Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
2.
What does total alkalinity refer to?
3.
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.
4.
What effect will caustic soda (NaOH)have on water?
5.
What does a low pH favor the formation of?
6.
Impurities found in water that do not come from plants or animals are
7.
If the chlorine demand suddenly increases from 0.4 mg/L to 2.8 mg/L, what could be the reason?
8.
What is used to prevent water from entering a gas chlorinator?
9.
What chemicals are used to substitute chlorine as pre-oxidants to minimize the formation of disinfection byproducts in a water plant?
10.
What does the operator use to adjust the amount of liquid or gas delivered to water?
11.
Why do operators monitor a filter's operation time, headloss and effluent turbidity level?
12.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
13.
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.
14.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
15.
Post sedimentation process, the turbidity of settled water before it is applied to the filters should be kept below?
16.
In pounds, how much ammonia is contained in a 1 ton cylinder that is full?
17.
What oxidant has a potential of producing ClO3 by products?
18.
At what temperature does the maximum density of water occur?
19.
What is the main function of a flocculation basin?
20.
Where is sludge pumped when it is removed from a clarifier or after a filter backwash?
21.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
22.
What tests are performed most frequently in drinking water systems?
23.
What occurs in raw water as the level of ammonia decreases?
24.
What will ion exchange remove?
25.
Opening the discharge valve one full turn on a chlorine cylinder will?
26.
In what form is Iron soluble in water?
27.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
28.
An increase in filter media head loss could be an indicator of?
29.
Monthly sampling results must be reported by the water purveyor?
30.
The sampling points located for required sampling of natural radionuclides are located?
31.
Shellfish grown in polluted waters have been known to contain the organism that causes infectious hepatitis.
32.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
33.
One of the steps taken to determine the threshold odor number is?
34.
One of the ways an optimum coagulant dosage can be established is?
35.
Gravity filters should not use more than what percent of daily production for backwash?
36.
What chemical oxidant would be most effective for controlling biological growth?
37.
What should the turbidity of settled water be before it is applied to the filters, post sedimentation process?
38.
The backwash rate must be high enough to?
39.
Detention time in flocculation basins are usually designed to provide for?
40.
Anionic polymers are used as filter aids to agglomerate small floc particles left in the sedimentation basin effluent and make them tougher to avoid?
41.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
42.
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?
43.
Pulsator clarifiers are used to?
44.
What would have the least impact on the efficiency of copper sulfate?
45.
The maximum safe level of electrical current that will not have any long lasting health effects is?
46.
What unit process will diatoms most likely replace?
47.
During filtration, what role does the action of straining of suspended particles play?
48.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
49.
Never install a new gasket when a chlorine cylinder or container is changed.
50.
What happens when there is high algae growth in a reservoir?
