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Treatment 1/2 Practice Test 2
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Questions in this quiz (100)
1What is a pathogen?
- AAlgae
- BLaurel Tryptose
- CMTBE
- DDisease-causing microorganism
2What is the impact of algae to water quality?
- AElevated hardness
- BIncrease in Cryptosporidium
- CTaste and odor problems
- DCorrosively
3What is the concentration of chlorine gas?
- A12.5%
- B100%
- C65%
- D22.5%
4Which of the following is not used to mix coagulants?
- AHydraulic mixing
- BMechanical mixing
- CDiffuser
- DHorizontal paddle wheel
5What is considered to be a quick remedy to address a sudden increase in filtered water turbidity?
- AFeed a filter-aid chemical to the filter influent
- BIncrease plant flowrate
- CBackwash less frequently
- DReduce speed of rapid mixer
6What is the likely cause of pinging in a pump?
- AWater hardness
- BFrequent starting and stopping
- CCavitation
- DCorrosion
7Which of the following controls the efficiency of removing suspended solids in the sedimentation process?
- AMinimize mud ball formation
- BSodium hydroxide
- CFlowrate
- DProper backwashing
8What is a sanitary survey?
- AVulnerability assessment
- BAn analysis to determine all potential water quality impacts to a proposed well
- CSurvey conducted to find ways to reduce wastewater production
- DInvestigation to determine optimal location for water sampling station
9Which of the following categories does bacteria belong to?
- ADissolved
- BSettleable
- CInorganic
- DColloidal
10Under the Surface Water Treatment Rule, what must the reduction of viruses be through filtration and disinfection?
- A99%
- B99.99%
- C90%
- D95%
11Which of the following is not considered free residual chlorine?
- AHypochlorous acid
- BHyochlorite ion
- CMonochloramine
- DChlorine
12Why is coliform used as an indicator organism?
- AIt reduces the complexity and cost of analysis
- BIt is accurate in identifying the strain of virus
- CIt provides detailed information about the type of pathogens in the sample
- DIt provides the exact number of pathogens in the sample
13What is an example of a non-community, non-transient water system?
- ARest stop
- BSubdivision
- CRetirement community
- DSchool
14What is the purpose of packing in a pump?
- AIncrease the pressure and flow of a fluid
- BTransmit input per from the driver to the impeller/s mounted on the shaft
- CControl the leakage of water along the pump shaft and prevent air from entering along the shaft when the pump is in a suction lift condition
- DKeep the shaft or rotor in correct alignment with the stationary parts under the action of radial and transverse (axial) loads
15What does the addition of carbon dioxide do to the pH of water?
- ARaises it
- BLowers it
- CUnaffected by it
- DCreates instability of pH
16What is an unconfined aquifer?
- AOne in which groundwater is under pressure by overlying and aquitards
- BA well in which water rises under pressure from a permeable stratum overlaid by impermeable rock
- CA location where groundwater naturally emerges from the Earth's subsurface in a defined flow and in an amount large enough to form a pool
- DOne in which groundwater possesses a free surface open to the atmosphere
17What is a static water level in a well?
- AWater level when pump is not running
- BWater level when pump is running
- CThe midpoint of the aquifer
- DThe bottom of the zone of saturation
18Which of the following will least likely impact the formation of flocs during the coagulation and flocculation process?
- AAlkalinity
- BpH
- CTemperature
- DHardness
19What is formed when free chlorine reacts with ammonia?
- AAmmonia hydroxide
- BAmmonia chloroform
- CChloramine
- DAmmonium nitrate
20Which contaminant causes Blue Baby Syndrome?
- ACopper
- BNitrate
- CLead
- DArsenic
21What is free Chlorine?
- AThe residual chlorine existing in water in chemical combination with ammonia or organic amines
- BThe sum of free and combined chlorine
- CInorganic chloramines
- DThe concentration of residual chlorine in water which is present as dissolved gas, hypochlorous acid, and or hypochlorite
22What is a thermocline?
- AA thin distinct layer in a reservoir in which temperature changes more rapidly with depth than it does in the layers above or below
- BEpilimnion
- CHypolimnion
- DDeepest layer
23What agency protects the health and safety of industrial employees?
- APublic Utilities commission
- BEPA
- COSHA
- DNEPA
24What is the first priority in water treatment?
- AProduction of drinking water at a reasonable cost
- BProduction of safe drinking water
- CProduction of an aesthetically pleasing drinking water
- DProduction of drinking water that does not leave scale deposits
25What is the health effect of consuming water with high levels of lead?
- ABlue Baby Syndrome
- BBreathing problems
- CDiarrhea
- DCardiovascular effects, increased blood pressure and incidence of hypertension
26What is an imaginary surface to which groundwater rises under hydrostatic pressure in wells or springs?
- ADrawdown
- BRadius of influence
- CPumping water level
- DPiezometric surface
27What is used to evaluate new coagulants or polymers being considered for use at the plant?
- ADPD test
- BMPN method
- CJar test
- DColilert method
28What are the 4 zones of a clarifier?
- AInlet, Outlet, Settling, Sludge
- BInlet, Outlet, Settling, Skimming
- CInlet, Outlet, Settling, Baffles
- DSettling, Baffles, Skimming, Sludge
29Which type of filtration process is approved by the Surface Water Treatment Rule?
- ANanofiltration
- BConventional water treatment
- CIon Exchange
- DMicrofiltration
30Which of the following impacts the color of source water?
- ASodium
- BPressure
- COrganics, such as soil and leaves
- DTemperature
31Coliform is most likely to be found in which of the following water supplies?
- ADeep well
- BShallow well
- CArtesian
- DLake
32What is the amount of water than can be withdrawn from an aquifer without significant environmental impact?
- AWell drawdown
- BSafe yield
- CCone of depression
- DSpecific yield
33pH will increase if the following chemical is added to water.
- ACO2
- BIron
- CAmmonia
- DAcid
34Which of the following is an unstable form of disinfection?
- AOzonation
- BSodium hypochlorite
- CChloramine
- DUV
35How many stages are in a breakpoint chlorination curve?
- A3
- B2
- C1
- D4
36Chlorine demand is best described as which of the following?
- AChlorine dose + Chlorine residual
- BChlorine dose - Chlorine residual
- CChlorine dose X Chlorine residual
- DThe amount of chlorine required to linger in the pipeline
37What is an example of a natural organic matter?
- AIron
- BManganese
- CFallen leaves
- DArsenic
38What is a typical characteristic of a colloidal particle in raw water?
- APositive charge on the surface
- BNegative charge on the surface
- CNeutral charge on the surface
- DCationic attributes
39What is short circuiting in a clarifier?
- AElectrical problems in the control panel
- BNegative electrical charge on colloid
- CElectrical charge neutralized by alum
- DShorter settling time in basin
40What would cause a filter to begin backwashing?
- ALow chlorine concentration
- BPresence of THM
- CHead loss
- DTemperature
41What is the purpose of surface washing in a filtration unit?
- AClear under drain
- BExpand filter media
- CPrevent loss of media
- DBreak-up mud balls
42Where would you most likely see high levels of nitrate in the groundwater supply?
- ANear agricultural land
- BIn very deep wells
- CNear military bases
- DNear swamps
43What is adsorption
- AConstituents is sucked in
- BConstituents sticking to the surface of a substance
- CMolecule is converted from aqueous phase to solid phase
- DContaminant breaks up into smaller particles
44In which part of the water treatment plant are 99% of the suspended solids removed?
- ACoagulation
- BDisinfection
- CFlocculation
- DSedimentation and filtration
45Which of the following will most likely lead to the lowest concentration of THMs in treated water?
- ASodium hypochlorite
- BChlorine gas
- CChloramines
- DCalcium hypochlorite
46Which of the following is not true about the Total Coliform Rule?
- AUses a presence and absence approach
- BCompliance is determined on a monthly basis
- CEach total coliform-positive routine sample must be tested for the presence of fecal coliforms
- DSmaller systems that collect fewer than 40 samples cannot have coliform positive results in more than 2 samples per month
47Which of the following is true about fusible plugs on a chlorine container?
- AUse it as the point of connection
- BAlways remove it before use
- CNever remove it
- DShould be removed during maintenance
48What is the most common water quality complaint from customers?
- AColor
- BTaste and odor problems
- CScaling
- DCorrosion
49What information should be identified on the sampling container?
- ASampling location, date, and time
- BConcentration of all constituents
- CProbable cause of contamination
- DType of treatment used at the plant
50What is the standard requirement for conventional and direct filtration?
- AFiltered water must be less than or equal to 0.2 NTU in 95% of monthly measurements
- BFiltered water must be less than or equal to 1.0 NTU in 95% of monthly measurements
- CFiltered water must be less than or equal to 0.5 NTU in 95% of monthly measurements
- DFiltered water must be less than or equal to 0.3 NTU in 95% of monthly measurements
51What is the main drawback of using sodium hypochlorite to disinfect water?
- AExpensive
- BFormation of THMs
- CDifficult to procure
- DMost dangerous form of disinfectant to store at plant
52What is one of the causes of hardness of water?
- AArsenic
- BNitrate
- CCalcium
- DManganese
53Which chemical is used to raise the pH in water?
- ACitric acid
- BCarbon dioxide
- CSulfuric acid
- DSoda ash
54What is the purpose of flocculation?
- AMix coagulants with raw water
- BAdd chlorine prior to filtration
- CSlowly stir water to bring smaller flocs together to form larger ones
- DOxidize mineral
55Which of the following range of pH is considered to be acidic?
- A8-10
- B0-6
- C11-13
- D7
56What is the term used to describe the upper layer of a stratified reservoir?
- AEpilimnion
- BThermocline
- CHypolimnion
- DMetalimnion
57What is another name for the Multiple Tube Fermentation test?
- AMPC
- BMFF
- CMDS
- DMPN
58What impact does precipitated manganese have on water?
- ABrownish water
- BBlackish water
- CReddish water
- DNo impact
59Which of the following is not part of the Surface Water Treatment Rule?
- AApplies to all public water systems using surface water sources or ground water sources under the direct influence of surface water
- BRequires most water systems to filter and disinfect water from surface water sources or ground water under direct influence
- CEstablishes maximum contaminant level goals (MCLGs) for viruses, bacteria, and Giardia lamblia
- DAll water systems are allowed to use disinfection only for surface water sources that meet criteria for water quality and watershed protection
60What is a typical characteristic of chlorine gas?
- AGreenish yellow color
- BBlue color
- COrange color
- DBrown color
61Which of the following is not true about the Total Coliform Rule?
- AEach total coliform-positive routine sample must be tested for the presence of fecal coliform or E. coli
- BIf any routine sample is total coliform-positive, repeat samples are required.
- CEstablishes a maximum contaminant level (MCL) based on the presence of absence of total coliforms
- DMonthly sampling requirements are not based on population served
62What can be done to minimize the formation of THM?
- AIncrease the chlorination before filtration
- BIncrease precursors
- CEliminate or reduce chlorination before the filters
- DIncrease temperature
63What is the source of fecal coliform bacteria?
- ASand
- BFeces
- CLeaves
- DInorganic
64What is the drawback of using UV for disinfection?
- ADBPs
- BInvolves storage of toxic chemicals
- CHigh energy cost
- DLonger contact time required
65What are the two types of aquifers
- AConfined and unconfined
- BStatic and pumping
- CCationic and anionic
- DEutrophic and oligotrophic
66What is a common problem associated with hardness in water?
- ACorrosion
- BBlue Baby Syndrome
- CHigh Blood Pressure
- DScaling
67What is the problem with very soft water?
- AScaling
- BLeads to kidney disease
- CCorrosion
- DTHM formation
68Why is it harmful to backwash at a high velocity?
- AForms mudballs
- BFlushes some media into spent backwash water
- CIncreases build-up (headloss)
- DForms THMs
69What occurs on the right side of the breakpoint chlorination curve?
- AChlorine is destroyed by reducing compound
- BFormation of chloroganics
- CChlororganics partly destroyed
- DFree available residual chlorine begin to form
70How does Powder Activated Carbon (PAC) remove contaminants from the water?
- AAbsorption
- BDisinfection
- CAdsorption
- DFiltration
71Which entity is responsible for enforcing the drinking water standards?
- AState
- BCity
- CCounty
- DFederal EPA
72How is the rate of head loss affected by a more uniform filter media?
- AFaster
- BSlower
- CUnaffected
- DMore breakthroughs
73Which of the following is true about soluble iron and Manganese?
- ACarcinogens
- BReddish brown
- CBlack
- DColorless
74What is the reason for adding coagulants at the flash mixer?
- AStir flocs together
- BOxidize iron and manganese
- CNeutralize negative charge on colloids
- DPre-chlorination
75Why would a water purveyor switch from chlorine gas to sodium hypochlorite?
- AEliminate THMs
- BSafety
- CTo minimize liquid chemical storage at plant
- DTo eliminate the usage of free chlorine at the plant
76Which pathogen is smallest in size
- ABacteria
- BProtozoa
- CCyst
- DVirus
77Which of the following is not an example of a suspended solid?
- ASilt
- BDecaying plants
- CAnimal matter
- DSoluble calcium
78Which of the following is not a type of a coliform test?
- AMultiple Tube Fermentation method
- BMembrane Filter Method
- CDPD
- DColilert Method
79What is the definition of a public water system?
- APublicly or privately owned water system that has at least 15 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year
- BPublicly or privately owned water system that has at least 25 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year
- CPublicly or privately owned water system that has at least 35 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year
- DPublicly or privately owned water system that has at least 45 service connections, or regularly serves and average of at least 25 people daily at least 60 days per year
80When is Brilliant Green Bile used to test for coliform?
- AMembrane Filter Method
- BMultiple Tube Fermentation method
- CColisure Method
- DMF Method - Escherichia coli
81Which of the following is the correct order of treatment for a conventional water treatment plant?
- AIntake, Coagulation, Flocculation, Filtration, Sedimentation, Disinfection
- BIntake, Flocculation, Coagulation, Filtration, Sedimentation, Disinfection
- CIntake, Coagulation, Flocculation, Sedimentation, Filtration, Disinfection
- DIntake, Flocculation, Sedimentation, Coagulation, Filtration, Disinfection
82What might happen if insufficient amount of coagulants were injected into the flash mixer?
- AExcessive increase in floc size
- BScaling becomes a problem
- CWorsens DBP problem
- DSome colloids may repel each other
83Which of the following is a grab sample?
- ATime proportional
- BSample taken on a one time basis without consideration of flow or time
- CFlow proportional
- DA collection of numerous individual discrete samples taken at regular intervals over a period of time
84What happens over the course of a filter run time?
- AHeadloss decreases
- BHeadloss is unaffected
- CHeadloss increases
- DHeadless goes to zero
85When is direct filtration used instead of conventional water treatment?
- AWhen source water is low in turbidity, color, and coliform
- BWhen source water is low in iron and manganese
- CWhen source water is low in nitrates
- DWhen source water has an ideal pH and temperature
86Convert 1,210 gpm to ft3/sec
- A1.7 ft3/s
- B2.7 ft3/s
- C3.9 ft3/s
- D4.8 ft3/s
87If a tank with a diameter of 60 feet, and a height of 30 feet is filled at a rate of 1,303 gpm, then how long will it take to fill this tank? Assume the tank was empty.
- A4.0 hours
- B9.8 hours
- C3.5 hours
- D8.1 hours
88How many 150-lb chlorine gas cylinders will you need per day to dose the water supply at 1.6 mg/L if the demand for water in a 24-hour period is 11,166,264 gallons?
- A3 cylinders
- B2 cylinders
- C1 cylinder
- D4 cylinders
89If the discharge pipe at a pump station is located 32 feet below the City Hall, what must the pressure be in the discharge pipe so that the water reaches the City Hall at a pressure of 62 psi? Assume that pipe friction and head loss are negligible.
- A75.9 psi
- B53.4 psi
- C62.7 psi
- D59.2 psi
90If a well has a static water level of 62 feet and a pumping water level of 83 feet, then what is the specific capacity if the well yield is 1,000 gpm?
- A32 gpm/ft
- B47.6 gpm/ft
- C56.7 gpm/ft
- D65.1 gpm/ft
91IF a 25% copper sulfate solution is added to a reservoir with a volume of 400,000 cubic feet, and the intended dose is 0.4 mg/L, then what is the amount of copper sulfate solution required in lbs?
- A29.9 lbs.
- B45.2 lbs.
- C39.9 lbs.
- D67.8 lbs.
92A pump with an efficiency of 77% and a motor of 91% are used to lift water 52 feet at a rate of 500 gpm. If the electrical unit cost is $0.14 kWh, then what is the daily cost to operate the pump and motor? Assume the equipment runs 24 hours/day.
- A$19.21
- B$41.25
- C$32.25
- D$23.52
93If a rectangular basin that is 50 feet long and 30 feet wide has a water level of 2 feet at 11 a.m., and rises to a water level of 20 feet at 6 p.m., then what is the pumping rate?
- A580.9 gpm
- B480 gpm
- C621.7 gpm
- D348.1 gpm
94A steel tank with a diameter of 45 feet and a height of 25 feet is draining at a flow rate of 342 gpm. What is the pressure 18 inches from the bottom of the tank, 4.2 hours later? Assume that the tank is initially full.
- A17 psi
- B12 psi
- C7 psi
- D2.5 psi
95How many pounds of 25% copper sulfate solution do you need to make 145 pounds of 3% copper sulfate solution?
- A17.4 lbs
- B19.8 lbs
- C21.3 lbs
- D14.7 lbs
96If you are required to have a chlorine dose of 1.7 mg/L in a 3-million gallon steel tank, then how many gallons of a 12.5% sodium hypochlorite solution will need to be injected? Assume the specific weight of the chemical is 10lbs/gallon, and that the tank is 40% full. There is not chlorine in the water prior to dosage.
- A3.6 gallons
- B1.7 gallons
- C13.6 gallons
- D4.2 gallons
97If the surface dimensions of a sand filtration bed are 35 feet (length) and 30 feet (width), then what is the filtration rate if the flow is 2,525 gallons per minute?
- A1.9 GPM/sq. ft.
- B4.2 GPM/sq. ft.
- C3.5 GPM/sq. ft.
- D2.4 GPM/sq. ft.
98If the desired concentration of chlorine in a 2-million gallon welded steel tank is 2 mg/L, then how many pounds of 65% calcium hypochlorite tablet must be placed inside the tank?
- A59 lbs
- B51 lbs
- C69 lbs
- D40 lbs
99If the velocity of water in a 6-inch pipe is 4.5 ft/s, then what is the velocity of the water if the pipe transitions to a 8 -inch pipe?
- A2.5 ft/s
- B5 ft/s
- C1.9 ft/s
- D6.4 ft/s
100If 1.2 MGD of water flows through a rectangular sedimentation basin that is 55 feet long and 30 feet wide, then what is the overflow rate?
- A0.24 GPM/sq. ft.
- B0.51 GPM/sq. ft.
- C0.68 GPM/sq. ft.
- D041 GPM/sq. ft.
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- Water Treatment Operator Certification
- Author
- Joe Jorgensen
- Language
- English
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