Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Bar screens are used to?
2.
What is the usual detention time required to produce optimal floc aggregation?
3.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
4.
What can be done to prevent discharge cavitation from occurring?
5.
Reaching breakpoint chlorination means?
6.
To regenerate virgin greensand it must be soaked in the filter bed for several hours in a solution of chlorine containing?
7.
Who can declare the vulnerability of a water source?
8.
What is the most effective method for the removal of disinfection by products?
9.
Low temperature water can be compensated for when using Alum by?
10.
Which is the most persistent protozoa?
11.
What is the typical strength of calcium hypochlorite?
12.
Even a low concentration of ammonia gas can be fatal to humans if it is at least?
13.
What works best to disinfect cryptosporidium?
14.
What is the usual range of percent sludge solids, if the sludge is allowed to accumulate and compact at the bottom of a sedimentation basin?
15.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
16.
Chlorine is chosen over chloramines because chlorine?
17.
Nitrification in the distribution system can best be described as?
18.
What range of temperatures will fusible plugs on chlorine cylinders melt?
19.
During filtration, what role does the action of straining of suspended particles play?
20.
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.
21.
Backflow wash flows should expand filter media by?
22.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
23.
What device collects the settled water as it leaves the sedimentation basin?
24.
Which is the best removal method if a well contains soluble iron?
25.
The advantage of using oxidant ozone is that it?
26.
In alum sludge, what is typically the percentage of solid material?
27.
What is the MCL for HAA5s?
28.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
29.
A chlorine evaporator maintains a water bath at?
30.
What is the most probable solution if nematodes are interfering with the disinfectant?
31.
What is the most important reason to reduce turbidity?
32.
What membrane process is used to treat brackish water or seawater?
33.
How much does water expand by when it freezes compared to its original value?
34.
What does the saturation point of calcium carbonate primarily depend on?
35.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
36.
Once they become fouled, how are reverse osmosis membranes cleaned?
37.
What occurs in raw water as the level of ammonia decreases?
38.
What does the operator use to adjust the amount of liquid or gas delivered to water?
39.
What type of chlorine gas feeder is most commonly used?
40.
What causes water to turn red?
41.
If the water temperature decreases this will cause the disinfection action of chlorine to?
42.
A total coliform positive sample must be tested for the presence of?
43.
Coagulation is a chemical and physical reaction that converts?
44.
The most accurate chlorine residual measurement would be taken with?
45.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
46.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
47.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
48.
The Surface Water Treatment Rule states that multibarrier treatment must result in the inactivation of Giardia cysts and viruses by?
49.
What is the primary drawback for facilities that use ultra violet light to disinfect water?
50.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
