Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
2.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
3.
What laboratory device sterilizes laboratory apparatuses and microbial media by using pressurized steam?
4.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
5.
Protozoa are larger than bacteria which are larger than viruses.
6.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
7.
In the ion exchange softening process, once the resin can no longer soften water it must?
8.
During daylight hours, algae growth in a reservoir will do what?
9.
To unclog the head of a chemical feed pump an operator should first?
10.
Community water systems must check the natural radioactivity in their water supply at least?
11.
How often should the fluoride concentration be measured in treated water?
12.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
13.
What device collects the settled water as it leaves the sedimentation basin?
14.
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?
15.
What process change be should be done if the level of turbidity in raw water decreased from 7 to 3 NTUs?
16.
The Surface Water Treatment Rule states that multibarrier treatment must result in the inactivation of Giardia cysts and viruses by?
17.
At minimum, the Surface Water Treatment Rule requires surface water users to use what two treatment methods?
18.
During filtration, what role does the action of straining of suspended particles play?
19.
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?
20.
What unit process will diatoms most likely replace?
21.
What is the term that defines the calculation of a water plants physical property due wear and tear?
22.
What is the total concentration of dissolved solids in the wastewater from the regeneration of ion exchange units?
23.
What gas can cause lung and skin irritation?
24.
What makes chlorine use more advantageous over chloramines?
25.
What is the most troublesome operating problem for a sedimentation basin?
26.
A water sample that is acidified must have a final water pH of?
27.
Potassium Permanganate should be?
28.
The type of filter that provides the lowest flow per square foot of surface are is?
29.
When using chloramines
30.
What does not pose a threat to human health in the drinking water?
31.
What will occur if the activation process of silica is not carefully controlled?
32.
According to the AWWA, the time period a filter should be used and then replaced is?
33.
What will accurately measure 500mL solution?
34.
Pathogenic organisms?
35.
What is the cause of temporary hardness?
36.
What does total alkalinity refer to?
37.
The most accurate chlorine residual measurement would be taken with?
38.
Protozoa that must be removed from raw water are?
39.
At what temperature does the maximum density of water occur?
40.
Pure water can be found?
41.
Adding CO2 to water will?
42.
What is usually used to disinfect the gravel packing of a ground water well?
43.
The cl2 residual in water may be determined by using the reagent?
44.
Low temperature water can be compensated for when using Alum by?
45.
What is the pH of a saturated solution of sodium fluoride?
46.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
47.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
48.
What is measured to determine total alkalinity?
49.
A test(s) used to monitor the disinfection processes would be?
50.
A chlorine evaporator maintains a water bath at?
51.
What is the MCL for HAA5s?
52.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
53.
Gravity filters should not use more than what percent of daily production for backwash?
54.
What is the best process for removing turbidity?
55.
What works best to disinfect cryptosporidium?
56.
If dry alum and quicklime are mixed together, what will happen?
57.
Why is turbidity in drinking water undesirable?
58.
What does a low pH favor the formation of?
59.
A pro of chloramines is?
60.
What does the saturation point of calcium carbonate primarily depend on?
61.
The organism that causes Giardiasis
62.
In the MNO-MUG test the presence of E.coli is indicted by?
63.
What is the principle form of alkalinity found in raw water from both surface and ground sources?
64.
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?
65.
What will cause reverse osmosis membranes to compact faster?
66.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
67.
What is the usual effective pH range of iron salt coagulants?
68.
When the cell division in bacteria has been disrupted, it has been?
69.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
70.
The most probable cause of a problem with a chlorinator is?
71.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
72.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
73.
What will neutralize chlorine?
74.
What could happen if the sludge in a sedimentation basin becomes too thick?
75.
What should be determined first before an in ground sedimentation tank is drained?
76.
Free chlorine residual values are based on contact time of at least?
77.
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.
78.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
79.
Granular activated carbon is used as?
80.
Once they become fouled, how are reverse osmosis membranes cleaned?
81.
The proper emergency kit for a 150lb chlorine cylinder is?
82.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
83.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
84.
Never install a new gasket when a chlorine cylinder or container is changed.
85.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
86.
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?
87.
Giardia Lamblia is transmitted?
88.
What is the pH range of sodium hypochlorite?
89.
What is dental fluorosis?
90.
The disinfection treatment process is?
91.
Potassium permanganate and manganese greensand are sometimes used to?
92.
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?
93.
Water impurities that come from plants or animals are
94.
As the level of phosphates increase in a new water supply, an operator should?
95.
Most totalizer meters at treatment plants are commonly
96.
Organic chemistry is concerned with compounds containing what element?
97.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
98.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
99.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
100.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
