Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
What device collects the settled water as it leaves the sedimentation basin?
2.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
3.
What term describes the gathering of colloids into larger particles?
4.
The sampling points located for required sampling of natural radionuclides are located?
5.
How is chlorine dioxide formed?
6.
What does the saturation point of calcium carbonate primarily depend on?
7.
What is used for detection of chlorine gas leaks?
8.
Pure water can be found?
9.
How often should the fluoride feed system be checked?
10.
Why do operators monitor a filter's operation time, headloss and effluent turbidity level?
11.
What parameter must be much better than conventional treatment basins in basins using tube and plate settlers?
12.
Which is the best removal method if a well contains soluble iron?
13.
What is measured to determine total alkalinity?
14.
What works best to disinfect cryptosporidium?
15.
Protozoa that must be removed from raw water are?
16.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
17.
What type of chlorine gas feeder is most commonly used?
18.
What device found in labs sterilizes by using pressurized steam?
19.
Viruses are sometimes resistant to disinfection.
20.
What makes chlorine use more advantageous over chloramines?
21.
What is the most effective disinfection residual?
22.
Impurities found in water that do not come from plants or animals are
23.
What are the hair like appendages that Giardia trophozoites use to propel themselves through water are?
24.
Most regulated contaminants in drinking water?
25.
The fluoride injection point should be located after water has received complete treatment.
26.
Which would be an indication that there is an issue with a part of the coagulation-flash mix-flocculation process operation?
27.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
28.
What is the usual range of percent sludge solids, if the sludge is allowed to accumulate and compact at the bottom of a sedimentation basin?
29.
Which process helps remove contaminants in water by causing them to cling to the surface of certain filter grains?
30.
A change in the water elevation from the normal level to the pumping level is?
31.
When soda ash is added to water for softening purposes what will it do?
32.
The factors that effect coagulation and flocculation with alum are
34.
Assuming all other variables remain the same, a decrease in the pH when using free chlorine would?
35.
What should an authorized entrant do before he/she enters a permitted confined space?
36.
Records of chemical analyses should be kept for?
37.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
38.
Why is turbidity in drinking water undesirable?
39.
What would have the least impact on the efficiency of copper sulfate?
40.
What conditions will +Eh values of water support?
41.
How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
42.
Every 1.0 mg/L of alum consumes what amount of alkalinity during the formation of floc particles?
43.
The marble test is used to determine if water is saturated with calcium carbonate and has what other general use?
44.
What national law regulates underground disposal of wastes in deep wells?
45.
What is potassium permanganate most effective in?
46.
What would be the short term goal when a water source is destroyed or damaged by some type of disaster that causes total contamination?
47.
At what temperature does the maximum density of water occur?
48.
What type of pump is most commonly used to feed chemicals into a water supply?
49.
What form is Giardia most infectious?
50.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
