Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What is the most effective disinfection residual?
2.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
3.
What is the most advantageous application point for powdered activated carbon?
4.
What adverse effects does the secondary contaminant manganese have?
5.
What is the quantity of dissolved oxygen in water a function of?
6.
Which is the method for testing for total coliform bacteria?
7.
Salts, Bases, and Acids lacking carbon are organic compounds.
8.
The injection of fluoride should be as far away as possible from any chemical containing?
9.
The proper emergency kit for a 150lb chlorine cylinder is?
10.
What type of polymers are sometimes formulated with regulated substances?
11.
Every year there are approximately what percentage of confined space deaths of would be rescuers?
12.
Pure water can be found?
13.
What does a low pH favor the formation of?
14.
Adding CO2 to water will?
15.
What two principles cause water hardness?
16.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
17.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
18.
The most probable cause of a problem with a chlorinator is?
19.
What percentage of solids sludge is produced in the precipitative softening plant?
20.
Never install a new gasket when a chlorine cylinder or container is changed.
21.
At what temperature does the maximum density of water occur?
22.
Notification to the public of a Tier III violation is done
23.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
24.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
25.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
26.
As CaCO3 how much alkalinity will dry-basis alum consume?
27.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
28.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
29.
Records of sanitary surveys must be kept for?
30.
Giardia Lamblia is transmitted?
31.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
32.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
33.
To unclog the head of a chemical feed pump an operator should first?
34.
Direct filtration eliminates what conventional treatment step?
35.
Which is the best removal method if a well contains soluble iron?
36.
In what form is Iron soluble in water?
37.
Dissolved-Air flotation is particularly good for?
38.
What is the best probable solution if rotifers are visible in finished water?
39.
What forms when you add Alum to turbid water?
40.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
41.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
42.
What is the pH of a saturated solution of sodium fluoride?
43.
What is a hypochlorinator used for?
44.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
45.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
46.
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?
47.
The backwash rate must be high enough to?
48.
What is an employee's average airborne exposure in any 8 hour shift in a 40 hour work week that should not be exceeded called?
49.
Water impurities that come from plants or animals are
50.
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?
51.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
53.
At its endpoint, what color does the oxidant potassium permanganate turn?
54.
The sampling points located for required sampling of natural radionuclides are located?
55.
If a rapid gravity filter is well operated, the finished water will have?
56.
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?
57.
A common chemical added to boost alkalinity is?
58.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
59.
In order to prevent air binding in a rapid sand filter, head loss should never exceed?
60.
What emergency kit is for chlorine tank cars?
61.
For alum coagulation of color, what is the correct pH?
62.
The pH scale ranges from?
63.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
64.
What is calcium sulfate also known as?
65.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
66.
Which is the strongest disinfectant?
67.
Floc is produced when there is a chemical reaction between the coagulant and alkalinity. If the alkalinity of raw water is too low the floc formation will be poor. Some form of alkalinity must be added if the amount that is naturally found in the water source is less than?
68.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
69.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
70.
An artesian spring occurs when
71.
Evaporated water in the earth's atmosphere will condense to form
72.
What is the total concentration of dissolved solids in the wastewater from the regeneration of ion exchange units?
73.
What organism can escape coagulation and then pass through a granular filter?
74.
The continuous circulation of water from the earth into the atmosphere and back again is called?
75.
What is the main purpose for adding coagulant chemicals to raw water?
76.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
77.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
78.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
79.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
80.
If a filter is operating at a normal flow rate, its ability to trap flocculated particles is suspension is a function of?
81.
Monthly sampling results must be reported by the water purveyor?
82.
Typically, how long is the flash mixing time in the coagulation process?
83.
The treatment process that controls corrosion or scaling is known as?
84.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
85.
What tests are performed most frequently in drinking water systems?
86.
An autoclave will sterilize at
87.
Anaerobic conditions in reservoirs can cause what problem?
88.
What form is Giardia most infectious?
89.
What does it mean if there are sand boils on the surfaces of rapid sand filters during backwash?
90.
What is the cause of temporary hardness?
91.
Coliform bacteria are always?
92.
When entering a permitted confined space entry structure, always complete a permit and?
93.
The organism that causes Giardiasis
94.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
95.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
96.
What is the typical strength of calcium hypochlorite?
97.
What is a physical separation between a water supply outlet and the flood-level rim of a receiving vessel that must be at least twice the diameter of the water supply outlet and the flood-level rim of the receiving vessel. This separation must be at leasttwice the diameter of the water supply outlet and never less than one inch?
98.
The chlorine demand with vary with?
99.
What is the most favorable raw water condition for good flocculation?
100.
A connection between a potable water system and a non potable water system is?
