Class C Water Operator License Water Exam Correct 100%

Calcium Hypochlorite - Answer A common chemical used in the disenfection of a small water supply is- A Cross Connection - Answer A physical connection between a potable water supply and a house well would be- Demand - Answer The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria is called? Greenish Yellow color Heavier than air Pungent, Penetrating odor Corrosive - Answer All of the following are Physical characteristics of Chlorine gas- Solution feed pump - Answer Which of the following would be considered a part of a hypo-chlorinator system? Flow measuring device - Answer According to state requirements, all public water supply wells should be provided with a raised concrete sealing block, screened vents and- The difference in static and pumping levels - Answer The drawdown of a water well is determined by- If it is more acidic or base - Answer The pH of water indicates- 0-14 - Answer The pH of water is expressed by a scale of numbers ranging from- 7.0 - Answer Water that is considered neutral is expressed on the pH scale at- Use of an approved, sterile container - Answer Which of the following is a required step in collecting a routine distribution sample for bacteriological testing? Turbidity - Answer Sand filtration will remove which of the following from surface water? Taste and Odor control - Answer Activated Carbon is used in a Surface Water Plant primarily for? Alum and Ferric Chloride - Answer Which of the following chemical(s) are commonly used as coagulants in surface water treatment? Screened Vents An approved locking roof hatch An overflow pipe with hinged flap device Annual inspection and maintenance as needed - Answer Ground storage tanks are required to be provided with which of the following? Painting Cathodic protection Water stabilization - Answer An elevated storage tank should be protected against corrosion by- 35 psi - Answer A public water supply system should maintain residual pressure of 20 psi and a minimum normal operating pressure of- 50 mg/L - Answer Before a new or repaired water line is placed into service, it must be properly disinfected by providing a chlorine dosage of _____ and proper detention time. Aquifers - Answer Water bearing formations beneath the earth's surface that are used as a source of water for public water supplies are- Determine water levels in the well - Answer The purpose of an air line on a well is- Reduce the amount of sand pumped - Answer The mesh size is an important feature of a well screen because property sized openings should- pH, alkalinity, temperature, and chemical dosage - Answer When treating surface water, the process of coagulation will be most affected by the- When the loss of head gauge indicated between 6 and 10 ft. - Answer A rapid sand filter should be backwashed when- 0.2 mg/L free chlorine residual 0.5 mg/L chloramine residual for a surface water supply 0.8 mg/L chloramine residual when using chloramine treatment 0.5 mg/L free chlorine residual for a groundwater supply - Answer Which of the following is an acceptable disinfection residual at the far reaches of the distribution system- 8.34 lbs - Answer One gallon of water weighs- .433 lbs - Answer One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- 1000 ft - Answer A raw water intake structure may not be constructed within _____ feet of a boat ramp, dock, or marina Vertical Turbine Submersible - Answer Common Type(s) of pump(s) for use in water wells are- Hydrological Cycle - Answer _____ is the natural exchange of water between the earth and air. 24 hours - Answer If and when a health hazard contamination event occurs in a public water system, the operator must contact the state regulatory authority within ___ hours by telephone. Maintained at adequate pressure Pathogen free Contains a chlorine residual - Answer Potable water is that of- Blue babies - Answer Excessive nitrates in drinking water can cause a condition that affects infants under the age of 6 months. This condition is known as- Coagulation - Answer In surface water treatment the process of causing the fine particles in the water to join together to form larger heavier particles that settle in a clarifier is called- Jar test - Answer The test commonly used to determine the chemical dosage for the surface water plant is the ___ test. Can be filtered with additional treatment Cause mud balls and filter plugging - Answer Suspended solids are the solids portion that- Coliform - Answer A public water system is required to take samples of water for bacteriological analysis. The organism that is used as an indicator is called- Residual - Answer Chlorine dosage is demand plus desired ___ Stand pipe - Answer A storage vessel that is the same diameter from the ground to the top and is more than 20 feet but less than 85 feet is called a- 35 psi - Answer Potable water must be stored at an elevation at least 80.85 feet above the highest known connection to provide the minimum operating pressure of- Hydro pneumatic tank - Answer A water tank that uses compressed air over water to provide pressure is called a- 8.0% - Answer According to the lead and copper rule, pipe and fittings may not contain more than ___ lead or solder and flux may not contain more than 0.2% lead. Red - Answer When testing for chlorine residual DPD is used as an indicator, when DPD is added to water containing chlorine what color does the sample turn? Gate valve - Answer The most common valve(s) used for isolating a water leak is the ___ valve. Water hammer - Answer In the distribution system when a valve or hydrant is opened or closed too fast it could result in a- Centrifugal - Answer The most commonly used pump in the distribution system is- 250 - Answer A Texas Class D Certified Operator can operate a public water system up to ___ connections. 3 years - Answer All state of Texas Operator License's after issue are good for ___ years. Collect another sample at the site that tested positive plus one within five connections upstream and one within five connections downstream and re-submit - Answer After analyzing monthly bacteriological samples the operator is notified that one testing point tested positive. The operator should-