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20 Cards in this Set
- Front
- Back
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How effectively a trickling filter plant operates is mainly indicated by |
Plant effluent |
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When calibrating a pH meter, the buffers use should bracket the expected pH and |
Be at least 2 pH units apart |
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The regular polarity reversal in electrodialysis reversal______and_____. |
reduces scaling, increases the life of the membranes |
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After their precipitative softening process, the residuals produced are usually |
Calcium carbonate and magnesium hydroxide |
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What type of pipe will use elastomeric gaskets? |
Concrete |
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Tasting a little bit of a laboratory reagent is |
dangerous and can even be fatal |
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Some lead pipes, as it gets old, will crack if flexed because it |
crystallizes |
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The laboratory glassware that will give the most accurate measurement of liquids |
Burettes |
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What's the best range of dissolved oxygen in an oxidation ditch for optimum operation? |
0.5-2 mg/L |
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When is pH in a waste pond the lowest? |
Sunrise |
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What's the height limit to which siphoned water can be lifted at sea level? |
33.9 ft |
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Which of the two principal types of throttling valves? |
Pressure-reducing and altitude valves |
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When a control switch operated by pressure changes is located too close to a pump station, erratic operation can occur. This problem is known as |
Racking |
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When opening a chlorine cylinder valve |
Open only one turn to permit maximum withdrawal rate. |
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Which type of chlorine gas feeding equipment that's often called closed loop control requires an external instrument? |
Automatic residual control gas feeder |
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A solution used to determine the concentration of another solution is called a |
Standard solution |
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Which type of pump is generally used for feeding a fluoride solution because it's accurate and will operate against pressure? |
Diaphragm pump |
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Which is the last step in well Construction? |
Pump test to confirm capacity |
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Introducing water into a storage tank containing ammonia Vapors can cause |
The tank to collapse |
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Which type of relay is frequently used to detect power loss and initiate a switch over to another power source? |
Voltage relays |
