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52 Cards in this Set
- Front
- Back
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7.48 gallons = |
1 cubic ft |
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1 cubic ft = |
7.48 gallons |
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MGD |
Million gallons per day |
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GPD |
Gallons per day |
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GPM |
Gallons per minute |
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CFS |
Cubic feet per second |
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PSI will always be the ____ # compared to the ft of head |
Smaller |
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Ft of head will always be the ____ # compared to the psi |
Bigger |
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2.31 ft of head = |
1 psi |
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1 psi = |
2.31 ft of head |
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Maximum psi in system |
80 psi |
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Normal psi in system = |
35-65 psi |
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Minimum psi in system |
20 or below |
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PSI |
Pounds per square inch |
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Maximum total chlorine level = |
4.0 mg/L |
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Minimum total chlorine level = |
1.5 mg/L |
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Minimum free chlorine level = |
.30 mg/L |
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Bacteria samples should be filled to _____ |
100 ml or 1”from the top |
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Bacteria samples should be shipped within ______ |
30 hours |
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If you are given the purity you should ____ by it |
Divide |
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VFD or VSD are both do this |
Electronically control flow |
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Water mains must be able to handle working pressures of ____ psi or higher and _____. |
100 and Surge Pressure (water hammer) |
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Gate Valves |
Designed to start and stop flow |
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Butterfly valves |
Open quickly, used for on-off operation, may be used to throttle flow |
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Check valves |
Allow water flow in only one direction |
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Pressure reducing valves |
Operate automatically to throttle water flow |
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Altitude valves |
Are used to fill reservoirs |
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Air relief valves |
Allows air to be released from the main or column pipe of a well |
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There should be _____ ft of horizontal separation between water and sewer lines |
10 |
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There should be _____ “ of vertical separation between water and sewer lines |
18 |
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Fire hydrants should be spaced every _____ to ______ ft in residential areas |
300 to 600 |
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Fire hydrants should be place a maximum of _____ ft in commercial areas |
800 |
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Fire hydrants should be set back at least ____ ft from the curb |
2 |
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Taps are located _____ degrees down from the top of the main |
45 |
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The difference between the static groundwater and pumping level is A. Radius of influence B. Drawdown C. Cone of depression D. Watershed |
Drawdown |
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One indication of corrosive water is a high concentration of A. Algae odors B. Carbon dioxide C. Carbonates D. Total dissolved solids |
Carbon dioxide |
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The component part of a well include all the following except A. Sanitary seal B. Well screen C. Pressure switch D. Cement grout |
Pressure switch |
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Which of the following is the principal constituent in water that causes corrosion of metals A. Alkalinity B. Dissolved oxygen C. Hydrogen sulfide D. Sodium chloride |
Hydrogen sulfide |
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Velocity of flow in mains is usually expressed in terms of A. Feet per second B. Gallons per minute C. Liters per foot D. Milligrams per liter |
Feet per second |
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Disease causing bacteria are known as A. Coliform B. Noncoliforms C. Nonpathogenic D. Pathogenic |
Pathogenic |
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Normally surface water and groundwater have a pH range of A. 9.0 to 10.5 B. 6.8 to 8.5 C. 1.5 to 4.0 D. None of the above |
6.8 to 8.5 |
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The component of a centrifugal pump sometimes installed on the end of a suction pipe to hold the priming is known as A. Casing B. Drain C. Foot valve D. Ventilator |
Foot valve |
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The principal purpose of an altitude valve on a n elevated tank is to |
Control maximum filling level in distribution storage |
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Moderately hard water will have a range of _____ to ______ mg/L as calcium carbonate |
61 to 120 |
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Common method for removing hydrogen sulfide from water is A. Aeration B. Coagulation C. Filtration D. Sedimentation |
Aeration |
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Disease that may be transferred to a victim through water is A. Diphtheria B. Gonorrhea C. Malaria D. Typhoid |
Typhoid |
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MCL |
Maximum contaminant level |
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The primary source of trihalomethane (THMs) in drinking water is A. Industrial solvents B. Polymer coagulants C. Leaching from lining in storage tanks D. Reaction of chlorine compounds & organic matter |
Reaction of chlorine compounds & organic matter |
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The primary health risk of trihalomethane (THMs) is A. Gastrointestinal disease B. Nervous system damage C. Cancer D. Increased blood pressure |
Cancer |
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The primary health concern of synthetic organic compounds is A. Acute respiratory disease B. Cancer C. “Blue baby syndrome” D. Reduced iq in children |
Cancer |
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Pressure in a pipeline may be affected by |
Friction and elevation |
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High nitrate concentrations in water can cause |
Blue baby syndrome |
