Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
To unclog the head of a chemical feed pump an operator should first?
2.
The ion exchange process usually is used to remove what from water?
3.
Which is a chemical used in water treatment as a coagulating chemical?
4.
Which process helps remove contaminants in water by causing them to cling to the surface of certain filter grains?
5.
What chemicals are used to substitute chlorine as pre-oxidants to minimize the formation of disinfection byproducts in a water plant?
6.
The scattering of light by the particles in finished water is from the turbidity caused by
7.
What two principles cause water hardness?
8.
Dissolved-Air flotation is particularly good for?
9.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
10.
In the ion exchange softening process, once the resin can no longer soften water it must?
11.
Radon is a radioactive decay daughter of radium 226.
12.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
13.
Pathogenic organisms?
14.
Free chlorine residual values are based on contact time of at least?
15.
What is the pH range of sodium hypochlorite?
16.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
17.
What is the term that defines the calculation of a water plants physical property due wear and tear?
18.
A public water system that can not meet the required removal of TOC can comply if the source water TOC level is what, calculated quarterly as a running annual average.
19.
The backwash rate must be high enough to?
20.
The size of Giardia in the trophozoite stage is approximately?
21.
According to the AWWA, the time period a filter should be used and then replaced is?
22.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
23.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
24.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
25.
The factors that effect coagulation and flocculation with alum are
26.
Impurities found in water that do not come from plants or animals are
27.
Every year there are approximately what percentage of confined space deaths of would be rescuers?
28.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
29.
In order to prevent air binding in a rapid sand filter, head loss should never exceed?
30.
The temperature range at which coliform bacteria samples must be stored before being delivered to a lab is?
31.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
32.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
33.
Which is the method for testing for total coliform bacteria?
34.
If a filter is operating at a normal flow rate, its ability to trap flocculated particles is suspension is a function of?
35.
What precipitates can foul a cation exchange resin?
36.
What is the process that is used to dewater sludge?
37.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
38.
Why has magnetic ion exchange resin been developed?
39.
As the level of phosphates increase in a new water supply, an operator should?
40.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
41.
Coagulation occurs during the first
42.
Which is the most persistent protozoa?
44.
Organic chemistry is concerned with compounds containing what element?
45.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
46.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
47.
Records of sanitary surveys must be kept for?
48.
Granular activated carbon is used as?
49.
Evaporated water in the earth's atmosphere will condense to form
50.
What is recarbonation?
51.
What was created to have uniform standards in Water Treatment?
52.
What type of charge do the compounds that form when iron or aluminum salts react with water have?
53.
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?
54.
In the MNO-MUG test the presence of E.coli is indicted by?
55.
Impurities that do not dissolve in water and settle out eventually are?
56.
What test is used to determine the presence of coliform bacteria?
57.
One of the ways an optimum coagulant dosage can be established is?
58.
What will accurately measure 500mL solution?
59.
A common chemical added to boost alkalinity is?
60.
What changes does an operator need to make when there are issues with floc formation?
61.
The pH scale ranges from?
62.
A connection between a potable water system and a non potable water system is?
63.
What chemical can be added to the water system to sequester Iron and Manganese?
64.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
65.
How often should the fluoride feed system be checked?
66.
What is the best process for sequestering manganese?
67.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
68.
An artesian spring occurs when
69.
In which state are Giardia most vulnerable to inactivation through disinfection?
70.
What is the usual range of percent sludge solids, if the sludge is allowed to accumulate and compact at the bottom of a sedimentation basin?
71.
Giardia Lamblia is transmitted?
72.
What is the only MCL that varies with the temperature?
73.
What chemical oxidant would be best for controlling the forming of THMs?
74.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
75.
What is used for detection of chlorine gas leaks?
76.
Why are polyphosphates used in drinking water?
77.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
78.
What is the main purpose for adding coagulant chemicals to raw water?
79.
What sludge dewatering process requires a pre-coat of diatomaceous earth and its use has declined due to other newer methods?
80.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
81.
The proper emergency kit for a TON chlorine cylinder is?
82.
What is the most advantageous application point for powdered activated carbon?
83.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
84.
What is the most effective method for the removal of disinfection by products?
85.
Where are samples taken for lead and copper?
86.
At what temperature does the maximum density of water occur?
87.
Filtration rates vary from what of filter surface area?
88.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
89.
A water molecule is made up of ?
90.
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?
91.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
92.
During daylight hours, algae growth in a reservoir will do what?
93.
What is the usual effective pH range of iron salt coagulants?
94.
Adding CO2 to water will?
95.
What national law regulates underground disposal of wastes in deep wells?
96.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
97.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
98.
What is the most effective method for removing tastes and odors?
99.
Coliform bacteria are always?
100.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
