microstrainers remove from sand filter operation?
• What is the action level for copper in drinking water?
• Volumetric feeders are typically?
• Which system is utilized to confidently confirm the presence of coliform bacteria in water?
• What is the simplest form of automation in water treatment?
• During sedimentation, what is the primary role of the gas bubbles?
• What is an advantage of a variable declining rate filtration system?
• What is the maximum turbidity level that direct filtration can effectively treat?
• Which high-rate process uses microsand?
• Which of the following conditions is most likely to create excessive lead in water?
• How is magnesium hardness typically treated to prevent scale problems in water sources?
• What is the maximum contaminant level (MCL) for haloacetic acids (HAA5)?
• Which is a recommended practice for managing scales in hypochlorinators?
• What is the greatest operating challenge associated with PAC?
• Which factor is important in evaluating water quality when measuring dissolved solids?
• Which treatment technology is not specified by the Surface Water Treatment Rule?
• What is the MCL for nitrite?
• Which method is commonly used to remove high levels of fluoride from water?
• What term describes the number of equivalent weights of solute per liter of solution?
• What is the term for source water treatment that utilizes ozone?
• Why is stabilization essential for softened water?
• Which operation problem is considered the most troublesome for sedimentation basins?
• Why is maintaining the correct pH during coagulation important?
• Which type of treatment process involves rapid chemical reaction due to recycled materials?
• What are the typical conditions for groundwater treatment using exchange processes?
• The amount of reject water produced by a reverse osmosis unit is dependent on which factors?
• Which of the following is a characteristic of tuberculation?
• What is head loss in a water system?
• Sludge produced by water drawn from sources with relatively low turbidity tends to be:
• Which type of hardness usually requires a two-stage softening process?
• What characteristic of ozone contributes to its necessity for on-site generation?
• Why is shaft alignment important in centrifugal pumps?
• What does static suction lift refer to?
• How much removal and/or inactivation of viruses is required in a water system from the raw water source to the first customer?
• Which of the following is a common sign of a water quality issue?
• What is the rule of reasonable sharing of water commonly called?
• In the event of total contamination of a water source, what is a recommended short-term strategy?
• What is an important consideration when determining flocculation time?
• What is another benefit of using potassium permanganate for oxidizing iron and manganese?
• What is the main purpose of a surge tank in water treatment?
• What problem is most likely caused by water with a pH of 8.9 in a distribution system?
• In comparison to chloramines, what is a primary advantage of using chlorine?
• Which authority recommends that turbidity performance and particle count be recorded in sedimentation basins?
• What is the maximum TOC level a public water system can have to avoid treatment requirements?
• What chemical element is commonly used to remove chlorine from water?
• What main advantage does UV light have over chlorination?
• What chemical is always present in the sample bottle for the coliform test?
• What must a community water system with over 100,000 people do regarding the consumer confidence report?
• Which detail is not recorded for each filter run?
• What is a common mistake that operators make regarding flocculation units?
• A typical coliform colony in the membrane filter method shows which characteristics?
• What is one of the key goals of the Surface Water Treatment Rule (SWTR)?
• What is the MCL for chlorine dioxide (ClO2) in drinking water?
• What is the purpose of coagulation in water treatment?
• In converting hardness, how much does 1 grain/gal equal in mg/L?
• Which factor indicates the performance of a water pump?
• What system is based on the principle that landowners have rights to all resources beneath their land?
• What does pH measure in water?
• What is the chemical formula for chlorine?
• What is the optimal pH range for coagulation with aluminum sulfate?
• Which of the following is not classified as a poly electrolyte used as a polymer coagulation aid?
• What could be a reason for the bearings on a pump to be very hot?
• The rule that a landowner can use groundwater as long as it does not harm a neighbor is known as?
• If a plant produces 100,000 gallons of 2% sludge and then thickens it to 30%, what is the volume of the 30% sludge?
• Under what condition does a water system using conventional filtration not need to use enhanced coagulation?
• Why is lime commonly used for corrosion control in water treatment?
• What does molarity measure in a solution?
• What is the primary purpose of a water treatment system?
• What is it called when a warm layer of water overlies a cold layer in lakes and reservoirs?
• Is it true that PAC will not remove fluoride ions?
• What is the duration of the general test period to confirm design capacity for a public water supply well with an unconfirmed aquifer?
• What is a clear well in the context of water treatment?
• What creates the flow restriction necessary for centrifugal pumps?
• Pulsating clarifiers are used to treat water that is?
• What is the primary function of the filtration process in water treatment?
• What does disinfection refer to in water treatment?
• Water used to dilute sodium fluoride solutions should be softened if the hardness exceeds what level?
• What is the purpose of using concentrated nitric acid in water analysis?