Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What percentage of the earth's surface is covered in water?
2.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
3.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
5.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
6.
Which is the most persistent protozoa?
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.
Why has magnetic ion exchange resin been developed?
9.
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?
10.
Gravity filters should not use more than what percent of daily production for backwash?
11.
During filtration, what role does the action of straining of suspended particles play?
12.
The porous material just above the water table that holds small quantities of water by capillary action is called?
13.
Recovered backwash water from a conventional surface water filtration plant may be returned to the headworks if allowed under?
14.
The chlorine demand with vary with?
15.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
16.
The most probable cause of a problem with a chlorinator is?
17.
What type of pump is most commonly used to feed chemicals into a water supply?
18.
Why is turbidity in drinking water undesirable?
19.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
20.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
21.
What conditions will +Eh values of water support?
22.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
23.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
24.
What type of self-contained breathing apparatus should be used at water plants?
25.
In alum sludge, what is typically the percentage of solid material?
26.
Potassium permanganate and manganese greensand are sometimes used to?
27.
Which is not considered to be a waterborne disease?
28.
Permanganate reactions are highly dependent on?
29.
What does a high pH favor the formation of?
30.
Chlorine is chosen over chloramines because chlorine?
31.
What form is the protozoan Giardia Lamblia transmitted in?
32.
A change in the water elevation from the normal level to the pumping level is?
33.
Protozoa that must be removed from raw water are?
34.
What factor is used to express the relative volatility of a substance?
35.
What do long filter runs tend to cause?
36.
What is the definition of decant?
37.
Nitrification in the distribution system can best be described as?
38.
Detention time in flocculation basins are usually designed to provide for?
39.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
40.
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?
41.
All chlorine gas rooms...
42.
A common chemical added to boost alkalinity is?
43.
What oxidant has a potential of producing ClO3 by products?
44.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
45.
The proper emergency kit for a 150lb chlorine cylinder is?
46.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
47.
What laboratory device sterilizes laboratory apparatuses and microbial media by using pressurized steam?
48.
What would have the least impact on the efficiency of copper sulfate?
49.
What is the minimum angle that self cleaning tube settlers must be placed?
50.
If a filter is operating at a normal flow rate, its ability to trap flocculated particles is suspension is a function of?
51.
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?
52.
What does it mean if there are sand boils on the surfaces of rapid sand filters during backwash?
53.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
54.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
55.
Protozoa are larger than bacteria which are larger than viruses.
56.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
57.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
58.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
59.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
60.
Ozone contractors must have a system to collect ozone off-gas because?
61.
Never install a new gasket when a chlorine cylinder or container is changed.
62.
River water is not uniform in quality from hour to hour or day to day.
63.
Where are samples taken for lead and copper?
64.
What membrane process is used to treat brackish water or seawater?
65.
Monthly sampling results must be reported by the water purveyor?
66.
Where does most of the carbon dioxide in groundwater originate from?
67.
What type of charge do the compounds that form when iron or aluminum salts react with water have?
68.
Which is the best removal method if a well contains soluble iron?
69.
Viruses are sometimes resistant to disinfection.
70.
What process change be should be done if the level of turbidity in raw water decreased from 7 to 3 NTUs?
71.
What method can be used to control scaling, but is never used to control corrosion?
72.
What is calcium sulfate also known as?
73.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
74.
The structure Diatomaceous Earth filters media is applied to is called?
75.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
76.
The upper surface of the zone of saturation of ground water in an unconfined aquifer is called the?
77.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
78.
Giardia Lamblia is transmitted?
79.
Why are polyphosphates used in drinking water?
80.
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.
81.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
82.
What is the most effective method for removing tastes and odors?
83.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
84.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
85.
The process of the build up of corrosion products is known as?
86.
Solids contact basins have much shorter detention times than conventional treatment basins.
87.
What tests are performed most frequently in drinking water systems?
88.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
89.
What will ion exchange remove?
90.
What type of chlorine gas feeder is most commonly used?
91.
What emergency kit is for chlorine tank cars?
92.
What is the cause of temporary hardness?
93.
What is true about heterotrophic bacteria?
94.
What is a hypochlorinator used for?
95.
What is the MCL for THM's?
96.
What is the best addition for water that is highly colored due to organic matter?
97.
What is put in place in a reservoir to create an even flow rate through the entire volume of a clearwell to provide a consistent amount of detention time and minimize short-circuiting?
98.
Pure water can be found?
99.
Which of the following composes the majority of scale in pipes?
100.
Granular activated carbon is used as?
