Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
Which of the following illnesses is it hardest to kill the organism that causes the illness?
2.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
3.
What is a hypochlorinator used for?
4.
Plant growth in a reservoir will usually be found at a depth of?
5.
What is the term that defines the calculation of a water plants physical property due wear and tear?
6.
What is the most efficient process for the removal of nitrate and nitrate?
7.
A grout seal should be?
8.
If the continuous monitoring of the residual disinfectant concentration of the water entering the water system fails, how often will an operator need to collect a grab sample until the problem is fixed?
9.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
10.
What is the most effective method for removing tastes and odors?
11.
What chemical can be added to the water system to sequester Iron and Manganese?
12.
HPC and Coliform tests are the same because they both?
13.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
14.
What is true about heterotrophic bacteria?
15.
What works best to disinfect cryptosporidium?
16.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
17.
What is the most important thing to consider in automatic startup after a power failure has occured?
18.
The continuous circulation of water from the earth into the atmosphere and back again is called?
19.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
20.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
21.
A water sample that is acidified must have a final water pH of?
22.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
23.
What would have the least impact on the efficiency of copper sulfate?
24.
What factor is used to express the relative volatility of a substance?
25.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
26.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
27.
What does the saturation point of calcium carbonate primarily depend on?
28.
What national law regulates underground disposal of wastes in deep wells?
29.
Trihalomethanes (THM's) are primarily a concern in?
30.
Past the breakpoint chlorination point, what percentage of the total chlorine residual should be free chlorine?
31.
What is put in place in a reservoir to create an even flow rate through the entire volume of a clearwell to provide a consistent amount of detention time and minimize short-circuiting?
32.
What unit process will diatoms most likely replace?
33.
At its endpoint, what color does the oxidant potassium permanganate turn?
34.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
35.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
36.
Even a low concentration of ammonia gas can be fatal to humans if it is at least?
37.
What disinfectant is commonly used and free of Cl2 to avoid THMs?
38.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
39.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
41.
What is the specific gravity standard for gases?
42.
Where are samples taken for lead and copper?
43.
A connection between a potable water system and a non potable water system is?
44.
A test(s) used to monitor the disinfection processes would be?
45.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
46.
The action level for copper is 0.015 mg/L.
47.
What is the definition of decant?
48.
During daylight hours, algae growth in a reservoir will do what?
49.
What will ion exchange remove?
50.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
51.
What is the only MCL that varies with the temperature?
52.
What are different types of media used to filter water for human consumption?
53.
A water molecule is made up of ?
54.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
55.
Most totalizer meters at treatment plants are commonly
56.
What are the precursors to THMs?
57.
The proper emergency kit for a 150lb chlorine cylinder is?
58.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
59.
Nitrification in the distribution system can best be described as?
60.
The factors that effect coagulation and flocculation with alum are
61.
Fluoride concentration above what mg/L will likely cause teeth to become pitted?
62.
The most favorable condition in raw water for good flocculation with alum is?
63.
How often should the fluoride feed system be checked?
64.
Protozoa that must be removed from raw water are?
65.
Pathogenic organisms?
66.
The size of Giardia in the trophozoite stage is approximately?
67.
Community water systems must check the natural radioactivity in their water supply at least?
68.
Filter alum and polymer compounds are primarily
69.
What is used for detection of chlorine gas leaks?
70.
What is used as part of a sedimentation basin to allow a controlled flow of the supernatant to be collected and directed to the filter beds?
71.
What will cause reverse osmosis membranes to compact faster?
72.
If dry alum and quicklime are mixed together, what will happen?
73.
What is usually used to disinfect the gravel packing of a ground water well?
74.
Backflow wash flows should expand filter media by?
75.
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when there is?
76.
Acid rain is caused by
77.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
78.
What chemical oxidant would be best for controlling the forming of THMs?
79.
What is the pH range of sodium hypochlorite?
80.
Detention time in flocculation basins are usually designed to provide for?
81.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
82.
The outlet of a forced ventilation system for a chlorinator room she be located?
83.
What is the sample size for lead and copper analysis?
84.
Current regulations require that water treatment wastes be monitored?
85.
What will neutralize chlorine?
86.
What precipitates can foul a cation exchange resin?
87.
What does a low pH favor the formation of?
88.
Coagulation is a chemical and physical reaction that converts?
89.
The Surface Water Treatment Rule states that multibarrier treatment must result in the inactivation of Giardia cysts and viruses by?
90.
What does a high pH favor the formation of?
91.
What type of filtration is permitted under the Surface Water Treatment Rule?
92.
What adverse effects does the secondary contaminant manganese have?
93.
What does total alkalinity refer to?
94.
What is the typical strength of calcium hypochlorite?
95.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
96.
At minimum, the Surface Water Treatment Rule requires surface water users to use what two treatment methods?
97.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
98.
How often should the fluoride concentration be measured in treated water?
99.
In order to prevent air binding in a rapid sand filter, head loss should never exceed?
100.
What is the process that is used to concentrate sludge?
