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Water Distribution Certification 3

Water Distribution Certification 3
82問 • 2年前
  • ユーザ名非公開
    • 通報

    問題一覧

  • 1

    A connection between a potable water system and non-potable water system is called a:

    cross connection

  • 2

    what type of level indicator uses air in its operation

    bubbler tube

  • 3

    if there is an ongoing problem with an operator; how should the supervisor handle it?

    discuss the problem with the operator and document the problem in writing

  • 4

    what is the health risk associated with trihalomethanes

    cancer

  • 5

    if a water main breaks what should be the first action of the distribution operator?

    stop the leak by shutting down isolation valves

  • 6

    Distant locations should be monitored by what type of instrumentation

    Relay systems

  • 7

    Where are all service connections most likely to leak?

    curb stop connection

  • 8

    What is one method of increasing your wells productivity?

    Acidification

  • 9

    What type of storage tank is built in the way that resembles a home basement?

    Cast place concrete

  • 10

    The national primary drinking water regulations apply to contaminants that have an adverse effect on:

    Human health

  • 11

    What is the minimum flow velocity in Flushing a section of pipe?

    2.5 FPS

  • 12

    If Coliform bacteria is found in a water supply. What is likely the source?

    Fecal matter from warm, blooded animals

  • 13

    What is the difference between a weak acid and a strong acid?

    Amount of hydrogen ions released

  • 14

    chlorine demand is the difference between the chlorine _______ and the chlorine _______.

    dose and residual

  • 15

    Hey Dry barrel fire hydrant has

    One main valve, the barrel from Water main pressure

  • 16

    an entrant Going into a permit required confined space is required to wear

    Chest or body harness, and a retrieval line

  • 17

    What is the best way to prevent contaminating the Water main when installing a new service connection?

    wet tap with system pressureized

  • 18

    A concrete block that is placed around the pipe usually at a bend, or intersection to prevent movement is called a

    Thrust block

  • 19

    What type of meter is used to measure a wide range of flows?

    compound meter

  • 20

    When handling sodium hypochlorite, what type of protective gear should be worn?

    Chemical goggles

  • 21

    .

    Arch style

  • 22

    The secondary standard for iron is

    0.30 MGL

  • 23

    Laboratory records for turbidity analysis should be kept for ______ years

    Five

  • 24

    Who is responsible for public notification if there is a water quality problem

    The water system

  • 25

    Customers will notice if distribution water turbidity exceeds _____ NTU

    Five

  • 26

    What is the recommended maximum distance between isolation valves?

    800 feet

  • 27

    What is the minimum oxygen concentration for an environment to be considered safe?

    19.5%

  • 28

    Which type of curb box prevents misalignment

    Minneapolis style

  • 29

    Which gas is lighter than air odorless highly flammable, and is sometimes referred to a swamp gas

    Methane

  • 30

    The act passed by the US Congress in 1974 ensure safe, drinking water for consumers is called

    Safe, drinking water act

  • 31

    Which of the following pipe material is flexible cement, copper ,galvanized iron or steel

    Copper

  • 32

    A chemical field pump used to dispense a chlorine solution into a water system is called

    Hypochlorinator

  • 33

    What form provides hazard information?

    MSDS

  • 34

    What is the recommended dose when Using the tablet method to disinfect a water main?

    50 mg/l

  • 35

    Cave in protection is required for all trenching operations deeper than ______ ft

    5

  • 36

    Asbestos cement pipe contains which of the following

    Silica sand

  • 37

    How often should the atomosphere be monitored during a confined space entry

    Continuously

  • 38

    Why is it necessary to maintain system pressure above 20psi?

    Prevent contamination

  • 39

    What are two common metals used for Anodes?

    Zinc and magnesium

  • 40

    From the following list, which pump characteristics is shown on a pump curve?

    Efficiency

  • 41

    Before entering an enclosed tank to work, what paperwork should be completed?

    Confined space permit

  • 42

    How are sample locations for coliform sample selected

    locations that are representative of the entire system

  • 43

    What is the maximum contaminant level goal for chloride?

    250 mg/l

  • 44

    A water sample that is nearly identical to the content and consistency of a larger body of water is called

    Representative sample

  • 45

    What is the purpose of sodium thiosulfate in coliform sample bottles?

    Remove chlorine residual

  • 46

    Why is it necessary to maintain a chlorine residual and the distribution system?

    Contamination can occur at any time

  • 47

    A wet barrel fire hydrant has

    A separate valve for each nozzle

  • 48

    If a motor is started infrequently but needs to be brought up to speed quickly when it is started, what is the best type to use for the application

    Capacitor start

  • 49

    What happens to the accuracy of a positive displacement meter over time?

    It reads low

  • 50

    What is the main purpose of distribution storage tanks?

    Meat, peak water demands

  • 51

    Residential distribution system pressure should be limited to prevent the premature failure of

    Water heaters and other water appliances

  • 52

    What is the maximum hold time for a coliform sample? If you are sending it to an outside lab

    30 hours

  • 53

    petroleum fuels, and other organic compounds may permeate which type of pipe

    Plastic

  • 54

    what is the determining factor when designing the size and capacity of distribution system tanks pipes, and pumps

    Fire protection needs

  • 55

    after installing and pressure testing a new water main, what is the next thing I should be done

    Disinfect it with a 25 mg/L to 50 mg/L chlorine solution for 24 hours

  • 56

    Why are booster pumps used in a distribution system?

    Raise pressure to overcome an elevation difference

  • 57

    The chlorine concentration in a distribution system , once the chlorine demand has been met is called

    Chlorine residual

  • 58

    What type of ductile iron pipe joint is the least expensive and goes together fast

    Push on joint

  • 59

    what is the minimum contact time when? Using the chlorine tablet method for disinfection of a new main

    24 hours

  • 60

    A measurement of the hydrogen ion concentration is called

    PH

  • 61

    In theory , what is the maximum suction lift of a centrifugal pump at sea level?

    34 feet

  • 62

    which of the following will increase the corrosion rate when present in water ?

    Dissolved oxygen

  • 63

    what is the C value of a pipe a measure of?

    The smoothness of a pipes interior wall

  • 64

    what is the difference between a primary and secondary standard?

    primary standards are for substances believed to pose a health risk while secondary standards do not

  • 65

    Which chemicals require an MSDS?

    All chemicals used in the workplace

  • 66

    what is the main reason? Wells are sealed or grouted?

    prevent surface water contamination

  • 67

    Which type of level sensor is connected to a pressure transducer with a tube

    Diaphragm element

  • 68

    What is the function of an air relief valve on a well?

    to vent air in the well column of an off-line well

  • 69

    if your distribution system has an active flushing program, when is the best time to perform the flushing

    During night or times of least traffic

  • 70

    What happens to the disinfection effectiveness of Chlorine as water temperature decreases?

    Less effective

  • 71

    when is the best time to conduct a leak survey?

    When noise levels are lowest

  • 72

    If the recharge area of a confined aquifer is elevated, what will happen to the water in The aquifer

    It will be pressurized

  • 73

    When installing shoring in a trench, how much space should be between each section

    No space

  • 74

    What type of meter is most commonly used for residential water metering

    Positive displacement

  • 75

    What is the name of the document that lists a distribution systems, coliform sample schedule and sample sites?

    Sample siting plan

  • 76

    A cleaning plug that has silicone carbide, wire brushes, or hardened steel brushes is called

    scraping pig

  • 77

    What type of reservoir is constructed like a swimming pool?

    Hydrauliclly applied concrete

  • 78

    The recommended interval between testing a 5/8 inch meter is _____ years

    10

  • 79

    The depression of the water surface around the well caused by pumping is called the

    Cone of depression

  • 80

    Which sample requires the chlorine residual to be removed prior to analysis

    Coliform bacteria

  • 81

    which gas has a rotten egg odor

    Hydrogen sulfide

  • 82

    what is the recommended maximum head loss for positive displacements meters smaller than two inches?

    15 psi

    • 問題一覧

  • 1

    A connection between a potable water system and non-potable water system is called a:

    cross connection

  • 2

    what type of level indicator uses air in its operation

    bubbler tube

  • 3

    if there is an ongoing problem with an operator; how should the supervisor handle it?

    discuss the problem with the operator and document the problem in writing

  • 4

    what is the health risk associated with trihalomethanes

    cancer

  • 5

    if a water main breaks what should be the first action of the distribution operator?

    stop the leak by shutting down isolation valves

  • 6

    Distant locations should be monitored by what type of instrumentation

    Relay systems

  • 7

    Where are all service connections most likely to leak?

    curb stop connection

  • 8

    What is one method of increasing your wells productivity?

    Acidification

  • 9

    What type of storage tank is built in the way that resembles a home basement?

    Cast place concrete

  • 10

    The national primary drinking water regulations apply to contaminants that have an adverse effect on:

    Human health

  • 11

    What is the minimum flow velocity in Flushing a section of pipe?

    2.5 FPS

  • 12

    If Coliform bacteria is found in a water supply. What is likely the source?

    Fecal matter from warm, blooded animals

  • 13

    What is the difference between a weak acid and a strong acid?

    Amount of hydrogen ions released

  • 14

    chlorine demand is the difference between the chlorine _______ and the chlorine _______.

    dose and residual

  • 15

    Hey Dry barrel fire hydrant has

    One main valve, the barrel from Water main pressure

  • 16

    an entrant Going into a permit required confined space is required to wear

    Chest or body harness, and a retrieval line

  • 17

    What is the best way to prevent contaminating the Water main when installing a new service connection?

    wet tap with system pressureized

  • 18

    A concrete block that is placed around the pipe usually at a bend, or intersection to prevent movement is called a

    Thrust block

  • 19

    What type of meter is used to measure a wide range of flows?

    compound meter

  • 20

    When handling sodium hypochlorite, what type of protective gear should be worn?

    Chemical goggles

  • 21

    .

    Arch style

  • 22

    The secondary standard for iron is

    0.30 MGL

  • 23

    Laboratory records for turbidity analysis should be kept for ______ years

    Five

  • 24

    Who is responsible for public notification if there is a water quality problem

    The water system

  • 25

    Customers will notice if distribution water turbidity exceeds _____ NTU

    Five

  • 26

    What is the recommended maximum distance between isolation valves?

    800 feet

  • 27

    What is the minimum oxygen concentration for an environment to be considered safe?

    19.5%

  • 28

    Which type of curb box prevents misalignment

    Minneapolis style

  • 29

    Which gas is lighter than air odorless highly flammable, and is sometimes referred to a swamp gas

    Methane

  • 30

    The act passed by the US Congress in 1974 ensure safe, drinking water for consumers is called

    Safe, drinking water act

  • 31

    Which of the following pipe material is flexible cement, copper ,galvanized iron or steel

    Copper

  • 32

    A chemical field pump used to dispense a chlorine solution into a water system is called

    Hypochlorinator

  • 33

    What form provides hazard information?

    MSDS

  • 34

    What is the recommended dose when Using the tablet method to disinfect a water main?

    50 mg/l

  • 35

    Cave in protection is required for all trenching operations deeper than ______ ft

    5

  • 36

    Asbestos cement pipe contains which of the following

    Silica sand

  • 37

    How often should the atomosphere be monitored during a confined space entry

    Continuously

  • 38

    Why is it necessary to maintain system pressure above 20psi?

    Prevent contamination

  • 39

    What are two common metals used for Anodes?

    Zinc and magnesium

  • 40

    From the following list, which pump characteristics is shown on a pump curve?

    Efficiency

  • 41

    Before entering an enclosed tank to work, what paperwork should be completed?

    Confined space permit

  • 42

    How are sample locations for coliform sample selected

    locations that are representative of the entire system

  • 43

    What is the maximum contaminant level goal for chloride?

    250 mg/l

  • 44

    A water sample that is nearly identical to the content and consistency of a larger body of water is called

    Representative sample

  • 45

    What is the purpose of sodium thiosulfate in coliform sample bottles?

    Remove chlorine residual

  • 46

    Why is it necessary to maintain a chlorine residual and the distribution system?

    Contamination can occur at any time

  • 47

    A wet barrel fire hydrant has

    A separate valve for each nozzle

  • 48

    If a motor is started infrequently but needs to be brought up to speed quickly when it is started, what is the best type to use for the application

    Capacitor start

  • 49

    What happens to the accuracy of a positive displacement meter over time?

    It reads low

  • 50

    What is the main purpose of distribution storage tanks?

    Meat, peak water demands

  • 51

    Residential distribution system pressure should be limited to prevent the premature failure of

    Water heaters and other water appliances

  • 52

    What is the maximum hold time for a coliform sample? If you are sending it to an outside lab

    30 hours

  • 53

    petroleum fuels, and other organic compounds may permeate which type of pipe

    Plastic

  • 54

    what is the determining factor when designing the size and capacity of distribution system tanks pipes, and pumps

    Fire protection needs

  • 55

    after installing and pressure testing a new water main, what is the next thing I should be done

    Disinfect it with a 25 mg/L to 50 mg/L chlorine solution for 24 hours

  • 56

    Why are booster pumps used in a distribution system?

    Raise pressure to overcome an elevation difference

  • 57

    The chlorine concentration in a distribution system , once the chlorine demand has been met is called

    Chlorine residual

  • 58

    What type of ductile iron pipe joint is the least expensive and goes together fast

    Push on joint

  • 59

    what is the minimum contact time when? Using the chlorine tablet method for disinfection of a new main

    24 hours

  • 60

    A measurement of the hydrogen ion concentration is called

    PH

  • 61

    In theory , what is the maximum suction lift of a centrifugal pump at sea level?

    34 feet

  • 62

    which of the following will increase the corrosion rate when present in water ?

    Dissolved oxygen

  • 63

    what is the C value of a pipe a measure of?

    The smoothness of a pipes interior wall

  • 64

    what is the difference between a primary and secondary standard?

    primary standards are for substances believed to pose a health risk while secondary standards do not

  • 65

    Which chemicals require an MSDS?

    All chemicals used in the workplace

  • 66

    what is the main reason? Wells are sealed or grouted?

    prevent surface water contamination

  • 67

    Which type of level sensor is connected to a pressure transducer with a tube

    Diaphragm element

  • 68

    What is the function of an air relief valve on a well?

    to vent air in the well column of an off-line well

  • 69

    if your distribution system has an active flushing program, when is the best time to perform the flushing

    During night or times of least traffic

  • 70

    What happens to the disinfection effectiveness of Chlorine as water temperature decreases?

    Less effective

  • 71

    when is the best time to conduct a leak survey?

    When noise levels are lowest

  • 72

    If the recharge area of a confined aquifer is elevated, what will happen to the water in The aquifer

    It will be pressurized

  • 73

    When installing shoring in a trench, how much space should be between each section

    No space

  • 74

    What type of meter is most commonly used for residential water metering

    Positive displacement

  • 75

    What is the name of the document that lists a distribution systems, coliform sample schedule and sample sites?

    Sample siting plan

  • 76

    A cleaning plug that has silicone carbide, wire brushes, or hardened steel brushes is called

    scraping pig

  • 77

    What type of reservoir is constructed like a swimming pool?

    Hydrauliclly applied concrete

  • 78

    The recommended interval between testing a 5/8 inch meter is _____ years

    10

  • 79

    The depression of the water surface around the well caused by pumping is called the

    Cone of depression

  • 80

    Which sample requires the chlorine residual to be removed prior to analysis

    Coliform bacteria

  • 81

    which gas has a rotten egg odor

    Hydrogen sulfide

  • 82

    what is the recommended maximum head loss for positive displacements meters smaller than two inches?

    15 psi