Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
What is the MCL for THM's?
2.
What is a physical separation between a water supply outlet and the flood-level rim of a receiving vessel that must be at least twice the diameter of the water supply outlet and the flood-level rim of the receiving vessel. This separation must be at leasttwice the diameter of the water supply outlet and never less than one inch?
3.
If a rapid gravity filter is well operated, the finished water will have?
4.
What is the usual detention time required to produce optimal floc aggregation?
5.
How often should the solids concentration be determined in solid contact basins with fairly constant water quality parameters?
6.
What method can be used to control scaling, but is never used to control corrosion?
7.
What changes does an operator need to make when there are issues with floc formation?
8.
The proper emergency kit for a 150lb chlorine cylinder is?
9.
What range of temperatures will fusible plugs on chlorine cylinders melt?
10.
What are the chemical symbols for hypochlorous acid and hypochlorite ions?
11.
An organic particle that is stabilized by attracting a layer of water molecules to its surface is known as a?
12.
What chemicals are used to substitute chlorine as pre-oxidants to minimize the formation of disinfection byproducts in a water plant?
13.
The continuous circulation of water from the earth into the atmosphere and back again is called?
14.
What is the most probable solution if nematodes are interfering with the disinfectant?
15.
Improper backwashing of the filter media can lead to?
16.
If a water system collects less than 40 samples a month, how many can be coliform positive and the water system still maintain compliance?
17.
A common mistake operators make in regards to flocculation unit is excessive flocculation time.
18.
What is the best disinfectant against Cryptosporidium?
19.
A sedimentation basin with mechanical sludge removal equipment should be drained and inspected?
20.
The maximum amount of time that between draining, cleaning, and inspection of sedimentation basins with mechanical sludge removal components is?
21.
If sodium hypochlorite comes into contact with the skin or eyes, the area should be flushed with water for at least 15 minutes.
22.
Which is the normal sequence of solids removal processing following flash mixing in a conventional water treatment plant?
23.
The porous material just above the water table that holds small quantities of water by capillary action is called?
24.
The proper emergency kit for a chlorine tanker is?
25.
What is the most effective disinfection residual?
