Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
2.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
3.
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?
4.
What is true about heterotrophic bacteria?
5.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
6.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
7.
What national law regulates underground disposal of wastes in deep wells?
8.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
9.
What type of self-contained breathing apparatus should be used at water plants?
10.
The action level for copper is 0.015 mg/L.
11.
Acid rain is caused by
12.
What is the maximum feed rate when adding fluoride to drinking water?
13.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
14.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
15.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
16.
What membrane process is used to treat brackish water or seawater?
17.
A surface water treatment plant should have at least how many filtration beds?
18.
Which of the following composes the majority of scale in pipes?
19.
What is the best process for removing turbidity?
20.
An increase in filter media head loss could be an indicator of?
21.
What is measured to determine total alkalinity?
22.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
23.
For maximum charge neutralization the average zeta potential should be in what range?
24.
When treating surface water, the main reason for removing solids is?
25.
Wet activated carbon will remove what from the air? (In regards to safety)
26.
One of the steps taken to determine the threshold odor number is?
27.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
28.
A chlorine evaporator maintains a water bath at?
29.
The most probable cause of a problem with a chlorinator is?
30.
What will occur if the activation process of silica is not carefully controlled?
31.
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.
32.
What is used to prevent water from entering a gas chlorinator?
33.
A constituent dissolved in source water that will precipitate when oxidized is?
34.
Monthly sampling results must be reported by the water purveyor?
35.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
36.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
37.
What chemical is slacked lime?
38.
Adding CO2 to water will?
39.
The maximum safe level of electrical current that will not have any long lasting health effects is?
40.
The most accurate chlorine residual measurement would be taken with?
41.
Water treatment chemicals are added based on?
42.
What is the specific gravity standard for gases?
43.
The actions levels for lead and copper are?
44.
What is a hypochlorinator used for?
45.
When soda ash is added to water for softening purposes what will it do?
46.
How often should the fluoride feed system be checked?
47.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
48.
What does a high pH favor the formation of?
49.
The process of the build up of corrosion products is known as?
51.
What chemical oxidant would be best for controlling the forming of THMs?
52.
What conventional treatment step is eliminated by direct filtration?
53.
What sludge dewatering process requires a pre-coat of diatomaceous earth and its use has declined due to other newer methods?
54.
What is the MCL for THM's?
55.
A property that is important to water treatment that is physical as opposed to chemical is?
56.
What precipitates can foul a cation exchange resin?
57.
What type of polymers are sometimes formulated with regulated substances?
58.
What disinfectant is commonly used and free of Cl2 to avoid THMs?
59.
What is the only MCL that varies with the temperature?
60.
What is the best process for sequestering manganese?
61.
Under the process of safety management, sites are required to do a site assessment if the facility in a single process has more than how many pounds of chlorine?
62.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
63.
One of the ways an optimum coagulant dosage can be established is?
64.
What unit process will diatoms most likely replace?
65.
Low temperature water can be compensated for when using Alum by?
66.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
67.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
68.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
69.
In the ion exchange softening process, once the resin can no longer soften water it must?
70.
Nitrification in the distribution system can best be described as?
71.
What is the depression around the well of the water surface caused by pumping water from a well?
72.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
73.
What form is Giardia most infectious?
74.
River water is not uniform in quality from hour to hour or day to day.
75.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
76.
When must a water system collect annual samples if the water system has been determined to be reliable by the State and consistently below the MCL level for organic compounds?
77.
During daylight hours, algae growth in a reservoir will do what?
78.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
79.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
80.
Filter alum and polymer compounds are primarily
81.
What does a low pH favor the formation of?
82.
What is the best probable solution if rotifers are visible in finished water?
83.
The proper emergency kit for a 150lb chlorine cylinder is?
84.
When entering a permitted confined space entry structure, always complete a permit and?
85.
What is the pH range of sodium hypochlorite?
86.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
87.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
88.
What makes chlorine use more advantageous over chloramines?
89.
Who can declare the vulnerability of a water source?
90.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
91.
Bar screens are used to?
92.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
93.
Once they become fouled, how are reverse osmosis membranes cleaned?
94.
The advantage of using oxidant ozone is that it?
95.
Trihalomethanes (THM's) are primarily a concern in?
96.
Records of sanitary surveys must be kept for?
97.
In a saturator tank for flows of less than 100 gpm, how thick should the layer be maintained of sodium fluoride crystals?
98.
What percentage of the earth's surface is covered in water?
99.
What is a universal solvent?
100.
The disinfection treatment process is?
