Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
2.
When treating surface water, the main reason for removing solids is?
3.
Chlorine is chosen over chloramines because chlorine?
4.
As CaCO3 how much alkalinity will dry-basis alum consume?
5.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
6.
In what form is Iron soluble in water?
7.
Acid rain is caused by
8.
If there is gravel displacement in a filter bed from backwash rates with too high of a velocity, could eventually cause?
9.
What disinfectant is commonly used and free of Cl2 to avoid THMs?
10.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
11.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
12.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
13.
The factors that effect coagulation and flocculation with alum are
14.
River water is not uniform in quality from hour to hour or day to day.
15.
What is calcium sulfate also known as?
16.
How often should the fluoride feed system be checked?
17.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
18.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
19.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
20.
A pump should always be insatlled?
21.
What sludge dewatering process requires a pre-coat of diatomaceous earth and its use has declined due to other newer methods?
22.
Alachlor, Lindane, and Toxaphene are examples of?
23.
In alum sludge, what is typically the percentage of solid material?
24.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
25.
An artesian spring occurs when
26.
Which is the most persistent protozoa?
27.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
28.
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?
29.
What type of polymers are sometimes formulated with regulated substances?
30.
What parameter must be much better than conventional treatment basins in basins using tube and plate settlers?
31.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
32.
What makes chlorine use more advantageous over chloramines?
33.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
34.
Granular activated carbon is used as?
35.
The organism that causes Giardiasis
36.
What national law regulates underground disposal of wastes in deep wells?
37.
At minimum, the Surface Water Treatment Rule requires surface water users to use what two treatment methods?
38.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
39.
Notification to the public of a Tier III violation is done
40.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
41.
Which process helps remove contaminants in water by causing them to cling to the surface of certain filter grains?
42.
What emergency kit is for chlorine tank cars?
43.
What occurs in raw water as the level of ammonia decreases?
44.
Most regulated contaminants in drinking water?
45.
When entering a permitted confined space entry structure, always complete a permit and?
46.
What is the specific gravity standard for gases?
47.
Where are samples taken for lead and copper?
48.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
49.
Microorganisms that require dissolved or free oxygen are?
50.
Solids contact basins have much shorter detention times than conventional treatment basins.
51.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
52.
When using the lime soda ash process, it is impossible to produce water with a hardness of less than?
53.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
54.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
55.
What will accurately measure 500mL solution?
57.
What test is used to determine the presence of coliform bacteria?
58.
What does a low pH favor the formation of?
59.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
60.
The advantage of using oxidant ozone is that it?
61.
Turbidity in the drinking water system can not exceed?
62.
Why are check valves installed in suction lines?
63.
Protozoa that must be removed from raw water are?
64.
What does the saturation point of calcium carbonate primarily depend on?
65.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
66.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
67.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
68.
Regulations require that wastes from water treatment be monitored?
69.
What is a major cause of short circuiting in a sedimentation basin?
70.
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?
71.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
72.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
73.
Pulsator clarifiers are used to?
74.
How is chlorine dioxide formed?
75.
Detention time in flocculation basins are usually designed to provide for?
76.
What could happen if the sludge in a sedimentation basin becomes too thick?
77.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
78.
What are different types of media used to filter water for human consumption?
79.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
80.
What is a hypochlorinator used for?
81.
The proper emergency kit for a 150lb chlorine cylinder is?
82.
The maximum safe level of electrical current that will not have any long lasting health effects is?
83.
What is the most efficient process for the removal of nitrate and nitrate?
84.
What type of algae would most likely be found in nutrient rich water?
85.
Why has magnetic ion exchange resin been developed?
86.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
87.
What TON will consumers start to notice?
88.
Under the process of safety management, sites are required to do a site assessment if the facility in a single process has more than how many pounds of chlorine?
89.
The injection of fluoride should be as far away as possible from any chemical containing?
90.
Filtration rates vary from what of filter surface area?
91.
The more hydrogen ions
92.
What precipitates can foul a cation exchange resin?
93.
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?
94.
What is the most effective method for removing tastes and odors?
95.
What is used for detection of chlorine gas leaks?
96.
What is dissolved air flotation good for removing?
97.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
98.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
99.
If a rapid gravity filter is well operated, the finished water will have?
100.
What effect will an increase in total dissolved solids in water to be treated be?
