Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What term describes the gathering of colloids into larger particles?
2.
The sampling points located for required sampling of natural radionuclides are located?
3.
What chemical oxidant would be most effective for controlling biological growth?
4.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
5.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
6.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
7.
The hydrologic cycles create what two primary sources of water?
8.
Why are check valves installed in suction lines?
9.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
10.
What zone in a lake or reservoir has weeds that grow underwater that may cause taste & odor complaints?
11.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
12.
How often should the fluoride concentration be measured in treated water?
13.
What chemical could cause pink water problems?
14.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
15.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
16.
What is the MCL for THM's?
17.
During filtration, what role does the action of straining of suspended particles play?
18.
When treating surface water, the main reason for removing solids is?
19.
What device collects the settled water as it leaves the sedimentation basin?
20.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
21.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
22.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
23.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
24.
Pulsator clarifiers are used to?
25.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
26.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
27.
What is the most important thing to consider in automatic startup after a power failure has occured?
28.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
29.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
30.
One criteria to avoid filtration is that the fecal coliform concentration must be equal to or less than how many mg/L in representative samples of the source water immediately before the first or only point of disinfectant application in at least what percentage of the measurements made for the previous 6 months that the system served water to the public on an ongoing basis.
31.
Anaerobic conditions in reservoirs can cause what problem?
32.
What is the sample size for lead and copper analysis?
33.
What does total alkalinity refer to?
34.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
35.
What tests are performed most frequently in drinking water systems?
36.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
37.
Alachlor, Lindane, and Toxaphene are examples of?
38.
The backwash rate must be high enough to?
39.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
40.
Most totalizer meters at treatment plants are commonly
41.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
42.
The size of Giardia in the trophozoite stage is approximately?
43.
A pro of chloramines is?
44.
In the ion exchange softening process, once the resin can no longer soften water it must?
45.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
46.
Where does most of the carbon dioxide in groundwater originate from?
47.
Potassium Permanganate should be?
48.
The ion exchange process usually is used to remove what from water?
49.
What is dissolved air flotation good for removing?
50.
Detention time in flocculation basins are usually designed to provide for?
51.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
52.
What was created to have uniform standards in Water Treatment?
53.
What device found in labs sterilizes by using pressurized steam?
54.
Who can declare the vulnerability of a water source?
55.
What is the best disinfectant against Cryptosporidium?
56.
What is the most efficient process for the removal of nitrate and nitrate?
57.
The treatment process that controls corrosion or scaling is known as?
58.
What should be determined first before an in ground sedimentation tank is drained?
59.
What form is the protozoan Giardia Lamblia transmitted in?
60.
Why are polyphosphates used in drinking water?
61.
Pure water can be found?
62.
Daily flow rates are limited in a conventional treatment plant due to the detention time needed to settle the floc and its sedimentation basin. What is the time range for the clarifier?
63.
What is the most effective method for removing tastes and odors?
64.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
65.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
66.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
67.
The Marble test is associated with?
68.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
69.
What is the term that defines the calculation of a water plants physical property due wear and tear?
70.
The chlorine demand with vary with?
71.
Records of chemical analyses should be kept for?
72.
What are the four zones that divide a typical sedimentation basin?
73.
How is chlorine dioxide formed?
74.
What conventional treatment step is eliminated by direct filtration?
75.
A surface water treatment plant should have at least how many filtration beds?
76.
What is the motion called for the particles in water that are in constant motion and work in conjunction with the destabilization process to create floc?
77.
The proper emergency kit for a chlorine tanker is?
78.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
79.
For maximum charge neutralization the average zeta potential should be in what range?
80.
What process would be most effective for the destruction of heterotrophic bacteria?
81.
Coliform bacteria are always?
82.
Free chlorine residual values are based on contact time of at least?
83.
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?
84.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
85.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
86.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
87.
What is measured to determine total alkalinity?
88.
The process by which water becomes a gas and rises is called?
89.
One of the ways an optimum coagulant dosage can be established is?
90.
The maximum sustained flow possible from a well mostly depends on?
91.
Which is a chemical used in water treatment as a coagulating chemical?
92.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
93.
What is used to prevent water from entering a gas chlorinator?
94.
What oxidant has a potential of producing ClO3 by products?
95.
The IDLH (immediately dangerous to life and health) value for chlorine is?
96.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
97.
What will ion exchange remove?
98.
When it is dissolved in water for disinfection purposes, how long does ozone last?
99.
The loss of chloramine residuals in a water line or a storage tank is due to?
100.
What chemical is slacked lime?
