Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
The most accurate chlorine residual measurement would be taken with?
2.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
3.
What is the best probable solution if rotifers are visible in finished water?
4.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
5.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
6.
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?
7.
What type of algae would most likely be found in nutrient rich water?
8.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
9.
The most probable cause of a problem with a chlorinator is?
10.
What organism can escape coagulation and then pass through a granular filter?
11.
What effect will an increase in total dissolved solids in water to be treated be?
12.
What forms when you add Alum to turbid water?
13.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
14.
What chemical can be added to the water system to sequester Iron and Manganese?
15.
Why is it important to reduce turbidity?
16.
Which is the most persistent protozoa?
17.
The acronym BAT stands for
18.
As the level of phosphates increase in a new water supply, an operator should?
19.
When the cell division in bacteria has been disrupted, it has been?
20.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
21.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
22.
What is the optimal pH range for the removal of particulate matter when using Alum as a coagulant?
23.
The scattering of light by the particles in finished water is from the turbidity caused by
24.
What will neutralize chlorine?
25.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
26.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
27.
Settled backwash water that is recovered and re-used from a conventional surface water filtration plant should be returned to the beginning of the treatment train.
28.
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?
29.
For alum coagulation of color, what is the correct pH?
30.
Where are the two points on a gravity filter used to measure head loss located?
31.
What is potassium permanganate most effective in?
32.
The process of the build up of corrosion products is known as?
33.
What is measured to determine total alkalinity?
34.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
35.
What is the usual detention time required to produce optimal floc aggregation?
36.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
37.
What is the most important thing to consider in automatic startup after a power failure has occured?
38.
The IDLH (immediately dangerous to life and health) value for chlorine is?
39.
Pathogenic organisms?
40.
Solids contact basins have much shorter detention times than conventional treatment basins.
41.
What type of polymers are sometimes formulated with regulated substances?
42.
What does total alkalinity refer to?
43.
The organism that causes Giardiasis
44.
Which is not considered to be a waterborne disease?
45.
What is the most favorable raw water condition for good flocculation?
46.
Wet activated carbon will remove what from the air? (In regards to safety)
47.
How much does water expand by when it freezes compared to its original value?
48.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
49.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
50.
When treating surface water, the main reason for removing solids is?
