Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What method can be used to control scaling, but is never used to control corrosion?
2.
What laboratory device sterilizes laboratory apparatuses and microbial media by using pressurized steam?
3.
An autoclave will sterilize at
4.
What are the four zones that divide a typical sedimentation basin?
5.
What do long filter runs tend to cause?
6.
What could be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle Valves, and clogging PRV and Surge Control Valves?
7.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
8.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
9.
What emergency kit is for chlorine tank cars?
10.
Where does most of the carbon dioxide in groundwater originate from?
11.
What will accurately measure 500mL solution?
12.
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.
13.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
14.
What causes an increase in taste and odors when natural waters lack DO?
15.
What is calcium sulfate also known as?
16.
What adverse effects does the secondary contaminant manganese have?
17.
Which of these has the most impact on tastes and odors in water?
18.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
19.
When a permit is required to enter a confined space, who may sign the permit?
20.
What should be determined first before an in ground sedimentation tank is drained?
21.
What is the MCLG for chloride?
22.
Which oxidant has the protentional of producing Chlorate (Cl03) by-products?
23.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
24.
The scattering of light by the particles in finished water is from the turbidity caused by
25.
In the MNO-MUG test the presence of E.coli is indicted by?
26.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
27.
Which natural electrical force keeps colloidal particles apart in water treatment?
28.
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?
29.
What is the term that defines the calculation of a water plants physical property due wear and tear?
30.
Community water systems must check the natural radioactivity in their water supply at least?
31.
Once they become fouled, how are reverse osmosis membranes cleaned?
32.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
33.
What percentage of the earth's surface is covered in water?
34.
Why are polyphosphates used in drinking water?
35.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
36.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
37.
Solids contact basins have much shorter detention times than conventional treatment basins.
38.
What is a major cause of short circuiting in a sedimentation basin?
39.
What will occur if the activation process of silica is not carefully controlled?
40.
In the ion exchange softening process, once the resin can no longer soften water it must?
41.
What changes does an operator need to make when there are issues with floc formation?
42.
The advantage of using oxidant ozone is that it?
43.
Coliform bacteria are classified as?
44.
What is the most probable solution if nematodes are interfering with the disinfectant?
45.
Which process helps remove contaminants in water by causing them to cling to the surface of certain filter grains?
46.
What term describes the gathering of colloids into larger particles?
47.
What is the best disinfectant against Cryptosporidium?
49.
What percentage of solids sludge is produced in the precipitative softening plant?
50.
To unclog the head of a chemical feed pump an operator should first?
51.
Water that is softened has a high pH and a high concentration of CaCO3. Therefore stabilization is essential in order to prevent the CaCO3 from precipitating out on?
52.
In a saturator tank for flows of less than 100 gpm, how thick should the layer be maintained of sodium fluoride crystals?
53.
Backflow wash flows should expand filter media by?
54.
Organic chemistry is concerned with compounds containing what element?
55.
Salts, Bases, and Acids lacking carbon are organic compounds.
56.
Filtration rates vary from what of filter surface area?
57.
What does it mean if there are sand boils on the surfaces of rapid sand filters during backwash?
58.
Protozoa that must be removed from raw water are?
59.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
60.
The minimum detention time in a conventional detention basin is?
61.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
62.
What chemical oxidant is most effective in reducing the concentration of taste and odor compounds caused by actinomycetes species?
63.
A common chemical added to boost alkalinity is?
64.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
65.
What is the main purpose for adding coagulant chemicals to raw water?
66.
In pounds, how much ammonia is contained in a 1 ton cylinder that is full?
67.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
68.
What is usually used to disinfect the gravel packing of a ground water well?
69.
What process change be should be done if the level of turbidity in raw water decreased from 7 to 3 NTUs?
70.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
71.
What is the most effective method for removing tastes and odors?
72.
Reaching breakpoint chlorination means?
73.
What should an authorized entrant do before he/she enters a permitted confined space?
74.
What device collects the settled water as it leaves the sedimentation basin?
75.
An increase in filter media head loss could be an indicator of?
76.
What is the best process for removing turbidity?
77.
What happens when there is high algae growth in a reservoir?
78.
Free chlorine residual values are based on contact time of at least?
79.
As CaCO3 how much alkalinity will dry-basis alum consume?
80.
During daylight hours, algae growth in a reservoir will do what?
81.
Notification to the public of a Tier III violation is done
82.
Nitrification in the distribution system can best be described as?
83.
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?
84.
What does total alkalinity refer to?
85.
What effect will an increase in total dissolved solids in water to be treated be?
86.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
87.
The most accurate chlorine residual measurement would be taken with?
88.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
89.
Water hardness is measured in equivalent amounts of?
90.
The organism that causes Giardiasis
91.
Regulations require that wastes from water treatment be monitored?
92.
Even a low concentration of ammonia gas can be fatal to humans if it is at least?
93.
What is the specific gravity standard for gases?
94.
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?
95.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
96.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
97.
What is the most troublesome operating problem for a sedimentation basin?
98.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
99.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
100.
Which of the following illnesses is it hardest to kill the organism that causes the illness?
