Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
2.
During daylight hours, algae growth in a reservoir will do what?
4.
A composite sample should never be collected for what type of analysis?
5.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
6.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
7.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
8.
What is the most favorable raw water condition for good flocculation?
9.
What makes chlorine use more advantageous over chloramines?
10.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
11.
What are the precursors to THMs?
12.
What is the best probable solution if rotifers are visible in finished water?
13.
What is the usual range of percent sludge solids, if the sludge is allowed to accumulate and compact at the bottom of a sedimentation basin?
14.
Impurities that do not dissolve in water and settle out eventually are?
15.
The outlet of a forced ventilation system for a chlorinator room she be located?
16.
Wet activated carbon will remove what from the air? (In regards to safety)
18.
Water impurities that come from plants or animals are
19.
What is recarbonation?
20.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
21.
What does it mean if there are sand boils on the surfaces of rapid sand filters during backwash?
22.
What could happen if the sludge in a sedimentation basin becomes too thick?
23.
What is the specific gravity standard for gases?
24.
What will cause reverse osmosis membranes to compact faster?
25.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
26.
The sampling points located for required sampling of natural radionuclides are located?
27.
What is the MCL for HAA5s?
28.
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when there is?
29.
What form is the protozoan Giardia Lamblia transmitted in?
30.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
31.
Water treatment chemicals are added based on?
32.
Never install a new gasket when a chlorine cylinder or container is changed.
33.
To regenerate virgin greensand it must be soaked in the filter bed for several hours in a solution of chlorine containing?
34.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
35.
A connection between a potable water system and a non potable water system is?
36.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
37.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
38.
What is the motion called for the particles in water that are in constant motion and work in conjunction with the destabilization process to create floc?
39.
The backwash rate must be high enough to?
40.
Solids contact basins have much shorter detention times than conventional treatment basins.
41.
What is the most advantageous application point for powdered activated carbon?
42.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
43.
Which is classified as a secondary contaminant?
44.
What water quality indicator should be considered in a lake de-stratification program?
45.
River water is not uniform in quality from hour to hour or day to day.
46.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
47.
Ozone contractors must have a system to collect ozone off-gas because?
48.
If the water temperature decreases this will cause the disinfection action of chlorine to?
49.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
50.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
51.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
52.
The cl2 residual in water may be determined by using the reagent?
53.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
54.
What type of sedimentation basins have the flow of water admitted at an angle?
55.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
56.
What is the maximum feed rate when adding fluoride to drinking water?
57.
What type of polymers are sometimes formulated with regulated substances?
58.
A constituent dissolved in source water that will precipitate when oxidized is?
59.
What should the an above ground raw water source be tested for if a water plant gets its water from a river that is subject to a cattle feed lot where water runs off?
60.
When soda ash is added to water for softening purposes what will it do?
61.
Permanganate reactions are highly dependent on?
62.
Radon is a radioactive decay daughter of radium 226.
63.
What is the main purpose for adding coagulant chemicals to raw water?
64.
Detention time in flocculation basins are usually designed to provide for?
65.
What would have the least impact on the efficiency of copper sulfate?
66.
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?
67.
At its endpoint, what color does the oxidant potassium permanganate turn?
68.
Recovered backwash water from a conventional surface water filtration plant may be returned to the headworks if allowed under?
69.
What are different types of media used to filter water for human consumption?
71.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
72.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
73.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
74.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
75.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
76.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
77.
The Marble test is associated with?
78.
Current regulations require that water treatment wastes be monitored?
79.
The most accurate chlorine residual measurement would be taken with?
80.
What is measured to determine total alkalinity?
81.
What will increase alkalinity, pH, and hardness?
82.
The more hydrogen ions
83.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
84.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
85.
What conditions will +Eh values of water support?
86.
What is usually used to disinfect the gravel packing of a ground water well?
87.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
88.
What was created to have uniform standards in Water Treatment?
89.
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?
90.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
91.
What will accurately measure 500mL solution?
92.
A total coliform positive sample must be tested for the presence of?
93.
Pathogenic organisms?
94.
What chemical oxidant is most effective in reducing the concentration of taste and odor compounds caused by actinomycetes species?
95.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
96.
What effect will an increase in total dissolved solids in water to be treated be?
97.
The chlorine demand with vary with?
98.
According to the AWWA, the time period a filter should be used and then replaced is?
99.
Why is it important to reduce turbidity?
100.
Coagulation is a chemical and physical reaction that converts?
