Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
2.
Reaching breakpoint chlorination means?
3.
What is put in place in a reservoir to create an even flow rate through the entire volume of a clearwell to provide a consistent amount of detention time and minimize short-circuiting?
4.
Current regulations require that water treatment wastes be monitored?
5.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
6.
When a permit is required to enter a confined space, who may sign the permit?
7.
Recovered backwash water from a conventional surface water filtration plant may be returned to the headworks if allowed under?
8.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
9.
What is calcium sulfate also known as?
10.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
11.
The IDLH (immediately dangerous to life and health) value for chlorine is?
12.
What is the specific gravity standard for gases?
13.
Determining the pH is an important water quality test because the results indicate?
14.
What is a major cause of short circuiting in a sedimentation basin?
15.
What gas can cause lung and skin irritation?
16.
Which is a chemical used in water treatment as a coagulating chemical?
17.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
18.
The loss of chloramine residuals in a water line or a storage tank is due to?
19.
What effect will caustic soda (NaOH)have on water?
20.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
21.
A composite sample should never be collected for what type of analysis?
22.
A chlorine evaporator maintains a water bath at?
23.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
24.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
25.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
26.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
27.
What is the process that is used to concentrate sludge?
28.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
29.
For maximum charge neutralization the average zeta potential should be in what range?
30.
How often should the fluoride feed system be checked?
31.
The size of Giardia in the trophozoite stage is approximately?
32.
What parameter must be much better than conventional treatment basins in basins using tube and plate settlers?
33.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
34.
What is usually used to disinfect the gravel packing of a ground water well?
35.
Free chlorine residual values are based on contact time of at least?
36.
What works best to disinfect cryptosporidium?
37.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
38.
What would have the least impact on the efficiency of copper sulfate?
39.
When the cell division in bacteria has been disrupted, it has been?
40.
A constituent dissolved in source water that will precipitate when oxidized is?
41.
The hydrologic cycles create what two primary sources of water?
42.
In alum sludge, what is typically the percentage of solid material?
43.
What will accurately measure 500mL solution?
44.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
45.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
46.
If ammonia vapor is passed over a chlorine leak in a cylinder valve, the leak is indicate by
47.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
48.
What is the usual detention time required to produce optimal floc aggregation?
49.
Past the breakpoint chlorination point, what percentage of the total chlorine residual should be free chlorine?
50.
The process by which water becomes a gas and rises is called?
