Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What is the most important reason to reduce turbidity?
2.
All chlorine gas rooms...
3.
What should the flexible copper tubing be rated at the connects a 150lb chlorine cylinder to a manifold?
4.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
5.
When must a water system collect annual samples if the water system has been determined to be reliable by the State and consistently below the MCL level for organic compounds?
6.
What process would be most effective for the destruction of heterotrophic bacteria?
7.
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?
8.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
9.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
10.
When soda ash is added to water for softening purposes what will it do?
11.
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?
12.
What is used to prevent water from entering a gas chlorinator?
13.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
14.
Viruses are sometimes resistant to disinfection.
15.
Detention time in flocculation basins are usually designed to provide for?
17.
Pulsator clarifiers are used to?
18.
The sampling points located for required sampling of natural radionuclides are located?
19.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
20.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
21.
When it is dissolved in water for disinfection purposes, how long does ozone last?
22.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
23.
What is the best process for removing turbidity?
24.
Which is classified as a secondary contaminant?
25.
Acid rain is caused by
26.
Plant growth in a reservoir will usually be found at a depth of?
27.
Which is a chemical used in water treatment as a coagulating chemical?
28.
Alachlor, Lindane, and Toxaphene are examples of?
29.
Typically, how long is the flash mixing time in the coagulation process?
30.
What two principles cause water hardness?
31.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
32.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
33.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
34.
The size of Giardia in the trophozoite stage is approximately?
35.
Why are check valves installed in suction lines?
36.
What is the rule that sets MCL's for harmful chemicals?
37.
To unclog the head of a chemical feed pump an operator should first?
38.
The proper emergency kit for a 150lb chlorine cylinder is?
39.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
40.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
41.
What is the most important thing to consider in automatic startup after a power failure has occured?
42.
What will ion exchange remove?
43.
What does the saturation point of calcium carbonate primarily depend on?
44.
What type of filtration is permitted under the Surface Water Treatment Rule?
45.
Free chlorine residual values are based on contact time of at least?
46.
According to the AWWA, the time period a filter should be used and then replaced is?
47.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
48.
River water is not uniform in quality from hour to hour or day to day.
49.
What does it mean when a filter is ripening?
50.
How does Groundwater differ from Surface water sources?
51.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
52.
The cl2 residual in water may be determined by using the reagent?
53.
Past the breakpoint chlorination point, what percentage of the total chlorine residual should be free chlorine?
54.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
55.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
56.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
57.
The actions levels for lead and copper are?
58.
If a rapid gravity filter is well operated, the finished water will have?
59.
Reaching breakpoint chlorination means?
60.
When treating surface water, the main reason for removing solids is?
61.
What does the pulsating energy in a pulsator clarifier help to do?
62.
A constituent dissolved in source water that will precipitate when oxidized is?
64.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
65.
What is the only MCL that varies with the temperature?
66.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
67.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
68.
What was created to have uniform standards in Water Treatment?
70.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
71.
Coliform bacteria are always?
72.
What type of pump is most commonly used to feed chemicals into a water supply?
73.
Filter alum and polymer compounds are primarily
74.
What is the best process for sequestering manganese?
75.
What water quality indicator is of greatest concern in a surface water treatment plant?
76.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
77.
The action level for copper is 0.015 mg/L.
78.
Current regulations require that water treatment wastes be monitored?
79.
What is the sample size for lead and copper analysis?
80.
The chlorine demand with vary with?
81.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
82.
Potassium permanganate and manganese greensand are sometimes used to?
83.
If there is debris found in the filter bed after backwashing a filter this can indicate?
84.
What is calcium sulfate also known as?
85.
An artesian spring occurs when
86.
Coagulation occurs during the first
87.
Which is not considered to be a waterborne disease?
88.
If the water temperature decreases this will cause the disinfection action of chlorine to?
89.
Which is the method for testing for total coliform bacteria?
90.
What range of temperatures will fusible plugs on chlorine cylinders melt?
91.
In gram staining, part of the coliform verification is?
92.
What will accurately measure 500mL solution?
93.
What is a universal solvent?
94.
What laboratory device sterilizes laboratory apparatuses and microbial media by using pressurized steam?
95.
The process by which water becomes a gas and rises is called?
96.
If a water system collects at least 40 samples per month for total coliform analysis, no more than 20% of samples can come back positive.
97.
What is the principle form of alkalinity found in raw water from both surface and ground sources?
98.
Microorganisms that require dissolved or free oxygen are?
99.
Even a low concentration of ammonia gas can be fatal to humans if it is at least?
100.
The disinfection treatment process is?
