Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
What conventional treatment step is eliminated by direct filtration?
2.
Sludge should be removed from a gravity sedimentation basin when reaching a level of?
3.
What is the most favorable raw water condition for good flocculation?
4.
What is a hypochlorinator used for?
5.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
6.
What is the most effective method for removing tastes and odors?
7.
What oxidant should be fed as early as possible in the treatment process to allow for complete reaction before it enters the distribution system?
8.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
9.
Why is it important to reduce turbidity?
10.
Viruses are sometimes resistant to disinfection.
11.
Why has magnetic ion exchange resin been developed?
12.
A coliform sample is considered invalid and a new sample must be taken within 24hrs if the HPC count is above?
13.
Pathogenic organisms?
14.
Even a low concentration of ammonia gas can be fatal to humans if it is at least?
15.
What type of algae would most likely be found in nutrient rich water?
16.
What part of the human body is the most vulnerable to allowing microorganisms to enter it?
17.
Under the process of safety management, sites are required to do a site assessment if the facility in a single process has more than how many pounds of chlorine?
18.
Compared to disinfecting water with free chlorine, what is a disadvantage in switching to ozone?
19.
What laboratory device sterilizes laboratory apparatuses and microbial media by using pressurized steam?
20.
The porous material just above the water table that holds small quantities of water by capillary action is called?
21.
Chlorine is chosen over chloramines because chlorine?
22.
Anaerobic conditions in reservoirs can cause what problem?
23.
What percentage of the earth's surface is covered in water?
24.
As the level of phosphates increase in a new water supply, an operator should?
25.
What type of chlorine gas feeder is most commonly used?
