Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
The monitoring program that checks for Benzene (Leaking Underground Storage Tank) is checking for what kind of chemical contaminant?
2.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
3.
Why is turbidity in drinking water undesirable?
4.
What national law regulates underground disposal of wastes in deep wells?
5.
Which of the following illnesses is it hardest to kill the organism that causes the illness?
6.
Coagulation is a chemical and physical reaction that converts?
7.
What oxidant has a potential of producing ClO3 by products?
8.
What is used for detection of chlorine gas leaks?
9.
One of the steps taken to determine the threshold odor number is?
10.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
11.
Reaching breakpoint chlorination means?
12.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
13.
Adding CO2 to water will?
14.
Past the breakpoint chlorination point, what percentage of the total chlorine residual should be free chlorine?
15.
Backflow wash flows should expand filter media by?
16.
The outlet of a forced ventilation system for a chlorinator room she be located?
17.
The disinfection treatment process is?
18.
Recovered backwash water from a conventional surface water filtration plant may be returned to the headworks if allowed under?
19.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
20.
Who can declare the vulnerability of a water source?
21.
Turbidity in the drinking water system can not exceed?
22.
An increase in filter media head loss could be an indicator of?
23.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
24.
What do long filter runs tend to cause?
25.
What is usually used to disinfect the gravel packing of a ground water well?
26.
An autoclave will sterilize at
27.
Notification to the public of a Tier III violation is done
28.
The proper emergency kit for a TON chlorine cylinder is?
29.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
30.
Radon is a radioactive decay daughter of radium 226.
31.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
32.
What is put in place in a reservoir to create an even flow rate through the entire volume of a clearwell to provide a consistent amount of detention time and minimize short-circuiting?
33.
What factor is used to express the relative volatility of a substance?
34.
The process of the build up of corrosion products is known as?
35.
What chemical is slacked lime?
36.
The proper emergency kit for a 150lb chlorine cylinder is?
37.
What should be determined first before an in ground sedimentation tank is drained?
38.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
39.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
40.
A common chemical added to boost alkalinity is?
41.
What type of filtration is permitted under the Surface Water Treatment Rule?
42.
What is measured to determine total alkalinity?
43.
The maximum sustained flow possible from a well mostly depends on?
44.
Improper backwashing of the filter media can lead to?
45.
Impurities found in water that do not come from plants or animals are
46.
What organism is associated with taste and odors?
47.
Monthly sampling results must be reported by the water purveyor?
48.
At what temperature does the maximum density of water occur?
49.
What is recarbonation?
51.
At its endpoint, what color does the oxidant potassium permanganate turn?
52.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
53.
The maximum safe level of electrical current that will not have any long lasting health effects is?
55.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
56.
According to the AWWA, the time period a filter should be used and then replaced is?
57.
The organism that causes Giardiasis
58.
What conditions will +Eh values of water support?
59.
The porous material just above the water table that holds small quantities of water by capillary action is called?
60.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
61.
Ozone contractors must have a system to collect ozone off-gas because?
62.
Filtration rates vary from what of filter surface area?
63.
What is the motion called for the particles in water that are in constant motion and work in conjunction with the destabilization process to create floc?
64.
What will accurately measure 500mL solution?
65.
A constituent dissolved in source water that will precipitate when oxidized is?
66.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
67.
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?
68.
Detention time in flocculation basins are usually designed to provide for?
69.
In a thermally stratified reservoir, water located beneath the thermocline may?
70.
What happens when there is high algae growth in a reservoir?
71.
If a rapid gravity filter is well operated, the finished water will have?
72.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
73.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
74.
A chlorine evaporator maintains a water bath at?
75.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
76.
The temperature range at which coliform bacteria samples must be stored before being delivered to a lab is?
77.
The cl2 residual in water may be determined by using the reagent?
78.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
79.
What is the MCL for HAA5s?
80.
When the temperature of raw surface water drops significantly the flocculator paddle speed should be?
81.
An artesian spring occurs when
82.
What precipitates can foul a cation exchange resin?
83.
Which process helps remove contaminants in water by causing them to cling to the surface of certain filter grains?
84.
What type of chlorine gas feeder is most commonly used?
85.
What is the main problem if particle agglomeration is occurring in a filter for iron and manganese removal at the interface of the coal layer below?
86.
What type of algae would most likely be found in nutrient rich water?
87.
What chemical may encourage growth of algae and microorganisms?
88.
When soda ash is added to water for softening purposes what will it do?
89.
Why has magnetic ion exchange resin been developed?
90.
What effect will an increase in total dissolved solids in water to be treated be?
91.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
92.
What is the pH range of sodium hypochlorite?
93.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
94.
The size of Giardia in the trophozoite stage is approximately?
95.
During daylight hours, algae growth in a reservoir will do what?
96.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
97.
The most probable cause of a problem with a chlorinator is?
98.
Giardia Lamblia is transmitted?
99.
Which is a chemical used in water treatment as a coagulating chemical?
100.
What is the process that is used to concentrate sludge?
