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Aquatic Facility Operator (AFO) Certification Exam
COMPLETE VERIFIED QUESTIONS AND CORRECT
ANSWERS LATEST UPDATE.pdf
"Slurry feed" or "body feed" refers to: - Answer-Diatomite
added during a filter run
The term pH is determined by the concentration of: -
Answer-Hydrogen ions
Because carbonate ions combine with hydrogen ions,
sodium carbonate will cause pH to: - Answer-Rise
When enough chlorine is added to cause complete
oxidation of all organic compounds, a sudden drop in
residual chlorine may be noticed. The point at which this
occurs is called the: - Answer-Break-point
"Residual chlorine" refers to: - Answer-The amount left in
the water after oxidation of organic material
Which of the following is NOT considered a swimming pool
disinfectant: - Answer-Chlorinated hydrocarbons
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When chlorine is used as a disinfectant for swimming
pools, the form in which it's disinfectant properties are the
greatest is: - Answer-Hypochlorous acid
The chemical most commonly used to raise pH is: -
Answer-Sodium carbonate
An example of a chemical used to stabilize chlorine is: -
Answer-Cyanuric acid
The chemical reagent recommended by the health
department to test chlorine residual in swimming pools is: -
Answer-D.P.D.
The chemical reagent used most often to test pH in
swimming pools is: - Answer-Phenol red
Considering all factors, which of the following would be the
BEST range for pH in a swimming pool: - Answer-7.2-7.8
The percentage of hypoclorous acid formation is most
influenced by: - Answer-pH
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Pool painting is usually done: - Answer-Before opening in
the spring
When a pool is chlorinated with gas chlorine, the operator
must also use: - Answer-Soda Ash
The term "chlorine demand" refers to: - Answer-The
amount of chlorine which will react with substances in the
pool
Re-circulation pumps used in swimming pools are the type
called: - Answer-Centrifugal pumps
Reversing the flow of water through the filters is called: -
Answer-Backwash
The minimum turnover rate to obtain 100% clarity in a pool
is: - Answer-Once in eight hours
There is a noticeable odor of chlorine around your pool
and bathers are complaining of eye irritation. Which of the
, 4|Page
following is most likely to solve the problem: - Answer-
Break point chlorination
As pH increases, chlorine effectiveness: - Answer-
Decreases
In a high-rate sand filter system, the tanks are
backwashed: - Answer-All at once
The baffle in the filter tank is there to: - Answer-Disperse
water evenly over the surface of the filter media
An access manhole is constructed on each tank in sand
and anthracite filter systems: - Answer-All of the above
A hair and lint strainer should be located: - Answer-Before
the pump and before the filter
Sodium hypochlorite used as a pool sanitizer also affects
the water pH in the following manner: - Answer-Raises
Chlorine gas will ________ the pH: - Answer-Lower
Aquatic Facility Operator (AFO) Certification Exam
COMPLETE VERIFIED QUESTIONS AND CORRECT
ANSWERS LATEST UPDATE.pdf
"Slurry feed" or "body feed" refers to: - Answer-Diatomite
added during a filter run
The term pH is determined by the concentration of: -
Answer-Hydrogen ions
Because carbonate ions combine with hydrogen ions,
sodium carbonate will cause pH to: - Answer-Rise
When enough chlorine is added to cause complete
oxidation of all organic compounds, a sudden drop in
residual chlorine may be noticed. The point at which this
occurs is called the: - Answer-Break-point
"Residual chlorine" refers to: - Answer-The amount left in
the water after oxidation of organic material
Which of the following is NOT considered a swimming pool
disinfectant: - Answer-Chlorinated hydrocarbons
,2|Page
When chlorine is used as a disinfectant for swimming
pools, the form in which it's disinfectant properties are the
greatest is: - Answer-Hypochlorous acid
The chemical most commonly used to raise pH is: -
Answer-Sodium carbonate
An example of a chemical used to stabilize chlorine is: -
Answer-Cyanuric acid
The chemical reagent recommended by the health
department to test chlorine residual in swimming pools is: -
Answer-D.P.D.
The chemical reagent used most often to test pH in
swimming pools is: - Answer-Phenol red
Considering all factors, which of the following would be the
BEST range for pH in a swimming pool: - Answer-7.2-7.8
The percentage of hypoclorous acid formation is most
influenced by: - Answer-pH
,3|Page
Pool painting is usually done: - Answer-Before opening in
the spring
When a pool is chlorinated with gas chlorine, the operator
must also use: - Answer-Soda Ash
The term "chlorine demand" refers to: - Answer-The
amount of chlorine which will react with substances in the
pool
Re-circulation pumps used in swimming pools are the type
called: - Answer-Centrifugal pumps
Reversing the flow of water through the filters is called: -
Answer-Backwash
The minimum turnover rate to obtain 100% clarity in a pool
is: - Answer-Once in eight hours
There is a noticeable odor of chlorine around your pool
and bathers are complaining of eye irritation. Which of the
, 4|Page
following is most likely to solve the problem: - Answer-
Break point chlorination
As pH increases, chlorine effectiveness: - Answer-
Decreases
In a high-rate sand filter system, the tanks are
backwashed: - Answer-All at once
The baffle in the filter tank is there to: - Answer-Disperse
water evenly over the surface of the filter media
An access manhole is constructed on each tank in sand
and anthracite filter systems: - Answer-All of the above
A hair and lint strainer should be located: - Answer-Before
the pump and before the filter
Sodium hypochlorite used as a pool sanitizer also affects
the water pH in the following manner: - Answer-Raises
Chlorine gas will ________ the pH: - Answer-Lower
