Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What type of algae would most likely be found in nutrient rich water?
2.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
3.
As CaCO3 how much alkalinity will dry-basis alum consume?
4.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
5.
Alachlor, Lindane, and Toxaphene are examples of?
6.
In the ion exchange softening process, once the resin can no longer soften water it must?
7.
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?
9.
To unclog the head of a chemical feed pump an operator should first?
10.
The maximum safe level of electrical current that will not have any long lasting health effects is?
11.
An artesian spring occurs when
12.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
13.
Anaerobic conditions in reservoirs can cause what problem?
14.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
15.
What is the best disinfectant against Cryptosporidium?
16.
In a thermally stratified reservoir, water located beneath the thermocline may?
17.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
18.
Who can declare the vulnerability of a water source?
19.
What is the most advantageous application point for powdered activated carbon?
20.
What is the pH of a saturated solution of sodium fluoride?
21.
Which of these has the most impact on tastes and odors in water?
22.
If ammonia vapor is passed over a chlorine leak in a cylinder valve, the leak is indicate by
23.
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?
24.
What tests are performed most frequently in drinking water systems?
25.
Most totalizer meters at treatment plants are commonly
26.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
27.
The temperature range at which coliform bacteria samples must be stored before being delivered to a lab is?
28.
What is the best probable solution if rotifers are visible in finished water?
29.
In the MNO-MUG test the presence of E.coli is indicted by?
30.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
31.
Monthly sampling results must be reported by the water purveyor?
32.
If a filter is operating at a normal flow rate, its ability to trap flocculated particles is suspension is a function of?
33.
What would be the most probable solution to control algae in the source water if the algae is clogging the filters in the water plant?
34.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
35.
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?
36.
HPC and Coliform tests are the same because they both?
37.
What effect will caustic soda (NaOH)have on water?
38.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
39.
What is true about heterotrophic bacteria?
40.
When it is dissolved in water for disinfection purposes, how long does ozone last?
41.
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.
42.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
43.
Which is the strongest disinfectant?
44.
Coagulation is a chemical and physical reaction that converts?
45.
What national law regulates underground disposal of wastes in deep wells?
46.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
47.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
48.
What happens when there is high algae growth in a reservoir?
49.
What water quality indicator is of greatest concern in a surface water treatment plant?
50.
What is the best addition for water that is highly colored due to organic matter?
51.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
52.
What is used for detection of chlorine gas leaks?
53.
Gravity filters should not use more than what percent of daily production for backwash?
54.
Impurities that do not dissolve in water and settle out eventually are?
55.
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?
57.
To regenerate virgin greensand it must be soaked in the filter bed for several hours in a solution of chlorine containing?
58.
Where do Enteropathogenic organisms in water supplies originate?
59.
What will increase alkalinity, pH, and hardness?
60.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
61.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
62.
What are the precursors to THMs?
63.
What makes chlorine use more advantageous over chloramines?
64.
The chlorine demand with vary with?
65.
Radon is a radioactive decay daughter of radium 226.
66.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
67.
When the temperature of raw surface water drops significantly the flocculator paddle speed should be?
68.
What is the minimum angle that self cleaning tube settlers must be placed?
69.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
70.
What water quality indicator should be considered in a lake de-stratification program?
71.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
72.
What chemical can be added to the water system to sequester Iron and Manganese?
73.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
74.
If a water system collects at least 40 samples per month for total coliform analysis, no more than 20% of samples can come back positive.
75.
The pH scale ranges from?
76.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
77.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
78.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
79.
What is the main purpose for adding coagulant chemicals to raw water?
80.
Turbidity in the drinking water system can not exceed?
81.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
82.
What precipitates can foul a cation exchange resin?
83.
Why is turbidity in drinking water undesirable?
84.
What type of filtration is permitted under the Surface Water Treatment Rule?
85.
The maximum sustained flow possible from a well mostly depends on?
86.
The backwash rate must be high enough to?
87.
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?
88.
In a permit entry confined space, who is responsible for terminating entries?
89.
When using chloramines
90.
What is the cause of temporary hardness?
91.
What chemical oxidant is most effective in reducing the concentration of taste and odor compounds caused by actinomycetes species?
92.
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?
93.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
94.
Pulsator clarifiers are used to?
95.
A constituent dissolved in source water that will precipitate when oxidized is?
96.
What emergency kit is for chlorine tank cars?
97.
A total coliform positive sample must be tested for the presence of?
98.
Ion exchange processes can typically be used for direct groundwater treatment as long as turbidity and what else have levels that are not excessive?
99.
What is potassium permanganate most effective in?
100.
What works best to disinfect cryptosporidium?
