Pool Operator's Final Exam Questions with Verified Answers

Pool Operator's Final Exam Questions with Verified Answers The percentage of hypoclorous acid formation is most influenced by: pH Pool painting is usually done: Before opening in the spring When a pool is chlorinated with gas chlorine, the operator must also use: Soda Ash The term "chlorine demand" refers to: The amount of chlorine which will react with substances in the pool Re-circulation pumps used in swimming pools are the type called: Centrifugal pumps Reversing the flow of water through the filters is called: Backwash "Slurry feed" or "body feed" refers to: Diatomite added during a filter run The term pH is determined by the concentration of: Hydrogen ions Because carbonate ions combine with hydrogen ions, sodium carbonate will cause pH to: Rise When enough chlorine is added to cause complete oxidation of all organic compounds, a sudden drop in residual chlorine may be noticed. The point at which this occurs is called the: Break- point "Residual chlorine" refers to: The amount left in the water after oxidation of organic material Which of the following is NOT considered a swimming pool disinfectant: Chlorinated hydrocarbons When chlorine is used as a disinfectant for swimming pools, the form in which it's disinfectant properties are the greatest is: Hypochlorous acid The chemical most commonly used to raise pH is: Sodium carbonate An example of a chemical used to stabilize chlorine is: Cyanuric acid The chemical reagent recommended by the health department to test chlorine residual in swimming pools is: D.P.D. The chemical reagent used most often to test pH in swimming pools is: Phenol red Considering all factors, which of the following would be the BEST range for pH in a swimming pool: 7.2-7.8 The minimum turnover rate to obtain 100% clarity in a pool is: Once in eight hours There is a noticeable odor of chlorine around your pool and bathers are complaining of eye irritation. Which of the following is most likely to solve the problem: Break point chlorination As pH increases, chlorine effectiveness: Decreases In a high-rate sand filter system, the tanks are backwashed: All at once The baffle in the filter tank is there to: Disperse water evenly over the surface of the filter media An access manhole is constructed on each tank