CPO Test-with 100% verified solutions-2023-2024, Exams of Health sciences

Download CPO Test-with 100% verified solutions-2023-2024 and more Exams Health sciences in PDF only on Docsity! CPO Test-with 100% verified solutions-2023- 2024 to lower pH add: muriatic acid carbon dioxide to increase pH add: sodium carbonate sodium hydroxide sodium sesquicarbonate the acceptable pH range is: a) 6.8-7.0 b) 7.2-7.8 c) 7.0-7.4 d) none of the above b) 7.2-7.8 the ideal pH range is: a) 7.4-7.6 b) 7.8-8.0 c) 6.8-7.4 a) 7.4-7.6 free chlorine is a(n): a) oxidizer b) stabilizer c) active disinfectant c) active disinfectant it is common practice to maintain free chlorine at: a) 1.0-2.0 ppm b) 2.0-4.0 ppm c) 5.0-7.0 ppm b) 2.0-4.0 ppm what is the maximum free chlorine that should be used? a) 6.0 ppm b) 1.0 ppm c) 5.0 ppm c) 5.0 ppm combined chlorine is NOT an effective: a) oxidizer b) stabilizer c) disinfectant c) disinfectant hypochlorous acid is a(n): a) oxidizer b) stabilizer c) disinfectant d) both A and C inorganic when free chlorine reacts with organic contaminants, ___________ chloramines form organic inorganic contaminants do NOT contain: a) oxygen b) carbon c) chlorine d) algae b) carbon what is the most common disinfectant? sodium hypochlorite what is commonly used to superchlorinate water? calcium hypochlorite CyA is typically used to protect chlorine from the effects of: UV light and sunlight bromine is a(n): a) oxidizer b) disinfectant c) stabilizer d) both A and B d) both A and B name the secondary disinfectants. ozone UV light chlorine dioxide PHMB factors that contribute to the balance of water are: pH total alkalinity calcium hardness temperature TDS corrosive water means the pH could be too ______. low scaling water means the pH could be too _______. high total alkalinity is made up of bicarbonate carbonate hydroxide ions what is the ideal level for total alkalinity? a) 80-120 ppm b) 100-120 ppm c) 40-100 ppm a) 80-120 ppm pH bounce happens when there is not enough _____________ ions to provide buffering of pH bicarbonate what do you add to increase total alkalinity? a) sodium hypochlorite b) UV light c) ozone d) sodium bicarbonate d) sodium bicarbonate release and oxidizer but not a disinfectant potassium monopersulfate is commonly used as a(n): a) oxidizing shock b) stabilizer c) disinfectant a) oxidizing shock the most common inorganic water clarifier is: aluminum sulfate test methods for water clarity colorimeter dip and read test strips titration turbidity water clarity disk a sample should be taken from a depth of at least ___ inches below the water surface and from a location well away from any return inlets. a) 20 b) 10 c) 18 c) 18 the use of _____ pH disinfectants will cause total alkalinity to drop. low disinfectant testing methods orthotolidine (OTO) DPD oxidation reduction potential (ORP) when testing the pH, the water will turn yellow if the pH is _____. 6.8 when testing the pH, the water will turn orange if the pH is ____. 7.6 when testing the pH, the water will turn red if the pH is _____. 8.4 conductivity meter calibrated with a solution of known conductivity what is the most common CyA testing? a) pH testing b) turbidimetric testing c) CO2 testing b) turbidimetric testing liquid solution feeders deliver a liquid chemical or liquid solution containing solid particles what is commonly used for the injection of sodium hypochlorite and liquid pH adjustment? positive displacement pumps the effectiveness of erosion feeders depends on: -solubility of chemical product -flow rate of the water through erosion device -total surface area of exposed chemical pellets what tablets are commonly used in erosion feeders? solid chlorine-releasing bromine-releasing types of erosion feeders: there must be 1 skimmer for each ______-______ square feet of water surface area or fraction of. a) 400-500 b) 800-900 c) 200-300 a) 400-500 the user displacement of a collection tank is ____ gallons of water per adult using the pool. a) 40 b) 10 c) 20 c) 20 what are the basic components of a pump? -volute/pump housing -shaft -mechanical shaft seals -motor adaptor and seal plate -impeller cavitation occurs when: the impeller is starved for water and can't maintain discharge requirements the common types of valves are: gate ball butterfly multiport globe check the velocity of water as it flows through a pipe is determined by: -the size of the pipe -the head pressure developed by the pump performance of erosion feeders is dependent on -water temperature -flow rate of water through device return wall inlets should be installed a minimum of ____ inches below the normal operating level. a) 10 b) 12 c) 14 b) 12 types of return inlets wall floor what are signs of poor circulation? -repetitive algae growth -lock of disinfectant residual in a particular location clarity and turbidity have a ____________ relationship. inverse filter media rate (FMR) the rate of flow of water through a filter what are the three most common filter media types? sand cartridge diatomaceous earth good water clarity is the result of proper: filtration circulation chemical treatment