Welcome to the Water Treatment Operator Practice Test.
Choose the best possible answer to the question.
1.
What would be the most probable solution to control algae in the source water if the algae is clogging the filters in the water plant?
2.
When 0.3 mg/L chlorine is added to water, the residual will increase by 0.3 mg/L.
3.
A constituent dissolved in source water that will precipitate when oxidized is?
4.
What chemical could cause pink water problems?
5.
Operators working at a treatment plant should only use self contained breathing apparatus equipment that has been approved by what agency?
6.
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?
7.
If ammonia vapor is passed over a chlorine leak from a cylinder valve, the leak is indicate by
8.
The minimum detention time in a conventional detention basin is?
9.
What is the removal level of cryptosporidium oocysts with conventional sedimentation?
10.
Protozoa that must be removed from raw water are?
11.
All chlorine gas rooms...
12.
What causes water to turn red?
13.
What is an inorganic particle that is stabilized in water by attracting a layer of oppositely charged ions surrounded by a diffuse layer of counterions?
14.
The structure Diatomaceous Earth filters media is applied to is called?
15.
Microorganisms that require dissolved or free oxygen are?
16.
Test results from a multiple tube fermentation test for coliform bacteria are expressed as MPN (most probable number) per 100 milliliters, the number is determined from?
17.
What does the saturation point of calcium carbonate primarily depend on?
18.
A chlorine evaporator maintains a water bath at?
19.
What is the principle form of alkalinity found in raw water from both surface and ground sources?
20.
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees Celsius?
21.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
23.
As the level of phosphates increase in a new water supply, an operator should?
24.
Filtration rates vary from what of filter surface area?
25.
Trihalomethanes (THM's) are primarily a concern in?
