Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
The chlorine demand with vary with?
2.
The cl2 residual in water may be determined by using the reagent?
3.
In a thermally stratified reservoir, water located beneath the thermocline may?
4.
If dry alum and quicklime are mixed together, what will happen?
5.
Notification to the public of a Tier III violation is done
6.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
7.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
8.
What is the minimum angle that self cleaning tube settlers must be placed?
9.
Filtration rates vary from what of filter surface area?
10.
The maximum sustained flow possible from a well mostly depends on?
11.
During daylight hours, algae growth in a reservoir will do what?
12.
HPC and Coliform tests are the same because they both?
13.
When treating surface water, the main reason for removing solids is?
14.
A connection between a potable water system and a non potable water system is?
15.
What percentage of the earth's surface is covered in water?
16.
What is the cause of temporary hardness?
17.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
18.
Viruses are sometimes resistant to disinfection.
19.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
20.
What does not pose a threat to human health in the drinking water?
21.
If there is a notification of a HazMat spill of an unknown chemical into a stream that provides water to a water treatment plant, what would be the best action taken?
22.
Salts, Bases, and Acids lacking carbon are organic compounds.
23.
Pure water can be found?
24.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
25.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
26.
Which is the method for testing for total coliform bacteria?
27.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
28.
Dissolved-Air flotation is particularly good for?
29.
What type of algae would most likely be found in nutrient rich water?
30.
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?
31.
The backwash rate must be high enough to?
32.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
33.
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?
34.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
35.
Protozoa are larger than bacteria which are larger than viruses.
36.
Trihalomethanes (THM's) are primarily a concern in?
37.
The most accurate chlorine residual measurement would be taken with?
38.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
39.
What precipitates can foul a cation exchange resin?
40.
What is the maximum feed rate when adding fluoride to drinking water?
41.
The disinfection treatment process is?
42.
Once they become fouled, how are reverse osmosis membranes cleaned?
43.
Potassium Permanganate should be?
44.
The injection of fluoride should be as far away as possible from any chemical containing?
45.
Turbidity in the drinking water system can not exceed?
46.
What is the process that is used to concentrate sludge?
47.
When entering a permitted confined space entry structure, always complete a permit and?
48.
Which is the most persistent protozoa?
49.
Pulsator clarifiers are used to?
50.
As CaCO3 how much alkalinity will dry-basis alum consume?
51.
What type of charge do the compounds that form when iron or aluminum salts react with water have?
52.
What will accurately measure 500mL solution?
53.
What occurs in raw water as the level of ammonia decreases?
54.
What forms when you add Alum to turbid water?
56.
What form is Giardia most infectious?
57.
The Surface Water Treatment Rule states that multibarrier treatment must result in the inactivation of Giardia cysts and viruses by?
58.
Where are the two points on a gravity filter used to measure head loss located?
59.
The actions levels for lead and copper are?
60.
During filtration, what role does the action of straining of suspended particles play?
61.
According to the AWWA, the time period a filter should be used and then replaced is?
62.
What is usually used to disinfect the gravel packing of a ground water well?
63.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
64.
An artesian spring occurs when
65.
The size of Giardia in the trophozoite stage is approximately?
66.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
67.
River water is not uniform in quality from hour to hour or day to day.
68.
Which oxidant has the protentional of producing Chlorate (Cl03) by-products?
69.
What could happen if the sludge in a sedimentation basin becomes too thick?
70.
What is the pH of a saturated solution of sodium fluoride?
71.
Anaerobic conditions in reservoirs can cause what problem?
72.
The ion exchange process usually is used to remove what from water?
73.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
74.
What type of pump is most commonly used to feed chemicals into a water supply?
75.
Test results from a multiple tube fermentation test for coliform bacteria are expressed as MPN (most probable number) per 100 milliliters, the number is determined from?
76.
Waterborne diseases like typhoid and cholera are caused by?
77.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
78.
What is measured to determine total alkalinity?
79.
What two principles cause water hardness?
80.
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?
81.
For maximum charge neutralization the average zeta potential should be in what range?
82.
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?
83.
What type of filtration is permitted under the Surface Water Treatment Rule?
84.
The acronym BAT stands for
85.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
86.
At its endpoint, what color does the oxidant potassium permanganate turn?
87.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
88.
A total coliform positive sample must be tested for the presence of?
89.
What test is used to determine the presence of coliform bacteria?
90.
The sampling points located for required sampling of natural radionuclides are located?
91.
How does Groundwater differ from Surface water sources?
92.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
93.
What is the most effective method for the removal of disinfection by products?
94.
When the temperature of raw surface water drops significantly the flocculator paddle speed should be?
95.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
96.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
97.
A method to increase or maintain the DO concentration of a thermally stratified reservoir?
98.
What is the typical strength of calcium hypochlorite?
99.
Regulations require that wastes from water treatment be monitored?
100.
What type of self-contained breathing apparatus should be used at water plants?
