Class D Water Operator Exam Study Guide with Questions and Answers – 100%
Solved
_______ is the final step in removing suspended matter and chlorine resistant microorganisms. -
✔✔✔-Filtration
____________ is buildup of oxidized iron, calcium carbonate, or other chemicals in mains. High
pressure water, pigs or swabs, and chemicals are methods of removing scale. - ✔✔✔-
Tuberculation
_____________ is the process where ice and snow evaporate into the atmosphere without first
melting into a liquid form. - ✔✔✔-Sublimation
1 psi = ________ ft of water column - ✔✔✔-2.31
A common filter is the rapid sand filter, which filters ____ gpm/ft2 of filter media. - ✔✔✔-2
A cross connection is a physical connection between a public water system and:
- another supply of _________ quality
- any source that may contain _________
-any water treated to a __________ degree - ✔✔✔-unknown or questionable
contamination
lesser
A safety program must start with support from the _________, then extend to all employees. -
✔✔✔-top official
A sand filter has _____ to ____ inches of porous material such as sand or anthracite coal, called
filter media. - ✔✔✔-24" to 30"
,Class D Water Operator Exam Study Guide with Questions and Answers – 100%
Solved
A scale called the ________ measures odor. - ✔✔✔-Threshold Odor Number (TON)
A standpipe is considered ground storage unless it exceeds _____ft above the highest service
connection. - ✔✔✔-80
A system's filtered water must be _______ Nephelometric Turbidity Units (NTU) or less in at
least 95% of the measurements taken each month, and no sample can exceed _____ NTU. -
✔✔✔-0.3
1
A tank resting on the ground that is greater in height than diameter is called a _________. -
✔✔✔-standpipe
A water system with ground storage is allowed pressure tank capacity of ______ gallons per
connection. - ✔✔✔-20 gallons per connection
A water system without ground storage must have pressure tank capacity of _____ gallons per
connection. - ✔✔✔-50 gallons per connection
According to OSHA, soil that has previously been disturbed is classified as soil type _________. -
✔✔✔-C
According to OSHA, three criteria classify a _____________.
1) large enough and so configured that an employee may enter and do work;
2) has limited or restricted means of entry or exit;
3) is not designed for continuous occupancy. - ✔✔✔-confined space
, Class D Water Operator Exam Study Guide with Questions and Answers – 100%
Solved
After the floc forms, the water flows into a sedimentation basin. A detention time of at least
____ hours is required to allow the floc to settle. - ✔✔✔-6
All activities shall be restricted within _____ feet of a surface water treatment plant intake. -
✔✔✔-200
All community and non-transient, non-community water systems must not exceed a maximum
free chlorine or chloramine residual of ______ mg/L based on the running annual average of all
distribution samples. - ✔✔✔-4 mg/L
All ground storage tanks must have an access opening at least _______ inch diameter. - ✔✔✔-
30"
An exterior and interior inspection of all tanks must be conducted how often? How long must
the documented inspection results be kept? - ✔✔✔-Yearly inspection required, keep results 5
years
As the solids increase, there will be a loss of head pressure through the filter due to increased
friction. When this head loss is about ____ to _____ feet, the filter must be backwashed. -
✔✔✔-6-10 feet
At what level will fluoride cause mottling of teeth, a condition known as fluorosis? - ✔✔✔-4.0
mg/L
Bacteriological samples must be recieved by the lab within _____ hours or they are rejected.
Cool the samples on ice prior to and during transport. Keep samples off dashboards. Heat
stimulates biological growth! - ✔✔✔-30
Can dissolved solids be removed by filtration? - ✔✔✔-No
Solved
_______ is the final step in removing suspended matter and chlorine resistant microorganisms. -
✔✔✔-Filtration
____________ is buildup of oxidized iron, calcium carbonate, or other chemicals in mains. High
pressure water, pigs or swabs, and chemicals are methods of removing scale. - ✔✔✔-
Tuberculation
_____________ is the process where ice and snow evaporate into the atmosphere without first
melting into a liquid form. - ✔✔✔-Sublimation
1 psi = ________ ft of water column - ✔✔✔-2.31
A common filter is the rapid sand filter, which filters ____ gpm/ft2 of filter media. - ✔✔✔-2
A cross connection is a physical connection between a public water system and:
- another supply of _________ quality
- any source that may contain _________
-any water treated to a __________ degree - ✔✔✔-unknown or questionable
contamination
lesser
A safety program must start with support from the _________, then extend to all employees. -
✔✔✔-top official
A sand filter has _____ to ____ inches of porous material such as sand or anthracite coal, called
filter media. - ✔✔✔-24" to 30"
,Class D Water Operator Exam Study Guide with Questions and Answers – 100%
Solved
A scale called the ________ measures odor. - ✔✔✔-Threshold Odor Number (TON)
A standpipe is considered ground storage unless it exceeds _____ft above the highest service
connection. - ✔✔✔-80
A system's filtered water must be _______ Nephelometric Turbidity Units (NTU) or less in at
least 95% of the measurements taken each month, and no sample can exceed _____ NTU. -
✔✔✔-0.3
1
A tank resting on the ground that is greater in height than diameter is called a _________. -
✔✔✔-standpipe
A water system with ground storage is allowed pressure tank capacity of ______ gallons per
connection. - ✔✔✔-20 gallons per connection
A water system without ground storage must have pressure tank capacity of _____ gallons per
connection. - ✔✔✔-50 gallons per connection
According to OSHA, soil that has previously been disturbed is classified as soil type _________. -
✔✔✔-C
According to OSHA, three criteria classify a _____________.
1) large enough and so configured that an employee may enter and do work;
2) has limited or restricted means of entry or exit;
3) is not designed for continuous occupancy. - ✔✔✔-confined space
, Class D Water Operator Exam Study Guide with Questions and Answers – 100%
Solved
After the floc forms, the water flows into a sedimentation basin. A detention time of at least
____ hours is required to allow the floc to settle. - ✔✔✔-6
All activities shall be restricted within _____ feet of a surface water treatment plant intake. -
✔✔✔-200
All community and non-transient, non-community water systems must not exceed a maximum
free chlorine or chloramine residual of ______ mg/L based on the running annual average of all
distribution samples. - ✔✔✔-4 mg/L
All ground storage tanks must have an access opening at least _______ inch diameter. - ✔✔✔-
30"
An exterior and interior inspection of all tanks must be conducted how often? How long must
the documented inspection results be kept? - ✔✔✔-Yearly inspection required, keep results 5
years
As the solids increase, there will be a loss of head pressure through the filter due to increased
friction. When this head loss is about ____ to _____ feet, the filter must be backwashed. -
✔✔✔-6-10 feet
At what level will fluoride cause mottling of teeth, a condition known as fluorosis? - ✔✔✔-4.0
mg/L
Bacteriological samples must be recieved by the lab within _____ hours or they are rejected.
Cool the samples on ice prior to and during transport. Keep samples off dashboards. Heat
stimulates biological growth! - ✔✔✔-30
Can dissolved solids be removed by filtration? - ✔✔✔-No
