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