Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Backwashing rate procedures should be reassessed to determine the cause of granular activated carbon loss if?
2.
The proper emergency kit for a chlorine tanker is?
3.
What device collects the settled water as it leaves the sedimentation basin?
4.
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?
5.
The hour during the day when the largest volume of water is being pumped is known as peak hourly flow?
6.
What is the next test when the membrane filter test shows four green colored colonies after incubating for 24hrs?
7.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
8.
In a thermally stratified reservoir, water located beneath the thermocline may?
9.
The actions levels for lead and copper are?
10.
In the MNO-MUG test the presence of E.coli is indicted by?
11.
What is the best process for sequestering manganese?
12.
What is the most efficient process for the removal of nitrate and nitrate?
13.
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?
14.
What term describes the gathering of colloids into larger particles?
15.
During filtration, what role does the action of straining of suspended particles play?
16.
If a body of water has high salinity and is warm, it will generally be high in dissolved oxygen.
17.
What will neutralize chlorine?
18.
Records of chemical analyses should be kept for?
19.
What is the pH of a saturated solution of sodium fluoride?
20.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
21.
What type of polar bonds are between the hydrogen atoms and the oxygen atom in water?
22.
In what form is Iron soluble in water?
23.
Bar screens are used to?
24.
What causes an increase in taste and odors when natural waters lack DO?
25.
What TON will consumers start to notice?
26.
Evaporated water in the earth's atmosphere will condense to form
27.
What type of self-contained breathing apparatus should be used at water plants?
28.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
29.
What could happen if the sludge in a sedimentation basin becomes too thick?
30.
What determines whether or not colloidal sized particles in suspension repel each other, stay in suspension, or agglomerate and eventually settle?
31.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
32.
What is the MCLG for chloride?
33.
Opening the discharge valve one full turn on a chlorine cylinder will?
34.
What is used to prevent water from entering a gas chlorinator?
35.
Adding CO2 to water will?
36.
How often should the fluoride feed system be checked?
38.
A method of destabilization is reducing the zeta potential to allow floc formation. What would be an acceptable ZP range?
39.
What can immediately occur if newly installed manganese greensand was not skimmed of the fines after backwashing and stratification steps were completed?
40.
Radon is a radioactive decay daughter of radium 226.
41.
The Colilert test (ONPG-MUG) shows the presence of total coliforms is shown by?
42.
Never apply water to a gaseous chlorine leak because the water will cause more issues.
43.
Ozone contractors must have a system to collect ozone off-gas because?
44.
Water treatment chemicals are added based on?
45.
Typically, how long is the flash mixing time in the coagulation process?
46.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
47.
What type of pump is most commonly used to feed chemicals into a water supply?
48.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
49.
The advantage of using oxidant ozone is that it?
50.
What does the pulsating energy in a pulsator clarifier help to do?
