Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
2.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
3.
What is a universal solvent?
4.
What zone in a lake or reservoir has weeds that grow underwater that may cause taste & odor complaints?
5.
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?
6.
What are the precursors to THMs?
7.
How is chlorine dioxide formed?
8.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
9.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
10.
Why is turbidity in drinking water undesirable?
11.
In gram staining, part of the coliform verification is?
12.
Alachlor, Lindane, and Toxaphene are examples of?
13.
What is the best addition for water that is highly colored due to organic matter?
14.
Manganese is rarely found in surface waters above a concentration of?
15.
For maximum charge neutralization the average zeta potential should be in what range?
16.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
17.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
18.
If ammonia vapor is passed over a chlorine leak in a cylinder valve, the leak is indicate by
19.
Which is not considered to be a waterborne disease?
20.
HPC and Coliform tests are the same because they both?
21.
Gravity filters should not use more than what percent of daily production for backwash?
22.
The scattering of light by the particles in finished water is from the turbidity caused by
23.
Opening the discharge valve one full turn on a chlorine cylinder will?
25.
Coliform bacteria are classified as?
27.
What should an operator do to compensate for temperature changes in a conventional water treatment plant with dual media filters that has very cold water in the winter and warm water in the summer?
28.
When the cell division in bacteria has been disrupted, it has been?
29.
What chemical is slacked lime?
30.
The more hydrogen ions
31.
What effect will caustic soda (NaOH)have on water?
32.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
34.
What does the operator use to adjust the amount of liquid or gas delivered to water?
35.
All chlorine gas rooms...
36.
What type of self-contained breathing apparatus should be used at water plants?
37.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
38.
Impurities that do not dissolve in water and settle out eventually are?
39.
What percentage of solids sludge is produced in the precipitative softening plant?
40.
For alum coagulation of color, what is the correct pH?
41.
The Marble test is associated with?
42.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
43.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
44.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
45.
Permanganate reactions are highly dependent on?
46.
The factors that effect coagulation and flocculation with alum are
47.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
48.
Acid rain is caused by
49.
Viruses are sometimes resistant to disinfection.
50.
Radon is a radioactive decay daughter of radium 226.
51.
Water impurities that come from plants or animals are
52.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
53.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
54.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
55.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
56.
Water treatment chemicals are added based on?
57.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
58.
Reaching breakpoint chlorination means?
59.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
60.
In which state are Giardia most vulnerable to inactivation through disinfection?
61.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
62.
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?
63.
A test(s) used to monitor the disinfection processes would be?
64.
The injection of fluoride should be as far away as possible from any chemical containing?
65.
River water is not uniform in quality from hour to hour or day to day.
67.
What is the usual detention time required to produce optimal floc aggregation?
68.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
69.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
70.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
71.
What chemical oxidant would be best for controlling the forming of THMs?
72.
What could be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle Valves, and clogging PRV and Surge Control Valves?
73.
When entering a permitted confined space entry structure, always complete a permit and?
74.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
75.
Where do Enteropathogenic organisms in water supplies originate?
76.
What range of temperatures will fusible plugs on chlorine cylinders melt?
77.
What is the most troublesome operating problem for a sedimentation basin?
78.
The structure Diatomaceous Earth filters media is applied to is called?
79.
Organic chemistry is concerned with compounds containing what element?
80.
In what form is Iron soluble in water?
81.
The type of filter that provides the lowest flow per square foot of surface are is?
82.
Records of chemical analyses should be kept for?
83.
The continuous circulation of water from the earth into the atmosphere and back again is called?
84.
What will ion exchange remove?
85.
What sludge dewatering process requires a pre-coat of diatomaceous earth and its use has declined due to other newer methods?
86.
Current regulations require that water treatment wastes be monitored?
87.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
88.
What should the flexible copper tubing be rated at the connects a 150lb chlorine cylinder to a manifold?
89.
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?
90.
Why has magnetic ion exchange resin been developed?
91.
In a thermally stratified reservoir, water located beneath the thermocline may?
92.
What could happen if the sludge in a sedimentation basin becomes too thick?
93.
What does the saturation point of calcium carbonate primarily depend on?
94.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
95.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
96.
The proper emergency kit for a chlorine tanker is?
97.
What precipitates can foul a cation exchange resin?
98.
What is usually used to disinfect the gravel packing of a ground water well?
99.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
100.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
