Pregunta 1
Pregunta
Which two acids are formed when chlorine gas is mixed with water?
Respuesta
-
Citric acid and hydrochloric acid
-
Hypochlorous acid and dichloramine
-
Hypochlorous acid and monochloramine
-
Hypochlorous acid and hydrochloric acid
Pregunta 2
Pregunta
Which of the following is a disinfection by-product (DBP)?
Respuesta
-
Methane
-
Chlorine
-
Trihalomethane
-
Chloramine
Pregunta 3
Pregunta
_____________ is a DBP precursor
Respuesta
-
Natural organic matter
-
Arsenic
-
Nitrate
-
Lead
Pregunta 4
Pregunta
Which of the following is a velocity meter?
Respuesta
-
Nutating disk
-
Propeller
-
Piston
-
Compound
Pregunta 5
Pregunta
What is true about a pipe with a C value of 100?
Respuesta
-
Very smooth interior
-
Very strong pipe
-
Very weak pipe
-
Very rough interior
Pregunta 6
Pregunta
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?
Respuesta
-
Combination map
-
Conditional map
-
Comprehensive map
-
Process schematic
Pregunta 7
Pregunta
Which terminology refers to the bottom of a pipe interior?
Respuesta
-
Invert
-
Crown
-
Lateral
-
Subsurface
Pregunta 8
Pregunta
Which of the following best describes transpiration?
Respuesta
-
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
Pregunta 9
Pregunta
Choose the best answer regarding coliform sampling.
Respuesta
-
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
Pregunta 10
Pregunta
What is the purpose of a venturi?
Pregunta 11
Pregunta
Which terminology is used to describe the upper surface of an unconfined aquifer?
Respuesta
-
Borehole
-
Drawdown
-
Water table
-
Zone of influence
Pregunta 12
Pregunta
What must be worn before entering a room with a chlorine gas leak?
Pregunta 13
Pregunta
How are disinfection by-products formed?
Respuesta
-
Chlorine reacts with arsenic
-
Chlorine reacts with nitrate
-
Chlorine reacts with iron
-
Chlorine reacts with natural organic matter
Pregunta 14
Pregunta
What is true about positive displacement pumps?
Respuesta
-
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
Pregunta 15
Pregunta
Which of the following is a strong base?
Respuesta
-
pH = 6
-
pH = 7
-
pH = 14
-
pH = 1
Pregunta 16
Pregunta
Which of the following is a non-transient, non-community water system?
Respuesta
-
School
-
Park
-
Motel
-
Restaurant
Pregunta 17
Pregunta
How many feet above the top of a trench must a ladder extend?
Respuesta
-
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
Pregunta 18
Pregunta
What is the purpose of a pitot gauge?
Pregunta 19
Pregunta
What is true about a fusible plug on a chlorine cylinder?
Respuesta
-
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
Pregunta 20
Pregunta
What is methemogrlobinemia
Pregunta 21
Pregunta
Which law set the national drinking water standards?
Pregunta 22
Pregunta
Which of the following is true about coliform sampling?
Respuesta
-
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
Pregunta 23
Pregunta
__________________ is a type of centrifugal pump.
Respuesta
-
Plunger pump
-
Piston pump
-
Vertical tubrine pump
-
Diaphragm pump
Pregunta 24
Pregunta
Which of the following is true regarding Tier 2 of the Public Notification Rule?
Respuesta
-
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
Pregunta 25
Pregunta
What is flexural strength of a pipe?
Respuesta
-
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
Pregunta 26
Pregunta
___________________ are types of impeller for a centrifugal pump.
Respuesta
-
Semi-open and closed
-
Positive and negative
-
Mechanical and packing
-
Cation and anion
Pregunta 27
Pregunta
What is the maximum practical suction lift for a centrifugal pump?
Respuesta
-
50 feet
-
Between 1 and 5 feet
-
Between 15 and 25 feet
-
75 feet
Pregunta 28
Pregunta
What is a Consumer Confidence Report?
Respuesta
-
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
Pregunta 29
Pregunta
What is back-siphonage?
Respuesta
-
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
Pregunta 30
Pregunta
What is used to test for leakages in pipes?
Respuesta
-
Pitot gauge
-
Pressure testing
-
Anode
-
Swab
Pregunta 31
Pregunta
What is a grout seal in a well?
Respuesta
-
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
Pregunta 32
Pregunta
What will cause a well pump to backspin after pumping has stopped?
Pregunta 33
Pregunta
____________________ is commonly implemented to resolve taste and odor issues in the water distribution system.
Pregunta 34
Pregunta
What would trigger a Level 1 Assessment for a distribution system that collects at least 40 total coliform samples per month?
Respuesta
-
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
Pregunta 35
Pregunta
What is residual drawdown?
Respuesta
-
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
Pregunta 36
Pregunta
What problem occurs when the water has low pH?
Respuesta
-
Scaling
-
High alkalinity
-
Stratification
-
Corrosion
Pregunta 37
Pregunta
What is recover time for a well?
Respuesta
-
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
Pregunta 38
Pregunta
Which disinfectant is most widely used for a public water system?
Respuesta
-
Chloramine
-
Chlorine
-
UV
-
Ozone
Pregunta 39
Pregunta
What is the purpose of a coupon in a water distribution system?
Pregunta 40
Pregunta
What is a zone of influence for a well?
Respuesta
-
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
Pregunta 41
Pregunta
What is one of the main benefits of repairing a water main while it is pressurized?
Respuesta
-
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
Pregunta 42
Pregunta
What is the recommended minimum horizontal separation between a new water main and an existing gravity sewer?
Respuesta
-
1 foot
-
5 feet
-
10 feet
-
20 feet
Pregunta 43
Pregunta
What must be done if a repeat sample tests positive for total coliform bacteria?
Pregunta 44
Pregunta
What is dichloramine?
Pregunta 45
Pregunta
What is used to check for fecal contamination in a water distribution system?
Pregunta 46
Pregunta
What is an appropriative water right?
Respuesta
-
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
Pregunta 47
Pregunta
What is holding time?
Respuesta
-
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
Pregunta 48
Pregunta
Which water source is most protected from pathogens?
Respuesta
-
River
-
Lake
-
Deep well
-
Shallow aquider
Pregunta 49
Pregunta
What is a radial well?
Pregunta 50
Pregunta
What is the purpose of packing in a pump?
Respuesta
-
Minimize leakage, while allowing a slight leak
-
Completely stop leakage
-
Impart velocity to the water
-
Protect shaft from excessive wear-and-tear
Pregunta 51
Pregunta
What is the purpose of seal water in a pump?
Pregunta 52
Pregunta
What is the purpose of a mechanical seal?
Respuesta
-
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
Pregunta 53
Pregunta
Which valve is commonly used in control valves?
Respuesta
-
Gate valve
-
Globe valve
-
Butterfly valve
-
Air release valve
Pregunta 54
Pregunta
Which terminology means "a sudden change in water pressure, caused by quickly opening or closing a valve?"
Respuesta
-
Corrosion
-
Tuberculation
-
Water Hammer
-
Cavitation
Pregunta 55
Pregunta
What type of sample should be used to test for bacteria?
Respuesta
-
Grab sample
-
Composite sample
-
Comprehensive sample
-
Mixed sample
Pregunta 56
Pregunta
_______________ is a condition in which dissolved oxygen is present in water?
Respuesta
-
Anaerobic
-
Aerobic
-
Thermocline
-
Hydrophobic
Pregunta 57
Pregunta
Which of the following is a secondary containment?
Respuesta
-
Aresenic
-
Nitrate
-
Manganese
-
Lead
Pregunta 58
Pregunta
What is true about a hydropneumatic tank?
Respuesta
-
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
Pregunta 59
Pregunta
What is the purpose of a thrust block in a water distribution system?
Respuesta
-
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
Pregunta 60
Pregunta
What is the chlorine residual if the chlorine does is 3.3 mg/L and the chlorine demand is 1.2 mg/l?
Respuesta
-
4.5 mg/L
-
1.2 mg/L
-
2.2 mg/L
-
2.1 mg/L
Pregunta 61
Pregunta
Which of the following is a primary contaminant?
Respuesta
-
Iron
-
Manganese
-
Nitrate
-
Chloride
Pregunta 62
Pregunta
How often should large water meters be tested?
Respuesta
-
Every 1-4 years
-
Every 5-7 years
-
Bi-Monthly
-
Monthly
Pregunta 63
Pregunta
What is the purpose of using a jumper cable when removing a water meter?
Pregunta 64
Pregunta
How does water temperature affect the effectiveness of chlorine?
Respuesta
-
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
Pregunta 65
Pregunta
What is per capita water usage?
Respuesta
-
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
Pregunta 66
Pregunta
Which chemical is commonly used as a liquid disinfectant in the water industry?
Respuesta
-
Sodium hypochlorite
-
Sodium chloride
-
Sodium hydroxide
-
Calcium hypochlorite
Pregunta 67
Pregunta
What is a volatile substance?
Respuesta
-
Inorganic matter
-
Organic matter
-
All suspended solids
-
All dissolved solids
Pregunta 68
Pregunta
What could cause water to appear black?
Respuesta
-
Arsenic
-
Nitrate
-
Manganese
-
Iron
Pregunta 69
Pregunta
What is the purpose of the drain hole in a dry barrel fire hydrant?
Respuesta
-
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
Pregunta 70
Pregunta
What is a composite sample?
Respuesta
-
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
Pregunta 71
Pregunta
What is the most common type of water meter for residential services?
Pregunta 72
Pregunta
What is the proper way to close a hydrant valve?
Pregunta 73
Pregunta
What problem would most likely occur if a pump motor is over greased?
Pregunta 74
Pregunta
What is total dynamic head?
Respuesta
-
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
Pregunta 75
Pregunta
What is total static head?
Respuesta
-
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
Pregunta 76
Pregunta
Which source water typically contains the most iron and manganese?
Respuesta
-
Groundwater
-
Lake
-
River
-
Stream
Pregunta 77
Pregunta
What is one of the roles of the attendant during confined space entry?
Respuesta
-
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
Pregunta 78
Pregunta
What is the source of E. coli?
Pregunta 79
Pregunta
What will happen if the hydrochloric acid concentration in the water increases?
Pregunta 80
Pregunta
What is chlorine demand?
Respuesta
-
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
Pregunta 81
Pregunta
What is used to measure the flow rate of chlorine gas from a cylinder?
Respuesta
-
Ejector
-
Yoke clamp
-
Fusible plug
-
Rotameter
Pregunta 82
Pregunta
What does pH represent?
Respuesta
-
Hypochlorite concentration
-
Measure of hydrogen ion activity
-
Hydrogen peroxide concentration
-
Phosphorus and hydrogen concentration
Pregunta 83
Pregunta
What is typically used to measure flow rate in an open channel?
Pregunta 84
Pregunta
What causes turbidity?
Respuesta
-
Suspended solids
-
Calcium
-
Sodium
-
Magnesium
Pregunta 85
Pregunta
Why would you not use Lead pipe?
Pregunta 86
Pregunta
Where is the shut off valve for a dry barrel hydrant?
Pregunta 87
Pregunta
How many pounds of pressure on a 9" closed gate valve with a registered 60 psi?
Respuesta
-
540 pounds
-
2543 pounds
-
3340 pounds
-
4860 pounds
Pregunta 88
Pregunta
Who determines if a trench needs shoring?
Respuesta
-
Competent Person
-
Employee in the trench
-
Water Engineer
-
City Official
Pregunta 89
Pregunta
A green paint marking indicates what when excavating a 6 foot trench within 20 feet of a ladder?
Pregunta 90
Pregunta
Why would you open a dry barrel hydrant completely
Respuesta
-
To provide maximum flow
-
To flush the operating nut
-
To provide access to the drain holes
-
To test pH at the next hydrant
Pregunta 91
Pregunta
How would you check the residual pressure of a dry barrel fire hydrant?
Pregunta 92
Pregunta
How do you check the level of a chlorine gas cylinder?
Respuesta
-
Weight it
-
With an injector
-
Wiggle the cylinder
-
With a pressure guage
Pregunta 93
Pregunta
What strength is chlorine gas?
Pregunta 94
Pregunta
White paint markings indicate what?
Pregunta 95
Pregunta
What is the residual pressure in reference to measuring a fire hydrant residual pressure?
Respuesta
-
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
Pregunta 96
Pregunta
How long do you wait to flush the line after using the tablet method for a new line?
Respuesta
-
1 hour
-
6 hours
-
24 hours
-
48 hours
Pregunta 97
Pregunta
Which of the following is best for disinfecting short sections of pipe?
Respuesta
-
Slug Method
-
Tablet Method
-
Pigging Method
-
Fill Method
Pregunta 98
Pregunta
What is galvanic corrosion?
Respuesta
-
Galvanized pipe connected to pvc pipe
-
Copper connected to lead pipe
-
Pvc pipe connected to a pump
-
Galvanized pipe with high pH water
Pregunta 99
Pregunta
Which of the following are disinfection types used in water distribution systems
Respuesta
-
Calcium Hypychlorite
-
Sodium Hypochlorite
-
Sodium Thiosulfate
-
Chloramine
Pregunta 100
Pregunta
Which are used to dechlorinate water?
Respuesta
-
Sodium thiosulfate
-
calcium aerobic
-
ascorbic acid
-
sulfur dioxide