Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
2.
What effect will an increase in total dissolved solids in water to be treated be?
3.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
4.
A pro of chloramines is?
5.
What is the definition of decant?
6.
What is the process that is used to concentrate sludge?
7.
Which process helps remove contaminants in water by causing them to cling to the surface of certain filter grains?
8.
What organism can escape coagulation and then pass through a granular filter?
9.
The scattering of light by the particles in finished water is from the turbidity caused by
10.
Impurities found in water that do not come from plants or animals are
11.
In the ion exchange softening process, once the resin can no longer soften water it must?
12.
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?
13.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
14.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
15.
The size of Giardia in the trophozoite stage is approximately?
16.
Detention time in flocculation basins are usually designed to provide for?
17.
Which of these has the most impact on tastes and odors in water?
18.
For surface water systems without filtration, the Surface Water Treatment Rule requires public water systems to
19.
Granular activated carbon is used as?
20.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
21.
What is recarbonation?
22.
A surface water treatment plant should have at least how many filtration beds?
23.
Permanganate reactions are highly dependent on?
24.
How does Groundwater differ from Surface water sources?
25.
What form is Giardia most infectious?
26.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
27.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
28.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
29.
What term describes the gathering of colloids into larger particles?
30.
Evaporated water in the earth's atmosphere will condense to form
31.
The minimum detention time in a conventional detention basin is?
32.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
33.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
34.
Water impurities that come from plants or animals are
35.
What does the saturation point of calcium carbonate primarily depend on?
36.
What membrane process is used to treat brackish water or seawater?
37.
What will increase alkalinity, pH, and hardness?
38.
Water hardness is measured in equivalent amounts of?
39.
A chlorine evaporator maintains a water bath at?
40.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
41.
An increase in filter media head loss could be an indicator of?
42.
Potassium Permanganate should be?
43.
Why are check valves installed in suction lines?
44.
The chlorine demand with vary with?
45.
What will ion exchange remove?
46.
HPC and Coliform tests are the same because they both?
47.
The proper emergency kit for a chlorine tanker is?
48.
What is the best probable solution if rotifers are visible in finished water?
49.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
50.
Why are polyphosphates used in drinking water?
51.
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.
52.
What is the usual effective pH range of iron salt coagulants?
53.
A water sample that is acidified must have a final water pH of?
54.
What zone in a lake or reservoir has weeds that grow underwater that may cause taste & odor complaints?
55.
What does it mean if there are sand boils on the surfaces of rapid sand filters during backwash?
56.
Which is classified as a secondary contaminant?
57.
Where do Enteropathogenic organisms in water supplies originate?
58.
The disinfection treatment process is?
59.
In alum sludge, what is typically the percentage of solid material?
60.
A property that is important to water treatment that is physical as opposed to chemical is?
61.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
62.
What is the most probable solution if nematodes are interfering with the disinfectant?
63.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
64.
Who can declare the vulnerability of a water source?
65.
What is the quantity of dissolved oxygen in water a function of?
66.
The action level for copper is 0.015 mg/L.
67.
Which is not considered to be a waterborne disease?
68.
River water is not uniform in quality from hour to hour or day to day.
69.
Which is the most persistent protozoa?
70.
Typically, how long is the flash mixing time in the coagulation process?
71.
Filter alum and polymer compounds are primarily
72.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
73.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
74.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
75.
Low temperature water can be compensated for when using Alum by?
76.
What does a high pH favor the formation of?
77.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
78.
Records of sanitary surveys must be kept for?
79.
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?
80.
What is the motion called for the particles in water that are in constant motion and work in conjunction with the destabilization process to create floc?
81.
The porous material just above the water table that holds small quantities of water by capillary action is called?
82.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
83.
What is the most important reason to reduce turbidity?
84.
What water quality indicator is of greatest concern in a surface water treatment plant?
85.
The IDLH (immediately dangerous to life and health) value for chlorine is?
86.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
87.
The hydrologic cycles create what two primary sources of water?
88.
The factors that effect coagulation and flocculation with alum are
89.
The treatment process that controls corrosion or scaling is known as?
90.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
91.
What is calcium sulfate also known as?
92.
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?
93.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
94.
What process change be should be done if the level of turbidity in raw water decreased from 7 to 3 NTUs?
95.
Coliform bacteria are always?
96.
Once they become fouled, how are reverse osmosis membranes cleaned?
97.
What is used for detection of chlorine gas leaks?
98.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
99.
What is the process that is used to dewater sludge?
100.
What chemicals are used to substitute chlorine as pre-oxidants to minimize the formation of disinfection byproducts in a water plant?
