Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What is the main function of a flocculation basin?
2.
Why are check valves installed in suction lines?
3.
Dissolved-Air flotation is particularly good for?
4.
In a saturator tank for flows of less than 100 gpm, how thick should the layer be maintained of sodium fluoride crystals?
5.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
6.
Most regulated contaminants in drinking water?
7.
For alum coagulation of color, what is the correct pH?
8.
A surface water treatment plant should have at least how many filtration beds?
9.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
10.
Which is the method for testing for total coliform bacteria?
11.
Fluoride concentration above what mg/L will likely cause teeth to become pitted?
12.
The Marble test is associated with?
13.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
14.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
15.
What is the most effective method for removing tastes and odors?
16.
What type of polymers are sometimes formulated with regulated substances?
17.
The injection of fluoride should be as far away as possible from any chemical containing?
18.
Water that is softened has a high pH and a high concentration of CaCO3. Therefore stabilization is essential in order to prevent the CaCO3 from precipitating out on?
19.
Why is water softening a part of the water treatment process?
20.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
21.
To unclog the head of a chemical feed pump an operator should first?
22.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
23.
Wet activated carbon will remove what from the air? (In regards to safety)
24.
Coliform bacteria are classified as?
25.
What is the best process for removing turbidity?
26.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
27.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
28.
What emergency kit is for chlorine tank cars?
29.
What is true about heterotrophic bacteria?
30.
The sampling points located for required sampling of natural radionuclides are located?
31.
What does the saturation point of calcium carbonate primarily depend on?
32.
A property that is important to water treatment that is physical as opposed to chemical is?
33.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
34.
Notification to the public of a Tier III violation is done
35.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
36.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
37.
What is the minimum angle that self cleaning tube settlers must be placed?
38.
What is the usual effective pH range of iron salt coagulants?
39.
In the MNO-MUG test the presence of E.coli is indicted by?
40.
What gas can cause lung and skin irritation?
41.
What range of temperatures will fusible plugs on chlorine cylinders melt?
42.
What type of pump is most commonly used to feed chemicals into a water supply?
43.
What is the main problem if particle agglomeration is occurring in a filter for iron and manganese removal at the interface of the coal layer below?
44.
What would have the least impact on the efficiency of copper sulfate?
45.
Organic chemistry is concerned with compounds containing what element?
46.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
47.
What percentage of solids sludge is produced in the precipitative softening plant?
48.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
49.
What is the principle form of alkalinity found in raw water from both surface and ground sources?
50.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
51.
What happens when there is high algae growth in a reservoir?
52.
What national law regulates underground disposal of wastes in deep wells?
53.
The pH scale ranges from?
54.
What is the most favorable raw water condition for good flocculation?
55.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
56.
Trihalomethanes (THM's) are primarily a concern in?
57.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
58.
What should the an above ground raw water source be tested for if a water plant gets its water from a river that is subject to a cattle feed lot where water runs off?
59.
What will accurately measure 500mL solution?
60.
What chemical can be added to the water system to sequester Iron and Manganese?
61.
Turbidity in the drinking water system can not exceed?
62.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
63.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
64.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
65.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
66.
Anionic polymers are used as filter aids to agglomerate small floc particles left in the sedimentation basin effluent and make them tougher to avoid?
67.
What is the MCLG for chloride?
68.
What is the most advantageous application point for powdered activated carbon?
69.
As CaCO3 how much alkalinity will dry-basis alum consume?
70.
The continuous circulation of water from the earth into the atmosphere and back again is called?
71.
For maximum charge neutralization the average zeta potential should be in what range?
72.
Settled backwash water that is recovered and re-used from a conventional surface water filtration plant should be returned to the beginning of the treatment train.
73.
During daylight hours, algae growth in a reservoir will do what?
74.
What type of chlorine gas feeder is most commonly used?
75.
A grout seal should be?
76.
What is the best process for sequestering manganese?
77.
What two principles cause water hardness?
78.
The IDLH (immediately dangerous to life and health) value for chlorine is?
80.
The outlet of a forced ventilation system for a chlorinator room she be located?
81.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
82.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
83.
What chemicals are used to substitute chlorine as pre-oxidants to minimize the formation of disinfection byproducts in a water plant?
84.
If there is debris found in the filter bed after backwashing a filter this can indicate?
85.
What is the usual range of percent sludge solids, if the sludge is allowed to accumulate and compact at the bottom of a sedimentation basin?
86.
The monitoring program that checks for Benzene (Leaking Underground Storage Tank) is checking for what kind of chemical contaminant?
87.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
88.
The most accurate chlorine residual measurement would be taken with?
89.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
90.
What test is used to determine the presence of coliform bacteria?
91.
What is dissolved air flotation good for removing?
92.
At minimum, the Surface Water Treatment Rule requires surface water users to use what two treatment methods?
93.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
94.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
95.
In gram staining, part of the coliform verification is?
96.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
97.
The maximum sustained flow possible from a well mostly depends on?
99.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
100.
Gravity filters should not use more than what percent of daily production for backwash?
