ABC WASTEWATER COLLECTION
SYSTEM OPERATOR III ACTUAL
VERIFIED 2025 QUESTIONS AND
ANSWERS
Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material - ANSWER-D. finely divided suspended
material
The gas most commonly associated with septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane - ANSWER-C. hydrogen sulfide
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62 - ANSWER-A. 0.44
Mechanical ventilation of a lift station is required to
A. lower temperatures to reduce proportion of hydrogen sulfide
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater - ANSWER-C. reduce corrosion
A wet well probe is usually used for ________ determination(s) of level.
A. approximate
,B. dual point
C. continuous
D. single point - ANSWER-D. single point
A pump is delivering at less than the expected rate of discharge. Which of
the causes listed below is incorrect?
A. speed of motor too low
B. pump not primed
C. impeller clogged
D. discharge head too low - ANSWER-D. discharge head too low
Metal pipes often fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis - ANSWER-C. galvanic action
When a fire hydrant is operated, it should be
A. just opened enough to have a flow
B. opened fully
C. opened halfway
D. regulated to flow required - ANSWER-B. opened fully
If the pump bearings on horizontal centrifugal pumps are over lubricated, the
most important effect is that the extra lubricant
A. will result in smoother and more efficient operation of the pump
B. will not make any difference in the operation of the pump
C. will be wasted
D. shaft or shaft sleeve will be damaged - ANSWER-D. shaft or shaft sleeve
will be damaged
If packing is not maintained properly,
A. cavitation damage will result
,B. impeller will corrode
C. loss of suction due to air being allowed to enter pump
D. shaft or shaft sleeve will be damaged - ANSWER-C. loss of suction due to
air being allowed to enter pump
In certain situations, a supervisor encourages the employees to make their
own decisions. This is considered to be
A. against the rules to follow past experiences in decision-making
B. bad form since the supervisor eventually loses control
C. highly desirable, since it encourages employee growth and frees the
D. supervisor for other tasks
E. passing the buck - ANSWER-C. highly desirable, since it encourages
employee growth
Successful communication requires mutual
A. agreement
B. confusion
C. transmission
D. understanding - ANSWER-D. understanding
When a great deal of authority is delegated on many levels, an organization
may be described as
A. authoritarian
B. centralized
C. decentralized
D. unstructured - ANSWER-C. decentralized
Recognition and job security are indications of
A. a good organization
B. a good supervisor
C. external morale factors
D. internal morale factors - ANSWER-A. a good organization
, Generally, as an individual progresses upward in management, reliance on
personal technical skill
A. changes to the more complex
B. decreases
C. increases
D. remains the same - ANSWER-B. decreases
Special parts that should be carried by the maintenance worker are usually
listed in the
A. machine blue print
B. machine history record
C. machine manufacturer's manual
D. work order - ANSWER-C. machine manufacturer's manual
How can the supervisor be certain that scheduled maintenance is
completed?
A. ask the workers
B. hire someone to inspect completed work
C. use a form that compares work assigned with work completed
D. wait and see if there are any failures - ANSWER-C. use a form that
compares work assigned with work completed
Word has just come down from the top that operating funds are being cut.
How should this be handled?
A. cut the supplies and repairs in order to balance the budget
B. fire some of the less-productive old employees
C. keep it quiet and do what you have to do--"The less said the better"
D. let the other personnel know what the situation is and ask for their help -
ANSWER-D. let the other personnel know what the situation is and ask for
their help
One opening has become available which would be an advancement to any
one of three qualified eager employees. How should this situation be
handled?
SYSTEM OPERATOR III ACTUAL
VERIFIED 2025 QUESTIONS AND
ANSWERS
Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material - ANSWER-D. finely divided suspended
material
The gas most commonly associated with septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane - ANSWER-C. hydrogen sulfide
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62 - ANSWER-A. 0.44
Mechanical ventilation of a lift station is required to
A. lower temperatures to reduce proportion of hydrogen sulfide
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater - ANSWER-C. reduce corrosion
A wet well probe is usually used for ________ determination(s) of level.
A. approximate
,B. dual point
C. continuous
D. single point - ANSWER-D. single point
A pump is delivering at less than the expected rate of discharge. Which of
the causes listed below is incorrect?
A. speed of motor too low
B. pump not primed
C. impeller clogged
D. discharge head too low - ANSWER-D. discharge head too low
Metal pipes often fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis - ANSWER-C. galvanic action
When a fire hydrant is operated, it should be
A. just opened enough to have a flow
B. opened fully
C. opened halfway
D. regulated to flow required - ANSWER-B. opened fully
If the pump bearings on horizontal centrifugal pumps are over lubricated, the
most important effect is that the extra lubricant
A. will result in smoother and more efficient operation of the pump
B. will not make any difference in the operation of the pump
C. will be wasted
D. shaft or shaft sleeve will be damaged - ANSWER-D. shaft or shaft sleeve
will be damaged
If packing is not maintained properly,
A. cavitation damage will result
,B. impeller will corrode
C. loss of suction due to air being allowed to enter pump
D. shaft or shaft sleeve will be damaged - ANSWER-C. loss of suction due to
air being allowed to enter pump
In certain situations, a supervisor encourages the employees to make their
own decisions. This is considered to be
A. against the rules to follow past experiences in decision-making
B. bad form since the supervisor eventually loses control
C. highly desirable, since it encourages employee growth and frees the
D. supervisor for other tasks
E. passing the buck - ANSWER-C. highly desirable, since it encourages
employee growth
Successful communication requires mutual
A. agreement
B. confusion
C. transmission
D. understanding - ANSWER-D. understanding
When a great deal of authority is delegated on many levels, an organization
may be described as
A. authoritarian
B. centralized
C. decentralized
D. unstructured - ANSWER-C. decentralized
Recognition and job security are indications of
A. a good organization
B. a good supervisor
C. external morale factors
D. internal morale factors - ANSWER-A. a good organization
, Generally, as an individual progresses upward in management, reliance on
personal technical skill
A. changes to the more complex
B. decreases
C. increases
D. remains the same - ANSWER-B. decreases
Special parts that should be carried by the maintenance worker are usually
listed in the
A. machine blue print
B. machine history record
C. machine manufacturer's manual
D. work order - ANSWER-C. machine manufacturer's manual
How can the supervisor be certain that scheduled maintenance is
completed?
A. ask the workers
B. hire someone to inspect completed work
C. use a form that compares work assigned with work completed
D. wait and see if there are any failures - ANSWER-C. use a form that
compares work assigned with work completed
Word has just come down from the top that operating funds are being cut.
How should this be handled?
A. cut the supplies and repairs in order to balance the budget
B. fire some of the less-productive old employees
C. keep it quiet and do what you have to do--"The less said the better"
D. let the other personnel know what the situation is and ask for their help -
ANSWER-D. let the other personnel know what the situation is and ask for
their help
One opening has become available which would be an advancement to any
one of three qualified eager employees. How should this situation be
handled?
