Water Treatment practice Exam Questions and Answers 100% Pass

Water Treatment practice Exam Questions and Answers 100% Pass When measuring finished water, how often is it recommended to check turbidity? Continuously Which of the following chemicals is considered most dangerous to handle A) sodium chloride B) bicarbonate of soda C) caustic soda D) soda ash Caustic soda The ability to neutralize acids is called A) pH B) alkalinity C) Langlier Index D) hardness Alkalinity Which Emergency Kit should be used to repair a leaking 150 lb chlorine gas cylinder? A) kit A B) kit B C) kit C D) fire department kit Kit A To eliminate a build up of calcium deposits in filters A) wash filter B) backwash several times until gone C) wash filter with dilute acetic acid D) add a disinfectant C) wash filter with dilute acetic acid When testing a water sample for Dissolved Oxygen from a non-preserved bottle, what is the preferred holding time? Test immediately Lights are setup around the perimeter of a fence with a video camera at a treatment plant to provide luminescence for? Deterrence Where is the best place to read the amount of a sample on glassware? In the middle where the curvature meets the water (meniscus) What is the best way to check on a delivery of chemicals or materials once you meet the driver coming in? Ask to see the drivers credentials When performing a titration to determine total alkalinity, what is the point called where the indicator changes color? Endpoint The process of adding air to water or water to air is called? Aeration What will often cause erratic operations in a pneumatic instrument? A) high temp B) carbon dioxide in air supply C) over sized air supply D) oil in air supply D) oil in air supply According to the Safe Drinking Water Act what can help to provide corrosion control? pH & alkalinity Which type of pump can be severely damaged if starting up with a closed discharge valve? Positive displacement Which of the following chemicals is used to eliminate algae in a raw water source? A) phosphate B) Chlorine C) ammonia D) copper sulfate D ) Copper sulfate Which of the following is used to evaluate the filtration process? A) color B) hardness C) head loss D) temperature C) head loss Which of the following enhances the effectiveness of the aeration process? A) velocity of air flow B) number of splashes C) surface area between air and water D) mixing patterns C) surface area between air and water What is the best method to get rid of calcium deposits in a pump? Acid wash and rinse To maintain a magnetic flow meter, check Flow zero In a reverse osmosis system which of the following disinfectants are least likely to harm membranes? A) Chlorine gas B) ozone C) ultraviolet light D) sodium hypochlorite C) ultraviolet light What is the most important piece of diagnostic equipment used to evaluate a rapid sand filter? A) pH meter B) DO meter C) turbidity meter D) thermometer D) thermometer You receive customer complaints twice a year. Most likely cause is Thermal turnover You receive a report of dead fish in the reservoir. What is the most likely cause? Low dissolved oxygen A typical flow rate through a newly backwashed rapid sand filter would be 2.0 gpm/ft2 If your system was to experience a violation or violations, which of the following is the most serious regarding health risks? A) a tier 1 and a tier 2 B) a tier 2 and a tier 3 C) two tier 1 violations D) Two tier two violations C) two tier 1 violations When taking this type of sample you must always make sure there is NO air in the sample container Volatile organics When creating a slurry using Powdered Activated Carbon, which of the following is NOT required? A) explosion proof motor B) must use adequate contact time C) pH must be over 6.7 D) it must be removed before leaving the plant C) pH must be over 6.7 The action level for copper at the 90th percentile is? 1.3 mg/L Radioactivity is found in certain elements and compounds due to the release of energy from? Within the nucleus of the atom According to the Surface Water Treatment Rule, water systems serving a population greater than 500 persons must sample the filtered water for turbidity every 4 hours For surface water systems without filtration, the Surface Water Treatment Rule requires public water systems to Maintain a C x T value above the minimum value What U.S. agency establishes drinking water standards? U.S. EPA Surface water systems must treat at a minimum for Coilform bacteria and turbidity How is a public water system defined? Must have at least 15 service connects or serve at least 25 individuals at least 60 days per year What is the maximum contaminant level goal for chloride? 250 mg/L According to the Interim Enhanced Surface Water Treatment Rule, a public water system serving a population of 10,000 or more must maintain the combined effluent turbidity of direct or conventional filtration 95% of all measurements each month at Less than or equal to 0.3 NTU What does the abbreviation DPB stand for Disinfection by-product Because it is not possible to routinely test for the presence of specific microorganisms in drinking water, the U.S. EPA requires for surface water systems, the use of Treatment techniques Which of the following statements is true? A) A public water system is always a community water system B) A community water system is always a public water system C) A transient non-community water system is not a public water system D) Both non-transient non-community and transient non-community systems are not public water systems. B) A community water system is always a public water system