Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
What device found in labs sterilizes by using pressurized steam?
2.
What is the most probable solution if crustaceans have clogged the water treatment plant's filters?
3.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
4.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
5.
During daylight hours, algae growth in a reservoir will do what?
6.
The porous material just above the water table that holds small quantities of water by capillary action is called?
7.
Impurities found in water that do not come from plants or animals are
8.
What will accurately measure 500mL solution?
9.
When it is dissolved in water for disinfection purposes, how long does ozone last?
10.
The process by which water becomes a gas and rises is called?
11.
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.
12.
In alum sludge, what is typically the percentage of solid material?
13.
What sludge dewatering process is best for alum sludges when the cakes are very dry, filtrate is clear, and solids capture is very high?
14.
What is the simplest chlorine gas feeder for controlling chlorine gas flow?
15.
What does the operator use to adjust the amount of liquid or gas delivered to water?
16.
What test is used to determine the presence of coliform bacteria?
17.
What does total alkalinity refer to?
18.
When the cell division in bacteria has been disrupted, it has been?
19.
If the water temperature decreases this will cause the disinfection action of chlorine to?
20.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
21.
What type of filtration is permitted under the Surface Water Treatment Rule?
22.
What is the main purpose for adding coagulant chemicals to raw water?
23.
The loss of chloramine residuals in a water line or a storage tank is due to?
24.
The proper emergency kit for a chlorine tanker is?
25.
If dry alum and quicklime are mixed together, what will happen?
26.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
27.
What is a hypochlorinator used for?
28.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
29.
Current regulations require that water treatment wastes be monitored?
30.
Most regulated contaminants in drinking water?
31.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
32.
What should an operator do to compensate for temperature changes in a conventional water treatment plant with dual media filters that has very cold water in the winter and warm water in the summer?
33.
Which oxidant has the protentional of producing Chlorate (Cl03) by-products?
34.
What is calcium sulfate also known as?
35.
As CaCO3 how much alkalinity will dry-basis alum consume?
36.
Microorganisms that require dissolved or free oxygen are?
37.
To unclog the head of a chemical feed pump an operator should first?
38.
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?
39.
What is the MCL for THM's?
40.
What effect will an increase in total dissolved solids in water to be treated be?
41.
Chlorine is chosen over chloramines because chlorine?
42.
Potassium permanganate and manganese greensand are sometimes used to?
43.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
44.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
45.
What is potassium permanganate most effective in?
46.
If a rapid gravity filter is well operated, the finished water will have?
47.
The process of the build up of corrosion products is known as?
48.
Detention time in flocculation basins are usually designed to provide for?
49.
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.
50.
Water hardness is measured in equivalent amounts of?
51.
In gram staining, part of the coliform verification is?
52.
Why has magnetic ion exchange resin been developed?
53.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
54.
What is the MCLG for chloride?
55.
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?
56.
The factors that effect coagulation and flocculation with alum are
57.
A surface water treatment plant should have at least how many filtration beds?
58.
A grout seal should be?
59.
In a permit entry confined space, who is responsible for terminating entries?
60.
How is chlorine dioxide formed?
61.
What is used to prevent water from entering a gas chlorinator?
62.
What causes an increase in taste and odors when natural waters lack DO?
63.
What is the quantity of dissolved oxygen in water a function of?
64.
What is the MCL for HAA5s?
65.
What type of sedimentation basins have the flow of water admitted at an angle?
66.
What oxidant has a potential of producing ClO3 by products?
67.
At its endpoint, what color does the oxidant potassium permanganate turn?
68.
What do long filter runs tend to cause?
69.
What is the best process for removing turbidity?
70.
What advantage over Aluminum Sulfate does Ferric Sulfate have?
71.
What is the main function of a flocculation basin?
72.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
73.
What happens when there is high algae growth in a reservoir?
74.
What causes water to turn red?
75.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
76.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
77.
A composite sample should never be collected for what type of analysis?
78.
The organism that causes Giardiasis
79.
The sampling points located for required sampling of natural radionuclides are located?
80.
Bar screens are used to?
81.
The backwash rate must be high enough to?
82.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
83.
What range of temperatures will fusible plugs on chlorine cylinders melt?
84.
Organic chemistry is concerned with compounds containing what element?
85.
The scattering of light by the particles in finished water is from the turbidity caused by
86.
Which is classified as a secondary contaminant?
87.
Where are the two points on a gravity filter used to measure head loss located?
88.
What are the precursors to THMs?
89.
What is the best type of salt to use in the regeneration of ion exchange softener resin?
91.
How much carbon is approximately lost during the reactivation process for granular activated carbon?
92.
The proper emergency kit for a 150lb chlorine cylinder is?
93.
HPC and Coliform tests are the same because they both?
94.
The continuous circulation of water from the earth into the atmosphere and back again is called?
95.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
96.
Low temperature water can be compensated for when using Alum by?
97.
What effect will caustic soda (NaOH)have on water?
98.
The injection of fluoride should be as far away as possible from any chemical containing?
99.
A common chemical added to boost alkalinity is?
100.
Filtration rates vary from what of filter surface area?
