Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
When sludge is produced by water drawn from sources with relatively low turbidity it can be?
2.
When a raw water analysis shows the presence of anabaena, ceratium and oscillatoria, what problem may arise?
3.
The backwash rate must be high enough to?
4.
What range of temperatures will fusible plugs on chlorine cylinders melt?
5.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
6.
In a thermally stratified reservoir, water located beneath the thermocline may?
7.
What would be best to use for corrosion inhibition if the water is very low in alkalinity and calcium concentration?
8.
A method to increase or maintain the DO concentration of a thermally stratified reservoir?
9.
The actions levels for lead and copper are?
10.
Which is a chemical used in water treatment as a coagulating chemical?
11.
What test is used to estimate the optimum dosage of chemical compounds used for some process in water treatment?
12.
What is the most effective method for the removal of disinfection by products?
13.
What color will the water sample change when using amperometric titrator to check the chlorine residual?
14.
The minimum detention time in a conventional detention basin is?
15.
Once they become fouled, how are reverse osmosis membranes cleaned?
16.
The process by which water becomes a gas and rises is called?
17.
What conditions in a gravity filter will be produced when there is a larger particle size and less dense anthracite media?
18.
One of the steps taken to determine the threshold odor number is?
19.
What is the process that is used to dewater sludge?
20.
Which is the strongest disinfectant?
21.
The release of dissolved gasses in saturated cold water when pressure decreases in filter beds causes?
22.
What would have the least impact on the efficiency of copper sulfate?
23.
Community and non-transient community water systems must test for what if they use ozone for disinfection of oxidation?
24.
What is potassium permanganate most effective in?
25.
What causes water to turn red?
