Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
Low temperature water can be compensated for when using Alum by?
2.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
3.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
4.
What is usually used to disinfect the gravel packing of a ground water well?
5.
What gas can cause lung and skin irritation?
6.
What device found in labs sterilizes by using pressurized steam?
7.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
8.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
9.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
10.
According to the AWWA, the time period a filter should be used and then replaced is?
11.
What is the sample size for lead and copper analysis?
12.
If the water temperature decreases this will cause the disinfection action of chlorine to?
13.
What type of self-contained breathing apparatus should be used at water plants?
14.
What is a universal solvent?
15.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
16.
Salts, Bases, and Acids lacking carbon are organic compounds.
17.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
18.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
19.
What is the process that is used to concentrate sludge?
20.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
21.
Which of the following composes the majority of scale in pipes?
22.
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.
23.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
24.
If dry alum and quicklime are mixed together, what will happen?
25.
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?
26.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
27.
A constituent dissolved in source water that will precipitate when oxidized is?
28.
The minimum detention time in a conventional detention basin is?
29.
Organic chemistry is concerned with compounds containing what element?
30.
What is the typical strength of calcium hypochlorite?
31.
Alachlor, Lindane, and Toxaphene are examples of?
32.
Coagulation is a chemical and physical reaction that converts?
33.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
34.
Giardia Lamblia is transmitted?
35.
What membrane process is used to treat brackish water or seawater?
36.
What process change be should be done if the level of turbidity in raw water decreased from 7 to 3 NTUs?
37.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
38.
Opening the discharge valve one full turn on a chlorine cylinder will?
39.
Plant growth in a reservoir will usually be found at a depth of?
40.
Regulations require that wastes from water treatment be monitored?
41.
The process of the build up of corrosion products is known as?
42.
The cl2 residual in water may be determined by using the reagent?
43.
The most probable cause of a problem with a chlorinator is?
44.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
45.
What device collects the settled water as it leaves the sedimentation basin?
46.
Every year there are approximately what percentage of confined space deaths of would be rescuers?
47.
What makes chlorine use more advantageous over chloramines?
48.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
49.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
50.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
51.
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?
52.
What is the maximum feed rate when adding fluoride to drinking water?
53.
The sampling points located for required sampling of natural radionuclides are located?
54.
Coagulation occurs during the first
55.
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when there is?
56.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
57.
What type of polymers are sometimes formulated with regulated substances?
58.
Trihalomethanes (THM's) are primarily a concern in?
59.
Backflow wash flows should expand filter media by?
60.
What is the minimum angle that self cleaning tube settlers must be placed?
61.
The porous material just above the water table that holds small quantities of water by capillary action is called?
62.
A property that is important to water treatment that is physical as opposed to chemical is?
63.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
64.
Chlorine is chosen over chloramines because chlorine?
65.
A system that fails to collect water samples in their distribution system would fall under which public notification system?
66.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
67.
What does the pulsating energy in a pulsator clarifier help to do?
68.
Microorganisms that require dissolved or free oxygen are?
69.
A total coliform positive sample must be tested for the presence of?
70.
Which of these has the most impact on tastes and odors in water?
71.
Gravity filters should not use more than what percent of daily production for backwash?
72.
Water impurities that come from plants or animals are
73.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
74.
How often should the fluoride concentration be measured in treated water?
75.
What could be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle Valves, and clogging PRV and Surge Control Valves?
76.
What is the MCLG for chloride?
77.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
78.
Never install a new gasket when a chlorine cylinder or container is changed.
79.
When it is dissolved in water for disinfection purposes, how long does ozone last?
80.
One criteria to avoid filtration is that the fecal coliform concentration must be equal to or less than how many mg/L in representative samples of the source water immediately before the first or only point of disinfectant application in at least what percentage of the measurements made for the previous 6 months that the system served water to the public on an ongoing basis.
81.
What is a major cause of short circuiting in a sedimentation basin?
82.
Fluoride concentration above what mg/L will likely cause teeth to become pitted?
83.
The treatment process that controls corrosion or scaling is known as?
84.
What will ion exchange remove?
85.
What adverse effects does the secondary contaminant manganese have?
86.
What would have the least impact on the efficiency of copper sulfate?
87.
The maximum sustained flow possible from a well mostly depends on?
88.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
89.
The action level for copper is 0.015 mg/L.
90.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
91.
Why has magnetic ion exchange resin been developed?
92.
What does the saturation point of calcium carbonate primarily depend on?
93.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
94.
What is the most effective method for removing tastes and odors?
95.
What is the most advantageous application point for powdered activated carbon?
96.
When entering a permitted confined space entry structure, always complete a permit and?
97.
A pump should always be insatlled?
98.
What is used for detection of chlorine gas leaks?
99.
A pro of chloramines is?
100.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
