Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Floc is produced when there is a chemical reaction between the coagulant and alkalinity. If the alkalinity of raw water is too low the floc formation will be poor. Some form of alkalinity must be added if the amount that is naturally found in the water source is less than?
2.
What chemical oxidant would be best for controlling the forming of THMs?
3.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
4.
If there is a notification of a HazMat spill of an unknown chemical into a stream that provides water to a water treatment plant, what would be the best action taken?
5.
After a backwash, to avoid turbidity spikes at the start of a service run, filters should be equipped with?
6.
What chemical can be added to the water system to sequester Iron and Manganese?
7.
What term describes the gathering of colloids into larger particles?
8.
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?
9.
What is the MCL for THM's?
10.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
11.
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?
12.
If iron bacteria is causing corrosion problems in the filters, what is the best solution?
13.
What is measured to determine total alkalinity?
14.
Which oxidant has the protentional of producing Chlorate (Cl03) by-products?
15.
What will increase alkalinity, pH, and hardness?
16.
If ammonia vapor is passed over a chlorine leak in a cylinder valve, the leak is indicate by
17.
One criteria to avoid filtration is that the fecal coliform concentration must be equal to or less than how many mg/L in representative samples of the source water immediately before the first or only point of disinfectant application in at least what percentage of the measurements made for the previous 6 months that the system served water to the public on an ongoing basis.
18.
For maximum charge neutralization the average zeta potential should be in what range?
19.
Impurities found in water that do not come from plants or animals are
20.
By what factor does the hydrogen ion concentration change when the pH changes from 8.0 to 9.0?
21.
What does it mean if there are sand boils on the surfaces of rapid sand filters during backwash?
22.
What could happen if the sludge in a sedimentation basin becomes too thick?
23.
Daily flow rates are limited in a conventional treatment plant due to the detention time needed to settle the floc and its sedimentation basin. What is the time range for the clarifier?
24.
An artesian spring occurs when
25.
Pulsator clarifiers are used to?
26.
What is the cause of temporary hardness?
27.
The monitoring program that checks for Benzene (Leaking Underground Storage Tank) is checking for what kind of chemical contaminant?
28.
When filter run times between backwashes are long, like one week, because low turbidity water is being applied to the filters, what problem could still arise?
29.
What is the sticky mat and fine sand of suspended matter that forms on the surface of a sand filter?
30.
What is the minimum angle that self cleaning tube settlers must be placed?
31.
The fluoride injection point should be located after water has received complete treatment.
32.
Which natural electrical force keeps colloidal particles apart in water treatment?
33.
What could be the reason for reduced pump flow, deteriorating pump impellers, plugging Needle Valves, and clogging PRV and Surge Control Valves?
34.
What should the flexible copper tubing be rated at the connects a 150lb chlorine cylinder to a manifold?
35.
To regenerate virgin greensand it must be soaked in the filter bed for several hours in a solution of chlorine containing?
36.
Detention time in flocculation basins are usually designed to provide for?
37.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
38.
Which is classified as a secondary contaminant?
39.
What works best to disinfect cryptosporidium?
40.
The outlet of a forced ventilation system for a chlorinator room she be located?
41.
Every year there are approximately what percentage of confined space deaths of would be rescuers?
42.
A composite sample should never be collected for what type of analysis?
43.
What does the saturation point of calcium carbonate primarily depend on?
44.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
45.
What is used for detection of chlorine gas leaks?
46.
What is the only MCL that varies with the temperature?
47.
All chlorine gas rooms...
48.
What should an authorized entrant do before he/she enters a permitted confined space?
49.
Wet activated carbon will remove what from the air? (In regards to safety)
50.
What membrane process is used to treat brackish water or seawater?
