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Distribution 2 Quiz 3

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Water distribution 2 practice test
Joe Jorgensen
Quiz by Joe Jorgensen, updated more than 1 year ago
Joe Jorgensen
Created by Joe Jorgensen over 6 years ago
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Resource summary

Question 1

Question
Which two acids are formed when chlorine gas is mixed with water?
Answer
  • Citric acid and hydrochloric acid
  • Hypochlorous acid and dichloramine
  • Hypochlorous acid and monochloramine
  • Hypochlorous acid and hydrochloric acid

Question 2

Question
Which of the following is a disinfection by-product (DBP)?
Answer
  • Methane
  • Chlorine
  • Trihalomethane
  • Chloramine

Question 3

Question
_____________ is a DBP precursor
Answer
  • Natural organic matter
  • Arsenic
  • Nitrate
  • Lead

Question 4

Question
Which of the following is a velocity meter?
Answer
  • Nutating disk
  • Propeller
  • Piston
  • Compound

Question 5

Question
What is true about a pipe with a C value of 100?
Answer
  • Very smooth interior
  • Very strong pipe
  • Very weak pipe
  • Very rough interior

Question 6

Question
Which 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?
Answer
  • Combination map
  • Conditional map
  • Comprehensive map
  • Process schematic

Question 7

Question
Which terminology refers to the bottom of a pipe interior?
Answer
  • Invert
  • Crown
  • Lateral
  • Subsurface

Question 8

Question
Which of the following best describes transpiration?
Answer
  • The process by which atmospheric moisture falls onto land
  • The process by which water vapor is released to the atmosphere by living plants
  • The conversion of vapor to liquid
  • The conversion of liquid to solid

Question 9

Question
Choose the best answer regarding coliform sampling.
Answer
  • Samples are taken based on the number of complaints received during the prior month
  • All samples are taken at the largest tank sites
  • Samples must be taken in accordance with an approved sampling plan
  • Samples are taken based on the total length of water main

Question 10

Question
What is the purpose of a venturi?
Answer
  • Measure pH
  • Measure amount of tuberculation in a pipe
  • Measure the water depth in a tank
  • Measure flow rate

Question 11

Question
Which terminology is used to describe the upper surface of an unconfined aquifer?
Answer
  • Borehole
  • Drawdown
  • Water table
  • Zone of influence

Question 12

Question
What must be worn before entering a room with a chlorine gas leak?
Answer
  • Self-contained breathing apparatus (SCBA)
  • Lanyard
  • Harness
  • Cable

Question 13

Question
How are disinfection by-products formed?
Answer
  • Chlorine reacts with arsenic
  • Chlorine reacts with nitrate
  • Chlorine reacts with iron
  • Chlorine reacts with natural organic matter

Question 14

Question
What is true about positive displacement pumps?
Answer
  • It is commonly used to pump groundwater from a well
  • Never operate it with the discharge valve closed because it could rupture the discharge pipe
  • Flow rate varies with change in pressure
  • An impeller is used to move water

Question 15

Question
Which of the following is a strong base?
Answer
  • pH = 6
  • pH = 7
  • pH = 14
  • pH = 1

Question 16

Question
Which of the following is a non-transient, non-community water system?
Answer
  • School
  • Park
  • Motel
  • Restaurant

Question 17

Question
How many feet above the top of a trench must a ladder extend?
Answer
  • At least 5 feet above the top of the trench
  • At least 4 feet above the top of the trench
  • At least 3.5 feet above the top of the trench
  • At least 3 feet above the top of the trench

Question 18

Question
What is the purpose of a pitot gauge?
Answer
  • Test water quality
  • Determine flow rate
  • Test corrosivity of water
  • Check strength of pipe

Question 19

Question
What is true about a fusible plug on a chlorine cylinder?
Answer
  • It is used to remove chlorine from a cylinder
  • It is where chlorine is refilled by an operator
  • It is a safety device that must never be removed
  • It is primarily used to lift the chlorine cylinder

Question 20

Question
What is methemogrlobinemia
Answer
  • Toxic gas
  • Disease caused by lead
  • Ailment caused by coliform
  • Blue Baby Syndrome

Question 21

Question
Which law set the national drinking water standards?
Answer
  • Safe Drinking Water Act
  • Federal Water Act
  • National Potable Water Act
  • Federal Drinking Water Rule

Question 22

Question
Which of the following is true about coliform sampling?
Answer
  • Monthly sampling requirements are based on the total length of service laterals in the distribution system
  • Routine coliform monitoring frequency for a community water system is based on the size of the population served.
  • Monthly sampling requirements are based on the peak demand
  • Monthly sampling requirements are based on the total length of water main in the distribution system

Question 23

Question
__________________ is a type of centrifugal pump.
Answer
  • Plunger pump
  • Piston pump
  • Vertical tubrine pump
  • Diaphragm pump

Question 24

Question
Which of the following is true regarding Tier 2 of the Public Notification Rule?
Answer
  • Customers 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
  • Customers must be notified within 24 hours if there is potential for human health to be immediately impacted
  • Customers must be notified within a year if a required water sample was not taken
  • Customers must be notified within 48 hours if there is potential for human health to be immediately impacted

Question 25

Question
What is flexural strength of a pipe?
Answer
  • Force required to pull a pipe to the point of failure
  • Compressive force
  • Ability of a pipe to resist tensile force
  • Ability of a pipe to bend without breaking

Question 26

Question
___________________ are types of impeller for a centrifugal pump.
Answer
  • Semi-open and closed
  • Positive and negative
  • Mechanical and packing
  • Cation and anion

Question 27

Question
What is the maximum practical suction lift for a centrifugal pump?
Answer
  • 50 feet
  • Between 1 and 5 feet
  • Between 15 and 25 feet
  • 75 feet

Question 28

Question
What is a Consumer Confidence Report?
Answer
  • An annual report that summarizes the finances of the water purveyor
  • An annual report that projects the water demand for the next five years
  • An annual water quality report to customers regarding their drinking water
  • A bi-annual report that evaluates the reliability of the water system in case of a catastrophe

Question 29

Question
What is back-siphonage?
Answer
  • Backflow from a house with higher water pressure than the adjacent water main
  • Reverse flow from a factory pump to the water distribution system
  • Unprotected connection between a non-potable water source and teh water distribution system
  • Backflow due to negative pressure in the water system

Question 30

Question
What is used to test for leakages in pipes?
Answer
  • Pitot gauge
  • Pressure testing
  • Anode
  • Swab

Question 31

Question
What is a grout seal in a well?
Answer
  • A deal used to minimize water leakage from a well pump
  • The gasket used to connect the well casings to the pump
  • Concrete foundation for the well pump
  • Grout placed outside of the well casing to prevent contamination of the aquifer

Question 32

Question
What will cause a well pump to backspin after pumping has stopped?
Answer
  • Cone of depression
  • Cavitation
  • An open check valve
  • A damaged air release valve

Question 33

Question
____________________ is commonly implemented to resolve taste and odor issues in the water distribution system.
Answer
  • Flushing
  • Adding polymer
  • Adding copper sulfate
  • Injecting sodium thiosulfate

Question 34

Question
What would trigger a Level 1 Assessment for a distribution system that collects at least 40 total coliform samples per month?
Answer
  • More than 10% of samples collected are total coliform positive
  • More than 5% of samples are total coliform positive
  • More than 7% of samples are total coliform positive
  • More than 12% of samples collected are total coliform postive

Question 35

Question
What is residual drawdown?
Answer
  • The difference between the static water level and pumping water level
  • The lowering of the water table by an adjacent well pump
  • If 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
  • The difference between the ground surface and the pumping water level

Question 36

Question
What problem occurs when the water has low pH?
Answer
  • Scaling
  • High alkalinity
  • Stratification
  • Corrosion

Question 37

Question
What is recover time for a well?
Answer
  • The run time of a well pump
  • The time it takes to cool a well pump
  • The time required for the water level to return to the static water level after pumping has stopped
  • The time it takes to pump the maximum flow rate after the pump has started

Question 38

Question
Which disinfectant is most widely used for a public water system?
Answer
  • Chloramine
  • Chlorine
  • UV
  • Ozone

Question 39

Question
What is the purpose of a coupon in a water distribution system?
Answer
  • Remove tuberculation
  • Check the corrosiveness of water
  • Relieve excess pressure
  • Used to make a hot tap

Question 40

Question
What is a zone of influence for a well?
Answer
  • The area that covers the limits of cone of depression
  • The difference between the static water level and the pumping water level
  • The water level in the well when the pump is operating
  • The water level in the well when the pump has been turned off

Question 41

Question
What is one of the main benefits of repairing a water main while it is pressurized?
Answer
  • Safety of construction employees
  • Helps remove tuberculation
  • Allows crew to check the interior condition of the pipe
  • Minimizes the chances of contaminating the water supply

Question 42

Question
What is the recommended minimum horizontal separation between a new water main and an existing gravity sewer?
Answer
  • 1 foot
  • 5 feet
  • 10 feet
  • 20 feet

Question 43

Question
What must be done if a repeat sample tests positive for total coliform bacteria?
Answer
  • Test sample for Giardia
  • Test sample for E. coli
  • Test sample for Cryptosporidium
  • Test sample for viruses

Question 44

Question
What is dichloramine?
Answer
  • Free residual chlorine
  • A chemical used to dechlorinate water
  • Combined residual chlorine
  • Hypochlorous acid

Question 45

Question
What is used to check for fecal contamination in a water distribution system?
Answer
  • Presence / absence test for coliform bacteria
  • Cryptosporidium test
  • Virus analysis
  • Test for Gieardia

Question 46

Question
What is an appropriative water right?
Answer
  • A water right that is aquired with title to land, bordering surface water
  • A water right that is acquired through adverse possession of someone else's water right
  • A water right for a homeownder who purchased property adjacent to a river
  • A water right that is acquired for the beneficial use of water by following a specific legal procedure

Question 47

Question
What is holding time?
Answer
  • The time it takes to prime a pump
  • Elapsed time between sample collection and analysis
  • The time it takes chlorine to react with ammonia
  • The time it takes to flush a hydrant

Question 48

Question
Which water source is most protected from pathogens?
Answer
  • River
  • Lake
  • Deep well
  • Shallow aquider

Question 49

Question
What is a radial well?
Answer
  • Artesian well
  • Shallow well
  • A pilot well
  • A caisson with horizontally drilled wells

Question 50

Question
What is the purpose of packing in a pump?
Answer
  • Minimize leakage, while allowing a slight leak
  • Completely stop leakage
  • Impart velocity to the water
  • Protect shaft from excessive wear-and-tear

Question 51

Question
What is the purpose of seal water in a pump?
Answer
  • Increase pump pressure
  • Cool and lubricate the packings
  • Cool the motor
  • Clean the impeller

Question 52

Question
What is the purpose of a mechanical seal?
Answer
  • Create a water-tight bell and spigot joint for a pipe
  • Prevent surface water from contaminating the aquifer
  • Connect a new water main to an existing pipe
  • Prevent leakage from a pump

Question 53

Question
Which valve is commonly used in control valves?
Answer
  • Gate valve
  • Globe valve
  • Butterfly valve
  • Air release valve

Question 54

Question
Which terminology means "a sudden change in water pressure, caused by quickly opening or closing a valve?"
Answer
  • Corrosion
  • Tuberculation
  • Water Hammer
  • Cavitation

Question 55

Question
What type of sample should be used to test for bacteria?
Answer
  • Grab sample
  • Composite sample
  • Comprehensive sample
  • Mixed sample

Question 56

Question
_______________ is a condition in which dissolved oxygen is present in water?
Answer
  • Anaerobic
  • Aerobic
  • Thermocline
  • Hydrophobic

Question 57

Question
Which of the following is a secondary containment?
Answer
  • Aresenic
  • Nitrate
  • Manganese
  • Lead

Question 58

Question
What is true about a hydropneumatic tank?
Answer
  • Always sized for fire flow
  • Often used at a water treatment plant to store treated water
  • Typically found in large water systems to provide water via gravity flow
  • Provides inadequate fire protection

Question 59

Question
What is the purpose of a thrust block in a water distribution system?
Answer
  • Stop the flow of water
  • Restrain and prevent movement of the piping system
  • Push air bubbles out of the water main
  • A pump station that adds significant head to the water

Question 60

Question
What is the chlorine residual if the chlorine does is 3.3 mg/L and the chlorine demand is 1.2 mg/l?
Answer
  • 4.5 mg/L
  • 1.2 mg/L
  • 2.2 mg/L
  • 2.1 mg/L

Question 61

Question
Which of the following is a primary contaminant?
Answer
  • Iron
  • Manganese
  • Nitrate
  • Chloride

Question 62

Question
How often should large water meters be tested?
Answer
  • Every 1-4 years
  • Every 5-7 years
  • Bi-Monthly
  • Monthly

Question 63

Question
What is the purpose of using a jumper cable when removing a water meter?
Answer
  • Corrosion control
  • Maintain proper alignment of the service lateral
  • Prevent settling of the meter box
  • Avoid electrical shock

Question 64

Question
How does water temperature affect the effectiveness of chlorine?
Answer
  • Chlorine becomes less effective as the water temperature becomes warmer
  • The higher the temperature, the more rapid the rate of disinfection
  • Water temperature does not impact the effectiveness of chlorine
  • Chlorine effectiveness significantly fluctuates as the water temperature increases

Question 65

Question
What is per capita water usage?
Answer
  • The total amount of water used within a water distribution system each month
  • The total amount of water used by a water district each year
  • Average day demand divided by the total number of people served
  • The total amount of water used by a family in one year

Question 66

Question
Which chemical is commonly used as a liquid disinfectant in the water industry?
Answer
  • Sodium hypochlorite
  • Sodium chloride
  • Sodium hydroxide
  • Calcium hypochlorite

Question 67

Question
What is a volatile substance?
Answer
  • Inorganic matter
  • Organic matter
  • All suspended solids
  • All dissolved solids

Question 68

Question
What could cause water to appear black?
Answer
  • Arsenic
  • Nitrate
  • Manganese
  • Iron

Question 69

Question
What is the purpose of the drain hole in a dry barrel fire hydrant?
Answer
  • Relieve excess pressure
  • Dewater water main prior to repair
  • A drain hole is not commonly found on a dry barrel hydrant
  • Remove water from the barrel of the hydrant

Question 70

Question
What is a composite sample?
Answer
  • A single sample of water collected at a particular time and place
  • A sample to test for pH
  • A collection of individual samples obtained at regular intervals
  • A sample to test for coliform bacteria

Question 71

Question
What is the most common type of water meter for residential services?
Answer
  • Nutating disk water meter
  • Propeller water meter
  • Electromagnetic meter
  • Venturi meter

Question 72

Question
What is the proper way to close a hydrant valve?
Answer
  • Quickly close the valve
  • Slowly close the valve
  • Close the largest valve near the hydrant
  • Close the smallest valve on the adjacent water main

Question 73

Question
What problem would most likely occur if a pump motor is over greased?
Answer
  • Lantern ring is damaged
  • Packings wear out quickly
  • Mechanical seal becomes loose
  • Overheating

Question 74

Question
What is total dynamic head?
Answer
  • Friction loss
  • The difference in water level between the discharge side and suction side of the pump
  • Total static head + head loss
  • The water pressure on the discharge side of the pump

Question 75

Question
What is total static head?
Answer
  • The head on the suction side of the pump
  • The head on the discharge side of the pump
  • Friction loss when the pump is running
  • The vertical distance between the free water surface on the discharge side of the pump and the suction side of the pump

Question 76

Question
Which source water typically contains the most iron and manganese?
Answer
  • Groundwater
  • Lake
  • River
  • Stream

Question 77

Question
What is one of the roles of the attendant during confined space entry?
Answer
  • Authorize entry
  • Assess 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
  • Cancel the entry permit, as necessary
  • Verify 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

Question 78

Question
What is the source of E. coli?
Answer
  • Intestines of warm-blooded organisms
  • Reptiles
  • Fish
  • Vegetation

Question 79

Question
What will happen if the hydrochloric acid concentration in the water increases?
Answer
  • pH will increase
  • pH will be unaffected
  • pH will significantly fluctuate
  • pH will decrease

Question 80

Question
What is chlorine demand?
Answer
  • The amount of chlorine remaining after contact time
  • Total chlorine dosage
  • The difference between the total chlorine added to the water and the chlorine residual
  • The amount of chlorine injected into water

Question 81

Question
What is used to measure the flow rate of chlorine gas from a cylinder?
Answer
  • Ejector
  • Yoke clamp
  • Fusible plug
  • Rotameter

Question 82

Question
What does pH represent?
Answer
  • Hypochlorite concentration
  • Measure of hydrogen ion activity
  • Hydrogen peroxide concentration
  • Phosphorus and hydrogen concentration

Question 83

Question
What is typically used to measure flow rate in an open channel?
Answer
  • Nutating disk
  • Propeller
  • Weir
  • Positive displacement meter

Question 84

Question
What causes turbidity?
Answer
  • Suspended solids
  • Calcium
  • Sodium
  • Magnesium

Question 85

Question
Why would you not use Lead pipe?
Answer
  • Problem with connecting with pipes of different metals
  • tuberculation issues
  • Turbulence issues
  • Corrosion risks

Question 86

Question
Where is the shut off valve for a dry barrel hydrant?
Answer
  • Top of the hydrant
  • On the lateral
  • within 2 feet of the hydrant
  • Bottom of the hydrant with 2 drain holes

Question 87

Question
How many pounds of pressure on a 9" closed gate valve with a registered 60 psi?
Answer
  • 540 pounds
  • 2543 pounds
  • 3340 pounds
  • 4860 pounds

Question 88

Question
Who determines if a trench needs shoring?
Answer
  • Competent Person
  • Employee in the trench
  • Water Engineer
  • City Official

Question 89

Question
A green paint marking indicates what when excavating a 6 foot trench within 20 feet of a ladder?
Answer
  • Safe to dig here
  • Sewer lines near here
  • 5 feet from the safety of a ladder insertion point
  • Treated water line near here

Question 90

Question
Why would you open a dry barrel hydrant completely
Answer
  • To provide maximum flow
  • To flush the operating nut
  • To provide access to the drain holes
  • To test pH at the next hydrant

Question 91

Question
How would you check the residual pressure of a dry barrel fire hydrant?
Answer
  • Open the hydrant adjacent in the service line
  • Connect a potentiomenter
  • DPD tester
  • Step down test

Question 92

Question
How do you check the level of a chlorine gas cylinder?
Answer
  • Weight it
  • With an injector
  • Wiggle the cylinder
  • With a pressure guage

Question 93

Question
What strength is chlorine gas?
Answer
  • 12.5%
  • 25%
  • 65%
  • 100%

Question 94

Question
White paint markings indicate what?
Answer
  • Water line beneath ground
  • Telecommunications line beneath ground
  • Gas line beneath ground
  • Excavation area

Question 95

Question
What is the residual pressure in reference to measuring a fire hydrant residual pressure?
Answer
  • Pressure reading before water flows.
  • Measurement obtained by a pitot guage on the top of the hydrant
  • Pressure reading while water is flowing (from an outlet other than the flow outlet.)
  • Pressure remaining after all valves have been closed for 60 seconds or more

Question 96

Question
How long do you wait to flush the line after using the tablet method for a new line?
Answer
  • 1 hour
  • 6 hours
  • 24 hours
  • 48 hours

Question 97

Question
Which of the following is best for disinfecting short sections of pipe?
Answer
  • Slug Method
  • Tablet Method
  • Pigging Method
  • Fill Method

Question 98

Question
What is galvanic corrosion?
Answer
  • Galvanized pipe connected to pvc pipe
  • Copper connected to lead pipe
  • Pvc pipe connected to a pump
  • Galvanized pipe with high pH water

Question 99

Question
Which of the following are disinfection types used in water distribution systems
Answer
  • Calcium Hypychlorite
  • Sodium Hypochlorite
  • Sodium Thiosulfate
  • Chloramine

Question 100

Question
Which are used to dechlorinate water?
Answer
  • Sodium thiosulfate
  • calcium aerobic
  • ascorbic acid
  • sulfur dioxide
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