Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
Impurities found in water that do not come from plants or animals are
2.
The actions levels for lead and copper are?
3.
A water sample that is acidified must have a final water pH of?
4.
What will ion exchange remove?
5.
Which is not considered to be a waterborne disease?
6.
What is the most effective disinfection residual?
7.
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?
8.
What form is Giardia most infectious?
9.
Pure water can be found?
10.
Coagulation is a chemical and physical reaction that converts?
11.
The organism that causes Giardiasis
12.
Filtration rates vary from what of filter surface area?
13.
Impurities that do not dissolve in water and settle out eventually are?
14.
Filter alum and polymer compounds are primarily
15.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
16.
The porous material just above the water table that holds small quantities of water by capillary action is called?
17.
Never install a new gasket when a chlorine cylinder or container is changed.
18.
Anaerobic conditions in reservoirs can cause what problem?
19.
For maximum charge neutralization the average zeta potential should be in what range?
20.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
21.
What is the most advantageous application point for powdered activated carbon?
22.
What does a low pH favor the formation of?
23.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
24.
What is the quantity of dissolved oxygen in water a function of?
25.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
26.
Where are the two points on a gravity filter used to measure head loss located?
27.
Organic chemistry is concerned with compounds containing what element?
28.
What emergency kit is for chlorine tank cars?
29.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
30.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
31.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
32.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
33.
Fluoride concentration above what mg/L will likely cause teeth to become pitted?
34.
Protozoa are larger than bacteria which are larger than viruses.
35.
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.
36.
What is potassium permanganate most effective in?
37.
What process would be most effective for the destruction of heterotrophic bacteria?
38.
Which natural electrical force keeps colloidal particles apart in water treatment?
39.
Most totalizer meters at treatment plants are commonly
40.
A pump should always be insatlled?
41.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
42.
Coliform bacteria are classified as?
43.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
44.
What type of sedimentation basins have the flow of water admitted at an angle?
45.
The backwash rate must be high enough to?
46.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
47.
The proper emergency kit for a TON chlorine cylinder is?
48.
What oxidant has a potential of producing ClO3 by products?
49.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
50.
A surface water treatment plant should have at least how many filtration beds?
51.
What is the process that is used to concentrate sludge?
52.
In a permit entry confined space, who is responsible for terminating entries?
53.
Records of sanitary surveys must be kept for?
54.
What happens when there is high algae growth in a reservoir?
55.
Community water systems must check the natural radioactivity in their water supply at least?
56.
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?
57.
Adding CO2 to water will?
58.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
59.
A pro of chloramines is?
60.
A test(s) used to monitor the disinfection processes would be?
61.
Water hardness is measured in equivalent amounts of?
62.
Where does most of the carbon dioxide in groundwater originate from?
63.
In the ion exchange softening process, once the resin can no longer soften water it must?
64.
What should the flexible copper tubing be rated at the connects a 150lb chlorine cylinder to a manifold?
65.
Test results from a multiple tube fermentation test for coliform bacteria are expressed as MPN (most probable number) per 100 milliliters, the number is determined from?
66.
What could be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle Valves, and clogging PRV and Surge Control Valves?
67.
Evaporated water in the earth's atmosphere will condense to form
68.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
69.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
70.
An increase in filter media head loss could be an indicator of?
71.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
72.
What is a major cause of short circuiting in a sedimentation basin?
73.
When treating surface water, the main reason for removing solids is?
74.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
75.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
76.
Acid rain is caused by
77.
What two principles cause water hardness?
78.
What was created to have uniform standards in Water Treatment?
79.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
80.
If there is a notification of a HazMat spill of an unknown chemical into a stream that provides water to a water treatment plant, what would be the best action taken?
81.
Bar screens are used to?
82.
What TON will consumers start to notice?
83.
Which is classified as a secondary contaminant?
84.
What will neutralize chlorine?
85.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
86.
The maximum safe level of electrical current that will not have any long lasting health effects is?
87.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
88.
The treatment process that controls corrosion or scaling is known as?
89.
When filter run times between backwashes are long, like one week, because low turbidity water is being applied to the filters, what problem could still arise?
90.
What could happen if the sludge in a sedimentation basin becomes too thick?
91.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
93.
Opening the discharge valve one full turn on a chlorine cylinder will?
94.
What is the only MCL that varies with the temperature?
95.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
96.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
97.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
98.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
99.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
100.
Pathogenic organisms?
