Class C Water Operator - 600 Study Questions With Correct Answers

What is an Ampere? - Answer a unit of measurement for current Which of the following is a type of pump that is commonly used in a water treatment plant? - Answer Centrifugal What is a multi-staged pump? - Answer has more than one impeller if the pump impeller is running backwards, what action must be taken to correct the rotation? - Answer switch any two electrical leads When should the packing of a pump be adjusted? - Answer when the pump is running when a pump fails to deliver at its rated capacity, what is most likely the cause? - Answer air leak what is a common cause for vibrations in a motor? - Answer misalignment of the couplings What is the purpose of the wear rings in a pump? - Answer Plug internal leakage what should the seal water pressure be for a pump? - Answer 5 psi higher than the pumps discharge pressure what is the purpose of the seal water? - Answer block out air intake and lubricate the packing what is the recommended maximum suction lift? - Answer 15 ft. In a water treatment plant, what type of pump is commonly used to deliver chemical solutions? - Answer Positive displacement when should you lubricate your equipment? - Answer follow the manufacturer's recommendations In what manner is packing installed? - Answer a strip at a time and staggered a positive displacement pump should never be operated________? - Answer against a closed discharge valve if two of more pumps of the same size and purpose are online, what method of operation is recommended for them? - Answer alternate to equalize wear If half of the mechanical seal fails, what corrective action should be taken? - Answer change both halves of the seal what is the purpose of a lantern ring? - Answer water seal The packing of a pump should be adjusted to _________? - Answer allow a slight operating leakage and allow approximately a drip per second. On a multiple drive motor, when a belt fails, what corrective action should be taken? - Answer Replace all the belts on the drive To keep a centrifugal pump primed, install a _______ valve at the end of the suction line. - Answer foot valve If a motor fails to start, what should be checked first? - Answer Power supply Opening or closing a valve rapidly will cause? - Answer water hammer The formation and collapse of a gas pocket or bubble on the blade of an impeller is called? - Answer cavitaion Changing the packing on a pump is called ________ maintenance - Answer corrective what is an example of a daily maintenance task for a compressor? - Answer drain the air receiver what type of valve is usually used to control the rate of flow? - Answer globe valve what type of valve is buried? - Answer non-rising stem what is the most common valve type used in a water treatment plant? - Answer gate valve what will happen if the gate valve is left half open to control flow? - Answer Undue seat wear In what manner should carbon be stored? - Answer on concrete floor in single rows what is brinelling? - Answer a type of bearing wear what is the recommended manner for storing potassium permanganate? - Answer on a concrete floor away from heat or heated pipes what causes more damage to a pump's impeller? - Answer Air What is the unit of electrical resistance? - Answer Ohm What is an ammeter - Answer measures amps and current what type of electrical service is usually found in water plants? - Answer three phase Generally, all motors over over two HP require what type of electrical service? - Answer 3 phase Before starting work on any electrical equipment, you must first ____? - Answer Lock out tag out What unit is used to measure the rate of power Consumption? - Answer Kilowatts What is the function of a shear pin? - Answer to prevent damage to equipment when there is an overload The measurement of how close an instrument determines the true of actual reading of an instrument is called? - Answer Accuracy The readout of an instrument by the use of a pointer against a scale is an _____ reading? - Answer analog The device that controls the operation of equipment is called? - Answer controller The readout of an instrument by a direct numerical reading of the measured value id called a ________ reading? - Answer digital what is an instrument's ability to measure a process value and repeatedly obtain the result called? - Answer precision what is the difference between the actual value and desired value? - Answer drift what is software? - Answer computer programs A device that measures the accumulative amount of a process over a 24 hour period is called? - Answer Totalizer What is the Williams-Steiger Federal law known as today? - Answer OSHA Who is responsible for your safety in the workplace? - Answer yourself your should never add _____ to acid because it will cause a violent reaction. - Answer water what two chemicals widely used in water treatment will cause an explosion when mixed? - Answer lime and alum (base and acid) what is usually the first indication of a carbon fire? - Answer heat what type of fire extinguisher is used for a carbon fire - Answer carbon dioxide what percentage of oxygen is there in air? - Answer 20.9% Broken laboratory glassware should be ____ to avoid injuries. - Answer flame polished recommended fluoride control limits are based on which of the following? - Answer annual average maximum daily temperatures how many pounds of CL2 can you withdraw from a 150 lb cylinder in a day? - Answer 40 how many pounds of CL2 can you withdraw from a one ton cylinder in a day? - Answer 400 chlorine is ____ times heavier than air? - Answer 2.5 One liter of liquid chlorine will expand to ______ liters of chlorine gas. - Answer 450 The chlorine dosage minus the chlorine residual id the formula for the _____. - Answer Demand NaOC1 is the chemical formula for ______? - Answer Sodium Hypochlorite HOC1 is the chemical formula for _____? - Answer Hypochlorous Acid OC1 is the chemical formula for ______? - Answer Hypochlorite H2S is the chemical formula for_____? - Answer Hydrogen sulfide How many parts per million of chlorine will it take to oxidize 1 ppm hydrogen sulfide to elemental sulfer? - Answer 2.08 how many parts of chlorine will it take to oxidize 1 ppm of H2S to sulfate? - Answer 8.32 (CA(OH)2) id the chemical formula for ? - Answer calcium hydroxide the by-product of slaked lime is? - Answer heat preventative maintenance for a gate valve includes? - Answer opening and closing corrective maintenance for a gate valve includes? - Answer packing replacement and handle replacement Lauryl Triptose is used in to ____ stage of the MPN test. - Answer presumptive Brilliant green bile broth is used in the ___ stage of the MPN test. - Answer Colilert what does it mean if every tube in the MPN test confirmed state has gas? - Answer the test is invalid what test can measure total and fecal coliform at the same time? - Answer Colilert an organism found in the intestines of human beings and animals, and in plants, land, and air is called? - Answer Coliform An organism found only in the intestines of warm blooded animals is called? - Answer fecal coliform the best test to measure the effectiveness of a WTP's process is? - Answer turbidity the number of monthly samples for coliform analysis is based on? - Answer population served when 40 or more coliform samples are taken, you can have_____ positive - Answer 2, or 5% at the extremes of the distribution system you must have at least a ____ free CL2 residual. - Answer 0.2 E-coli broth is used when testing for____. - Answer fecal coliform chlorine should never be fed ahead of ___? - Answer polyphosphates the distribution system has complaints of pink water. The WTP has a greensand filter. What is most likely the cause? - Answer overdose of potassium permanganate the addition of chlorine to water until the demand is satisfied and every drop of water after that is free residual is called? - Answer break point chlorination adding alum to water _____ the PH level. - Answer lowers a common membrane used in reverse osmosis water treatment is____. - Answer cellulose acetate all surface water and ground water under the influence of surface water must be _______. - Answer disinfected and filtered. to obtain a "C" water license, an operator must have ________ hours of on the job training. - Answer 2,080 what is the action level for lead? - Answer 0.015 mg/l what is the maximum chlorine residual level allowed in the distribution system? - Answer 4.0 mg/l for water systems using chlorine dioxide, what is the MCL for chlorite? - Answer 1.0 mg/l what is the MCL for color? - Answer 15 the MCL for turbidity is not more than ____ NTU as a monthly average - Answer 0.5 the WTP uses 360 gallons of 10% NaOCl a day. how many pounds of CL2 do they use? - Answer 300 are you going to pass this test? - Answer Yes you are! the WTP totalizer read 0129 at the beginning of the first shift for the month and 0000 at the end of the last shift for the month. How many gallons of water were treated daily? - Answer 0.329 MGD what is the marble test used for? - Answer determine if water is scale forming or corrosive using the membrane filtration method, what is the incubation temperature for the total coliform test? - Answer 35.0 degrees C. plus or minus 0.5 degrees C for the membrane filtration method, what is the incubation period for total coliform? - Answer 24 hrs + or - 2 hrs with the membrane filtration method, what is the incubation time for the fecal coliform test? - Answer 24 hrs + or - 2 hrs what is the molecular weight of Na2CO3? (N=23, C=12, O=16) - Answer 106 who had a better career? Kobe or Tim Duncan - Answer Tim Duncan What is Texas Independence Day? - Answer March 2nd, 1836 what are the criteria used to classify water treatment plants? - Answer size and process used when NaOCl is added to water, what reaction takes place? - Answer PH increases what happens when HOCL is added to water? - Answer PH decreases what is a common level control device used in water treatment plants? - Answer ball floats a water system that has at least 15 service connections used by all year residents or regularly serves at least 25 year round residents is called? - Answer community system a system that has at least 15 service connections, or regularly serves an average of at least 25 individuals daily at least 06 days out of the year is a ______ system? - Answer public the chief operator for a class "B" WTP needs what level of license? - Answer B a "B" class WTP must have a "C" operator or higher on duty for ______. - Answer 16 hrs a day / 7 days a week what is the most effective PH range for iron removal? - Answer 8 to 9 a successful method for removing H2S from water with a Ph of 9.4 is to ? - Answer increase aeration adding sodium aluminate to water will? - Answer increase PH what is the lowest hardness achievable by the lime or lime-soda ash process? - Answer 30-40 when you are gathering the monthly coliform samples, what other test/sample must be taken? - Answer chlorine residual a natural underground layer of porous, water-bearing materials usually capable of yielding a large supply of water is called? - Answer an aquifer what is the most likely cause of black water in the distribution system? - Answer manganese and H2S specific conductance is an indirect measurement of ________? - Answer TDS what is the purpose of installing tube settlers? - Answer aid sedimentation how long does the coagulation process take? - Answer a few seconds during an inspection of the plant, you discover that a filter is air-bound. what action should you take? - Answer backwash the filter immediately. what will affect the efficiency of tube settlers? - Answer high wind how many zones are the in a sedimentation basin? - Answer 4 Aluminum sulfate is used as a coagulant because it has? - Answer trivalent ions the zeta potential and size of particles in water affect the? - Answer settling in the coagulation and flocculation process, the difference in the electrical charge between the dense layer of ions surrounding the particle and the charge of the bulk of the suspended fluid surrounding the particle is called? - Answer zeta potential the particles in water generally have a _____ charge. - Answer negative when water passes through an ion exchange resin bed, what is usually unaffected by the process? - Answer PH when water is softened using the ion exchange process, what substance will appear in the finished water? - Answer sodium in the split treatment process, what portion of the flow bypasses the treatment unit? - Answer 20% which of the following is a requirement for obtaining the "C" water license? - Answer high school deploma water pressure in the distribution system must never go below ____ PSI - Answer 20 you should avoid using polyphosphate that is over ______ hours old. - Answer 48 what is the third stage in the ion exchange process? - Answer brine a greensand filter is commonly used to remove? - Answer iron what chemical is used to regenerate greensand? - Answer potassium permanganate what is the largest cause of water borne illness in the united states? - Answer cross contamination water rights to a water supply, which are acquired for the beneficial use of water by following a specific legal procedure, are called? - Answer appropriative a connection between potable water and an unapproved connection is called? - Answer cross contamintaion the theoretical time it takes for a small amount of water to pass through a tank at a given flow rate is called? - Answer detention time water rights, which are acquired by diverting water an putting it to use in accordance with specified procedures, are called? - Answer prescriptive the drop in the water table or groundwater level when the water is being pumped from a well is called? - Answer drawdown what is the process of evaporation of water into air and its return to earth by precipitation called? - Answer hydraulic cycle the upper surface of the zone of saturation of ground water in an unconfined aquifer is called? - Answer water table water rights that are acquired together with title to the land boarding a source of surface water are called? - Answer riparian a water source that is under pressure greater than the atmosphere and will rise above the level of its upper confirming surface when given the opportunity is called? - Answer an artesian well the actual time in hours, minutes, seconds that a small amount of water is in a treatment basin or tank is called? - Answer detention time when is the drawdown of a well taken? - Answer when the pump is running what is the following formula used to determine? (tank Vol. * 24hrs/day)/flow, gal/day - Answer detention time the process by which water becomes gas is called? - Answer evaporation water that contains contamination, objectionable pollutants, minerals, or infective agents, and is considered unsafe for drinking is called? - Answer nonpotable when was the SDWA last ammended - Answer 1996 the annual quantity of water that can be taken from a water source over a period of years without depleting the water source permanently is called? - Answer safe yield the process of water vapor passing into the atmosphere from living plants id called? - Answer transpiration water that is at a desirable temperature, free from objectionable tastes and odors, looks good, and is pleasing to the senses is called? - Answer palatable water that does not contain objectionable contamination, pollution. or infective agents is called? - Answer potable the formation of separate layers of water in a lake or reservoir is called? - Answer stratification a detailed evaluation or inspection of a source of water? - Answer sanitary survey when does destratification in reservoirs or lakes typically take place? - Answer spring and fall (temperature change) from what level is water usually drawn for treatment after it has been stratified? - Answer middle what is the turnover of a lake due to the equalization of temperatures throughout the layers called? - Answer destratification the portion of a body of water that extends from shoreline to the limit of growth of rooted plants called? - Answer littoral what are reservoirs or lakes that are rich in nutrients called? - Answer Eutrophic what method of treatment will remove a fishy odor from the water? - Answer chlorination The development of vertical mixing within the lake or reservoir to eliminate separate layers of temperature, plant, or animal life is called? - Answer destratification the minimum odor of a water sample that can just be detected after successive dilutions with odorless water is the ___________. - Answer TON (threshold odor number) the addition of chlorine to water that has a medical odor to it will_________. - Answer intensify the odor. reservoirs and lakes that are nutrient poor, containing little or no plant or aquatic life are called? - Answer Oligotrophic what happens to the water during daylight hours when there is an algal bloom? - Answer PH increases when algae die off, bacteria that feed upon the algae use oxygen and can cause_______ that may result in fish kill. - Answer oxygen depletion a process in which organisms with the aid of chlorophyll, convert carbon dioxide and inorganic substances into oxygen and additional plant material, using sunlight for energy is known as? - Answer photosynthesis what is the difference between organic and inorganic matter? - Answer carbon what chemical is used to control algal blooms? - Answer bluestone what may interfere with the efficiency of copper sulfate? - Answer Alkalinity what type of device is used when drawing water from a surface water source? - Answer a single or multi-level intake structure good floc is observed forming in the flocculation basin. The size increases the later breaks up. What is likely the cause? - Answer floc mixer RPM too high during a plant tour, a lot of floc is observed flowing over the laundering weirs. what is the probable cause? - Answer Floc too light for detention time in a jar test, the floc starts to settle before the mixers are topped. what does this indicate? - Answer overdose if you're happy and you know it, clap your? - Answer hands what type of floc should form during coagulation? - Answer discrete and fairly dense you observe small and well dispersed floc entering the flocculation basin. what does this indicate? - Answer effective coagulation in a jar test, what does it mean after the mixers are stopped and 80% of the floc has settled within 15 minutes? - Answer good settling and test results water in the treatment unit has a milky of blueish tint. what is the probable cause? - Answer overdose of alum