Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What is a major cause of short circuiting in a sedimentation basin?
2.
What is recarbonation?
3.
The maximum sustained flow possible from a well mostly depends on?
4.
A test(s) used to monitor the disinfection processes would be?
5.
Permanganate reactions are highly dependent on?
6.
For surface water systems without filtration, the Surface Water Treatment Rule requires public water systems to
7.
What is the rule that sets MCL's for harmful chemicals?
8.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
9.
The proper emergency kit for a 150lb chlorine cylinder is?
10.
Coliform bacteria are always?
11.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
12.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
13.
What will occur if the activation process of silica is not carefully controlled?
14.
In a saturator tank for flows of less than 100 gpm, how thick should the layer be maintained of sodium fluoride crystals?
15.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
16.
What does a low pH favor the formation of?
17.
When treating surface water, the main reason for removing solids is?
18.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
19.
Detention time in flocculation basins are usually designed to provide for?
20.
Backflow wash flows should expand filter media by?
21.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
22.
What type of polymers are sometimes formulated with regulated substances?
23.
Salts, Bases, and Acids lacking carbon are organic compounds.
24.
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?
25.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
26.
What is the most effective method for removing tastes and odors?
27.
A water molecule is made up of ?
28.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
29.
What can be done to prevent discharge cavitation from occurring?
30.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
31.
What causes water to turn red?
32.
Turbidity in the drinking water system can not exceed?
33.
Plant growth in a reservoir will usually be found at a depth of?
34.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
35.
What would have the least impact on the efficiency of copper sulfate?
36.
What is the definition of decant?
37.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
38.
If a rapid gravity filter is well operated, the finished water will have?
39.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
40.
The outlet of a forced ventilation system for a chlorinator room she be located?
42.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
43.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
44.
Where does most of the carbon dioxide in groundwater originate from?
45.
What organism can escape coagulation and then pass through a granular filter?
46.
The upper surface of the zone of saturation of ground water in an unconfined aquifer is called the?
47.
When entering a permitted confined space entry structure, always complete a permit and?
48.
Determining the pH is an important water quality test because the results indicate?
49.
What chemical could cause pink water problems?
50.
What gas can cause lung and skin irritation?
51.
Microorganisms that require dissolved or free oxygen are?
52.
How is chlorine dioxide formed?
53.
How often should the fluoride concentration be measured in treated water?
54.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
55.
What is the most effective method for the removal of disinfection by products?
56.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
57.
What is the usual detention time required to produce optimal floc aggregation?
58.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
59.
Waterborne diseases like typhoid and cholera are caused by?
60.
Wet activated carbon will remove what from the air? (In regards to safety)
61.
The pH scale ranges from?
62.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
63.
Which of these has the most impact on tastes and odors in water?
64.
As CaCO3 how much alkalinity will dry-basis alum consume?
65.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
66.
The most probable cause of a problem with a chlorinator is?
67.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
68.
What is the most important reason to reduce turbidity?
69.
When using the lime soda ash process, it is impossible to produce water with a hardness of less than?
70.
Dissolved-Air flotation is particularly good for?
71.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
72.
What water quality indicator is of greatest concern in a surface water treatment plant?
73.
Which is the strongest disinfectant?
74.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
75.
What is the most probable solution if nematodes are interfering with the disinfectant?
76.
What type of filtration is permitted under the Surface Water Treatment Rule?
77.
What do long filter runs tend to cause?
78.
Which is a chemical used in water treatment as a coagulating chemical?
79.
What should be determined first before an in ground sedimentation tank is drained?
80.
What tests are performed most frequently in drinking water systems?
81.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
82.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
83.
What type of algae would most likely be found in nutrient rich water?
84.
Most totalizer meters at treatment plants are commonly
85.
What type of pump is most commonly used to feed chemicals into a water supply?
86.
What is used for detection of chlorine gas leaks?
87.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
88.
Where are the two points on a gravity filter used to measure head loss located?
89.
What chemicals are used to substitute chlorine as pre-oxidants to minimize the formation of disinfection byproducts in a water plant?
90.
The more hydroxide ions
91.
Records of sanitary surveys must be kept for?
92.
What type of chlorine gas feeder is most commonly used?
93.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
94.
What process would be most effective for the destruction of heterotrophic bacteria?
95.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
96.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
97.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
98.
Why has magnetic ion exchange resin been developed?
99.
Improper backwashing of the filter media can lead to?
100.
What range of temperatures will fusible plugs on chlorine cylinders melt?
