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10 Cards in this Set
- Front
- Back
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True or False
The objective of disinfecting water is to kill disease causing organisms. |
True
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There are several methods for disinfecting water. Which of the following are most widely used in drinking water applications?
a. Ozonation and Iodine b. Chlorine and bromine c. Ultraviolet and potassium permanganate d. Overliming and copper sulfite |
b. Chlorine and bromine
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True or False
Chlorine gas will have an amber color when exposed to air. |
False
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True or False
Chlorine gas is 2.5 times heavier than air. |
True
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Which of the following elements will create chloramines when chloride is added to water?
a. Ferrous iron b. Ammonia c. Hydrogen sulfide d. Manganese |
b. Ammonia
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If you are receiving complaints on chlorine smell in the drinking water what would you typically do?
a. Turn the chlorine down to lower the residual b. Turn the chlorine up to reach break point. c. Flush hydrants d. backwash filters |
b. Turn the chlorine up to reach break point.
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True or False
Gas chlorine cylinders should be located directly in front of heaters to prevent cylinders from freezing up. |
False
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The fusible plug on 150 pound cylinders is designed to melt out and relieve pressure in cylinder to prevent rupture at this temperature:
a. 100 - 130F b. 210 - 212F c. 136 - 155F d. 158 - 165F |
d. 158 - 165F
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True or False
Combined chlorine residuals are the most effective at controlling disease causing bacteria. |
False
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When replacing gas chlorine cylinders proper care should be taken to check for leaks using this method:
a. Vinegar vapor b. Sense of smell c. Soap bubbles d. Ammonia vapor |
d. Ammonia vapor
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