Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
2.
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.
3.
What is the best process for removing turbidity?
4.
What is the only MCL that varies with the temperature?
5.
The structure Diatomaceous Earth filters media is applied to is called?
6.
Which is classified as a secondary contaminant?
7.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
8.
A connection between a potable water system and a non potable water system is?
9.
Ozone contractors must have a system to collect ozone off-gas because?
10.
What percentage of the earth's surface is covered in water?
11.
Regulations require that wastes from water treatment be monitored?
12.
A pro of chloramines is?
13.
When it is dissolved in water for disinfection purposes, how long does ozone last?
14.
Low temperature water can be compensated for when using Alum by?
15.
Why has magnetic ion exchange resin been developed?
16.
What conditions will +Eh values of water support?
17.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
18.
Records of sanitary surveys must be kept for?
19.
What type of pump is most commonly used to feed chemicals into a water supply?
20.
In order to prevent air binding in a rapid sand filter, head loss should never exceed?
21.
When using the lime soda ash process, it is impossible to produce water with a hardness of less than?
22.
Potassium Permanganate should be?
23.
A grout seal should be?
24.
What is the best probable solution if rotifers are visible in finished water?
25.
How often should the fluoride concentration be measured in treated water?
26.
The organism that causes Giardiasis
27.
The chlorine demand with vary with?
28.
Anionic polymers are used as filter aids to agglomerate small floc particles left in the sedimentation basin effluent and make them tougher to avoid?
29.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
30.
Powered activated carbon is usually used to control what?
31.
What does not pose a threat to human health in the drinking water?
32.
What is the MCL for THM's?
33.
In a saturator tank for flows of less than 100 gpm, how thick should the layer be maintained of sodium fluoride crystals?
34.
What is the maximum feed rate when adding fluoride to drinking water?
35.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
36.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
37.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
38.
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?
39.
Recovered backwash water from a conventional surface water filtration plant may be returned to the headworks if allowed under?
41.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
42.
What is the most advantageous application point for powdered activated carbon?
43.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
44.
Determining the pH is an important water quality test because the results indicate?
45.
When entering a permitted confined space entry structure, always complete a permit and?
46.
What are the precursors to THMs?
47.
Salts, Bases, and Acids lacking carbon are organic compounds.
48.
The scattering of light by the particles in finished water is from the turbidity caused by
49.
Pathogenic organisms?
50.
When the temperature of raw surface water drops significantly the flocculator paddle speed should be?
51.
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?
52.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
53.
The hydrologic cycles create what two primary sources of water?
54.
What chemical oxidant is most effective in reducing the concentration of taste and odor compounds caused by actinomycetes species?
55.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
56.
Opening the discharge valve one full turn on a chlorine cylinder will?
57.
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?
58.
What type of charge do the compounds that form when iron or aluminum salts react with water have?
59.
When a permit is required to enter a confined space, who may sign the permit?
60.
Why is it important to reduce turbidity?
61.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
62.
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when there is?
63.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
64.
What adverse effects does the secondary contaminant manganese have?
65.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
66.
What effect will an increase in total dissolved solids in water to be treated be?
67.
If a filter is operating at a normal flow rate, its ability to trap flocculated particles is suspension is a function of?
68.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
69.
In a thermally stratified reservoir, water located beneath the thermocline may?
70.
For maximum charge neutralization the average zeta potential should be in what range?
71.
Evaporated water in the earth's atmosphere will condense to form
72.
Filter alum and polymer compounds are primarily
73.
What is a major cause of short circuiting in a sedimentation basin?
74.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
75.
At minimum, the Surface Water Treatment Rule requires surface water users to use what two treatment methods?
76.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
77.
What is used for detection of chlorine gas leaks?
78.
The more hydrogen ions
79.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
80.
If a rapid gravity filter is well operated, the finished water will have?
81.
What is the main problem if particle agglomeration is occurring in a filter for iron and manganese removal at the interface of the coal layer below?
82.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
83.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
84.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
85.
Pure water can be found?
86.
What chemical may encourage growth of algae and microorganisms?
87.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
88.
Viruses are sometimes resistant to disinfection.
89.
What is the most effective method for removing tastes and odors?
90.
Why are polyphosphates used in drinking water?
91.
What causes an increase in taste and odors when natural waters lack DO?
92.
A change in the water elevation from the normal level to the pumping level is?
93.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
94.
What will cause reverse osmosis membranes to compact faster?
95.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
96.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
97.
The actions levels for lead and copper are?
98.
One of the ways an optimum coagulant dosage can be established is?
99.
Current regulations require that water treatment wastes be monitored?
100.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
