Class B Drinking Water Practice Test, Categorized
Class B Drinking Water Practice Test, CategorizedCorrosion Control_________ of 11 questions1. Aluminum, zinc, and magnesium are often used as anodes to prevent corrosion to other metals. Where do aluminum, zinc, and magnesium place in the galvanic series? A. As the least active metals B. As the noble metalsC. As the most active metals D. In the middle of the galvanic series2.In the corrosion cell, the anode is the A. negative poleB. positive pole C. medium pole D. north pole3.Metallic corrosion in potable water is always the result of A. a biochemical reaction B. a biological reaction C. a photosynthetic reactionD. an electrochemical reaction4.What is the Langelier Index if the if the initial water pH 8.1 and finished water sample pH is 8.9?A. +0.8 B. -7.3 C. -0.8 D. +175.Special steel specimens called coupons are inserted into a water main. After several months, the specimens are removed from the main. All coupons have lost weight over the period of time. What does this indicate? A. The water is scale forming B. The water is stableC. The water is corrosive D. The water is supersaturated6.The location where metal is lost in a corrosion cell is called theA. anode B. cathode C. electrolyte D. dielectric7.The operator of the water system is experiencing an increased amount of water leaks in the system, and lab results for lead and copper show an increase in both over time. The operator suspects corrosion is taking place in the system. Which lab tests listed will help confirm that corrosion is taking place? A. Dissolved oxygen, TDS, temperature B. Temperature, pH, ammonia C. Dissolved oxygen, alkalinity, temperatureD. Dissolved oxygen, pH, coupon analysis8.The reaction of dissolved oxygen with ferrous ions is reduced during which condition? A. High pH valuesB. Low pH values C. Low flow velocity D. Low water temperatures9.What is the term for an insulator used to prevent corrosion by separating two dissimilar metals?A. dielectric B. sacrificial cathode C. sacrificial anode D. inhibitor10.Which chemical can be used to mask red water problems by bonding with iron, but could increase corrosion by reducing effective calcium carbonate scale forming ability? A. Sodium hypochlorite B. Hydrofluosilicic acidC. Sodium hexametaphosphate D. Zinc orthophosphate11.Which element is considered to be the most corrosive component of water chemistry? A. Lead B. Copper C. Carbon monoxideD. OxygenDisinfection and DBPs____________of 10 questions1. A dosage of three parts of chlorine to one part ammonia will form what compound?A. monochloramine B. dichloramine C. trichloramine D. nitrogen trichloride2.According to FAC Chapter 62-550, Table 3, Maximum Contaminant Levels for disinfection byproducts, what is the MCL for total trihalomethane (TTHM)? A. 0.006 mg/LB. 0.080 mg/L C. 0.1 mg/L D. 10 mg/L3.CT Values are calculated using what two pieces of data? A. Chlorine demand and contact timeB. Chlorine concentration after contact time and the total detention time C. Concentration of chlorine and temperature D. Chlorine demand and temperature4. If a victim of chlorine exposure has slight throat irritation, relief can be accomplished by drinking what? A. Orange juice B. Coffee C. WaterD. Milk5.The addition of sodium hypochlorite or calcium hypochlorite will have what effect on pH?A. Increase pH B. Reduce pH C. Will raise alkalinity, but not pH D. These chemicals have no effect on pH6.The chlorine residual is dropping in the system. The chlorine feed is NOT the problem, the one-ton chlorine container is full and the ejector is working properly. What is causing the low residual? A. Chlorine icing causing low feed rate B. Low vacuum in the feed water to the ejectorC. Hydrogen sulfide entering the system from the well D. The pH of the source water is too low7.To reach breakpoint, enough chlorine must be fed to overcome what? A. Chlorine dosageB. Chlorine demand and chloramines C. Chlorine dosage and chlorine residual D. Free chlorine and chlorine demand8.What is an advantage of using chlorine dioxide as a disinfectant at the water plant? A. Chlorine dioxide is much more effective than chlorine at pH ranges of 6.5 to 5.5 B. Chlorine dioxide can be shipped and stored easier than chlorineC. Chlorine dioxide does not form trihalomethanes D. Chlorine dioxide is less expensive than chlorine9.Which condition causes faster formation of TTHMs? A. Low pHB. High pH C. Low Temperature D. High hardness10.Which of the following processes is effective in removing TTHMs after they have formed? A. Reverse osmosis B. Forward osmosisC. Aeration D. Coagulation, flocculation and sedimentationLime Soda Softening and Ion Exchange Softening__________ of 10 questions1.If there are more hydroxyl ions in a solution than hydrogen ions, the solution is: A. AcidicB. Basic C. Neutral D. Stable2.In the ion exchange process for hardness removal, which ions are being exchanged? A. ammonia and ammonium are exchanged with chlorineB. calcium and magnesium are exchanged with sodium C. calcium and hydrogen are exchanged with chloride D. sodium and chloride are exchanged with calcium and nitrogen3.The addition of lime during the softening process will cause which reaction? A. Non-carbonate hardness will convert to non-carbonate alkalinity B. Magnesium carbonate will convert to magnesium bicarbonateC. Bicarbonate alkalinity will convert to carbonate alkalinity D. CO2 will form4.The finished water leaving the ion exchange unit is considered: A. StableB. Corrosive C. Supersaturated D. Scale forming5.The main reason for using soda ash in the softening process is to: A. Absorb CO2B. Remove non-carbonate hardness C. Adjust corrosion index to the scale-forming side D. Maintain proper sulfate to carbonate ratio6.The operator of the ion exchange water treatment plant notices that one of the ion exchange units has a finished water hardness of one grain. What should be done? A. Immediately begin brine, rinse and backwash procedures B. immediately take the unit out of service and regenerate the activated carbon mediaC. Nothing. Monitor finished water and begin backwash when finished water grains increase over one GPG. D. Nothing. Monitor finished water and begin backwash when finished water grains increase over 20 GPG.7.Which of the following is present when the pH is over 8.3?A. Bicarbonate B. Carbon dioxide C. Sulfur dioxide D. Carbon monoxide8.The operator finds that the hardness of the finished water of his lime softening treatment process is near the hardness of the raw water, and the process appears to have failed. What could be the problem with the lime softening process? A. Ca and Mg have gone back into solution due to an excessive dose of potassium permanganate in the source water B. Too high of a lime dose has caused the hardness leaving the process to be near zero, thereby consuming all the alkalinity needed for softeningC. Too high of a carbon dioxide dose reduced the pH too rapidly causing the Ca and Mg to dissolve back into solution D. Too low of a carbon dioxide dose increased the pH to the point where Ca and Mg cannot re-dissolve and precipitate out9.When there is no phenolphthalein (P) alkalinity present in the sample, then it is assumed A. There is carbonate alkalinity present, but no hydroxide alkalinity present B. There could be some carbon dioxide and hydroxide alkalinity present C. All the alkalinity is in the hydroxide (OH-) formD. All the alkalinity is in the bicarbonate (HCO3-) form10.What is an advantage of using the split lime treatment method?A.Split lime treatment eliminates the need for soda ashB.Only 20% of the hard source water needs to be treated with excess limeC.Split lime treatment eliminates the need for quicklimeD.Split lime treatment can eliminate the need for recarbonationCoagulation / Flocculation_______ of 7 questions1.A cationic coagulant is A. Neutrally chargedB. Positively charged C. Negatively charged D. Not charged2.During routine walk through rounds of the treatment plant, the operator notices tiny alum floc formation in the flocculation basin. This condition indicates:A. The chemical dosage is too low B. The chemical dosage is too high C. The chemical dose is just right D. The speed of the mixer is too low3.Jar test results indicate that about 80% of the floc has settled within one or two minutes after the mixing is stopped. What does this indicate? A. The coagulant dose is too low and should be increased B. The coagulant dose is at the optimum setting C. The coagulant dose is too high, and should be increasedD. The coagulant dose is too high and should be decreased4.The appearance of fine alum particles washing over the effluent weirs of the sedimentation basin could be an indication of what?A. The alum dosage is too high B. The alum dosage is too low C. The coagulant aid is being over-dosed D. The detention time is too long5.Turbulence in flocculation basins can be reduced by gradually reducing the speed of mixers in each succeeding basin. This is called: A. Short circuiting B. Flash mixingC. Tapered-energy mixing D. Vertical mixing6.Which condition would require the mixing speed to be increased? A. Warm inlet water temperaturesB. Low inlet water temperatures C. High source water pH D. When floc breakup is observed7.The temperature of the influent source water to the surface water treatment plant has decreased and the quality of the floc produced by the coagulation/flocculation process is deteriorating. Jar test results indicate the coagulant dose is at optimum. The operator has increased the speed of the flocculators, however the process is still failing. What could be done to improve the condition?A.Increase the flow rate through the plant to increase detention time in sedimentation basinB.Decrease the flow rate through the plant to increase the detention time in sedimentation basinC.Increase the dosage of the coagulantD.Increase the pre-chlorination dosage and decrease the coagulant doseFiltration________ of 8 questions1.As filtration rates increase to over 5 gpm/sq ft, the operator of the dual media filter notices increasing finished water turbidity in the filter effluent and shortened filter runs due to shearing of the iron flocs. What can be done upstream of the filters to improve the poor filter performance? A. Immediately reduce the iron salt dose B. Immediately increase the iron salt dose C. Increase the flash mix and flocculator speedD. Add a polymer coagulant aid to strengthen the floc2.As the uniformity coefficient decreases, what effect does this have on the relative size of the filter media?A. Media particle size becomes more uniform (closer to the same size) B. Media particle size becomes less uniform (greater variation in size) C. Effective size and specific gravity increases D. Effective size and specific gravity decreases3.Direct filtration can be used where the A. Finished water is low in turbidity, color, algae, and coliforms B. Source water is low in mercury, color, hardness, and spongiformsC. Source water is low in turbidity, color, algae, and coliforms D. Source water is low in pH, alkalinity, and hardness4.Mud ball formation, filter media cracks or shrinkage are generally due to what condition? A. Poor media selection and specific gravityB. Poor media backwashing practices C. Long filter run times D. Under-dosing coagulant chemicals5.What is an advantage of a dual media filter?A. Longer filter run times between backwashes B. Longer backwash cycles to properly clean media C. Less chance of mud balls in media D. Reduced time to reach maximum head loss6.What problem occurs when backwashing an air-bound filter? A. Dissolved air prevents the backwash water from flowing through the media B. Excessive filter cracking occurs C. Mud ball formation is increased, making the filter unusableD. Media becomes suspended in the wash water and flows out of the filter7.When a filter is operated to a head loss that exceeds the head of water over the media:A. Dissolved air will be released causing air binding B. Air will become dissolved and pass through the filter, causing high NTU readings C. The media will not reset itself after backwashing D. The filtration rates will be improved, allowing longer filter run times8.Why does filtration typically follow PAC addition in a water treatment plant? A. Filters are necessary to provide the contact time for PAC to be effective.B. PAC creates turbidity which must be removed before distribution. C. Chlorine in the filters will deactivate the PAC. D. The PAC must be applied as a “cap” on the filter media for it to be effective.Reverse Osmosis / Desalination________ of 4 questions1.The "Christmas Tree" layout used in RO membrane staging allows for A. Up to 50% recovery of feedwater as product water B. 100% recovery of feedwater as concentrateC. 85% recovery of feedwater as product water D. Highest flux rate possible2.The application of sodium hexametaphosphate to the feedwater of an RO membrane helps to A. Decrease the precipitation of organic matter on the membrane B. Increase the amount of flux rateC. Decrease the amount of calcium sulfate precipitation on the membrane D. Decrease the temperature and pH, allowing higher flux rates3.The increasing tendency for precipitation of sparingly soluble salts and deposition of particulate matter on the membrane surface is called A. CompactionB. Concentration polarization C. Hydrolysis D. Demineralization4.Why are acids commonly fed into the feedwater of an RO unit? A. To increase alkalinityB. To protect membranes from damage by hydrolysis C. To protect membranes from damage by chlorine D. To decrease dissolved solidsLaboratory and Sampling________ of 4 questions1.An instrument used to measure the color intensity of a chemical solution is called? A. An amperometric titratorB. A spectrophotometer C. A buret D. An atomic absorption analyzer2.The main instrument used in the Threshold Odor Number analysis is? A. A mass spectrophotometerB. The human nose C. A turbidimeter D. A pH meter3.What is the antidote for all acids? A. FlushingB. Neutralization C. Chelation D. Oxidation4.Why is sodium thiosulfate added to sample bottles or sample bags used for total coliform testing? A. Sodium thiosulfate increases chlorine efficiency in the absence of air B. Sodium thiosulfate neutralizes only chloramine residualC. Sodium thiosulfate neutralizes all chlorine residual present D. Sodium thiosulfate is a method of pretreatment for coliform group bacteriaFDEP Rules and MCLs________ of 4 questions1.According to FAC Chapter 62-550, Table 1, Maximum Contaminant Levels for Inorganic Compounds, what is the MCL for nitrate? A. 0.2 mg/L B. 4.0 mg/LC. 10 mg/L D. 15 mg/L2.According to FAC Chapter 62-550, Table 6, Secondary Drinking Water Standards, what is the MCL for color? A. 0.2 color units B. 4.0 color units C. 10 color unitsD. 15 color units3.According to FAC Chapter 62-550, Table 6, Secondary Drinking Water Standards, what is the MCL for iron (Fe)? A. 0.080 mg/L B. 0.2 mg/LC. 0.3 mg/L D. 4.0 mg/L4.According to FDEP Chapter 62-602 FAC, an operator could have his/her license permanently revoked for doing what?A. Falsified or misrepresented reports, logs, or lab sheets B. Cheating on an exam C. Incompetence in operation of a water treatment plant D. Submitting false data on license applicationDrinking Water Math__________ of 10 questions1.An ion exchange softener contains 50 cubic feet of resin with a hardness removal capacity of 20,000 grains/cu ft of resin. The water to be treated has a hardness of 300 mg/L as CaCO3. How many gallons of water can be treated before the softener needs to be regenerated? Select the closest answer.A. 57,140 gallons B. 1,000,000 gallons C. 33,330 gallons D. 570,000 gallons2.Calculate the detention time in hours of the sedimentation tank that is 120 feet long, 40 feet wide and 12.5 feet deep. The flow rate into the tank is 3.0 MGD. Select the closest answer. A. 0.5 hours B. 1.5 hours C. 2.5 hoursD. 3.6 hours3.Calculate the dosage, mg/L, of copper sulfate being used to treat a reservoir. Water quality data is given below:Reservoir = 6 acresPounds of CuSO4 applied = 1,772 lbs.Water volume treated = 8.5 MGA. 2 mg/LB. 25 mg/L C. 50 mg/L D. 250 mg/l4.Calculate the percent recovery of the reverse osmosis unit if the feed flow is 5.88 MGD and the product flow is 5.0 MGD? Select the closest answer. A. 11.7% B. 30%C. 85% D. 115%5.Calculate the required bypass flow rate in gallons per day, for the ion exchange treatment plant if the desired hardness is 70 mg/L as CaCO3, the raw water has a hardness of 187 mg/L as CaCO3 and the total flow through the plant is 3.5 MGD? Choose the closest answer. A. 1.31 gpd B. 250,000 gpdC. 1,300,000 gpd D. 4,095,000 gpd6.How many gallons of sodium hypochlorite at 15% available chlorine will be used per day at the water treatment plant that treats 22 MGD to a dosage of 6.0 mg/L? Assume the weight of NaOCl to be 8.34 lbs/gal. Select the closest answer. A. 1,100 gallons per day B. 730 gallons per day C. 198 gallons per dayD. 880 gallons per day7.How many milligrams per liter of hardness are there if the water contains 14 grains of hardness? A. 0.8 mg/L B. 1.2 mg/L C. 24 mg/LD. 239 mg/L8.What is the pHs if the Langelier Index is 0.42 and the initial pH is 7.7? A. 8.12B. 7.28 C. 3.24 D. 7.669.How many pounds of CuSO4 must be added to the reservoir to control algae in the top 2.5 feet of water depth? The reservoir surface area is 8 acres with a maximum depth of 83 feet. The CuSO4 is dosed at 25 ppm. A. 12.5 lbs CuSO4B. 1,360 lbs CuSO4 C. 4,550 lbs CuSO4 D. 28,695 lbs CuSO410.What is the required dosage of soda ash in mg/L to remove 48 mg/L of non-carbonate hardness?A. 51 mg/L B. 45 mg/L C. 95 mg/L D. 74 mg/LSafety________ of 2 questions1.A fire has started in the electrical MCC room in one of the control panels. Which fire extinguisher should NOT be used to fight the fire? A. Halon B. CO2 C. Dry chemicalD. Pressurized water2.What are some of the first signs of hydrofluosilicic acid inhalation? A. Vomiting, nausea B. Vomiting, diarrheaC. Irritation of nose and throat, nosebleed D. Irritation of skin, itching and hivesMiscellaneous________ of 5 questions1.Activated alumina is effective at removing which contaminant?A.AluminumB.NitrateC.TrihalomethaneD.Arsenic2.A water sample has been filtered for an analysis of color. Which type of color will be determined?A.True colorB.Total colorC.Apparent colorD.Spectrophotometric color3.Which statement is true about dry chemical feeders?A.Gravimetric feeders are less accurate than volumetric feedersB.Volumetric feeders are more expensive than gravimetric feedersC.Gravimetric feeders are usually more accurate than volumetric feedersD.Gravimetric feeders are less expensive than volumetric feeders4.In the event of significant fluoride chemical overfeeding, what should be done?A.Decrease the dosage and increase finished water pHB.Shut down the plant, notify local and state health departmentsC.Notify the shift supervisor and issue a boil water noticeD.Decrease the dosage, use activated carbon to absorb the excess fluoride 5.Why must sludge from a treatment plant using aluminum sulfate (alum) not be applied to agricultural land?A.Alum sludge will react with calcium in the soil and start a fireB.Alum sludge will tend to harden the soilC.Alum will cause an increase in THM precursors in the groundwaterD.Excessive aluminum will accumulate in the cropsWater Treatment Methods __________ of 3 questionsThe groundwater source is high in hydrogen sulfide, iron and manganese. Which water treatment methods and operation sequence will be effective to remove these contaminants?Ion exchange, followed by aeration then disinfectionDisinfection, greensand filtration, then aerationOzone addition, aeration, then disinfectionChemical oxidation followed by greensand filtration, then disinfectionA brackish water source has high amounts of chloride, TDS, organic acids, turbidity, color and bacteria. Which treatment methods would be effective to treat this water?Flash mixing, flocculation, sedimentation, filtration, reverse osmosis, pH adjustment, disinfectionLime / soda softening, direct filtration, microfiltration, disinfectionPre-chlorination, reverse osmosis, aeration, greensand filtration, ion exchange, disinfectionPAC addition, reverse osmosis, greensand filtration, disinfectionA groundwater well is producing water with the following lab results:Dissolved iron, Fe:0.01 mg/LHydrogen sulfide, H2S:0.05 mg/LpH:7.85Temperature, oC19.5Total alkalinity, CaCO3:145 mg/LTotal hardness, CaCO3:108 mg/LTrue color, units:2.5 CUManganese, Mn0.004 mg/LNitrate, N:0.06 mg/LTurbidity, NTU:0.35Bacteriological, CFU:Non detectWhich treatment method(s) should be used for this water source?Lime/soda softening, direct filtration, microfiltration, disinfectionExcess lime addition softening, soda ash addition, disinfectionSpecific ion exchange for nitrate removal, greensand filtration disinfectionDisinfection onlyClass B Drinking Water Practice Test Answers, CategorizedCorrosion ControlCBDCCADBACDDisinfection and DBPsABBDACBCBCLime Soda Softening and Ion Exchange SofteningBBCBBCACDDCoagulation/FlocculationBADACBBFiltrationDACBADABReverse Osmosis/DesalinationCCBBLaboratory and SamplingBBBCFDEP Rules and MCLsCDCADrinking Water MathADBCCDDBBASafetyDCMiscellaneous1.D2.A3.C4.B5.BWater Treatment Methods1.D2.A3.D ................
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