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58 Cards in this Set
- Front
- Back
The term for the combined process which transfer liquid water on earths surface into water in the gas phase in the atmosphere is: |
Evapotranspiration |
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The height to which water will rise in wells located in an artisan aquifer is called the: |
Piezometric surface |
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Quality problems encountered with raw water withdrawn from below the thermocline in stratified lakes usually stem from: |
Oxygen depletion |
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Hardness in water is due to dissolved : |
Calcium and Magnesium |
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The time normally required to obtain total coliform results from the Presumptive Test is: |
48 hours |
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A disinfection by product associated with ozone is: |
Bromate |
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The multiple tube fermentation analysis consists of: |
Presumptive, confirmed, and completed tests. |
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Common mixing methods in the flocculation process include: |
Hydraulic mixing, turbine mixers, and horizontal paddle wheels . |
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Particles that are removed readily by sedimentation and filtration process are: |
Suspended |
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A bacteriological test that measures only the presence or absence of coliform is: |
Colilert |
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Raw surface water taste and odor problems are most likely the result of: |
Blue green algae growth. |
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The purpose of flocculation is: |
Increase particle size |
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Disinfection by products can be formed by the reaction of disinfectants with: |
Natural organic matter |
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The unique ingredient in the confirmed test of the MPN method is: |
Brilliant green bile |
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A primary drinking water regulation is based upon: |
Health effects |
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Alkalinity in drinking water can be contributed by: |
Carbonate, bicarbonate and hydroxide. |
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Increasing disinfectant dosage is likely to lead to an increase in: |
Disinfection by products |
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The main advantage of chloramination over chlorination is: |
Reduced by product formation. |
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The term "CT" stands for: |
The product of residual concentration multiplied by disinfection time. |
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In the colilert method, the presence of E. Coli can be detected: |
In 24 hours. |
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The concentration of available chlorine in chlorine gas from 1 ton containers is: |
100% |
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The device used to regulate and control the rate of feed of chlorine gas is called a: |
Chlorinator |
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This is a secondary drinking water standard: |
Odor |
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Chlorine residual is measured in the field using the: |
DPD colorimetric method. |
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The device that generates the vacuum conditions for chlorine gas application is called a: |
Eductor |
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Algae growth in untreated surface water reservoirs can be reduced by applying: |
Copper sulfate |
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The vertical distance between the static water level and the pumping water level in an operating well is known as the: |
Drawdown |
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The main focus of the surface water treatment rule is the control of: |
Pathogens |
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Bacteria and viruses are particles of a size category that is called: |
Colloidal |
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The main purpose of coagulation is to: |
Destabilize colloidal particles |
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Colloidal particles resist coalescing and coagulation because of their: |
Surface charge |
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To comply with the surface water treatment rule, plants must address pathogens by: |
Physical removal and chemical inactivation |
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A chemical frequently applied prior to coagulation is: |
Chlorine |
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The most common form of coagulant aid is: |
Cationic polymer |
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This treatment technology is approved by the SWTR: |
Diatomaceous earth filtration |
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When flocculation mixing intensity drops from stage to stage, it is termed: |
Tapered flocculation |
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The layer of a stratified lake that is most likely to be impacted by algae is called the: |
Epilimnion |
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Typical filtration rates for dual media filters in conventional treatment plants are: |
2-6 gallons per minute per square foot. |
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The single most important indicator of filter performance is the removal of: |
Turbidity |
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As a typical filter run proceeds , head loss in the filter media will: |
Gradually increase |
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A chemical that is frequently applied just prior to filtration is: |
Anionic or nonionic polymer |
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The most common reason for ending a filter run is: |
Terminal head loss |
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A common form of sludge removal in rectangular sedimentation basins is: |
Chain and flight collectors |
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This is likely to occur within the first few minutes after a filter has been backwashed: |
Initial turbidity spike |
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A filter contains 24" of anthracite coal over 12" of sand over 12" of gravel. Such a filter is termed: |
A dual media filter |
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A clay layer in the soil resists the flow of groundwater. Such a layer is called: |
An aquitard. |
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During a filter run, the varying head loss associated with particle capture is offset mechanically by the automatic adjustment of the: |
Filter effluent valve |
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The lowest reportable concentration of any constituent in drinking water is the: |
Detection level for reporting |
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If you encounter a liquid chlorine leak in a one ton container, what action should you take first, to reduce the severity of the leak? |
Rotate the container to place the leak at the top. |
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Chlorine is applied at a dosage rate of 2.5 mg/l. After a reaction time of over 4 hours in the clear wells, the chlorine residual is 1.5 mg/l. What is the chlorine demand? |
1.0 mg/l |
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The biological transformation of liquid water into gaseous water vapor is called: |
Transpiration |
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The surest indicator that any single tube in a multiple tube fermentation test has positive results is: |
Gas formation |
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The surface water treatment rule requires that the combined removal and inactivation of Giardia cysts must be at least: |
3.0 logs |
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The pH value of pure water is: |
7.0 |
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The fusible plug that is in all chlorine containers: |
Should never be removed or tampered with. |
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Secondary drinking water standards are generally based upon: |
Aesthetic properties |
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The term for a water bearing formation in the soil: |
Aquifer |
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An aquifer is usually composed of: |
Sand and gravel |