Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Community water systems must check the natural radioactivity in their water supply at least?
2.
What is the most effective method for the removal of disinfection by products?
3.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
4.
A test(s) used to monitor the disinfection processes would be?
5.
A surface water treatment plant should have at least how many filtration beds?
6.
Trihalomethanes (THM's) are primarily a concern in?
7.
What percentage of solids sludge is produced in the precipitative softening plant?
8.
The pH scale ranges from?
9.
What is the minimum angle that self cleaning tube settlers must be placed?
10.
Which of the following composes the majority of scale in pipes?
11.
The more hydrogen ions
12.
What gas can cause lung and skin irritation?
13.
What is put in place in a reservoir to create an even flow rate through the entire volume of a clearwell to provide a consistent amount of detention time and minimize short-circuiting?
14.
What is the depression around the well of the water surface caused by pumping water from a well?
15.
For maximum charge neutralization the average zeta potential should be in what range?
16.
The loss of chloramine residuals in a water line or a storage tank is due to?
17.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
18.
Protozoa are larger than bacteria which are larger than viruses.
19.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
20.
The process by which water becomes a gas and rises is called?
21.
If dry alum and quicklime are mixed together, what will happen?
22.
What agency should be called for actual hands on assistance if a substantial chlorine leak incident occurs?
23.
In gram staining, part of the coliform verification is?
24.
The temperature range at which coliform bacteria samples must be stored before being delivered to a lab is?
25.
What is calcium sulfate also known as?
26.
Which of these has the most impact on tastes and odors in water?
27.
In alum sludge, what is typically the percentage of solid material?
28.
Chlorine gas ton cylinders include two feed line connections. One is an upper and one is a lower that is designed to?
29.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
30.
With coagulation reactions when alum is used, the specific insoluble floc formed is a precipitate of?
31.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
32.
Which is the method for testing for total coliform bacteria?
33.
When pumping from Well #1 the static level of Well #2 drops. What causes this?
34.
Giardia Lamblia is transmitted?
35.
Detention time in flocculation basins are usually designed to provide for?
36.
What is the best process for sequestering manganese?
37.
Under the Surface Water Treatment Rule a multiple barrier treatment consists of
38.
What chemical oxidant would be most effective for controlling biological growth?
39.
When it is dissolved in water for disinfection purposes, how long does ozone last?
40.
Protozoa that must be removed from raw water are?
41.
What will accurately measure 500mL solution?
42.
What conditions will +Eh values of water support?
43.
What unit process will diatoms most likely replace?
44.
In which state are Giardia most vulnerable to inactivation through disinfection?
45.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
46.
When doing coliform analysis use the presence-absence method, a sample should be incubated for?
47.
Every year there are approximately what percentage of confined space deaths of would be rescuers?
48.
Reaching breakpoint chlorination means?
49.
What chemical can be added to the water system to sequester Iron and Manganese?
50.
The structure Diatomaceous Earth filters media is applied to is called?
