Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
What type of sedimentation basins have the flow of water admitted at an angle?
2.
Where are the two points on a gravity filter used to measure head loss located?
3.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
4.
In the MNO-MUG test the presence of E.coli is indicted by?
5.
What is calcium sulfate also known as?
6.
What precipitates can foul a cation exchange resin?
7.
Potassium permanganate and manganese greensand are sometimes used to?
8.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
9.
When the temperature of raw surface water drops significantly the flocculator paddle speed should be?
10.
What is the best process for removing turbidity?
11.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
12.
What is the most important reason to reduce turbidity?
13.
For alum coagulation of color, what is the correct pH?
14.
In the ion exchange softening process, once the resin can no longer soften water it must?
15.
Viruses are sometimes resistant to disinfection.
16.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
17.
What should be determined first before an in ground sedimentation tank is drained?
18.
If there is a notification of a HazMat spill of an unknown chemical into a stream that provides water to a water treatment plant, what would be the best action taken?
19.
What works best to disinfect cryptosporidium?
20.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
21.
Which is a chemical used in water treatment as a coagulating chemical?
22.
Potassium Permanganate should be?
23.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
24.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
25.
What disinfectant is commonly used and free of Cl2 to avoid THMs?
26.
What effect will an increase in total dissolved solids in water to be treated be?
27.
The loss of chloramine residuals in a water line or a storage tank is due to?
28.
What is the MCLG for chloride?
29.
Coliform bacteria are always?
30.
The chlorine demand with vary with?
31.
What method can be used to control scaling, but is never used to control corrosion?
32.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
33.
The process by which water becomes a gas and rises is called?
34.
Past the breakpoint chlorination point, what percentage of the total chlorine residual should be free chlorine?
35.
What is the most probable solution if nematodes are interfering with the disinfectant?
36.
For maximum charge neutralization the average zeta potential should be in what range?
37.
What water quality indicator is of greatest concern in a surface water treatment plant?
38.
Pure water can be found?
39.
The minimum detention time in a conventional detention basin is?
40.
As the level of phosphates increase in a new water supply, an operator should?
41.
A total coliform positive sample must be tested for the presence of?
42.
What form is the protozoan Giardia Lamblia transmitted in?
43.
Impurities that do not dissolve in water and settle out eventually are?
44.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
45.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
46.
What will cause reverse osmosis membranes to compact faster?
47.
In alum sludge, what is typically the percentage of solid material?
48.
What is the term that defines the calculation of a water plants physical property due wear and tear?
49.
How often should the fluoride concentration be measured in treated water?
50.
When it is dissolved in water for disinfection purposes, how long does ozone last?
