Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
2.
What adverse effects does the secondary contaminant manganese have?
4.
During filtration, what role does the action of straining of suspended particles play?
5.
What is a major cause of short circuiting in a sedimentation basin?
6.
What chemical can be added to the water system to sequester Iron and Manganese?
7.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
8.
What changes does an operator need to make when there are issues with floc formation?
9.
Who can declare the vulnerability of a water source?
10.
Adding CO2 to water will?
11.
When using chloramines
12.
A public water system that can not meet the required removal of TOC can comply if the source water TOC level is what, calculated quarterly as a running annual average.
13.
The proper emergency kit for a chlorine tanker is?
14.
Free chlorine residual values are based on contact time of at least?
15.
The backwash rate must be high enough to?
16.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
17.
In a thermally stratified reservoir, water located beneath the thermocline may?
18.
Filtration rates vary from what of filter surface area?
19.
The sampling points located for required sampling of natural radionuclides are located?
20.
When should polyphosphates used for sequestration of iron and manganese from a well be injected?
21.
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?
22.
How often should the fluoride feed system be checked?
23.
When a permit is required to enter a confined space, who may sign the permit?
24.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
25.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
26.
A chlorine evaporator maintains a water bath at?
27.
The most accurate chlorine residual measurement would be taken with?
28.
What forms when you add Alum to turbid water?
29.
What do long filter runs tend to cause?
30.
What is the best disinfectant against Cryptosporidium?
31.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
32.
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?
33.
When treating surface water, the main reason for removing solids is?
34.
When must a water system collect annual samples if the water system has been determined to be reliable by the State and consistently below the MCL level for organic compounds?
35.
Viruses are sometimes resistant to disinfection.
36.
What is the most effective disinfection residual?
37.
What type of polymers are sometimes formulated with regulated substances?
38.
Which is the strongest disinfectant?
39.
What is the most troublesome operating problem for a sedimentation basin?
40.
What is the pH range of sodium hypochlorite?
41.
What occurs in raw water as the level of ammonia decreases?
42.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
43.
Potassium Permanganate should be?
44.
The actions levels for lead and copper are?
45.
The hydrologic cycles create what two primary sources of water?
46.
What is measured to determine total alkalinity?
47.
What angle should the parallel inclined plates be installed when using the shallow depth sedimentation method?
48.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
49.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
50.
Monthly sampling results must be reported by the water purveyor?
51.
What type of charge do the compounds that form when iron or aluminum salts react with water have?
52.
To unclog the head of a chemical feed pump an operator should first?
53.
What device collects the settled water as it leaves the sedimentation basin?
54.
Once they become fouled, how are reverse osmosis membranes cleaned?
55.
Notification to the public of a Tier III violation is done
56.
What range of temperatures will fusible plugs on chlorine cylinders melt?
57.
Trihalomethanes (THM's) are primarily a concern in?
58.
What is the MCL for HAA5s?
59.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
60.
What is the depression around the well of the water surface caused by pumping water from a well?
61.
Which of the following illnesses is it hardest to kill the organism that causes the illness?
62.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
63.
If there is debris found in the filter bed after backwashing a filter this can indicate?
64.
The maximum safe level of electrical current that will not have any long lasting health effects is?
65.
The loss of chloramine residuals in a water line or a storage tank is due to?
66.
Coagulation is a chemical and physical reaction that converts?
67.
What causes an increase in taste and odors when natural waters lack DO?
68.
Water treatment chemicals are added based on?
69.
What can be done to prevent discharge cavitation from occurring?
70.
Water that is softened has a high pH and a high concentration of CaCO3. Therefore stabilization is essential in order to prevent the CaCO3 from precipitating out on?
71.
The type of filter that provides the lowest flow per square foot of surface are is?
72.
Dissolved-Air flotation is particularly good for?
73.
What parameter must be much better than conventional treatment basins in basins using tube and plate settlers?
74.
What zone in a lake or reservoir has weeds that grow underwater that may cause taste & odor complaints?
75.
The factors that effect coagulation and flocculation with alum are
76.
What is the main purpose for adding coagulant chemicals to raw water?
77.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
78.
What does not pose a threat to human health in the drinking water?
79.
What method can be used to control scaling, but is never used to control corrosion?
80.
The proper emergency kit for a TON chlorine cylinder is?
81.
Gravity filters should not use more than what percent of daily production for backwash?
82.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
83.
A test(s) used to monitor the disinfection processes would be?
84.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
85.
What should be determined first before an in ground sedimentation tank is drained?
86.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
87.
Which is a chemical used in water treatment as a coagulating chemical?
88.
What is an inorganic particle that is stabilized in water by attracting a layer of oppositely charged ions surrounded by a diffuse layer of counterions?
89.
Which is the most persistent protozoa?
90.
A water molecule is made up of ?
91.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
92.
What type of chlorine gas feeding equipment would be most appropriate for distribution systems where re-chlorination is required?
93.
What does the pulsating energy in a pulsator clarifier help to do?
94.
Potassium permanganate and manganese greensand are sometimes used to?
95.
What is the most effective method for the removal of disinfection by products?
96.
Settled backwash water that is recovered and re-used from a conventional surface water filtration plant should be returned to the beginning of the treatment train.
97.
What is the best process for sequestering manganese?
98.
What is a common mistake operators make in regards to flocculation is excessive flocculation time.
99.
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.
100.
Community water systems must check the natural radioactivity in their water supply at least?
