Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Anaerobic conditions in reservoirs can cause what problem?
2.
What emergency kit is for chlorine tank cars?
3.
In the MNO-MUG test the presence of E.coli is indicted by?
4.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
5.
Where do Enteropathogenic organisms in water supplies originate?
6.
What type of sedimentation basins have the flow of water admitted at an angle?
7.
If dry alum and quicklime are mixed together, what will happen?
8.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
9.
The process by which water becomes a gas and rises is called?
10.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
11.
A connection between a potable water system and a non potable water system is?
12.
One of the steps taken to determine the threshold odor number is?
13.
Where are the two points on a gravity filter used to measure head loss located?
14.
Water hardness is measured in equivalent amounts of?
15.
When filter run times between backwashes are long, like one week, because low turbidity water is being applied to the filters, what problem could still arise?
16.
The advantage of using oxidant ozone is that it?
17.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
18.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
19.
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?
20.
What water quality indicator is of greatest concern in a surface water treatment plant?
21.
In the ion exchange softening process, once the resin can no longer soften water it must?
22.
What are the four zones that divide a typical sedimentation basin?
23.
What is the quantity of dissolved oxygen in water a function of?
24.
What type of filtration is permitted under the Surface Water Treatment Rule?
25.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
26.
In a permit entry confined space, who is responsible for terminating entries?
27.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
28.
What organism is associated with taste and odors?
29.
One criteria to avoid filtration is that the fecal coliform concentration must be equal to or less than how many mg/L in representative samples of the source water immediately before the first or only point of disinfectant application in at least what percentage of the measurements made for the previous 6 months that the system served water to the public on an ongoing basis.
30.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
31.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
32.
What is the maximum feed rate when adding fluoride to drinking water?
33.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
34.
What is dental fluorosis?
35.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
36.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
37.
What is the typical strength of calcium hypochlorite?
38.
How does Groundwater differ from Surface water sources?
39.
Free chlorine residual values are based on contact time of at least?
40.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
41.
The most accurate chlorine residual measurement would be taken with?
42.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
43.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
44.
The fluoride injection point should be located after water has received complete treatment.
45.
What is the sample size for lead and copper analysis?
46.
The minimum detention time in a conventional detention basin is?
47.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
48.
Why is water softening a part of the water treatment process?
49.
What type of polymers are sometimes formulated with regulated substances?
50.
What causes water to turn red?
