Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
What would be the most probable solution to control algae in the source water if the algae is clogging the filters in the water plant?
2.
What gas can cause lung and skin irritation?
3.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
4.
Microorganisms that require dissolved or free oxygen are?
5.
What is the best disinfectant against Cryptosporidium?
6.
What does it mean when a filter is ripening?
7.
What is a similar process to reverse osmosis that uses lower pressures without removing all mineral content?
8.
What causes an increase in taste and odors when natural waters lack DO?
9.
Granular activated carbon is used as?
10.
What water quality indicator should be considered in a lake de-stratification program?
11.
Test results from a multiple tube fermentation test for coliform bacteria are expressed as MPN (most probable number) per 100 milliliters, the number is determined from?
12.
What happens when there is high algae growth in a reservoir?
13.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
14.
The advantage of using oxidant ozone is that it?
15.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
16.
What is dissolved air flotation good for removing?
17.
What would have the least impact on the efficiency of copper sulfate?
18.
Never install a new gasket when a chlorine cylinder or container is changed.
19.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
20.
When treating surface water, the main reason for removing solids is?
21.
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.
22.
What is the process that is used to concentrate sludge?
23.
What does the pulsating energy in a pulsator clarifier help to do?
24.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
25.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
26.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
27.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
28.
A water sample that is acidified must have a final water pH of?
29.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
30.
Which is the best removal method if a well contains soluble iron?
31.
For maximum charge neutralization the average zeta potential should be in what range?
32.
What water quality indicator is of greatest concern in a surface water treatment plant?
33.
A chlorine evaporator maintains a water bath at?
34.
Permanganate reactions are highly dependent on?
35.
What type of algae would most likely be found in nutrient rich water?
36.
What type of sedimentation basins have the flow of water admitted at an angle?
37.
Trihalomethanes (THM's) are primarily a concern in?
38.
What could be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle Valves, and clogging PRV and Surge Control Valves?
39.
What makes chlorine use more advantageous over chloramines?
40.
What laboratory device sterilizes laboratory apparatuses and microbial media by using pressurized steam?
41.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
42.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
43.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
44.
Direct filtration eliminates what conventional treatment step?
45.
What is the typical strength of calcium hypochlorite?
47.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
48.
What is dental fluorosis?
49.
The structure Diatomaceous Earth filters media is applied to is called?
50.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
