Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
What units ae the MCLs for radium-226, radium 228 and gross alpha particles radioactivity measured in?
2.
Who can declare the vulnerability of a water source?
3.
The IDLH (immediately dangerous to life and health) value for chlorine is?
4.
The porous material just above the water table that holds small quantities of water by capillary action is called?
5.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
6.
Turbidity particles will settle more quickly and uniformly in a sedimentation basin when there is?
7.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
8.
Why has magnetic ion exchange resin been developed?
9.
Water hardness is measured in equivalent amounts of?
10.
Chlorine is chosen over chloramines because chlorine?
11.
What national law regulates underground disposal of wastes in deep wells?
12.
What does pinpoint floc, fish eyes, and high turbidity in settled water indicate?
13.
In pounds, how much ammonia is contained in a 1 ton cylinder that is full?
14.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
15.
What water rights are acquired from diverting a water source and then putting it to beneficial use?
16.
Turbidity in the drinking water system can not exceed?
17.
What range of temperatures will fusible plugs on chlorine cylinders melt?
18.
If there is gravel displacement in a filter bed from backwash rates with too high of a velocity, could eventually cause?
19.
The pH scale ranges from?
20.
What adjustments will the operator of a surface water treatment plant have to make if the raw water is very high in turbidity levels?
21.
What chemical oxidant would be most effective for controlling biological growth?
22.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
23.
Coagulation occurs during the first
24.
What are the precursors to THMs?
25.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
26.
Anionic polymers are used as filter aids to agglomerate small floc particles left in the sedimentation basin effluent and make them tougher to avoid?
27.
What is the best addition for water that is highly colored due to organic matter?
28.
What is the most troublesome operating problem for a sedimentation basin?
29.
When should polyphosphates used for sequestration of iron and manganese from a well be injected?
30.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
31.
Bar screens are used to?
32.
What is the best process for sequestering manganese?
33.
Which is classified as a secondary contaminant?
34.
If there is debris found in the filter bed after backwashing a filter this can indicate?
35.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
36.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
37.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
38.
Anaerobic conditions in reservoirs can cause what problem?
39.
The minimum detention time in a conventional detention basin is?
40.
What will occur if the activation process of silica is not carefully controlled?
41.
The organism that causes Giardiasis
42.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
43.
River water is not uniform in quality from hour to hour or day to day.
44.
What is a hypochlorinator used for?
45.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
46.
Waterborne diseases like typhoid and cholera are caused by?
47.
How often should the fluoride concentration be measured in treated water?
48.
Improper backwashing of the filter media can lead to?
49.
In alum sludge, what is typically the percentage of solid material?
50.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
