Welcome to the Water Treatment Operator 100 Question Practice Test.
Choose the best possible answer to the question.
1.
For lime-soda ash softening plants, what is the most economical sludge disposal method?
2.
Bar screens are used to?
3.
If dry alum and quicklime are mixed together, what will happen?
4.
What device found in labs sterilizes by using pressurized steam?
5.
In a permit entry confined space, who is responsible for terminating entries?
6.
Why do mud balls and hard spots develop in high rate gravity filters during the summer months?
7.
The water purveyor must post the Consumer Confidence Report on a publicly accessible web site if it serves more than how many people?
8.
The backwash rate must be high enough to?
9.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
10.
If adequate surface area and detention time is provided in the sedimentation basin, what would the expected solids removal efficiency level be?
11.
Powered activated carbon is usually used to control what?
12.
What is the quantity of dissolved oxygen in water a function of?
13.
Which is not considered to be a waterborne disease?
14.
Protozoa that must be removed from raw water are?
15.
What was created to have uniform standards in Water Treatment?
16.
The scattering of light by the particles in finished water is from the turbidity caused by
17.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
18.
What is the most important reason to reduce turbidity?
19.
What are the precursors to THMs?
20.
Never install a new gasket when a chlorine cylinder or container is changed.
21.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
22.
What will increase alkalinity, pH, and hardness?
23.
The most accurate chlorine residual measurement would be taken with?
24.
What causes an increase in taste and odors when natural waters lack DO?
25.
Direct filtration eliminates what conventional treatment step?
26.
The disinfection treatment process is?
27.
The hydrologic cycles create what two primary sources of water?
29.
Why do operators monitor a filter's operation time, headloss and effluent turbidity level?
30.
What national law regulates underground disposal of wastes in deep wells?
31.
The structure Diatomaceous Earth filters media is applied to is called?
32.
What is the minimum angle that self cleaning tube settlers must be placed?
33.
When using chloramines
34.
The Zeta Protentional measures the number of excess what found on the surface of all particular matter?
35.
What is the most important thing to consider in automatic startup after a power failure has occured?
36.
What is the term that defines the calculation of a water plants physical property due wear and tear?
37.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
38.
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?
39.
What is the most effective method for removing tastes and odors?
40.
What are different types of media used to filter water for human consumption?
41.
What type of charge do the compounds that form when iron or aluminum salts react with water have?
42.
What is the process that is used to dewater sludge?
43.
What type of filtration is permitted under the Surface Water Treatment Rule?
44.
Permanganate reactions are highly dependent on?
45.
Once they become fouled, how are reverse osmosis membranes cleaned?
46.
What is the typical strength of calcium hypochlorite?
47.
Regulations require that wastes from water treatment be monitored?
48.
A water sample that is acidified must have a final water pH of?
49.
The upper surface of the zone of saturation of ground water in an unconfined aquifer is called the?
50.
Which is classified as a secondary contaminant?
51.
What water quality indicator is of greatest concern in a surface water treatment plant?
52.
What is the depression around the well of the water surface caused by pumping water from a well?
53.
The proper emergency kit for a 150lb chlorine cylinder is?
54.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
55.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
56.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
57.
A common chemical added to boost alkalinity is?
58.
What chemical oxidant would be best for controlling the forming of THMs?
59.
According to the AWWA, at 0.1 NTUs filtration can remove what percent of giardia cyts?
60.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
61.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
62.
What does a low pH favor the formation of?
63.
Most regulated contaminants in drinking water?
64.
During daylight hours, algae growth in a reservoir will do what?
65.
What would have the least impact on the efficiency of copper sulfate?
66.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
67.
What does it mean when a filter is ripening?
68.
Turbidity in the drinking water system can not exceed?
69.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
70.
The sampling points located for required sampling of natural radionuclides are located?
71.
In alum sludge, what is typically the percentage of solid material?
72.
The loss of chloramine residuals in a water line or a storage tank is due to?
73.
What does a high pH favor the formation of?
74.
A pro of chloramines is?
76.
When abundant in water, what algae genera are most likely to cause taste and odor issues when abundant in water?
77.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
78.
How often should the fluoride concentration be measured in treated water?
79.
What is the most favorable raw water condition for good flocculation?
80.
What is the best addition for water that is highly colored due to organic matter?
81.
What is a major cause of short circuiting in a sedimentation basin?
82.
What is the MCL for THM's?
83.
What is the main purpose for adding coagulant chemicals to raw water?
84.
What conventional treatment step is eliminated by direct filtration?
85.
If the natural fluoride content of raw water is variable, the concentration of the raw water should be measured?
86.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
87.
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when there is?
88.
What does the saturation point of calcium carbonate primarily depend on?
89.
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?
90.
Past the breakpoint chlorination point, what percentage of the total chlorine residual should be free chlorine?
91.
Why is water softening a part of the water treatment process?
92.
Monthly sampling results must be reported by the water purveyor?
93.
During filtration, what role does the action of straining of suspended particles play?
94.
What type of self-contained breathing apparatus should be used at water plants?
95.
Organic chemistry is concerned with compounds containing what element?
96.
What is the rule that sets MCL's for harmful chemicals?
97.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
98.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
99.
As the level of phosphates increase in a new water supply, an operator should?
100.
To regenerate virgin greensand it must be soaked in the filter bed for several hours in a solution of chlorine containing?
