Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
What water quality indicator should be considered in a lake de-stratification program?
2.
What conventional treatment step is eliminated by direct filtration?
3.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
4.
According to the AWWA, the time period a filter should be used and then replaced is?
5.
Why is it important to reduce turbidity?
6.
Where does most of the carbon dioxide in groundwater originate from?
7.
In gram staining, part of the coliform verification is?
8.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
9.
A pro of chloramines is?
10.
Which of the following composes the majority of scale in pipes?
11.
A composite sample should never be collected for what type of analysis?
12.
In order to prevent air binding in a rapid sand filter, head loss should never exceed?
13.
The continuous circulation of water from the earth into the atmosphere and back again is called?
14.
Chlorine is chosen over chloramines because chlorine?
15.
What test is used to determine the presence of coliform bacteria?
16.
What is the usual effective pH range of iron salt coagulants?
17.
Fine solids that remain suspended in water and will not settle on their own are known as?
18.
Why do operators monitor a filter's operation time, headloss and effluent turbidity level?
19.
What is the only MCL that varies with the temperature?
20.
The fluoride injection point should be located after water has received complete treatment.
21.
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?
22.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
23.
What type of pump is most commonly used to feed chemicals into a water supply?
24.
HPC and Coliform tests are the same because they both?
25.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
26.
What percentage of the air is usually converted to ozone if air is used to generate ozone?
27.
What happens when there is high algae growth in a reservoir?
28.
In which state are Giardia most vulnerable to inactivation through disinfection?
29.
What will neutralize chlorine?
30.
Daily flow rates are limited in a conventional treatment plant due to the detention time needed to settle the floc and its sedimentation basin. What is the time range for the clarifier?
31.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
32.
What water quality indicator is of greatest concern in a surface water treatment plant?
33.
What type of algae would most likely be found in nutrient rich water?
34.
What type of chlorine gas feeder is most commonly used?
35.
How often should the fluoride feed system be checked?
36.
What is the depression around the well of the water surface caused by pumping water from a well?
37.
What does total alkalinity refer to?
38.
What percentage of the earth's surface is covered in water?
39.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
40.
What does a high pH favor the formation of?
41.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
42.
Trihalomethanes (THM's) are primarily a concern in?
43.
What is the most efficient process for the removal of nitrate and nitrate?
44.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
45.
In the ion exchange softening process, once the resin can no longer soften water it must?
46.
A test(s) used to monitor the disinfection processes would be?
47.
The most probable cause of a problem with a chlorinator is?
48.
What factor is used to express the relative volatility of a substance?
49.
Monthly sampling results must be reported by the water purveyor?
50.
What is usually used to disinfect the gravel packing of a ground water well?
