Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
It is important not to rinse out the sample bottes used for collecting samples for bacteriological examination because?
2.
What chemical is slacked lime?
3.
The backwash rate must be high enough to?
4.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
5.
According to the Surface Water Treatment Rule, multiple barrier treatment is defined as?
7.
What is the most effective disinfection residual?
8.
Determining the pH is an important water quality test because the results indicate?
9.
Impurities found in water that do not come from plants or animals are
10.
What gasket is the best to use when connecting a chlorine cylinder or container to the chlorine feed system?
11.
What will ion exchange remove?
12.
What is the only MCL that varies with the temperature?
13.
Detention time in flocculation basins are usually designed to provide for?
14.
What is the best probable solution if rotifers are visible in finished water?
15.
What is the most troublesome operating problem for a sedimentation basin?
16.
All chlorine gas rooms...
17.
What emergency kit is for chlorine tank cars?
18.
What unit process will diatoms most likely replace?
19.
If ammonia vapor is passed over a chlorine leak in a cylinder valve, the leak is indicate by
20.
The proper emergency kit for a chlorine tanker is?
21.
Protozoa are larger than bacteria which are larger than viruses.
22.
What conditions will +Eh values of water support?
23.
The maximum safe level of electrical current that will not have any long lasting health effects is?
24.
One ton chlorine containers are equipped with two valves, one for liquid and one for gas.
25.
Why are check valves installed in suction lines?
26.
Regulations require that wastes from water treatment be monitored?
27.
The IDLH (immediately dangerous to life and health) value for chlorine is?
28.
Chlorine is chosen over chloramines because chlorine?
29.
Free chlorine residual values are based on contact time of at least?
30.
The continuous circulation of water from the earth into the atmosphere and back again is called?
31.
What type of water violation requires an all clear notification be given to the public?
32.
Anaerobic conditions in reservoirs can cause what problem?
33.
What conventional treatment step is eliminated by direct filtration?
34.
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?
36.
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?
37.
In which state are Giardia most vulnerable to inactivation through disinfection?
38.
What tests are performed most frequently in drinking water systems?
39.
Why is turbidity in drinking water undesirable?
40.
In a conventional treatment plant, primary coagulant compounds added to water during the falsh-mix step are?
41.
Monthly sampling results must be reported by the water purveyor?
42.
What is the most probable solution if nematodes are interfering with the disinfectant?
43.
According to the AWWA, the time period a filter should be used and then replaced is?
44.
A water molecule is made up of ?
45.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
46.
How many colonies per mI must the HPC test results show to be considered a reliable sample for coliform bacteria?
47.
Which is the strongest disinfectant?
48.
A pump should always be insatlled?
49.
What are the precursors to THMs?
50.
Acid rain is caused by
