Class "C" Water Operator Test Questions and Answers Latest Updated 2024/2025 | 100% Correct | Graded A+

Class "C" Water Operator Test Questions and Answers Latest Updated 2024/2025 | 100% Correct | Graded A+. A common chemical used in the disenfection of a small water supply is- Calcium Hypochlorite A physical connection between a potable water supply and a house well would be- A Cross Connection The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria is called? Demand All of the following are Physical characteristics of Chlorine gas- Greenish Yellow color Heavier than air Pungent, Penetrating odor Corrosive Which of the following would be considered a part of a hypo-chlorinator system? Solution feed pump Class "C" Water Exam Questions and Answers Latest Updated 2024/2025 | 100% Correct | Graded A+ According to state requirements, all public water supply wells should be provided with a raised concrete sealing block, screened vents and- Flow measuring device The drawdown of a water well is determined by- The difference in static and pumping levels The pH of water indicates- If it is more acidic or base The pH of water is expressed by a scale of numbers ranging from- 0-14 Water that is considered neutral is expressed on the pH scale at- 7.0 Which of the following is a required step in collecting a routine distribution sample for bacteriological testing? Use of an approved, sterile container Sand filtration will remove which of the following from surface water? Turbidity Activated Carbon is used in a Surface Water Plant primarily for? Taste and Odor control Which of the following chemical(s) are commonly used as coagulants in surface water treatment? Alum and Ferric Chloride Ground storage tanks are required to be provided with which of the following? Screened Vents An approved locking roof hatch An overflow pipe with hinged flap device Annual inspection and maintenance as needed An elevated storage tank should be protected against corrosion by- Painting Cathodic protection Water stabilization A public water supply system should maintain residual pressure of 20 psi and a minimum normal operating pressure of- 35 psi 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. 50 mg/L Water bearing formations beneath the earth's surface that are used as a source of water for public water supplies are- Aquifers The purpose of an air line on a well is- Determine water levels in the well The mesh size is an important feature of a well screen because property sized openings should- Reduce the amount of sand pumped When treating surface water, the process of coagulation will be most affected by the- pH, alkalinity, temperature, and chemical dosage A rapid sand filter should be backwashed when- When the loss of head gauge indicated between 6 and 10 ft. Which of the following is an acceptable disinfection residual at the far reaches of the distribution system- 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 One gallon of water weighs- 8.34 lbs One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- .433 lbs A raw water intake structure may not be constructed within _____ feet of a boat ramp, dock, or marina 1000 ft Common Type(s) of pump(s) for use in water wells are- Vertical Turbine Submersible _____ is the natural exchange of water between the earth and air. Hydrological Cycle 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. 24 hours Potable water is that of- Maintained at adequate pressure Pathogen free Contains a chlorine residual Excessive nitrates in drinking water can cause a condition that affects infants under the age of 6 months. This condition is known as- Blue babies 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- Coagulation