Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
A connection between a potable water system and a non potable water system is?
2.
During filtration, what role does the action of straining of suspended particles play?
3.
What is the pH of a saturated solution of sodium fluoride?
4.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
5.
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?
6.
For alum coagulation of color, what is the correct pH?
7.
Improper backwashing of the filter media can lead to?
8.
In which state are Giardia most vulnerable to inactivation through disinfection?
9.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
10.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
11.
What percentage of solids sludge is produced in the precipitative softening plant?
12.
What chemical oxidant would be most effective for controlling biological growth?
13.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
14.
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?
15.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
16.
An increase in filter media head loss could be an indicator of?
17.
Most regulated contaminants in drinking water?
18.
What is the depression around the well of the water surface caused by pumping water from a well?
19.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
20.
Under the process of safety management, sites are required to do a site assessment if the facility in a single process has more than how many pounds of chlorine?
21.
Ion exchange processes can typically be used for direct groundwater treatment as long as turbidity and what else have levels that are not excessive?
22.
Which of these has the most impact on tastes and odors in water?
23.
What process would be most effective for the destruction of heterotrophic bacteria?
24.
What will occur if the activation process of silica is not carefully controlled?
25.
What is the usual detention time required to produce optimal floc aggregation?
26.
What is the rule that sets MCL's for harmful chemicals?
27.
The Marble test is associated with?
28.
The process by which water becomes a gas and rises is called?
30.
Reaching breakpoint chlorination means?
31.
What does a high pH favor the formation of?
32.
Current regulations require that water treatment wastes be monitored?
33.
Potassium permanganate and manganese greensand are sometimes used to?
34.
Determining the pH is an important water quality test because the results indicate?
35.
What are total dissolved minerals in rainwater typically close to?
36.
The actions levels for lead and copper are?
37.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
38.
What is the most probable solution if nematodes are interfering with the disinfectant?
39.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
40.
What is the minimum angle that self cleaning tube settlers must be placed?
41.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
42.
For surface water systems without filtration, the Surface Water Treatment Rule requires public water systems to
43.
What is the most effective disinfection residual?
44.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
45.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
46.
Even a low concentration of ammonia gas can be fatal to humans if it is at least?
47.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
48.
The maximum safe level of electrical current that will not have any long lasting health effects is?
49.
What tests are performed most frequently in drinking water systems?
50.
The hydrologic cycles create what two primary sources of water?
