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20 Cards in this Set
- Front
- Back
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The use of hypochlorite increases the pH because it will form ______when added to the water |
hydroxyl ions |
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Which type of wells are commonly used near the shore of a lake or near a river? |
Radial Wells |
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Which method for measuring water levels has a distinct disadvantage where freezing occurs? |
Float-type sensors |
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Ionic compounds are formed when |
a transfer of electrons occurs |
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The pressure during fire flow conditions shouldn't drop below |
20 psi. |
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When a sample is collected, its quality begins to change because of |
chemical activity |
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Soluble oxides of metals in water will |
cause alkalinity |
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Which of the following will show Brownian motion? |
Colloids |
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Ductile-iron piping using flexible ball joints is most appropriate for |
river crossings or rugged terrain |
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How many times higher than the normal operating pressure should the pressure rating of distribution system piping be? |
2.5 to 4 times |
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Determine the depth of water in a reservoir if the PSI is 31.9 |
73.7 ft deep |
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Where will the lake water first become anaerobic? |
In the hypolimnion |
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Dissolved Oxygen |
May oxidize iron and manganese |
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What's the difference between a weak acid and a strong acid? |
Amount of hydrogen ions released |
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What's the maximum number of electrons in the First Energy ("K" shell) of an atom? |
Two electrons |
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Which bed expansion during backwashing must be achieved for filters using granular activated carbon? |
50 percent |
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Streams that flow only occasionally are called |
ephemeral streams |
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The pressure in a chlorine cylinder depends on the |
temperature of chlorine liquid |
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Velocity head should be considered when it is_____ to_____ percent of the pressure head |
1 to 2 |
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First draw samples for the analysis of lead and copper water must be collected from Taps where the water has stood Motionless in the plumbing for at least |
6 hours |
