Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
A common chemical added to boost alkalinity is?
2.
How is chlorine dioxide formed?
3.
What type of pump is most commonly used to feed chemicals into a water supply?
4.
Permanganate reactions are highly dependent on?
5.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
6.
A composite sample should never be collected for what type of analysis?
7.
What is measured to determine total alkalinity?
8.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
9.
Anaerobic conditions in reservoirs can cause what problem?
10.
For alum coagulation of color, what is the correct pH?
11.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
12.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
13.
Coliform bacteria are classified as?
14.
What should an authorized entrant do before he/she enters a permitted confined space?
15.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
16.
What is the most favorable raw water condition for good flocculation?
17.
Records of chemical analyses should be kept for?
18.
A pump should always be insatlled?
19.
Gravity filters should not use more than what percent of daily production for backwash?
20.
When a permit is required to enter a confined space, who may sign the permit?
21.
What type of polymers are sometimes formulated with regulated substances?
22.
What is the term that defines the calculation of a water plants physical property due wear and tear?
23.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
24.
Adding CO2 to water will?
25.
Under the process of safety management, sites are required to do a site assessment if the facility in a single process has more than how many pounds of chlorine?
26.
Where are samples taken for lead and copper?
27.
When responding to a chlorine gas leak, the responder should have a SCBA and a?
28.
The upper surface of the zone of saturation of ground water in an unconfined aquifer is called the?
29.
Evaporated water in the earth's atmosphere will condense to form
30.
What is a major cause of short circuiting in a sedimentation basin?
31.
What one of these would be the best chemical oxidant to use for controlling THMs formation potential?
32.
What forms when you add Alum to turbid water?
33.
Protozoa are larger than bacteria which are larger than viruses.
34.
Granular activated carbon is used as?
35.
If there is gravel displacement in a filter bed from backwash rates with too high of a velocity, could eventually cause?
36.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
37.
What is the MCL for HAA5s?
38.
What type of sedimentation basins have the flow of water admitted at an angle?
39.
Most totalizer meters at treatment plants are commonly
40.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
41.
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.
42.
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?
43.
A surface water treatment plant should have at least how many filtration beds?
44.
What type of self-contained breathing apparatus should be used at water plants?
45.
What tests are performed most frequently in drinking water systems?
46.
A method to increase or maintain the DO concentration of a thermally stratified reservoir?
47.
Pathogenic organisms?
48.
What is the most effective disinfection residual?
49.
What is a hypochlorinator used for?
50.
As the level of phosphates increase in a new water supply, an operator should?
51.
Most regulated contaminants in drinking water?
52.
Which is not considered to be a waterborne disease?
53.
What works best to disinfect cryptosporidium?
54.
The action level for copper is 0.015 mg/L.
55.
What chemical oxidant would be most effective for controlling biological growth?
56.
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?
57.
What organism can escape coagulation and then pass through a granular filter?
58.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
59.
Salts, Bases, and Acids lacking carbon are organic compounds.
60.
As CaCO3 how much alkalinity will dry-basis alum consume?
61.
The scattering of light by the particles in finished water is from the turbidity caused by
62.
In a permit entry confined space, who is responsible for terminating entries?
63.
A grout seal should be?
64.
The actions levels for lead and copper are?
65.
What is the main function of a flocculation basin?
66.
Free chlorine residual values are based on contact time of at least?
67.
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.
68.
What is the total concentration of dissolved solids in the wastewater from the regeneration of ion exchange units?
69.
What would have the least impact on the efficiency of copper sulfate?
70.
During filtration, what role does the action of straining of suspended particles play?
71.
The temperature range at which coliform bacteria samples must be stored before being delivered to a lab is?
72.
Giardia Lamblia is transmitted?
73.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
74.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
75.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
76.
In alum sludge, what is typically the percentage of solid material?
77.
Fine solids that remain suspended in water and will not settle on their own are known as?
78.
Records of sanitary surveys must be kept for?
79.
What is the main problem if particle agglomeration is occurring in a filter for iron and manganese removal at the interface of the coal layer below?
80.
Why is turbidity in drinking water undesirable?
81.
What percentage of solids sludge is produced in the precipitative softening plant?
82.
What is the best addition for water that is highly colored due to organic matter?
83.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
84.
What is used as part of a sedimentation basin to allow a controlled flow of the supernatant to be collected and directed to the filter beds?
85.
What TON will consumers start to notice?
86.
Powered activated carbon is usually used to control what?
87.
What disinfectant is commonly used and free of Cl2 to avoid THMs?
88.
Who can declare the vulnerability of a water source?
89.
Trihalomethanes (THM's) are primarily a concern in?
90.
What form is the protozoan Giardia Lamblia transmitted in?
91.
Turbidity in the drinking water system can not exceed?
92.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
93.
Water treatment chemicals are added based on?
94.
Which of the following are true. At the end of the coagulation, flocculation, and sedimentation process?
95.
The process of the build up of corrosion products is known as?
96.
Water impurities that come from plants or animals are
97.
If ammonia vapor is passed over a chlorine leak in a cylinder valve, the leak is indicate by
98.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
99.
What device found in labs sterilizes by using pressurized steam?
100.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
