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Water Distrib Exam Class I
Water Distribution Exam Class I
81
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06/18/2007

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Term
The size of water mains, pumping stations, and storage tanks is primarily determined by _______?
A. Maximum day demand during any 24-hour period during the previous year
B. Population served
C. Per-capita water use
D. Fire Protection requirements
Definition
D. Fire Protection requirements
Term
Which of the following is a measure of the smoothness of a pipe?
A. S factor
B. C value
C. Hazen-Williams formula
D. T factor
Definition
B. C value

The higher the C value the smoother the pipe. Hazen-Williams formula calculates pipe size.
Term
Why is excessive water pressure to residential homes objectionable?
A. increases particulate matter reaching the customer
B. Causes erosion of the copper plumbing due to the high velocities, giving the water a metallic taste
C. Decreases the life of wa
Definition
C. Decreases the life of water heaters and other water-using appliances
Term
What is the best time to perform a flushing program on the mains?
A. Spring when the weather is usually mild
B. Fall when water usage is low and the weather not yet harsh
C. Late at night to lessen traffic disruption and minimize customer complaints.
Definition
C. Late at night to lessen traffic disruption and minimize customer complaints.
Term
Calculate the pounds per square inch pressure at the bottom of a tank,if the water level is 33.11 ft deep?
A. 14.3 psi
B. 28.6 psi
C. 33.1 psi
D. 76.5 psi
Definition
A. 14.3 psi

psi=depth,ft = 33.11 ft = 14.3psi
2.31 ft/psi = 2.31 ft/psi
(Divided By)
Term
As temperature of the water increases, the disinfecting action of chlorine is _________?
A. More Effective
B. Not affected
C. Less Effective
D. Likely to increase DO
Definition
A. More Effective
Term
Large full storage tanks are typically disinfected with a chlorine residual of _________?
A. 3 mg/L
B. 10 mg/L
C. 25 mg/L
D. 50 mg/L
Definition
B. 10 mg/L
Term
Why is a well acidified?
A. Take out soluble iron or manganese
B. Increase the well's productivity
C. Remove objectional gases
D. Remove Turbidity
Definition
B. Increase the well's productivity
Term
What is the PRIMARY source of coliforms in a water supply?
A. Insects that live or die in the water source
B. Protozoans and other microorganisms
C. Fertilizers
D. Fecal material from warm-blooded animals
Definition
D. Fecal material from warm-blooded animals
Term
pH is a measure of ___________?
A. Conductivity
B. Water's ability to neutralize acid
C. Hydrogen ions
D. Dissolved Solids
Definition
C. Hydrogen ions
Term
What is the term for a framework of wood or metal installed to prevent caving of trench walls?
A. Sheeting
B. Sloping
C. Shielding
D. Shoring
Definition
D. Shoring
Term
Which one of the service line materials is NOT flexible?
A. Copper
B. Galvanized iron
C. Lead
D. Plastic
Definition
B. Galvanized Iron
Term
Which type of pipe is typically used in the construction of very large water mains?
A. Asbestos-cement
B. Steel
C. Plastic
D. Galvanized
Definition
B. Steel
Term
Air-relief valves are installed to ____________?
A. Release some of the energy created by water hammer
B. Stop flow completely when tank is full
C. Vent air that has accumulated in the well column while the well is not in use
D. Turn off pressure duri
Definition
C. Vent air that has accumulated in the well column while the well is not in use
Term
After a new water main is installed and pressure tested, it should be ____?
A. Flushed with clean water for 24 hours & put into service
B. Filled with a solution of 25 ppm - 50 ppm free chlorine for at least 24 hours prior to flushing
C. Filled with cl
Definition
B. Filled with a solution of 25 ppm - 50 ppm free chlorine for at least 24 hours prior to flushing
Term
Which type of hydrant has no main valve but has a separate valve for each nozzle?
A. Wet-barrel
B. Warm-climate
C. Dry-barrel
D. Breakaway
Definition
A. Wet-barrel
Term
What is the maximum theoretical suction lift of a centrifugal pump at sea level?
A. 10 ft
B. 34 ft
C. 52 ft
D. 85 ft
Definition
B. 34 ft
Term
What type of motor is the simplest of all AC motors, with rotors consisting of a series of bars placed in slots?
A. Squirrel-cage
B. Wound-rotor
C. Capacitor-start
D. Synchronous
Definition
A. Squirrel-cage
Term
What does SCADA stand for?
A. Statistical Calculations and Data Analysis
B. Supervisory Control and Data Aquisition
C. Standard Computer and Data Accessory
D. Sample Concentration and Data Analyzer
Definition
B. Supervisory Control and Data Aquisition
Term
Which of the following type of valve is used in maintaiing prime to a pump?
A. Foot
B. Suction
C. Vacuum header
D. Butterfly
Definition
A. Foot
Term
Depending on its concentration and length of exposure, which of the following gases can cause lung and skin irritation?
A. Carbon Monoxide
B. Chlorine
C. Methane
D. Nitrogen
Definition
B. chlorine
Term
What class of fire involves electrical equipment?
A. Class A
B. Class B
C. Class C
D. Class D
Definition
C. Class C
Term
When a permit is required to enter a confined space, who may sign the permit?
A. Entrant
B. Person Attending
C. Entry Supervisor
D. OSHA Representative
Definition
C. Entry Supervisor
Term
When any piece of electrical equipment is being worked on, the circuit breaker should be ____________?
A. Painted when repair is complete
B. Videotaped for future reference
C. De-Energized and locked out
D. Replaced
Definition
C. De-Energized and locked out
Term
OSHA is an acronym for ____________?
A. Organization for Safe Health Administration
B. Occupational Safety and Health Administration
C. Occupational, Safety and Health Act
D. Organization of State Health Administrator
Definition
B. Occupational Safety and Health Administration
Term
The SDWA defines a public water system that supplies piped water for human consumption as one that has __________?
A. 10 service connections or serves 20 or more people for 60 dyas or more per year
B. 15 service connections or serves 30 or more people f
Definition
D. 15 service connections or serves 25 or more people for 60 days or more per year
Term
The most common water complaints are taste, odor, and _____________?
A. pH level
B. Faucet pressure
C. Colored Water
D. Leaking pipes
Definition
C. Colored Water
Term
What US agency establishes dring water standards?
A. AWWA
B. USEPA
C. NOISH
D. NSF
Definition
B. USEPA
Term
Why should the water operator contact area companies with underground utilities before starting an underground repair job?
A. To determine if there have been recent excavations in that location
B. To ask companies to locate and mark the location of thei
Definition
B. To ask companies to locate and mark the location of their utilities in the area of the repair job
Term
According to the USEPA regulations, the owner or operator of a public water system that fails to comply with applicable monitoring requirements must give notice to the public within ________?
A. 1 wk of the violation in a letter hand-delivered to custome
Definition
C. 3 months of the violation in a daily newspaper in the area served by the system
Term
In a 6-in pipeline needs to be flushed. if the desired length of pipeline to be flushed is 316 ft, how many minutes will it take to flush the line at 31 gpm?
A. 10 minutes
B. 15 minutes
C. 30 minutes
D. 60 minutes
Definition
B. 15 minutes
Term
What is the area of a trench that is 22.4 ft long and 3.3 ft wide?
A. 26 sq ft
B. 74 sq ft
C. 143 sq ft
D. 187 sq ft
Definition
B. 74 sq ft
Term
Which of the following is typically associated with trihalomethanes?
A. High levels of carbon dioxide in surface water source
B. Surface water high in inorganics
C. Water with organics that has been chlorinated
D. Groundwater or surface water high in
Definition
C. Water with organics that has been chlorinated
Term
Which of the following mandates the language & methods for public notification?
A. American Water Works Association
B. National Rural Water Association
C. US Environmetal Protection Agency
D. California State University
Definition
C. US Environmetal Protection Agency
Term
What is the primary source of lead in drinking water?
A. Lakes
B. Rivers near lead mines
C. Corrosion of plumbing systems
D. Groundwater
Definition
C. Corrosion of plumbing systems
Term
Interior copper tubing is usually joined by _____________?
A. Solder
B. Flare
C. Compression
D. Union
Definition
A. Solder
Term
Fire demand can account for what percent of the total capacity of a storage system?
A. 20%
B. 30%
C. 40%
D. 50%
Definition
D. 50%
Term
Which type of piping is most resistant to corrosion?
A. Plastic
B. Stainless Steel
C. Concrete
D. Asbestos-cement
Definition
A. Plastic
Term
Which of the following metals make the best anode?
A. Brass
B. Cast iron
C. Zinc
D. Copper
Definition
C. Zinc
Term
What is the minimum contact time when using the chlorine tablet method of disinfection?
A. 6 hours
B. 12 hours
C. 18 hours
D. 24 hours
Definition
D. 24 hours
Term
Piping containing reclaimed water should be painted what color?
A. Orange
B. Yellow
C. Purple
D. Red
Definition
C. Purple
Term
What is the pounds per sq inch pressure at the bottom of a tank if the water level is 38.29 ft?
A. 7.3 psi
B. 16.6 psi
C. 53.9 psi
D. 88.4 psi
Definition
B. 16.6 psi
Term
If a trench is 644 ft long, 3.5 ft wide, and 5.0 ft deep, approximately how many cubic yards of soil were excavated?
A. 140 cu yd
B. 300 cu yd
C. 420 cu yd
D. 450 cu yd
Definition
C. 420 cu yd
Term
Calculate the average pH given the following data:
1= 7.45 2=7.49 3=7.56 4=7.63 5=7.60 6=7.54 7=7.53 8=7.41
A. 7.4
B. 7.5
C. 30.1
D. 60.2
Definition
B. 7.5
Term
What percent is 34,411 of 74,818?
A. 34.411%
B. 45.993%
C. 74.818%
D. 217.42%
Definition
B. 45.993%
Term
A solution was found to be 63.5% calcium hypochlorite. What is the milligrams per liter of calcium hypochlorite in the solution?
A. 1,000
B. 10,000
C. 63,500
D. 635,000
Definition
D. 635,000 mg/L
Term
What is the diameter of a tank with a circumference of 408.2 ft?
A. 31 ft
B. 130 ft
C. 260 ft
D. 1,282 ft
Definition
B. 130 ft
Term
What is the difference between weak acid & strong acid?
A. Amount of hydrogen ions released
B. Amount of buffering released
C. Amount of Hydroxyl ions released
D. Amount of carbonate ions released
Definition
A. Amount of hydrogen ions released
Term
Which of the following analytical tests is the most important?
A. Coliform bacteria
B. Iron
C. Manganese
D. Hardness
Definition
A. Coliform bacteria
Term
Fuels, oils, gasoline, and other organic compounds may permeate which tpe of piping?
A. Plastic
B. Asbestos-concrete
C. Fiberglass
D. Concrete
Definition
A. Plastic
Term
How long should a new tank be disinfected before a water sample is collected for coliform analysis?
A. 6 hours
B. 12 hours
C. 24 hours
D. 48 hours
Definition
C. 24 hours
Term
What type of concrete reservoir is constructed much like a swimming pool, it is rather shallow, and difficult to cover?
A. Cast-in-place concrete
B. Hydraulically applied concrete-lined
C. Circular prestressed-concrete
D. Prestressed concrete-wire-wou
Definition
A. Cast-in-place concrete
Term
Which of the following types of valves is the best to use to maintain the water level in a tank?
A. Altitude
B. Tapping
C. Butterfly
D. Needle
Definition
A. Altitude
Term
Why should isolation valves be installed at frequent intervals in distribution piping?
A. To stop water from flowing backward thrugh a pump that is not in operation
B. To throttle flow and maintain a lower pressure in the lower distribution system zone
Definition
D. So that small sections of water main may be shut off for maintenance
Term
What is the internal surface area of a cylindrical tank (bottom, top, and the cylindaer wall), if it is 125.0 ft in diameter and 48.5 ft high?
A. 6,063 sq ft
B. 19,063 sq ft
C. 24,531 sq ft
D. 43,567 sq ft
Definition
D. 43,567 sq ft
Term
A trench that averages 4.2 ft wide & 5.4 ft in depth is dug for the purpose of installing a 24-in diameter pipeline. If the trench is 1,287 ft long, how much soil in cubic feet will be put into the trench after the pipe is in place, assuming that the onl
Definition
C. 25,000 cu ft

Volume,cu ft=(L)(W)(D) (Soil Removed)
Volume, cu ft=(.785)(D2)(Length) (Volume pipe Occupies)
Term
Customers usually notice turbidity readings in excess of how many nephelometric turbidity units?
A. 2
B. 3
C. 4
D. 5
Definition
D. 5
Term
What is the recommended chlorine dosage when disinfecting a water main using the tablet method?
A. 25 mg/L
B. 50 mg/L
C. 75 mg/L
D 100 mg/L
Definition
B. 50 mg/L
Term
What water quality problem is most likely to occur at dead-end water mains?
A. Dirty Water
B. Taste & Odor
C. Milky Water due to air bubbles
D. Dirty Clothes due to manganese
Definition
B. Taste & Odor
Term
Asbestos-cement pipe contains which of the following material?
A. Fiberglass
B. Silica sand
C. Polyethylene
D. Silica lime
Definition
B. Silica sand. Portland cement & asbestos fibers are also used in asbestos-cement pipes.
Term
What is the primary purpose of well grouting?
A. Protect the well casing from corrosion
B. Seal off poor-quality aquifers
C. Prevent surface water contamination from entering the water that is being drawn into the well
D. Protect the casing by restrai
Definition
C. Prevent surface water contamination from entering the water that is being drawn into the well
Term
Which type of butterfly valve connection is best to use underground?
A. Mechanical Joint
B. Flanged Joint
C. Lug wafer joint
D. Check joint
Definition
A. Mechanical joint
Term
What type of concrete tank is made like a home basement but with more reinforcements?
A. Cast-in place concrete
B. Hydraulically applied concrete-lined
C. Circular prestressed-concrete
D. Prestressed concrete-wire-wound
Definition
A. Cast-in place concrete
Term
The pressure a the lowest bottm point of a clear well is 13.2 psi. What is the total water depth of the clear well at its lowest point?
A. 23.1 ft
B. 30.5 ft
C. 61.0 ft
D. 69.3 ft
Definition
B. 30.5 ft

Pressure,psi=depth of water (divided by) 2.31 ft/psi
Term
How many hours must the water remain undisturbed in a pipe before collecting a sample for lead and copper analysis?
A. 4 hours
B. 6 hours
C. 8 hours
D. 24 hours
Definition
B. 6 hours
Term
When present in water, which of the following will increase corrosion rates?
A. Zinc Orthophosphate
B. Dissolved Oxygen
C. Silicate compounds
D. Bicarbonate ion
Definition
B. Dissolved Oxygen
Term
What is the recommended chlorine dosage when disinfecting a water main using the slug method?
A. 50 mg/L
B. 100 mg/L
C. 125 mg/L
D. 300 mg/L
Definition
D. 300 mg/L
Term
If a confined aquifer's recharge area is elevated, the water in the aquifer will be _________?
A. Contaminated
B. High in iron & manganese
C. Under pressure
D. Soft
Definition
C. Under pressure
Term
Which one of the following service line materials may cause corrosion when connected to brass valves?
A. Galvanized Iron
B. PVC
C. Copper
D. Plastic
Definition
A. Galvanized iron
Term
When is the best time to conduct a leak survey?
A. Night when noise is lowest
B. During low water usage
C. When the ground has been dry a while
D. During periods of high water usage
Definition
A. Night when noise is lowest
Term
PVC pipe can use Tees, elbows, and other fittings from what other type of pipe?
A. Prestressed concrete cylinder
B. Ductile iron
C. Concrete
D. Asbestos-cement
Definition
B. Ductile iron
Term
Water use for peak hour demand is determined by the highest 1-hour period during one __________?
A. Day
B. Week
C. Month
D. Year
Definition
D. Year
Term
The zone of influence is defined as the ____________?
A. Distance from a well that the cone of depression affects the normal water level
B. Depression around a well of the water surface caused by pumping water from the well
C. Change in water elevation
Definition
A. Distance from a well that the cone of depression affects the normal water level
Term
The secondary standard for iron recommends that the concentration not exceed __________?
A. 0.30 mg/L
B. 0.40 mg/L
C. 0.50 mg/L
D. 0.60 mg/L
Definition
A. 0.30 mg/L
Term
What is the name of the pipe that serves as the inlet and outlet to an elevated tank?
A. Pedestal
B. Riser
C. Main Pedestal
D. Service
Definition
B. Riser
Term
What type of ductile-iron pipe joint is quickly assembled and is the least expensive?
A. Flanged joint
B. Mechanical joint
C. Push-on joint
D. Ball-and-socket Joint
Definition
C. Push-on joint
Term
Where are the most common location of leaks on old service connections?
A. Household plumbing
B. Connections to the curb stop
C. Connections at the gate valve
D. Pressure regulator
Definition
B. Connections to the curb stop
Term
Which of the following best defines the term "drawdown"?
A. Water level in a well after a pump has operated over a period of time
B. Change in water elevation from the normal level to the pumping level
C. Distance from a well that the cone of depressio
Definition
B. Change in water elevation from the normal level to the pumping level
Term
Which style of curb box eliminates the possibility of misalignment?
A. Arch Style
B. Montgomery style
C. Minneapolis style
D. Chicago Style
Definition
C. Minneapolis Style
Term
What is the term for the height to which a column of water will rise in a well?
A. Potentiometric surface
B. Groundwater level
C. Piezometric surface
D. Residual drawdown
Definition
C. Piezometric surface
Term
Which of the following determines the number of samples that must be collected for utilities that are monitoring for lead & copper for the first time?
A. System Size
B. Type of water source
C. Amount of water produced
D. Area Served
Definition
A. System Size