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20 Cards in this Set
- Front
- Back
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pH is a measure of |
hydrogen ions |
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Why is excessive water pressure to residential homes objectionable? |
It increases the life of water heaters and other water-using appliances. |
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What is the term for a framework of wood or metal installed to prevent caving or trench walls? |
Shoring |
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What is the best location for a tap on a main? |
40° down from the top of the main |
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What type of cleaning plug has hardened steel or silicon carbide wire brushes? |
Scraping Pig |
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Which of the following parameters is used to indicate the clarity of water? |
Turbidity |
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Because it is impossible to routinely test for presence of a specific microorganism in drinking water, the US Environmental Protection Agency requires, for surface water systems, the use of |
treatment techniques |
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Which of the following is required treatment technique for the control of lead? |
Corrosion control |
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An arterial-loop distribution system has flow from how many directions? |
4 |
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Which of the following mandates that language in message a public notification? |
Us Environmental Protection Agency |
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Bar screens are used to |
Remove debris |
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When is the specific gravity for a solution that weighs 10.27 lb per gallon? |
1.23 |
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Which type of hydrant has no main valve but has a seperate valve for each nozzle? |
Wet-barrel |
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Which of the following about should be used when it becomes necessary to supply water at different pressure zones? |
Pressure-reducing |
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Which of the following will most accurately measure 500 mL of solution? |
500-mL volumetric flask |
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Depending on its concentration and length of exposure, which of the following gases can cause long and skin irritation? |
Chlorine |
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Which of the following is colorless, odorless, lighter than air, highly flammable, and sometimes called swamp gas? |
Methane |
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In coliform analysis using the presence absence test, a sample should be incubated for |
24 and 48 hr at 35°C. |
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The most effective disinfection residual is |
Hypochlorous acid |
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Which type of solution contains 1 gram equivalent weight of a reactant compound per liter of solution? |
Normal Solution |
