Test
Distribution 2 Quiz 3
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Preguntas del test (100)
1Which two acids are formed when chlorine gas is mixed with water?
- ACitric acid and hydrochloric acid
- BHypochlorous acid and dichloramine
- CHypochlorous acid and monochloramine
- DHypochlorous acid and hydrochloric acid
2Which of the following is a disinfection by-product (DBP)?
- AMethane
- BChlorine
- CTrihalomethane
- DChloramine
3_____________ is a DBP precursor
- ANatural organic matter
- BArsenic
- CNitrate
- DLead
4Which of the following is a velocity meter?
- ANutating disk
- BPropeller
- CPiston
- DCompound
5What is true about a pipe with a C value of 100?
- AVery smooth interior
- BVery strong pipe
- CVery weak pipe
- DVery rough interior
6Which of the following is a map that provides an overall view of the entire distribution system, and includes treatment plants, wells, reservoirs, mains, hydrants, and valves?
- ACombination map
- BConditional map
- CComprehensive map
- DProcess schematic
7Which terminology refers to the bottom of a pipe interior?
- AInvert
- BCrown
- CLateral
- DSubsurface
8Which of the following best describes transpiration?
- AThe process by which atmospheric moisture falls onto land
- BThe process by which water vapor is released to the atmosphere by living plants
- CThe conversion of vapor to liquid
- DThe conversion of liquid to solid
9Choose the best answer regarding coliform sampling.
- ASamples are taken based on the number of complaints received during the prior month
- BAll samples are taken at the largest tank sites
- CSamples must be taken in accordance with an approved sampling plan
- DSamples are taken based on the total length of water main
10What is the purpose of a venturi?
- AMeasure pH
- BMeasure amount of tuberculation in a pipe
- CMeasure the water depth in a tank
- DMeasure flow rate
11Which terminology is used to describe the upper surface of an unconfined aquifer?
- ABorehole
- BDrawdown
- CWater table
- DZone of influence
12What must be worn before entering a room with a chlorine gas leak?
- ASelf-contained breathing apparatus (SCBA)
- BLanyard
- CHarness
- DCable
13How are disinfection by-products formed?
- AChlorine reacts with arsenic
- BChlorine reacts with nitrate
- CChlorine reacts with iron
- DChlorine reacts with natural organic matter
14What is true about positive displacement pumps?
- AIt is commonly used to pump groundwater from a well
- BNever operate it with the discharge valve closed because it could rupture the discharge pipe
- CFlow rate varies with change in pressure
- DAn impeller is used to move water
15Which of the following is a strong base?
- ApH = 6
- BpH = 7
- CpH = 14
- DpH = 1
16Which of the following is a non-transient, non-community water system?
- ASchool
- BPark
- CMotel
- DRestaurant
17How many feet above the top of a trench must a ladder extend?
- AAt least 5 feet above the top of the trench
- BAt least 4 feet above the top of the trench
- CAt least 3.5 feet above the top of the trench
- DAt least 3 feet above the top of the trench
18What is the purpose of a pitot gauge?
- ATest water quality
- BDetermine flow rate
- CTest corrosivity of water
- DCheck strength of pipe
19What is true about a fusible plug on a chlorine cylinder?
- AIt is used to remove chlorine from a cylinder
- BIt is where chlorine is refilled by an operator
- CIt is a safety device that must never be removed
- DIt is primarily used to lift the chlorine cylinder
20What is methemogrlobinemia
- AToxic gas
- BDisease caused by lead
- CAilment caused by coliform
- DBlue Baby Syndrome
21Which law set the national drinking water standards?
- ASafe Drinking Water Act
- BFederal Water Act
- CNational Potable Water Act
- DFederal Drinking Water Rule
22Which of the following is true about coliform sampling?
- AMonthly sampling requirements are based on the total length of service laterals in the distribution system
- BRoutine coliform monitoring frequency for a community water system is based on the size of the population served.
- CMonthly sampling requirements are based on the peak demand
- DMonthly sampling requirements are based on the total length of water main in the distribution system
23__________________ is a type of centrifugal pump.
- APlunger pump
- BPiston pump
- CVertical tubrine pump
- DDiaphragm pump
24Which of the following is true regarding Tier 2 of the Public Notification Rule?
- ACustomers must be notified as soon as possible, but wtihin 30 days if a contaminant that doesn't pose an immediate health risk exceeds the MCL
- BCustomers must be notified within 24 hours if there is potential for human health to be immediately impacted
- CCustomers must be notified within a year if a required water sample was not taken
- DCustomers must be notified within 48 hours if there is potential for human health to be immediately impacted
25What is flexural strength of a pipe?
- AForce required to pull a pipe to the point of failure
- BCompressive force
- CAbility of a pipe to resist tensile force
- DAbility of a pipe to bend without breaking
26___________________ are types of impeller for a centrifugal pump.
- ASemi-open and closed
- BPositive and negative
- CMechanical and packing
- DCation and anion
27What is the maximum practical suction lift for a centrifugal pump?
- A50 feet
- BBetween 1 and 5 feet
- CBetween 15 and 25 feet
- D75 feet
28What is a Consumer Confidence Report?
- AAn annual report that summarizes the finances of the water purveyor
- BAn annual report that projects the water demand for the next five years
- CAn annual water quality report to customers regarding their drinking water
- DA bi-annual report that evaluates the reliability of the water system in case of a catastrophe
29What is back-siphonage?
- ABackflow from a house with higher water pressure than the adjacent water main
- BReverse flow from a factory pump to the water distribution system
- CUnprotected connection between a non-potable water source and teh water distribution system
- DBackflow due to negative pressure in the water system
30What is used to test for leakages in pipes?
- APitot gauge
- BPressure testing
- CAnode
- DSwab
31What is a grout seal in a well?
- AA deal used to minimize water leakage from a well pump
- BThe gasket used to connect the well casings to the pump
- CConcrete foundation for the well pump
- DGrout placed outside of the well casing to prevent contamination of the aquifer
32What will cause a well pump to backspin after pumping has stopped?
- ACone of depression
- BCavitation
- CAn open check valve
- DA damaged air release valve
33____________________ is commonly implemented to resolve taste and odor issues in the water distribution system.
- AFlushing
- BAdding polymer
- CAdding copper sulfate
- DInjecting sodium thiosulfate
34What would trigger a Level 1 Assessment for a distribution system that collects at least 40 total coliform samples per month?
- AMore than 10% of samples collected are total coliform positive
- BMore than 5% of samples are total coliform positive
- CMore than 7% of samples are total coliform positive
- DMore than 12% of samples collected are total coliform postive
35What is residual drawdown?
- AThe difference between the static water level and pumping water level
- BThe lowering of the water table by an adjacent well pump
- CIf the water level in a well does not return to its original static water level after pumping has stopped, the vertical distance it falls short is the residual drawdown
- DThe difference between the ground surface and the pumping water level
36What problem occurs when the water has low pH?
- AScaling
- BHigh alkalinity
- CStratification
- DCorrosion
37What is recover time for a well?
- AThe run time of a well pump
- BThe time it takes to cool a well pump
- CThe time required for the water level to return to the static water level after pumping has stopped
- DThe time it takes to pump the maximum flow rate after the pump has started
38Which disinfectant is most widely used for a public water system?
- AChloramine
- BChlorine
- CUV
- DOzone
39What is the purpose of a coupon in a water distribution system?
- ARemove tuberculation
- BCheck the corrosiveness of water
- CRelieve excess pressure
- DUsed to make a hot tap
40What is a zone of influence for a well?
- AThe area that covers the limits of cone of depression
- BThe difference between the static water level and the pumping water level
- CThe water level in the well when the pump is operating
- DThe water level in the well when the pump has been turned off
41What is one of the main benefits of repairing a water main while it is pressurized?
- ASafety of construction employees
- BHelps remove tuberculation
- CAllows crew to check the interior condition of the pipe
- DMinimizes the chances of contaminating the water supply
42What is the recommended minimum horizontal separation between a new water main and an existing gravity sewer?
- A1 foot
- B5 feet
- C10 feet
- D20 feet
43What must be done if a repeat sample tests positive for total coliform bacteria?
- ATest sample for Giardia
- BTest sample for E. coli
- CTest sample for Cryptosporidium
- DTest sample for viruses
44What is dichloramine?
- AFree residual chlorine
- BA chemical used to dechlorinate water
- CCombined residual chlorine
- DHypochlorous acid
45What is used to check for fecal contamination in a water distribution system?
- APresence / absence test for coliform bacteria
- BCryptosporidium test
- CVirus analysis
- DTest for Gieardia
46What is an appropriative water right?
- AA water right that is aquired with title to land, bordering surface water
- BA water right that is acquired through adverse possession of someone else's water right
- CA water right for a homeownder who purchased property adjacent to a river
- DA water right that is acquired for the beneficial use of water by following a specific legal procedure
47What is holding time?
- AThe time it takes to prime a pump
- BElapsed time between sample collection and analysis
- CThe time it takes chlorine to react with ammonia
- DThe time it takes to flush a hydrant
48Which water source is most protected from pathogens?
- ARiver
- BLake
- CDeep well
- DShallow aquider
49What is a radial well?
- AArtesian well
- BShallow well
- CA pilot well
- DA caisson with horizontally drilled wells
50What is the purpose of packing in a pump?
- AMinimize leakage, while allowing a slight leak
- BCompletely stop leakage
- CImpart velocity to the water
- DProtect shaft from excessive wear-and-tear
51What is the purpose of seal water in a pump?
- AIncrease pump pressure
- BCool and lubricate the packings
- CCool the motor
- DClean the impeller
52What is the purpose of a mechanical seal?
- ACreate a water-tight bell and spigot joint for a pipe
- BPrevent surface water from contaminating the aquifer
- CConnect a new water main to an existing pipe
- DPrevent leakage from a pump
53Which valve is commonly used in control valves?
- AGate valve
- BGlobe valve
- CButterfly valve
- DAir release valve
54Which terminology means "a sudden change in water pressure, caused by quickly opening or closing a valve?"
- ACorrosion
- BTuberculation
- CWater Hammer
- DCavitation
55What type of sample should be used to test for bacteria?
- AGrab sample
- BComposite sample
- CComprehensive sample
- DMixed sample
56_______________ is a condition in which dissolved oxygen is present in water?
- AAnaerobic
- BAerobic
- CThermocline
- DHydrophobic
57Which of the following is a secondary containment?
- AAresenic
- BNitrate
- CManganese
- DLead
58What is true about a hydropneumatic tank?
- AAlways sized for fire flow
- BOften used at a water treatment plant to store treated water
- CTypically found in large water systems to provide water via gravity flow
- DProvides inadequate fire protection
59What is the purpose of a thrust block in a water distribution system?
- AStop the flow of water
- BRestrain and prevent movement of the piping system
- CPush air bubbles out of the water main
- DA pump station that adds significant head to the water
60What is the chlorine residual if the chlorine does is 3.3 mg/L and the chlorine demand is 1.2 mg/l?
- A4.5 mg/L
- B1.2 mg/L
- C2.2 mg/L
- D2.1 mg/L
61Which of the following is a primary contaminant?
- AIron
- BManganese
- CNitrate
- DChloride
62How often should large water meters be tested?
- AEvery 1-4 years
- BEvery 5-7 years
- CBi-Monthly
- DMonthly
63What is the purpose of using a jumper cable when removing a water meter?
- ACorrosion control
- BMaintain proper alignment of the service lateral
- CPrevent settling of the meter box
- DAvoid electrical shock
64How does water temperature affect the effectiveness of chlorine?
- AChlorine becomes less effective as the water temperature becomes warmer
- BThe higher the temperature, the more rapid the rate of disinfection
- CWater temperature does not impact the effectiveness of chlorine
- DChlorine effectiveness significantly fluctuates as the water temperature increases
65What is per capita water usage?
- AThe total amount of water used within a water distribution system each month
- BThe total amount of water used by a water district each year
- CAverage day demand divided by the total number of people served
- DThe total amount of water used by a family in one year
66Which chemical is commonly used as a liquid disinfectant in the water industry?
- ASodium hypochlorite
- BSodium chloride
- CSodium hydroxide
- DCalcium hypochlorite
67What is a volatile substance?
- AInorganic matter
- BOrganic matter
- CAll suspended solids
- DAll dissolved solids
68What could cause water to appear black?
- AArsenic
- BNitrate
- CManganese
- DIron
69What is the purpose of the drain hole in a dry barrel fire hydrant?
- ARelieve excess pressure
- BDewater water main prior to repair
- CA drain hole is not commonly found on a dry barrel hydrant
- DRemove water from the barrel of the hydrant
70What is a composite sample?
- AA single sample of water collected at a particular time and place
- BA sample to test for pH
- CA collection of individual samples obtained at regular intervals
- DA sample to test for coliform bacteria
71What is the most common type of water meter for residential services?
- ANutating disk water meter
- BPropeller water meter
- CElectromagnetic meter
- DVenturi meter
72What is the proper way to close a hydrant valve?
- AQuickly close the valve
- BSlowly close the valve
- CClose the largest valve near the hydrant
- DClose the smallest valve on the adjacent water main
73What problem would most likely occur if a pump motor is over greased?
- ALantern ring is damaged
- BPackings wear out quickly
- CMechanical seal becomes loose
- DOverheating
74What is total dynamic head?
- AFriction loss
- BThe difference in water level between the discharge side and suction side of the pump
- CTotal static head + head loss
- DThe water pressure on the discharge side of the pump
75What is total static head?
- AThe head on the suction side of the pump
- BThe head on the discharge side of the pump
- CFriction loss when the pump is running
- DThe vertical distance between the free water surface on the discharge side of the pump and the suction side of the pump
76Which source water typically contains the most iron and manganese?
- AGroundwater
- BLake
- CRiver
- DStream
77What is one of the roles of the attendant during confined space entry?
- AAuthorize entry
- BAssess the conditions inside and outside the confined space to determine if it is safe for the entrant to remain inside, and orders the entrant to evacuate the confined space as necessary
- CCancel the entry permit, as necessary
- DVerify that all testes specified by the permit have been condcuted and that all procedures and equipment specified by the permit are in place before endorsing the permit
78What is the source of E. coli?
- AIntestines of warm-blooded organisms
- BReptiles
- CFish
- DVegetation
79What will happen if the hydrochloric acid concentration in the water increases?
- ApH will increase
- BpH will be unaffected
- CpH will significantly fluctuate
- DpH will decrease
80What is chlorine demand?
- AThe amount of chlorine remaining after contact time
- BTotal chlorine dosage
- CThe difference between the total chlorine added to the water and the chlorine residual
- DThe amount of chlorine injected into water
81What is used to measure the flow rate of chlorine gas from a cylinder?
- AEjector
- BYoke clamp
- CFusible plug
- DRotameter
82What does pH represent?
- AHypochlorite concentration
- BMeasure of hydrogen ion activity
- CHydrogen peroxide concentration
- DPhosphorus and hydrogen concentration
83What is typically used to measure flow rate in an open channel?
- ANutating disk
- BPropeller
- CWeir
- DPositive displacement meter
84What causes turbidity?
- ASuspended solids
- BCalcium
- CSodium
- DMagnesium
85Why would you not use Lead pipe?
- AProblem with connecting with pipes of different metals
- Btuberculation issues
- CTurbulence issues
- DCorrosion risks
86Where is the shut off valve for a dry barrel hydrant?
- ATop of the hydrant
- BOn the lateral
- Cwithin 2 feet of the hydrant
- DBottom of the hydrant with 2 drain holes
87How many pounds of pressure on a 9" closed gate valve with a registered 60 psi?
- A540 pounds
- B2543 pounds
- C3340 pounds
- D4860 pounds
88Who determines if a trench needs shoring?
- ACompetent Person
- BEmployee in the trench
- CWater Engineer
- DCity Official
89A green paint marking indicates what when excavating a 6 foot trench within 20 feet of a ladder?
- ASafe to dig here
- BSewer lines near here
- C5 feet from the safety of a ladder insertion point
- DTreated water line near here
90Why would you open a dry barrel hydrant completely
- ATo provide maximum flow
- BTo flush the operating nut
- CTo provide access to the drain holes
- DTo test pH at the next hydrant
91How would you check the residual pressure of a dry barrel fire hydrant?
- AOpen the hydrant adjacent in the service line
- BConnect a potentiomenter
- CDPD tester
- DStep down test
92How do you check the level of a chlorine gas cylinder?
- AWeight it
- BWith an injector
- CWiggle the cylinder
- DWith a pressure guage
93What strength is chlorine gas?
- A12.5%
- B25%
- C65%
- D100%
94White paint markings indicate what?
- AWater line beneath ground
- BTelecommunications line beneath ground
- CGas line beneath ground
- DExcavation area
95What is the residual pressure in reference to measuring a fire hydrant residual pressure?
- APressure reading before water flows.
- BMeasurement obtained by a pitot guage on the top of the hydrant
- CPressure reading while water is flowing (from an outlet other than the flow outlet.)
- DPressure remaining after all valves have been closed for 60 seconds or more
96How long do you wait to flush the line after using the tablet method for a new line?
- A1 hour
- B6 hours
- C24 hours
- D48 hours
97Which of the following is best for disinfecting short sections of pipe?
- ASlug Method
- BTablet Method
- CPigging Method
- DFill Method
98What is galvanic corrosion?
- AGalvanized pipe connected to pvc pipe
- BCopper connected to lead pipe
- CPvc pipe connected to a pump
- DGalvanized pipe with high pH water
99Which of the following are disinfection types used in water distribution systems
- ACalcium Hypychlorite
- BSodium Hypochlorite
- CSodium Thiosulfate
- DChloramine
100Which are used to dechlorinate water?
- ASodium thiosulfate
- Bcalcium aerobic
- Cascorbic acid
- Dsulfur dioxide
Información
- Descripción
- Water distribution 2 practice test
- Autor
- Joe Jorgensen
- Idioma
- English
- Visitas
- 77
- Etiquetas
- Valoración
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