Class "C" Water Exam with complete solutions.

Class "C" Water Exam with complete solutions. Calcium Hypochlorite - correct answers.A common chemical used in the disenfection of a small water supply is- A Cross Connection - correct answers.A physical connection between a potable water supply and a house well would be- Demand - correct answers.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 - correct answers.All of the following are Physical characteristics of Chlorine gas- Solution feed pump - correct answers.Which of the following would be considered a part of a hypo-chlorinator system? Flow measuring device - correct answers.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 - correct answers.The drawdown of a water well is determined by- If it is more acidic or base - correct answers.The pH of water indicates- 0-14 - correct answers.The pH of water is expressed by a scale of numbers ranging from- 7.0 - correct answers.Water that is considered neutral is expressed on the pH scale at- Use of an approved, sterile container - correct answers.Which of the following is a required step in collecting a routine distribution sample for bacteriological testing? Turbidity - correct answers.Sand filtration will remove which of the following from surface water? Taste and Odor control - correct answers.Activated Carbon is used in a Surface Water Plant primarily for? Alum and Ferric Chloride - correct answers.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 - correct answers.Ground storage tanks are required to be provided with which of the following? Painting Cathodic protection Water stabilization - correct answers.An elevated storage tank should be protected against corrosion by- 35 psi - correct answers.A public water supply system should maintain residual pressure of 20 psi and a minimum normal operating pressure of- 50 mg/L - correct answers.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 - correct answers.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 - correct answers.The purpose of an air line on a well is- Reduce the amount of sand pumped - correct answers.The mesh size is an important feature of a well screen because property sized openings should- pH, alkalinity, temperature, and chemical dosage - correct answers.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. - correct answers.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