Texas Class C Surface Water Practice Exam

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• What is considered the most significant water quality change in filter effluent?
• What is the primary use of chlorine in water treatment?
• Which method is typically used for testing residual chlorine levels in water?
• What term is commonly used to refer to disease-producing organisms?
• A pneumatic ejector is used primarily to lift water from low points. What device accomplishes this?
• What solution is used to detect chlorine leaks?
• What type of screening is generally recommended for vent openings to minimize risks?
• Which factors influence the loss-of-head through a sand filter bed?
• How many gallons are there in one cubic foot of water?
• What is a valve that connects a customer's service to the water main called?
• What is the volume of a 100 ft. diameter tank that is 12 ft. deep?
• Which chemical is commonly used to raise pH levels in water?
• What is the recommended capacity for ground storage according to the State Board of Insurance?
• Soda ash is primarily used in water treatment processes to achieve which of the following?
• If the pressure gauge at the bottom of a 200 ft. standpipe reads 68 psi, what is the static head in feet?
• Given a chlorine demand of 3 mg/L, what would be the residual chlorine if 20 lbs of chlorine gas is used to treat 400,000 gallons of water?
• Why is it essential to monitor dissolved oxygen levels in water?
• Which of the following is NOT a function of a foot valve?
• If sludge remains too long at the bottom of a sedimentation basin, what issue could arise?
• What is the primary purpose of fluoridation in municipal water supplies?
• What happens to chlorine leaks in metal containers over time?
• What is the pressure gauge reading at the base of a tank filled to a depth of 1 ft.?
• Which type of pipe is most likely to be damaged by corrosion?
• The Rules and Regulations for Public Water Systems require sedimentation basins to provide a minimum detention time of how many hours?
• What features should hand trucks have when loading or unloading 150 lb chlorine cylinders?
• What is the effective pH range suitable for iron and manganese removal?
• What happens to chlorine demand when organic material is left inside a replaced water main?
• A pH reading of 6.0 in raw water indicates that the sample is what?
• Filters used in a water treatment process primarily serve to reduce what?
• What factor is considered the most important in preventing accidents in waterworks operations?
• What is the approximate volume in gallons of 15,000 cubic feet of water?
• What does the volume of a water sample depend on?
• What is a common result of inadequate pH stabilization in water treatment?
• What is a potential disadvantage of operating gas chlorinators at excessive rates?
• What can happen if chlorine gas is released in damp surroundings?
• What information must be included on a warning tag attached to a locked-out switch?
• A flow of 1.55 ft³ per second is equivalent to how many gallons per minute (gpm)?
• An employee without a breathing apparatus is in a room where chlorine gas suddenly begins leaking. What should the employee do first?
• What is the chemical name for muriatic acid?
• According to regulations, the minimum pressure in all water distribution systems should not be less than?
• What can black stains on plumbing fixtures indicate?
• How can the occurrence of mud balls in filter beds be minimized?
• If the discharge pressure gauge on a pump reads 15 psi, this is equivalent to how many feet of head?
• The DPD test method for chlorine residual typically involves the use of what?
• Waterworks operator's holding grade C certificates are required to renew their certificates every three years and to:
• What is the main advantage of a venturimeter?
• What is the volume of a settling tank measuring 100 ft. long, 25 ft. wide, and 8 ft. deep?
• The Safe Water Drinking Act has set water quality standards for which of the following categories?
• What is the volume of a cylinder with a radius of 5 ft. and height of 8 ft.?
• Which agency defines public water systems in Texas?
• What is the purpose of testing alkalinity in water systems?
• Which treatment method is commonly used to remove tastes and odors caused by decaying vegetation?
• What is the result of increased hydrogen ion activity in water?
• What role does the concentration of dissolved gas play in filtration?
• How is the diameter of a standpipe typically related to its height?
• How many grams are in one kilogram?
• What is one substance that a sand filter will not effectively remove?
• In terms of water quality, what is a possible consequence of high levels of trihalomethanes in drinking water?
• What is required for a pump when the gland follower is pulled all the way down?
• If the flow is 35,000 gallons per day, what is that in million gallons per day (MGD)?
• If a fire hydrant requires a nozzle pressure of 100 psi, what head of water is needed to supply it?
• How many gallons per minute are equivalent to a flow of 1.0 MGD?
• A non-permit confined space by OSHA standards means a confined space that:
• Filter underdrains are important for which purpose in filtration systems?
• What are the three tests performed in the multiple-tube fermentation test?
• What is considered the most important factor affecting the useful life of piping?
• What is the chemical symbol for sodium?
• What does the term water stabilization specifically refer to?
• How much pressure in the mains will a 100,000-gallon reservoir develop compared to a 1-million gallon reservoir at the same elevation?
• What should vent openings on reservoirs and clearwells be?
• According to the average annual water budget for Texas, how does the majority of surface water leave the state?
• Pressure in water systems is commonly measured in which unit?
• Chloramines are formed by the addition of chlorine and which other chemical?
• What is the primary purpose of the Maximum Contaminant Level (MCL) in drinking water regulations?
• Which of the following conditions improves sedimentation efficiency?
• When securing a locked-out switch, who is authorized to remove the warning tag?
• What is the surface area of a clarifier with a diameter of 40 ft?
• If a piezometer is inserted into a pressurized pipe at 50 psi, to what height will the water rise in the tube?
• What condition will decrease the capacity of a centrifugal pump?
• What is the primary function of an altitude valve?
• Why are mechanical seals being increasingly installed in pumps?
• How should the packing around the shaft of a centrifugal pump be adjusted?
• In water treatment, what is the importance of screening vent openings?
• After installation or repair of a water line, what concentration of chlorine treatment is recommended?
• Which reagent is used to determine chlorine residual in water?
• What chemical compound is primarily used for softening water?
• How many feet of water will one pound of pressure raise water?
• In terms of safety, what is crucial to ensure when transporting chlorine cylinders?
• If a rotameter is calibrated to measure a certain gas, what must be done to use it for a different gas?
• What effect does carbon dioxide in water have on pH levels?
• When used in connection with the Safe Drinking Water Act, the term "MCL" means:
• Examples of non-community water systems include:
• Why is it essential to measure the pH in the water treatment process?
• Which of the following is considered a significant hazard in water treatment facilities?
• When using the combined available chlorine residual (CACR) method, how should the CACR be adjusted when water temperature decreases?
• What do organics in surface water combine with to form trihalomethanes?
• A significant increase in chlorine demand from 0.9 mg/L to 3.0 mg/L during well chlorination indicates what?
• A grab sample represents the quality of water when?
• What is the nature of ozone (O3) to humans?
• The pH scale runs from ___ to ___?
• What does free chlorine residual in water represent?
• In treating raw water, what process comes first before filtration?
• A disease that cannot be contracted by drinking contaminated water is:
• One of the purposes of water storage tanks is to:
• What purpose do polyphosphates serve in water treatment?
• When a single water sample is reported as safe, what does this imply?
• What does "gpm" stand for in water flow measurement?
• The TCEQ requires that results be recorded and submitted daily for surface water supplies for:
• The amount of dissolved oxygen in water is primarily dependent on what factor?
• How does the density of chlorine gas compare to that of air?
• What is the final step in the removal of suspended matter in water after coagulation and sedimentation?
• What process is utilized to remove suspended particles and clarify water in treatment plants?
• What is the relationship between water temperature and chlorine residuals when using the CACR method?
• How much leakage is acceptable from a packing gland?
• The performance of a pump is influenced when dealing with what component?
• A hypochlorinator is used to feed what into a water supply?
• A water treatment plant averages a flow of 261 gallons per minute. What is the daily flow in million gallons per day (MGD)?
• What hazardous property is associated with chlorine gas?
• Tracking and maintaining an operator's training records is ultimately the responsibility of the:
• What is the primary use of sodium hypochlorite in water treatment facilities?
• What is a major consequence of failing to properly monitor disinfectant levels in water treatment?
• If two pressure gauges at the foot of two storage tanks are at the same elevation and the water levels are the same, what will the gauge on tank X, holding 1,000,000 gallons, read compared to tank Y, holding 500,000 gallons?
• How much 65% calcium hypochlorite is required to disinfect a water storage tank with a dosage of 50 mg/L, with the tank being 36 feet in diameter and 20 feet high?
• What can result from gas chlorinators being operated at high rates?
• Which pH measurement indicates that water is basic?
• What component of a centrifugal pump is installed to hold the priming?
• What is a major cause of wear in pump and motor shaft couplings?
• What is the equivalent temperature of water in Fahrenheit if the temperature in Celsius is 10 degrees?
• Velocity of flow in water mains is typically expressed in what unit of measurement?
• The process of coagulation involves which of the following reactions?
• Which of the following statements is true regarding the sedimentation process?
• What is the typical volume of water that corresponds to one Million Gallons per Day (MGD)?
• Calcium hypochlorite is typically available in what form?
• What is the weight of one cubic foot of water?
• In the context of chlorine detection, what does the presence of white smoke signify?
• What is the general effect of corrosion in water treatment systems?
• If the chlorine residual is measured at 0.6 mg/L and 6.6 mg/L has been applied, what is the chlorine demand?
• When collecting a water distribution sample for bacteriological testing, how long should water be allowed to run before filling the sample bottle?
• Water that requires a large amount of soap to produce an acceptable lather is classified as what?
• What is the primary responsibility of a certified waterworks operator?
• What is the approximate weight, in pounds, of 50,000 gallons of water?
• What indicates a leak in a chlorine cylinder valve when ammonia vapor is present?
• In raw water reservoirs, what is the most common benefit of aeration?
• What term describes mud, silt, clay, and other suspended matter in water that cause it to appear murky?
• What type of pump may be damaged if started with the discharge valve closed?
• What is formed when a coagulant reacts with finely divided and suspended material in raw water?
• What tool is used to open and close chlorine valves?
• What is the chemical symbol for iron?
• What should a water system do to ensure safety after repairs or installations?
• What does alkalinity measure in water?
• Which of the following is a key characteristic of calcium hypochlorite?
• What is the main purpose of a rotameter?
• Sodium hypochlorite is primarily used for which purpose?
• Which organisms are commonly used as indicators of drinking water contamination?
• Which of the following is NOT a purpose of filter underdrains or bottoms?
• What is the effect of insufficient suction head on pump operation?
• According to the TCEQ, how many service connections must a public water system serve to be classified as such?
• What is the difference between the amount of chlorine added to water and the residual chlorine at the end of the contact time?
• What does the pH test of water indicate?
• What is a common effect of using incorrect chemical dosage in water treatment processes?
• Baffles in water treatment are used to prevent what issue in sedimentation basins?
• What is the maximum flow rate through a sand filter recommended to ensure effective filtration?
• What could an increase in chlorine demand indicate regarding water quality?
• What is the weight of water in terms of lbs per gallon?
• Coagulation is influenced by which of the following factors?
• In the context of confined spaces, what is a key determining factor for requiring a permit?
• In what type of environment is chlorine gas known to be corrosive?
• What is the minimum normal operating pressure stated for water distribution systems?
• What is considered the most effective method for cross connection control?
• When connecting a new chlorine cylinder, which item must be placed?
• Which type of meter has no moving parts?
• If the chlorinator setting is 35 lbs/day and the flow is 1.15 MGD, what is the chlorine dosage?
• The term floc refers to what in the context of water treatment?
• What is the required chlorine residual that distribution systems must maintain in the far reaches according to public water regulations?
• What is the primary function of a piezometer in a water system?
• The occurrence of which issue can be reduced by proper sedimentation in filter beds?
• What should a water quality operator do to maintain compliance with daily reporting requirements?
• Jar tests in water treatment are primarily used to determine what?
• A pH value of 7.0 is considered to be what?
• Before changing a gas chlorine cylinder in a room, the first step should be:
• How should valves be operated in high pressure lines?
• Why should prepared water sample bottles not be rinsed before collecting samples for bacteriological examination?
• Evaporation and transpiration represent which aspect of the water cycle in Texas?
• What is static head defined as?
• What does a high chlorine demand in a well typically suggest?
• What percentage of chlorine does calcium hypochlorite contain?
• What is the most significant source of surface water in Texas?