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268 Cards in this Set
- Front
- Back
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Community water systems that add a disinfectant to water and serve a population of _______ or more are required to monitor for total trihalomethanes A. 1,000 B. 3,300 C. 10,000 D. 25,000 |
10,000 |
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Which valve is most suitable for a throttling application A. Ball B. Check C. Gate D. Tapping |
Ball |
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To minimize iron from precipitating in the distribution system, ____ is decreased. A. Carbon dioxide B. Lime dose C. pH D. Temperature |
Carbon dioxide |
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Single phasing of a motor means A. A one-stage operation B. Loss of one power phase C. an in-pase system D better operation for a motor |
Loss of one power phase |
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What affects the flow capacity of an installed pipeline? A. Pipe size, turbidity, and manhole spacing B. Pipe size, manhole spacing and temperature C. Pipe material, invert elevation, an Pipe size D. Pipe size, pipe material, and grade |
Pipe size, pipe material, and grade |
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Disinfection residuals for surface water supplies must be measure at the entry point to the distribution system. The minimum acceptable residual is A. 0.1 mg/L B. 0.2 mg/L C. 0.3 mg/L D. 0.4 mg/L |
0.2 mg/L |
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Treatment techniques rather than maximum contaminant levels (MCLs) are established for Giardia, viruses, and legionella because A. No commonly available test exists for these microorganisms B. The MCL for these microorganisms is too low to measure with current technology C the levels of these microorganisms that are considered safe are unknown D. All of the above |
No commonly available test exists for these microorganisms |
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As water temperature decreases, the disinfecting action of chlorine A. Decreases B. Increases C. Remains the same D. Doubles |
Decreases |
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Improper rotation In a centrifugal pump may cause A. Worn bearings B. Impeller spin off C. Over pressure D. Reverse flow
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Impeller spin off |
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The sample bottle should be filled to __ when collecting a bacteriological sample. A. Half way or more B. Wihin 1 inch of the top C. Overflowing D. The top |
Within 1 inch of the top |
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When testing for chlorine residuals at various points in the distribution system, it is most important to A. Collect all samples before testing so that a true comparison can be made B. Collect samples for bacteriological examination at each sampling point to determine if enough chlorine is added. C. Perform each test at the time the sample is collected D. Taste the pH and alkalinity at each sampling point in order to determine the effectiveness of the chlorine |
Perform each test at the time the sample is collected |
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Which type of valve on the discharge side of the pump is most effective in reducing pressure surges when starting or stopping the pump? A. Controlled globe valves B. Foot valves C. Gate valves D. Air relief valves |
Controlled globe valves |
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The purpose of a bypass valve in larger-size gate valves is to A. Equalize pressure on both sides on a larger gate B. Prevent the backward flow of water C. Allow for drainage of surplus water D. None of the above |
Equalize pressure on both sides on a larger gate |
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Which of the following conditions must you change when your chlorine residual is in hypochlorite ion form. A. Calcium B. Hardness C. pH D. Total alkalinity |
Total alkalinity |
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When a potable water supply is used to provide clean water to water Seals on pumps, the connection should be made with a ____ to the potable water supply. A. Pressure relief valve B. Check valve C. Gate valve D. Vacuum breaker |
Vacuum breaker |
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A gas chlorinator has been diagnosed with following conditions: 1) chlorine cylinder valve closed 2) ball in rotameter drops to zero 3) ejector water supply is off 4) chlorine supply indicator at unit shows no supply. 5) Chlorine supply indicator resets after 10 minutes. What is the most likely cause of the chlorinator problem? A. Vacuum leak after the indicator tube B. Injector clogged C. Ejector water supply valve closed D. Ejector nozzle clogged |
Vacuum leak after the indicator tube |
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Which disinfection residual causes chlorinous taste or odor problems? A. Hypochloous acid B. Dichloramine C. Monochloramine D. Hypochlorite ion |
Dichloramine |
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At the same flow, friction losses through a 12-inch line are ________ through a 6-inch line A. Less than B. The same as C. Slightly more than D. Twice as much as |
Less than |
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The germicidal effect of chlorine is believed to be a result of which one of the following? A. Reduction of surface tension B. Presence of free alkali C. Penetration of the cell wall and attack of critical cell enzyme D. Electrolytic action of the chlorine radicals |
Penetration of the cell wall and attack of critical cell enzyme |
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Which is the best method to remove sand from water? A. Add lime B. Aerate C. Provide a settling tank D. Use zeolite softening |
Provide a settling tank |
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Iron and manganese form insoluble compounds by reacting with A. Alum B. Dissolved oxygen C. Ion exchange resins D. Lime |
Dissolved oxygen |
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At which time of day is the age of the water stored in the distribution the most A. early morning B. Late morning C. Early afternoon D. Late evening
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Late evening |
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Which type of maps should not overlap eachother? A. Index maps B. Comprehensive maps C. Construction maps D. Sectional maps |
Sectional maps |
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Which one of the following is a type of joint for ductile iron piping? A. Welded joint B. Expansion joint C. Flexible ball joint D. Bell an spit with rubber o-ring |
Flexible ball joint |
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The amount of energy in feet required to overcome resistance to flow in a pipe is called A. Pump head B. cutoff head C. Pressure head D. Friction head |
Friction head |
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Which of the following is a type of joint for high-density polyethylene piping? A. Bell and spigot type B. Thermal butt-fusion C. Push-on joint D. Restrained joint |
Thermal butt-fusion |
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Which of the following is a type of joint for ductile iron piping? A. Welded joint B. Restrained joint C. Expansion joint D. Rubber gasket joint |
Restrained joint |
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Minor head losses are caused by A. Slime growths and corrosion or scaling B. Corrosion and tuberculation C. Type of pipe material and "C" factor D. Sudden changes in direction or velocity of flow |
Sudden changes in direction or velocity of flow |
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The most desirable residential pressure ranges from A. 20 to 35 psi B. 35 to 50 psi C. 50 to 75 psi D. 75 to 90 psi |
50 to 75 psi |
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Which is pipe strength expressed in? A. Hydrostatic potential B. Psi and durability C. Tensile and flexture strength D. Baud units |
Tensile and flexture strength |
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Most water systems use hydrants with two nozzles with diameters of ________. And one nozzle with a diameter of _________. A. 2.0 inches; 3.0 inches B. 2.0 inches; 4.0 inches C. 2.5 inches; 3.5 inches D. 2.5 inches; 4.5 inches |
2.5 inches; to 4.5 inches |
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Which type of pipe is durable and strong, has high flexural strength and good corrosion resistance, and is easily tapped? A. High-density polyethylene B. Steel C. Ductile iron D. Reinforced concrete |
Ductile iron |
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Precipitation softening of water treatment plants try to end up with distribution system water that is A. Slightly scale forming B. Moderate scale forming C. Neutral D. In equilibrium |
Slightly scale forming |
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Which is a closed fire line? A. Broken fire hydrant or pipeline that feeds a fire hydrant B. Unmetered connection for a fire protection system C. Closed valve to a fire hydrant D. Closed valve to a fire sprinkler system |
Unmetered connection for a fire protection system |
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Comprehensive maps of medium to large systems generally have scales ranging from? A. 250 to 500 feet to 1 inch B. 500 to 1000 feet to 1 inch C. 1000 to 1500 feet to 1 inch D. 250 to 400 feet to 1 inch |
500 to 1000 feet to inch |
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Sectional maps generally have scales ranging from A. 50 to 100 feet to 1inch B. 100 to 200 feet to 1inch C. 200 to 250 feet to 1inch D. 250 to 400 feet to 1inch |
50 to 100 feet to 1inch |
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Which type of centrifugal pumps are the most common? A. Axial flow impellers B. Radial flow impellers C. Mixed flow impellers D. vertical flow impellers |
Radial flow impellers |
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Which of the following is a type of joint for ductile iron piping? A. Welded joint B. Bell and spigot joint C. Expansion joint D. Flanged joint |
Flanged joint |
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A water tank has a glass tube on its side, showing the water level in the tank. What is this surface called? A. Hydraulic grade line B. Piezometric surface C. Potentionmetric surface D. Potential surface |
Piezometric surface |
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Which is applied to electrodes placed in the water of a water storage tank? A. AC current B. DC current C. An electrolytic inhibitor around the Seals where the wires enter the electrodes D. Nothing |
DC current |
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The frequent starting of distribution system pumps probably indicates A. Pump is overheating B. Inadequate supply to pump or check valve leaking back. C. Inadequate distribution storage D. Pump is in need of maintenance |
Inadequate distribution storage |
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Which needs to be determined first when designing a pump station? A. Discharge requirements B. Head requirements C. Power requirements D. Capacity requirements |
Head requirements |
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Which type of joint consists of two machined surfaces? A. Restrained joint B. Push-on joint C. Flanged joint D. Mechanical joint |
Flanged joint |
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Which type of joint requires a movable follower ring? A. Flanged joint B. Grooved joint C. Restrained joint D. Mechanical joint |
Mechanical joint |
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What is the height limit to which siphoned water can be lifted at sea level? A. 22.4 feet B. 32.0 feet C. 33.9 feet D. 34.0 feet |
33.9 feet |
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Which type of impeller is best to use for pumping water with low volumes of solids? A. Closed B. Open C. Semi-open D. Radial |
Closed |
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Which type of pump has the ability to rotate its discharge 360°? A. End suction pump B. Split case pump C. Vertical pump D. Jet pump |
End suction pump |
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How many times higher than normal operating pressure should the pressure rating of distribution system piping be? A. 1.0 to 2.0 times B. 2.5 to 4.0 times C. 4.0 to 5.0 times D. 5.0 to 7.0 times |
2.5 to 4.0 times |
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Which type of pipe has the lowest normal maximum working pressure? A. Reinforced concrete B. Ductile iron C. Polyvinyl chloride D. High-density polyethylene |
Polyvinyl chloride |
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Ductile iron piping using flexible ball joints is most appropriate for A. Low-pressure applications B. High-pressure applications C. For river crossings or rugged terrain. D. Where flexibility is required |
Where flexibility is required |
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Polyvinyl chloride piping using solvent weld joints is most appropriate A. Only for small lines B. For high-pressure applications C. Where flexibility is required D. Where valves or fittings are to be attached |
Only for small lines |
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Which type of pipe joint permits flexible pipe alignment, is inexpensive to manufacture, and is easy to assemble? A. Mechanical joint B. Push-on joint C. Grooved joint D. Ball and socket joint |
Push-on joint |
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New polyvinyl chloride pipe has a C-value of about A. 125 B. 125 to 128 C. 135 D. 150+ |
150+ |
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Which of the following water storage facilities is most likely to contain non-potable water? A. Standpipe B. Buried storage tanks C. Emergency storage tanks D. Elevated tanks using a riser; one way in and one way out |
Emergency storage tanks |
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Which type of valve is used on hydraulic lines connected to valve actuators? A. Pinch valve B. Needle valve C. Pressure-relief valve D. Vacuum-relief valve |
Needle valve |
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Which type of valve is used on hydraulic lines connected to valve actuators? A. Diaphragm valve B. Butterfly valve C. Gate valve D. Pinch valve |
Pinch valve |
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Water meter pits are usually used in A. Areas where flooding will most likely occur B. Areas where flooding is very rare C. Cold climates D. Hot climates |
Cold climates |
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Manufacturers typically design pumps such that the first critical speed is at least _____ higher or lower than rated speed. A. 10% B. 20% C. 25% D. 30% |
20% |
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Which type of pipe requires special external protection in high-chloride soils? A. Reinforced concrete B. Ductile iron C. Steel D. High-density polythylene |
Reinforced concrete |
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Which type of pipe would most likely collapse or become distorted under a partial vacuum? A. Asbestos-cement B. Steel C. Cast iron D. Plastic
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Steel |
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Casing pipe used to house a large water main under a railroad crossing should have a diameter that is __________ larger than the outside diameter of the water main bells. A. Less than 2 inches B. 2 to 8 inches C. 8 to 6 inches D. 6 to 8 inches |
2 to 8 inches |
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Data manipulations using the basic elements f an automated mapping (MS)/Facility mapping (FM)/Geographic Information Systems (GIS) would include A. Collection and storage B. Collection and management C. Modeling and analysis D. Retrieval, display, and storage |
Modeling and analysis |
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Which data category for water utility data sets includes the following map layers: control information, planimetric features, and hydrology features? A. Land records data B. Natural resources data C. Watershed resources data D. Base data |
Base data |
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Which of the following chlorine species is called HTH? A. Hypochlorous acid B. Sodium hypochlorite C. Calcium hypochlorite D. Hypotrichloro-hydrocarbon |
Calcium hypochlorite |
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Which is the proper detention time for disinfecting a water storage tank with water that is mixed with hypochlorite already in the tank such that the free chlorine is 10 mg/L after proper detention time is complete? A. 6 hours B. 8 hours C. 12 hours D. 24 hours |
24 hours |
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The disinfectant residual in treated water entering the distribution system must not be less than A. 0.2 mg/L at anytime B. 0.2 mg/L for more than 4 hours during periods when the system is serving water to the public C. 0.4 mg /L at anytime D. 0.4 mg/L for more than 5% of the time that the system is serving water to the public |
0.2 mg/L for more than 4 hours during periods when the system is serving water to the public |
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The chemical formula for hypochlorous acid is A. OC1-. B. NaOC1. C. HOC1. D. Ca(OC1)² |
HOC1 |
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When following a two step process for disinfecting a water storage tank, the initial dosage of 50 mg/L available chlorine should be held in the partially filled tank for A. At least 6 hours. B. At least 10 hours. C. At least 24 hours. D. At least 3 days. |
At least 6 hours |
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Which type of chlorine gas feeder is most commonly used? A. Pressure B. Combination water and Pressure C. Vacuum D. Combination pressure and vacuum |
Vacuum |
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The minimum cover over a water main below a road in warm climate with no possibility of frost is A. 2.0 feet B. 2.5 feet C. 3.0 feet D. 3.5 feet |
2.5 feet |
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The minimum cover over a water service below a road in a warm climate with no possibility of frost is A. 12 inches B. 18 inches C. 24 inches D. 30 inches |
18 inches |
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Which type of pipe joint is most commonly used for river crossings?A. Ball and socket joint B. Shouldered joint C. Push-on joint D. Expansion joint |
Ball and socket joint |
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Who should be contacted to ensure proper disposal of groundwater from a pipe trenching project? A. US Environmental Protection Agency B. Bureau of Land Management, Water division C. Local regulatory agency D. Local city government or landowner |
Local regulatory agency |
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What is the inlet thread on a standard AWWA corporation stop called? A. Tapered Milwaukee thread B. Minneapolis thread C. Connelly thread D. Mueller thread |
Mueller thread |
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What is the maximum joint deflection for full lengths of standard 48-inch ductile-iron push-joint pipe? A. 3 degrees B. 6 degrees C. 8 degrees D.10 degrees |
3 degrees |
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Large meters are usually tested at which percentage of their operating range? A. 5 to 10% B. 10 to 20% C. 20 to 25% D. 25 to 33% |
5 to 10% |
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Which one of the following types of pipe is most prone to sliding out of a push-on joint if not firmly restrained? A. Asbestos-cement pipe B. Plastic pipe C. Ductile-iron pipe D. Cast-iron pipe |
Plastic pipe |
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Which is the best mechanical compacting equipment for deep narrow trenches? A. Hand-controlled plate tampers B. Vibratory compactors C. Irregular drum tampers D. Boom-mounted plate tampers |
Boom-mounted plate tampers |
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The lantern ring is also known as the A. Packing ring B. Seal cage C. Packing seal D. Mechanical seal |
Seal cage |
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How is the capacity of a centrifugal pump related to total head? A. Directly B. Indirectly C. Linear D. Disproportionately |
Directly |
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The bearings that maintain the radial positioning of a shaft are called A. Radial bearings B. Rolling bearings C. Sleeve bearings D. Thrust bearings |
Radial bearings |
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When the discharge of a velocity pump is blocked, head builds up, typically greater than the pressure generated during pumping. When this occurs, water recirculates within the pump impeller and casing. This flow condition is called A. Run-around B. Skirting C. Slip D. Bypass |
Slip |
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Which valves can be used to throttle flow for only a short period of time? A. Butterfly valve B. Altitude valve C. Self-actuating valve D. Plug valve |
Butterfly valve |
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Which type of valve operates similar to a diaphragm valve? A. Vacuum relief valve B. Globe valve C. Pressure relief valve D. Butterfly valve |
Globe valve |
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Foot valves are a special type of A. relief valve B. Control valve C. Check valve D. Plug valve |
Check valve |
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Which valve can go from fully open to fully closed with 1/4 turn? A. Plug valve B. Needle valve C. Globe valve D. Pinch valve |
Plug valve |
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Usually, which type of hydrant is a flush hydrant? A. Warm-climate hydrant B. Wet-barrell hydrant C. Dry-barrell hydrant D. Standpipe-barrell hydrant |
Dry-barrell hydrant |
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Which type of temperature sensor uses two wires of different materials? A. Thermistors B. Thermo-resistors C. Thermocouples D. Thermo-conductors |
Thermocouples |
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Which type of temperature sensor uses a semi-conductive material? A. Thermistors B. Thermo-resistors C. Thermocouples D. Thermo-conductors |
Thermo-conductors |
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The amount of energy in feet that a pump supplies to a fluid is called A. Velocity head B. Pump head C. Total head D. Pressure head |
Pump head |
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Which is the most frequent cause of hydraulic transients in water distribution systems? A. Controlled pump shutdown B. Flow demand changes C. Pump startup D. Valve opening and closing |
Valve opening and closing |
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Which type of valve should be used for filling an elevated tank if full system pressure would overflow the tank? A. Pressure-relief valve B. Altitude valve C. Pressure-reducing valve D. Globe valve |
Altitude valve |
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One form of a differential-pressure flow meter is a(n) A. Propeller B. Proportional C. Velocity-type D. Orifice plate |
Orifice plate |
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If a centrifugal pump with a single volute is operated at more than _________ of its design capacity, an excess radial load will result, causing premature bearing failure A. 110% B. 120% C. 125% D. 135% |
120% |
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How many inches of mercury is a total vacuum at sea level? A. 14.7 inches B. 30.0 inches C. 34.0 inches D. 39.6 inches |
30.0 inches |
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How many feet of water will equal the atmospheric pressure at sea level? A. 28 feet B. 30 feet C. 32 feet D. 34 feet |
34 feet |
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Pressure gauges connected to both suction and discharge sides of a pump should be connected A. 2 to 3 feet on either side of a pump, unless there is a change in direction it can go closer B. 1 foot and 2 feet from the pump on the suction side and discharge side, respectively C. Next to the pump on the suction side and just before the check valve on the discharge valve D. To the pressure taps supplied on the pump |
To the pressure taps supplied on the pump |
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Which are the principle types of throttling valves? A. Throttling and pressure-reducing valves B. Butterfly and relief valves C. Butterfly and altitude valves D. Pressure-reducing and altitude valves |
Pressure-reducing and altitude valves |
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Which valve would be best to use to precisely throttle flow? A. Globe valve B. Butterfly valve C. Rotary valve D. Needle valve |
Needle valve |
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SCADA systems consist of the following distinct components A. Remote terminal units (RTUs), communications, and human machine interface (HMI) B. Sensitive instrument, RTUs, communications, and HMI C. Sensing instrument, RTUs, communications, master station, and HMI D. RTUs, communications, master station, and HMI |
RTUs, communications, master station, and HMI |
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Stray-current corrosion is caused by A. Corrosive soils B. Acidic soils C. AC currents D. DC currents |
DC currents |
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When a metal is galvanized, it is coated with A. Zinc B. Aluminum C. Aluminum oxide D. Aluminum hydroxide |
Zinc |
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Which system would provide for a "soft start" to a motor? A. Wound-rotor induction motor and controller B. Synchronous motor and a variable frequency controller C. A variable frequency drive and squirrel-cage induction motor D. Squirrel-cage induction drive and a variable frequency drive |
Wound-rotor induction motor and controller |
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Which type of relay is frequently used to detect power loss and initiate a switchover to another power source? A. Loss-of-phase relays B. Voltage relays C. Frequency relays D. Circuit breaker relays |
Voltage relays |
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Which type of relays are placed on each phase of power supply to open up a control circuit and stop a motor, if the current becomes excessive? A. Thermal-overload relays B. Frequency relays C. Voltage relays D. Differential relays |
Thermal-overload relays |
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Which type of relay is often used where local power generation is involved and on synchronous motor starters to sense when the motor has reached synchronizing speed? A. Speed sensor relay B. Differential relay C. Frequency relay D. Voltage relay |
Frequency relay |
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Whichtype of relay is frequently used on equipment to check whether all the current entering a system comes back out of the system?A. Voltage relay B. Over-current relay C. Reverse-current relay D. Differential relay |
Differential relay |
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Which is the correct sequence of telemetry signal? A. Indicator, sensor, transmission channel, receiver, transmitter, and signal B. Sensor, transmitter, transmission channel, receiver, and Indicator C. Signal, Indicator, transmitter, transmission channel, receiver, and sensor D. Signal, sensor, transmission channel, transmitter, receiver, and Indicator |
Sensor, transmitter, transmission channel, receiver, and Indicator |
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Which type of instrument is used to measure the average power of a load over a specific time interval? A. Demand meter B. Voltmeter C. Ammeter D. Wattmeter |
Voltmeter |
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Sacrificial anodes are also called A. Corrosion anodes B. Corrosion cells C. Galvanic anodes D. Decaying anodes |
Galvanic anodes |
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Which is becoming the most common, and is one of the least dangerous, methods of thawing a water service line? A. Hot water B. Electrical C. Small torch D. Steam vibration |
Hot water |
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When a control switch operated by pressure change is located too close to a pump station erratic operation can occur. This problem is known as A. Pulsing B. Seesaw arching C. Racking D. Roaming |
Racking |
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Which is the electronic standard range? A. 4 to 20 mA DC B. 4 to 20 mA AC C. 0 to 100% D. 0 to 1 binary |
4 to 20 mA DC |
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Which is the chemical makeup of a tubercle? A. Mn(OH)2 on the inside and Ca(HCO3)2 on the outside B. Mn(OH)2 on the outside and Ca(HCO3)2 on the inside C. Fe(OH)2 on the inside and Fe(OH3) on the outside D. Fe(OH)2 on the outside and Fe(OH)3 on the inside |
Fe(OH)2 on the inside and Fe(OH3) on the outside |
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Which device consists of a pair of metallic plates that are separated by an insulating material called a dielectric? A. Storage battery B. Voltage regulator C. Rectifier D. Capacitor |
Capacitor |
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The current rating of a fuse should be _______ the current rating of the circuit or device that it protects. A. Slightly lower than B. 15% greater than C. Equal to D. Equal to or Slightly larger than |
Equal to or slightly larger than |
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Conductors usually fail because of A. Excessive heat B. Mechanical failure C. Lightening D. Simple aging |
Mechanical failure |
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Inspection of the shaft and coupling alignment should be performed every _______ or immediately, if problem signs develop. A. Month B. Quarter C. 6 months D. Year |
6 months |
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Bearings should not be lubricated with this type of oil because this oil forms acids as it begins to break down. A. Non-detergent mineral oil B. Animal oil C. SAE 10 D. SAE 20 |
Animal oil |
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How much resistance should motor-winding insulation exhibit? A. At least 0.5 megohm of resistance B. At least 1.0 megohm of resistance C. At least 2.0 megohm of resistance D. A least 5.0 megohm of resistance |
At least 5.0 megohm of resistance |
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Which is the pneumatic standard range? A. 0 to 10 psig B. 3 to 15 psig C. 4 to 20 psig D. 0 to 100% |
3 to 15 psig |
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Which of the following methods for preventing external corrosion is only a short term remedy? A. Extra thickness for pipe walls B. Wrapping pipe in polyethylene plastic sleeves C. Applying a coating of bitumastic or coal tar D. Installing cathodic protection in the pipe |
Extra thickness for pipe walls |
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The D'Arsonval meter is A. An amperometric meter B. A type of pH meter C. An analog (uses a needle) meter D. A digital (number displays on unit) meter |
An analog (uses a needle) meter |
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How does H2S gas kill a person? A. Asphyxiation B. Paralyzes the respiratory system C. Paralyze the nervous system D. Stops the heart |
Paralyzes the respiratory system |
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If sodium hypochlorite comes in contact with the skin, it should be immediately flushed with water for at least A. 10 minutes B. 15 minutes C. 20 minutes D. 30 minutes |
15 minutes |
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Which is the secondry maximum contaminant level for pH? A. 7.0 pH units B. 6.5 to 7.5 pH units C. 6.5 to 8.5 pH units D. 6.0 to 8.5 pH units |
6.5 to 8.5 pH units |
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If an excavation on a road requires that one of the lanes be closed and the speed limit is 25 mph, how many cones are required to divert the traffic? A. 6 B. 9 C. 13 D. 15 |
6 |
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If an excavation on a road requires that one of the lanes be closed and the speed limit is 45mph, how many cones are required to divert the traffic? A. 9 B. 13 C. 15 D. 18 |
13 |
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Which chemical may cause leaching in stagnant waters? A. sodium zinc phosphate B. Lime C. Sodium carbonate D. Sodium hydroxide |
Sodium zinc phosphate |
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During simulated distribution testing, a borate buffer solution maintains a constant pH of A. 10 B. 8 C. 7 D. 5 |
8 |
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In permit-entry confined space, who is responsible for terminating entries? A. Authorized entrant B. Standby attendant C. Entry supervisor D. Entry supervisor and the standby attendant |
Entry supervisor |
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In permit-entry confined space, who is responsible for summoning rescuers? A. Standby attendant and authorized attendant B. Entry supervisor and authorized attendant C. Authorized attendant D. Authorized entrant |
Authorized attendant |
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Extremely small chlorine leaks that go for weeks will most likely be found A. By using a very strong ammonia solution B. By using soap and looking for bubbles C. By using your nose D. By seeing discoloration and moisture at the leak point |
By seeing discoloration and moisture at the leak point |
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Which is the action level for lead? A. 0.015 mg/L B. 0.020 mg/L C. 0.025 mg/L D. 0.040 mg/L |
0.015 mg/L |
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Most regulated contaminants A. Are thought to cause liver or kidney damage B. Can cause heart or cardiovascular disease C. Cause health effects only after long exposure D. Cause acute effects |
Cause health effects only after long exposure |
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High levels of cadmium at the customer's tap would most likely be due to A. Copper pipe B. Galvanized pipe C. Iron pipe D. Household fixtures |
Galvanized pipe |
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Which is the secondary containment level for zinc? A. 1 mg/L B. 2 mg/L C. 5 mg/L D. 10 mg/L |
5 mg/L |
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The prevention of trench cave-ins using the sloping method requires which slope ratio? (Note: horizontal to vertical distance, respectively) A. 1.0 : 1.0 B. 1.5 : 1.0 C. 2.0 : 1.0 D. The angle will vary with type of soil moisture content, and surrounding conditions |
The angle will vary with type of soil moisture content, and surrounding conditions |
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What is the maximum contaminant level or asbestos fibers greater than 10 micrometers? A. 1 million fibers per liter (MFL) B. 2.5 MFL C. 5.0 MFL D. 7.0 MFL |
7.0 MFL |
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Which is the locational running annual average (LRAA) or trihalomethanes (THM) and haloacetic acid 5 (HAA5) under the stage 2 disinfectants/disinfection by-products rule? A. 80/60 ug/L B. 100/75 ug/L C. 100/80 ug/L D. 120/100 ug/L |
80/60 ug/L |
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Under the surface water treatment rule, undetected disinfection residuals must not exceed what percentage of samples each month for any two consecutive months that water is served to the public? A. Zero tolerance B. 1% C. 2% D. 5% |
5% |
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Which would be the most probable solution if actinomycetes were causing taste and odor problems in the distribution system? A. Use copper sulfate and flush the system B. Start using chloramines as a disinfectant since it has a longer lasting residual compared to chlorine C. Use activated carbon and flush the system D. Control nutrients |
Use activated carbon and flush the system |
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Where is scale most likely to form in a hypochlorinator? A. Push rod B. Plunger C. Pump head D. Spring |
Pump head |
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Which type of chlorine gas feeding equipment would be most appropriate for distribution system's where rechlorination is required? A. Compound-loop control gas feeder B. Automatic proportioning control gas feeder C. Automatic residual control gas feeder D. Semiautomatic control gas feeder |
Compound-loop control gas feeder |
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When a sample is collected, it's quality begins to change because of A. Dissolved gases B. Chemical activity C. pH D. Alkalinity
|
Chemical activity |
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Chemolithotrophic nitrifying bacteria are A. Gram-negative and anaerobic B. Gram-positive and strictly aerobic C. Gram-negative and facultative or aerobic D. Gram-negative and strictly aerobic |
Gram-negative and strictly aerobic |
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Which index will indicate scale-forming water with values less than 6 and corrosive water with values greater than 7? A. Baylis curve B. Langelier saturation index C. Marble test D. Ryzner index |
Ryzner index |
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The radiation term corresponding to an energy absorption of 100 eggs per gram of any medium is called a(n) A. Rad B. Rem C. Curie D. Erg |
Rad |
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Community and non-transient community water systems must test for ________ if they use ozone for disinfection or oxidation A. Chlorate B. Bromate C. Haloacetic acids (five) D. Total trihalomethanes |
Bromate |
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According to AWWA Standard C652 Method 3, disinfection of water tanks requires exposure to free chlorine at a concentration of ________ for 24-hours with the free chlorine residual ending at a concentration of at least ________. A. 10 mg/L; 2 mg/L B. 25 mg/L; 10 mg/L C. 50 mg/L; 10 mg/L D. 100 mg/L; 25 mg/L |
10 mg/L; 2 mg/L |
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If a main cannot be installed at an adequate depth in a cold weather climate, Styrofoam insulation board can be used to protect the water in the pipe from freezing. How far above the pipe should the insulation be installed? A. 2 to 4 inches B. 5 to 7 inches C. 8 to 10 inches D. 1 foot |
2 to 4 inches |
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How much deeper below the grade line of a pipe bottom should a trench be excavated if is being dug in rock formation? A. 3 to 6 inches B. 6 to 9 inches C. 9 to 12 inches D. 12 to 18 inches |
6 to 9 inches |
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Pressure-relief valves are most similar to A. Globe valves B. Vacuum relief valves C. Needle valves D. Check valves |
Globe valves |
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Current meters are primarily used for measuring flow in lines that are A. 5/8 to 1 inch B. 1 to 3 inches C. 3 inches or greater D. 12 inches or greater |
3 inches or greater |
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Which does beam breakage resemble? A. Shear breakage B. Stress breakage C. Flexural breakage D. Tensile breakage |
Shear breakage |
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Which type of valve should be installed for pressure control and flow control in large pipes? A. Butterfly valve B. Globe valve C. Gate valve D. Ball valve |
Globe valve |
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Which can be developed by measuring the pressure along a pipeline? A. The C factor B. The total dynamic head C. The pipeline's grade D. The hydraulic grade |
The hydraulic grade |
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A thrust block would not be required on pipes that are A. Made of steel B. Made of reinforced concrete C. Welded at the joints D. Of the bell and socket type |
Welded at the joints |
|
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Which is the recommended water pressure in commercial districts? A. 50 to less than 65 psi B. 55 to less than 75 psi C. 75 to less than 100 psi D. 90 to less than 120 psi |
75 to less than 100 psi |
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Which can be used to avoid excessively high water pressures in distribution mains? A. Pressure-reducing valves B. Plug valves C. Installation of a pneumatic tank D. Blowoff valves |
Pressure-reducing valves |
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Which is the commonly accepted water velocity in water mains at maximum flows? A. 1 to 3 ft/sec B. 2 to 4 ft/sec C. 4 to 5 ft/sec D. 5 to 6 ft/sec |
2 to 4 ft/sec |
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It is recommended the dead-water mains more than 1,000 feet in length should be constructed of pipe that is at least _____ in diameter A. 6 inches B. 8 inches C. 10 inches D. 12 inches |
6 inches |
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The size and capacity of a water distribution system is based largely on A. Peak hour customer demands B. Fire demand C. Agricultural demand D. Industrial demand |
Fire demand |
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A water storage tank located far from the source of demand would most likely have which type of problem during peak demand, if the area between storage and use is relatively flat? A. Low flow due to friction losses B. Poor water quality due to transmission pipe being too long C. High pumping costs during peak hourly flow D. Low pressure |
Low pressure |
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Which type of pipe material is prestressed? A. Steel cylinder B ductile iron C. Asbestos-cement D. C-900 PVC |
Steel cylinder |
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Which type of service pipe material is no longer acceptable for drinking water? A. Brass B. Lead C. Galvanized wrought iron D. Copper |
Lead |
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Which type of joint for connecting water pipes has the advantage of moderate deflection and the gaskets used absorb vibration and pipe movement? A. Flanged joint B. Victaulic joint C. Dressler coupling D. Restrained joint |
Dressler coupling |
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Which type of joint for connecting water pipes is used where the available space to lock a joint in place is lacking and where the soil behind the fitting may be disturbed? A. Flanged joint B. Victaulic joint C. Dressler coupling D. Restrained joint |
Restrained joint |
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Which is normally used on the outside joint space of steel cylinder concrete in order to protect the joint rings from external corrosion? A. Bituminous material B. Epoxy material C. Mastic coating D. Cement mortar |
Cement mortar |
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|
How much deflection is allowed for asbestos-cement couplings that are 3 to 12 inches in diameter? A. 5 degrees B. 7 degrees C. 10 degrees D. 12 degrees |
5 degrees |
|
|
Which is the best or first choice corrosion control method(s) to protect pipe? A. Use of noncorrosive metals and/or mechanical coatings B. Chemical protective coatings C. Electrical control by using cathodic protection D. Use of metallic coating such as zinc or aluminum |
Use of noncorrosive metals and/or mechanical coatings |
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|
What is an effective way for distribution system agency to measure financial stability? A. Measuring the debt B. Calculating the operating and coverage ratios C. By dividing the paying customers y the total customers, then multiplying by 100%; anything over 95% s excellent D. Simply by how much money in the black that they have each fiscal year |
Calculating the operating and coverage ratios |
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|
Where do good public relations start for a water utility? A. With well-maintained fire hydrants B. With meaningful advertising C. Via public relations campaigns D. Through dedicated service-oriented employees |
Through dedicated service-oriented employees |
|
|
One of the most important functions and the major part of the work day for a manager of a water utility or distribution system is involved in A. Organizing B. Planning C. Directing D. Controlling |
Planning |
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|
Which term defines lead free, when used with the respect to solders and Flux? A. Containing not more than 0.01% lead B. Containing not more than 0.02% lead C. Containing not more than 0.04% lead D. Containing not more than 0.05% lead |
Containing not more than 0.02% lead |
|
|
Which defines lead free when used with respect to pipes and pipe fittings? A. Containing not more than 3% lead B. Containing not more than 6% lead C. Containing not more than 8% lead D. Containing not more than 9% lead |
Containing not more than 8% lead |
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|
If a water system collects less than 40 samples per month for the analysis of total coliforms, how many samples can be total coliform positive and the system still remain n compliance with the maximum contaminant level for total coliforms? A. zero B. 1 C. 2 D. 3 |
1 |
|
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Which is the maximum holding time for fecal coliforms using the fecal coliform procedure? A. 8 hours B. 12 hours C. 24 hours D. 36 hours |
8 hours |
|
|
The peak historical month for a ground water system is the month with the highest total trihalomethanes or haloacetic acid (five) levels or the month with the A. Warmest water temperature B. Lowest pH C. Lowest alkalinity D. Highest alkalinity |
Warmest water temperature |
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|
A water system doing a system specific study plan may use the results of samples collected and analyzed or total trihalomethanes and haloacetic acids (five), if the samples were collected within _______ before the study plan submission date. A. 1 year B. 2 years C. 3 years D. 5 years |
5 years |
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|
A water system is eligible to be certified 40/30, if it had no samples that exceed 0.040 mg/L for total trihalomethanes and no samples that exceed 0.030 mg/L for haloacetic acids (five). How many consecutive quarters must a water system be below these numbers to be 40/30 certified? A. 6 quarters B. 8 quarters C. 10 quarters D. 12 quarters |
8 quarters |
|
|
If a water system is required to conduct quarterly monitoring less frequently then quarterly under the Stage 2 Disinfection By-products Requirements they must begin monitoring in the calendar month A. Beginning in January 2012 B. Recommended in the Initial Distribution System Evaluation (IDSE) report. C. That includes the compliance date D. That follows the quarter that includes the compliance date |
Recommended in the Initial Distribution System Evaluation (IDSE) report. |
|
|
A water system that is required to sample quarterly must make compliance calculations at the end of the A. First qaurter B. Fourth quarter C. Sixth quarter D. Eighth quarter |
Fourth quarter |
|
|
All water systems under the Stage 2 Disinfection By- products Requirements must monitor during the month with the highest A. Disinfection by-products B. Total organic carbon C. Organic acids D. Temperature and lowest pH |
Disinfection by-products |
|
|
A water system monitoring total trihalomethanes and haloacetic acids (five) quarterly must report the number of samples collected, date, and results of each sample during the last quarter. When must this report be submitted to the state? A. Within 5 days after quarter ends B. Within 10 days after quarter ends C. Within 14 days after quarter ends D. Within 30 days after quarter ends |
Within 10 days after quarter ends |
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|
How are samples for lead and copper analysis collected from services that have a lead service line? A. First draw samples that have remained motionless for at least 2 hours B. First draw samples that have remained motionless for at least 4 hours C. First flush the volume of water between tap and lead service line, then collect the sample D. Flush two volumes calculated between tap to end of lead service line, then collect the sample |
First flush the volume of water between tap and lead service line, then collect the sample |
|
|
When can a water system that meets the lead and copper action levels for two consecutive six-month periods, reduce the number of samples and reduce the frequency of sampling at the same time such that they only sample very 3 years? A. When the 90th percentiles or lead and copper are 0.003 mg/L and 0.50 mg/L, respectively B. When the 90th percentiles or lead and copper are 0.004 mg/L and 0.60 mg/L respectively C. When the 90th percentiles for lead and copper are 0.005 mg/L and 0.65 mg/L respectively D. When the 90th percentiles for lead and copper are 0.007 mg/L and 0.70 mg/L respectively |
When the 90th percentiles for lead and copper are 0.005 mg/L and 0.65 mg/L respectively |
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|
Water systems that are sampling for lead and copper and qualify for a reduction in the number and frequency of sampling, unless the State has approved a different sampling period, shall conduct lead and copper sampling A. During October, November, December, and January B. During June, July, August, and September C. In the months January, April, July, and October D. Alternate months, collecting 6 sets of samples |
During June, July, August, and September |
|
|
When a water system is required to monitor water quality parameters because it exceeded the lead and copper action level, which parameter must be measured every two weeks at each entry point to the distribution system? A. Alkalinity B. Disinfection residual C. pH D. Orthophosphate |
pH |
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|
Each day following a routine sample monitoring result that exceeds the maximum residual disinfectant level for chlorine dioxide, the water system must collect from the distribution system______ samples for analysis of chlorine dioxide. A. 2 B. 3 C. 4 D. 5 |
3 |
|
|
If a water system monitors for total trihalomethanes (TTHM) and the sum of five haloacetic acids (HAA5), then on a quarterly basis the system must report A. The mean of both TTHM and HAA5 results each quarter B. The highest value for both TTHM and HAA5 for each quarter C. The arithmetic average of all samples for TTHM and HAA5 D. A running annual average for TTHM and HAA5 once four quarters of data have been collected |
The arithmetic average of all samples for TTHM and HAA5 |
|
|
How should a distribution operator preserve a sample to be analyzed for nitrate-nitrite? A. Preserve with HNO³ B. Preserve with NaOH C. Preserve with H²SO⁴ D. Preserve be keeping it at 4°C |
Preserve with H²SO⁴ |
|
|
How should a distribution operator preserve a sample to be analyzed for asbestos? A. Preserve with HNO³ B. Preserve with NaOH C. Preserve with H²SO⁴ D. Preserve be keeping it at 4°C |
Preserve be keeping it at 4°C |
|
|
Which is the sample size for lead and copper analyses? A. 100 mL B. 250 mL C. 500 mL D. 1,000 mL |
1,000 mL |
|
|
Which method can be used to control scaling but is never used to control corrosion? A. Controlled CaCO³ scaling B. Polyphosphate addition C. pH and alkalinity adjustment with lime D. Sequestering |
Sequestering |
|
|
Samples collected for lead and copper analyses by customers need to avoid problems of residents handling an acid that would otherwise be contained in sample bottles. Thus the samples must be later acidified to A. Preserve the sample B. Resolubilize the metals C. Free the lead and copper from possible reactions with other metals in the sample bottles D. Free the lead and copper from sodium that may be in the water |
Resolubilize the metals |
|
|
Water systems are required to monitor for certain water quality parameters when they exceed the lead and copper action levels. If these systems maintain the range of values for the water quality parameters that reflect optimal corrosion control treatment during each of two consecutive six-month monitoring periods, then although they must still monitor at the entry point(s) to the distribution system, they are allowed to A. Reduce the number of sites sampled B. Reduce the frequency of sampling from 6-month periods o annually C. Eliminate all water quality parameters monitored, except pH and alkalinity D. Eliminate all water quality parameters monitored, except pH and they must record in mg/L the dosage for any chemical alkalinity adjustment |
Reduce the number of sites sampled |
|
|
If the continous monitoring of the residual disinfectant concentration for water entering the distribution system fails, how often must grad samples be collected in lieu of continuous monitoring until the problem is repaired? A. Every hour B. Every 4 hours C. Every 8 hours D. Every 12 hours |
Every 4 hours |
|
|
At which time of day is the age water stored in the distribution system the lowest A. Early morning B. Late morning C. Early afternoon D. Late evening |
Late evening |
|
|
Which type of maps should not overlap each other? A index maps B. Comprehensive maps C. Construction maps D. Sectional maps |
Sectional maps |
|
|
Which one of the following should a type of joint for ductile iron piping? A. welded joint B. Expansion joint C. Flexible ball joint D. Bell and spigot with rubber o-ring |
Flexible ball joint |
|
|
The amount of energy in feet required to overcome resistance to flow in a pipe is called A. pump head B. Cutoff head C. Pressure head D. Friction head |
Friction head |
|
|
The fire insurance underwriters recommend that no main should have a diameter less than |
6 inches |
|
|
Water velocities through pipe should b limited to 5 ft/sec in order to A. Minimize friction loss B. Reduce the number of pressure reducing stations C. Minimize destruction of piping appurtenances D. Reduce the amount of corrosion inhibitors applied to piping |
Minimize friction loss |
|
|
Which one of the following is a type of ductile iron piping? A. welded joint B. Restrained joint C. Expansion joint D. Rubber gasket joint |
Restrained joint |
|
|
Minor head losses are caused by A. Slime growths and corrosion or scaling B. Corrosion and tuberculation C. Type of pipe material and "C" factor D. Sudden changes in direction or velocity of flow |
Sudden changes in direction or velocity of flow |
|
|
The most desirable residential pressure ranges from A. 20 to 35 psi B. 35 to 50 psi C. 50 to 75 psi D. 75 to 90 psi |
50 to 75 psi |
|
|
Which is pipe strength expressed in? A. Hydrostatic potential B. Psi and durability C. Tensile and flextural strength D. Baud units |
Tensile and flextural strength |
|
|
The resistance of a material to longitudinal pulling forces before it breaks is called A. Flexural strength B. Shear strength C. Ductile strength D. Tensile strength |
Tensile strength |
|
|
Most water systems use hydrants with two nozzles with diameters of ______ and one nozzle with a diameter of A. 2.0; 3.0 inches B. 2.0; 4.0 inches C. 2.5; 3.5 inches D. 2.5; 4.5 inches |
2.5; 4.5 inches |
|
|
Which type of pipe is durable and strong, has high flexural strength and good corrosion resistance, and is easily tapped? A. High-density polyethylene B. Steel C. Ductile iron D. Reinforced concrete |
Ductile iron |
|
|
Which of the following is a pipe joint for steel piping? A. Flexible ball joint B. Restrained gasket joint C. Expansion joint D. Push-on joint |
Expansion joint |
|
|
Which of the following is a type of joint for steel piping? A. Flexible ball joint B. Rubber gasket joint C. Restrained joint D. Galvanized steel ring |
Rubber gasket joint |
|
|
Which is plotted on the horizontal scale (x-axis) of pump curve? A. Efficiency B. Capacity (flow rate) C. Total head D. Power |
Capacity (flow rate) |
|
|
Hydraulics is the study of A. Fluid pressure in pipes or conduits B. The force of fluids in motion C. The pressure of fluids in motion D. Fluids in motion and at rest |
Fluids in motion and at rest |
|
|
How many feet of water will equal the atmospheric pressure at sea level? A. 28 feet B. 30 feet C. 32 feet D. 34 feet |
34 feet |
|
|
Which type of pipe has the highest normal maximum working pressure? A. Reinforced concrete B. Ductile iron C. Polyvinyl chloride D. High-density polyethylene |
Ductile iron |
|
|
Concrete piping using bell and spigot type joints is appropriate A. For all locations B. Where expansion or contraction will occur C. Under low-pressure applications D. Under high-pressure applications |
For all locations |
|
|
Regarding fire flow, mains smaller than 6 inches shold be used A. In residential areas B. In low-value districts C. In rural areas D. To complete a grid |
To complete a grid |
|
|
Which is the proper detention time for disinfecting a water storage tank that is filled with already chlorinated water such that the free chlorine residual is 10 mg/L after the proper detention time is completed? A. 4 hours B. 6 hours C. 8 hours D. 24 hours |
6 hours |
|
|
Usually the best disinfectant to use in large-diameter pipes or very long pipelines is A. Calcium hypochlorite B. Sodium hypochlorite C. Chlorine gas D. Chloramines |
Chlorine gas |
|
|
Which method for controlling nitrification problems in a distribution system would result in a temporary increase in trihalomethanes? A. Increasing the chlorine to nitrogen weight ratio B. Superchlorinating reservoirs and storage tanks C. Decreasing chlorine detention time in reservoirs and distribution pipelines D. Flushing the distribution pipelines |
Superchlorinating reservoirs and storage tanks |
|
|
Which is the available chlorine concentration used for disinfecting a water storage tank using a method that involves spraying or painting of all the interior tank surfaces? A. 50 mg/L B. 100 mg/L C. 200 mg/L D. 250 mg/L |
200 mg/L |
|
|
Why are altitude valves used on water storage tanks? A. To allow water to pass in and out of the tank as pressure fluctuates B. To stop the flow of water into the tank when it is full C. To allow overflow water to flow out of the tank D. To shut the flow of water to the tank off for maintenance and inspection |
To stop the flow of water into the tank when it is full |
|
|
A small water system has met certain criteria and has been granted a waiver and thus a reduced frequency for monitoring lead and copper. How often with this waiver does it have to monitor? A. Once every 5 years B. Once every 9 years C. Once every 10 years D. Once every 12 years |
Once every 9 years |
|
|
Which is the bolt torque for mechanical-joint on a standard 48-inch ductile-iron water main? A. 45 to 60 ft-lb B. 120 to 150 ft-lb C. 225 to 250 ft-lb D. 275 to 325 ft-lb |
120 to 150 ft-lb |
|
|
Which type of pipe joint has machine ends? A. Restrained joint B. Flanged joint C. Mechanical joint D. Shouldered joint |
Shouldered joint |
|
|
Why Is it so important to monitor the speed of a variable-speed pump? A. To prevent excessive temperatures from developing B. To prevent vibration from developing C. To prevent speed oscillation from occurring D. To prevent cavitation from occurring |
To prevent cavitation from occurring |
|
|
Which basic electrical unit is used to measure a material's opposition to the flow of electricity? A. Amprere B. Ohm C. Volts D. Resistance or impedance |
Ohm |
|
|
The first oil change on a new pump should be done A. After the first two weeks of operation B. After one month of operation C. After three months of operation D. After six months of operation |
After one month of operation |
|
|
How often should the temperature of centrifugal pump motor bearings be checked with a thermometer? A. Every day B. Once a week C. Twice a month D. Once a month |
Once a month |
|
|
All sensors that respond to liquid pressure will perform poorly if _______ enter(s) the sensor A. Air B. Corrosive chemicals from water treatment processes C. Corrosive chemicals from piping D. Iron bacteria |
Air |
|
|
Packing replacement is usually performed when A. Water leakage sprays out of the pump housing B. No further tightening can be done on the packing gland C. The packing gland bolts are exposed by more than 2 ¹/2 inches above the nut D. The packing has completely disintegrated |
No further tightening can be done on the packing gland |
|
|
Which device changes alternating current by allowing the electric current to flow in one direction but blocking flow in the opposite direction? A. Regulator B. Convertor C. Inverter D. Rectifier |
Rectifier |
|
|
To ease installation of impeller wear rings, they can be A. Lubricated with a light oil B. Greased with lithium C. Heated D. Cooled |
Heated |
|
|
Packing is designed to A. Add lubricant to the shaft B. Expand and deteriorate with normal use C. Protect the shaft D. Wear and deteriorate with normal use |
Wear and deteriorate with normal use |
|
|
Insulators usually fail because of A. Abnormally high voltages B. Excessive heat C. Switching surges D. Mechanical failure |
Excessive heat |
|
|
Although some phase imbalance will occur in any system, in general, it should not exceed A. 5% B. 10% C. 15% D. 20% |
10% |
|
|
Nitrification in the distribution system can best be described as the A. Breakdown of ammonia by certain bacteria B. Utilization of nitrogen in ammonia by certain bacteria C. Oxidation of ammonia to nitrites then to nitrates D. Reduction of ammonia to nitrites to nitrates |
Oxidation of ammonia to nitrites then to nitrates |
|
|
Which type of rigid coupling is easy to install and remove? A. Split coupling B. Jaw coupling C. Gear coupling D. Flexible disc coupling |
Split coupling |
|
|
Which is the correct equation for Ohm's law? A. Volts =(amps)(ohms) B. Ohms = (volts)(amps) C. Ohms = amps/volts D. Amps = (volts)(ohms) |
Volts =(amps)(ohms) |
|
|
Which are the basic components of every telemetry system? A. Transmitter, signal, receiver, and indicator B. Transmitter, receiver, and indicator C. Transmitter, transmission channel, and receiver D. Sensor, Transmitter, transmission Chanel, and receiver |
Transmitter, transmission channel, and receiver |
|
|
The anodes placed in a water storage tank for cathodic protection usually last _______, and should be inspected every __________. A. 10 years; 6 months B. 10 years; year C. 15 years; 6 months D. 20 years; year |
10 years; year |
|
|
In general, the current drawn by a motor the instant it is connected to the power source, called the locked-motor current, is usually ________ times the normal full-load current of a motor. A. 1.5 to 2.0 B. 2.0 to 3.0 C. 3.0 to 5.0 D. 5.0 to 10.0 |
5.0 to 10.0 |
|
|
Most telemetry equipment transmit information by A. Digital signals B. Analog signals C. Audio signals D. Electrical pulses |
Digital signals |
|
|
Control systems consist of the following distinct components A. Signal conditioners and control elements B. Signal conditioners, actuators, and control elements C. Signal conditioners, actuators, control elements, and indicators D. Sensors, Signal conditioners, actuators, control elements, and indicators |
Signal conditioners, actuators, and control elements |
|
|
Which agency sets legal limits on the concentration levels of harmful contaminants in potable water distributed to customers? A. Nation Primary Water Regulations B. United States Environmental Protection Agency C. United States Public Health Service D. Occupational Health and Safety Organization |
United States Environmental Protection Agency |
|
|
Which violations are most serious? A. Tier I B. Tier II C. Tier III D. Tier IV |
Tier I |
|
|
A positive fecal coliform test must be reported to primacy agency within A. 8 hours B. 12 hours C. 24 hours D. 48 hours |
8 hours |
|
|
The number of monthly distribution system bacteriological samples required is A. Based on water withdrawal permit limit B. Based on system size C. Based on population served D. Different for each state |
Different for each state |
|
|
Which is the approximate angle of repose for average soils when using the sloping method for the prevention of cave-ins? (Note: horizontal to vertical distance, respectively) A. 0.5 : 1.0 B. 1.0 : 1.0 C. 1.5 : 1.0 D. 2.0 : 1.0 |
2.0 : 1.0 |
|
|
Which is the Maximum Contaminant Level for total trihalomethanes (TTHMs)? A. 0.040 mg/L B. 0.060 mg/L C. 0.080 mg/L D. 0.100 mg/L |
0.080 mg/L |
|
|
A system fails to collect water samples in their distribution system would fall under which public notification requirement? A. Tier I B. Tier II C. Tier III D. Tier IV |
Tier II |
|
|
Under the Surface Water Treatment Rule, disinfection residuals must be collected at the same location in the distribution system as A. Coliform samples B. Total trihalomethanes C. Disinfection by-products D. Alkalinity, conductivity, and pH for corrosion studies |
Coliform samples |
|
|
Iron can cause "red water" and thus customer complaints when it's concentration is above its secondary maximum contaminant level of A. 0.01 mg/L B. 0.05 mg/L C. 0.10 mg/L D. 0.30 mg/L |
0.30 mg/L |
|
|
Which chemical may encourage the growth of algae and microorganisms? A. Lime B. Sodium bicarbonate C. Sodium hydroxide D. Zinc orthophosphate |
Zinc orthophosphate |
|
|
Water systems that collect samples for coliform testing must not find more than _______ percentage of the samples they collect each month to be coliform positive. A. 2% B. 4% C. 5% D. 10% |
5% |
|
|
Which is the Maximum Contaminant Level for nitrate measured as nitrogen? A. 1.0 mg/L B. 2.0 mg/L C. 5.0 mg/L D. 10.0 mg/L |
10.0 mg/L |
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Cohesive soil would contain a lot of A. Water B. Clay C. Clay and silt D. Clay, silt, and sand |
Clay |
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Who should inspect the work of a water storage painting contractor? A. The water utility supervisor B. A water operator or operators responsible for the area the tank is located in C. At least two competing painting contractors D. A qualified third party |
A qualified third party |
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Aviation warning lights on water storage tanks have an FAA regulation that requires the bulbs to be replaced before they reach what percentage of their normal life expectancy? A. 50% B. 60% C. 75% D. 80% |
75% |
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The most expensive part of a pipe installation is/are the A. Pipe fittings B. Valves C. Excavation D. Engineer's design |
Excavation |
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Which of the following is potential biological biotoxin threat? A. Sarin B. Ricin C. Taban D. 3-quinucli dinyl benzilate
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Ricin |
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The IDLH (Immediately Dangerous to Life and Health) value for chlorine, set by the National Institution of Occupational Safety And Health, is A. 10 ppm B. 15 ppm C. 25 ppm D. 30 ppm |
10 ppm |
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A horizontal load, parallel to a pump shaft is called a A. Shear load B. Thrust load C. Radial load D. Stress load |
Thrust load |
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Ball and socket joints can provide deflections of up to A. 10.0 degrees B. 13.0 degrees C. 15.0 degrees D. 17.5 degrees |
15.0 degrees |
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Bearings on a line shaft turbine can be lubricated with A. Oil or water B. Grease or oil C. Lithium or grease D. Graphite or grease |
Oil or water |
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How much time does a community water system have for public notification if they have any Tier III violation? A. 60 days B. 3 months C. 6 months D. 12 months |
12 months |
