Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
Backflow wash flows should expand filter media by?
2.
Giardia Lamblia is transmitted?
3.
Why has magnetic ion exchange resin been developed?
4.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
5.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
6.
What is the best process for removing turbidity?
7.
Bar screens are used to?
8.
What term describes the gathering of colloids into larger particles?
9.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
10.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
11.
Acid rain is caused by
12.
Which is the most persistent protozoa?
13.
What will occur if the activation process of silica is not carefully controlled?
14.
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?
15.
When using the lime soda ash process, it is impossible to produce water with a hardness of less than?
16.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
17.
What type of chlorine gas feeder is most commonly used?
18.
What should be determined first before an in ground sedimentation tank is drained?
19.
Which is classified as a secondary contaminant?
20.
What is the only MCL that varies with the temperature?
21.
For maximum charge neutralization the average zeta potential should be in what range?
22.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
23.
What are the four zones that divide a typical sedimentation basin?
24.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
25.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
26.
Which of the following composes the majority of scale in pipes?
27.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
28.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
29.
What emergency kit is for chlorine tank cars?
30.
Reaching breakpoint chlorination means?
31.
When the cell division in bacteria has been disrupted, it has been?
32.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
33.
What type of sedimentation basins have the flow of water admitted at an angle?
34.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
35.
One of the steps taken to determine the threshold odor number is?
36.
The IDLH (immediately dangerous to life and health) value for chlorine is?
37.
The process of the build up of corrosion products is known as?
38.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
39.
What is the best process for sequestering manganese?
40.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
41.
What national law regulates underground disposal of wastes in deep wells?
42.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
43.
An artesian spring occurs when
44.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
45.
What does a low pH favor the formation of?
46.
What could happen if the sludge in a sedimentation basin becomes too thick?
47.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
48.
When using chloramines
49.
Solids contact basins have much shorter detention times than conventional treatment basins.
50.
Which is not considered to be a waterborne disease?
51.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
52.
Salts, Bases, and Acids lacking carbon are organic compounds.
53.
In which state are Giardia most vulnerable to inactivation through disinfection?
54.
The structure Diatomaceous Earth filters media is applied to is called?
55.
In the ion exchange softening process, once the resin can no longer soften water it must?
56.
What is the usual effective pH range of iron salt coagulants?
57.
Who can declare the vulnerability of a water source?
58.
As CaCO3 how much alkalinity will dry-basis alum consume?
59.
What is the rule that sets MCL's for harmful chemicals?
60.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
61.
The actions levels for lead and copper are?
62.
At what temperature does the maximum density of water occur?
63.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
64.
What was created to have uniform standards in Water Treatment?
65.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
66.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
67.
Typically, how long is the flash mixing time in the coagulation process?
68.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
69.
What is the MCLG for chloride?
71.
What does not pose a threat to human health in the drinking water?
72.
What is the total concentration of dissolved solids in the wastewater from the regeneration of ion exchange units?
73.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
74.
Impurities that do not dissolve in water and settle out eventually are?
75.
What TON will consumers start to notice?
76.
What organism is associated with taste and odors?
77.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
78.
What is usually used to disinfect the gravel packing of a ground water well?
79.
A pump should always be insatlled?
80.
When a permit is required to enter a confined space, who may sign the permit?
81.
Which natural electrical force keeps colloidal particles apart in water treatment?
82.
Manganese is rarely found in surface waters above a concentration of?
83.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
84.
If there is debris found in the filter bed after backwashing a filter this can indicate?
85.
What is the quantity of dissolved oxygen in water a function of?
86.
Anionic polymers are used as filter aids to agglomerate small floc particles left in the sedimentation basin effluent and make them tougher to avoid?
87.
The proper emergency kit for a 150lb chlorine cylinder is?
88.
Ion exchange processes can typically be used for direct groundwater treatment as long as turbidity and what else have levels that are not excessive?
89.
A water sample that is acidified must have a final water pH of?
90.
A test(s) used to monitor the disinfection processes would be?
91.
What is the pH of a saturated solution of sodium fluoride?
92.
An autoclave will sterilize at
93.
What does a high pH favor the formation of?
94.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
95.
What does it mean when a filter is ripening?
96.
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?
97.
What is the process that is used to concentrate sludge?
98.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
99.
During filtration, what role does the action of straining of suspended particles play?
100.
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.
