1|Page
Ohio Wastewater Operator Class A Exam Actual Test
||Verified Exam!!||Questions and Correct Answers With
Rationales LATEST THIS YEAR.pdf 1||NEWEST
EXAM!!
What does not pose a threat to human health in the
drinking water? - Answer-Iron
HPC and Coliform tests are the same because they both?
- Answer-Have a volume of 100mL and the initial
incubation period is 24hrs at 35 degrees Celsius
Improper backwashing of the filter media can lead to? -
Answer-Mudball Formation
What are the chemical symbols for hypochlorous acid and
hypochlorite ions? - Answer-HOCI & OCI-
When pumping from Well #1 the static level of Well #2
drops. What causes this? - Answer-Overlapping Fields of
Influence
,2|Page
Records of chemical analyses should be kept for? -
Answer-10 years
If the chlorine demand suddenly increases from 0.4 mg/L
to 2.8 mg/L, what could be the reason? - Answer-Pollution
What type of filtration is permitted under the Surface Water
Treatment Rule? - Answer-Conventional, Direct, Slow
Sand, and Diatomaceous Earth Filters
What chemical can be added to the water system to
sequester Iron and Manganese? - Answer-
Polyphosphates
Bar screens are used to? - Answer-Remove Debris
Which is the most persistent protozoa? - Answer-
Cryptosporidium parvum
What is a major cause of short circuiting in a
sedimentation basin? - Answer-Poor Inlet Baffling
, 3|Page
A connection between a potable water system and a non
potable water system is? - Answer-A Cross-Connection
What makes chlorine use more advantageous over
chloramines? - Answer-It is a much stronger oxidant
What type of sedimentation basins have the flow of water
admitted at an angle? - Answer-Spiral Flow Basins
The water purveyor must post the Consumer Confidence
Report on a publicly accessible web site if it serves more
than how many people? - Answer-100,000 people
What advantage over Aluminum Sulfate does Ferric
Sulfate have? - Answer-More Dense Floc
Protozoa are larger than bacteria which are larger than
viruses. - Answer-True
The injection of fluoride should be as far away as possible
from any chemical containing? - Answer-Calcium
Ohio Wastewater Operator Class A Exam Actual Test
||Verified Exam!!||Questions and Correct Answers With
Rationales LATEST THIS YEAR.pdf 1||NEWEST
EXAM!!
What does not pose a threat to human health in the
drinking water? - Answer-Iron
HPC and Coliform tests are the same because they both?
- Answer-Have a volume of 100mL and the initial
incubation period is 24hrs at 35 degrees Celsius
Improper backwashing of the filter media can lead to? -
Answer-Mudball Formation
What are the chemical symbols for hypochlorous acid and
hypochlorite ions? - Answer-HOCI & OCI-
When pumping from Well #1 the static level of Well #2
drops. What causes this? - Answer-Overlapping Fields of
Influence
,2|Page
Records of chemical analyses should be kept for? -
Answer-10 years
If the chlorine demand suddenly increases from 0.4 mg/L
to 2.8 mg/L, what could be the reason? - Answer-Pollution
What type of filtration is permitted under the Surface Water
Treatment Rule? - Answer-Conventional, Direct, Slow
Sand, and Diatomaceous Earth Filters
What chemical can be added to the water system to
sequester Iron and Manganese? - Answer-
Polyphosphates
Bar screens are used to? - Answer-Remove Debris
Which is the most persistent protozoa? - Answer-
Cryptosporidium parvum
What is a major cause of short circuiting in a
sedimentation basin? - Answer-Poor Inlet Baffling
, 3|Page
A connection between a potable water system and a non
potable water system is? - Answer-A Cross-Connection
What makes chlorine use more advantageous over
chloramines? - Answer-It is a much stronger oxidant
What type of sedimentation basins have the flow of water
admitted at an angle? - Answer-Spiral Flow Basins
The water purveyor must post the Consumer Confidence
Report on a publicly accessible web site if it serves more
than how many people? - Answer-100,000 people
What advantage over Aluminum Sulfate does Ferric
Sulfate have? - Answer-More Dense Floc
Protozoa are larger than bacteria which are larger than
viruses. - Answer-True
The injection of fluoride should be as far away as possible
from any chemical containing? - Answer-Calcium
