ADEQ Wastewater Collections with
correct answers
A pump is delivering less than the expected rate of discharge. What can cause this to
happen?
A) Discharge head too low B) Discharge head too high C) Check valve open D) Pump is
primed - CORRECT ANSWER-B) Discharge head too high
Wearing rings are installed in a pump to - CORRECT ANSWER-Concentrate wear on
an economically replaceable pan
A lantern ring is a - CORRECT ANSWER-Spacer ring in a pump packing gland to
improve seat water distribution
Check valves are used on the discharge side of centrifugal pumps to - CORRECT
ANSWER-Prevent water in discharge line from flowing back
What information must be on a warning tag attached to a switch that has been locked
out? - CORRECT ANSWER-Signature of person who locked out the switch, who is the
only person authorized to remove tag
Enclosed, open, and semi-closed are terms used for the designation and selection of -
CORRECT ANSWER-Impellers
Leakage of seal water around the packing on a centrifugal pump is required because it
acts as a(n) - CORRECT ANSWER-Lubricant
Hydrogen sulfide is a toxic gas that smells like ____. At high concentrations of hydrogen
sulfide, however, the sense of smell is deadened and no odor is detected.
,A) Dead fish B) Fuel gas C) Rotten cabbage D) Rotten eggs - CORRECT ANSWER-
Rotten Eggs
Why are gasoline and volatile solvents objectionable where present in a sewer?
A) They produce an explosion hazard B) They tend to cause the solids to vaporize C)
They will coagulate floatables and cause stoppages D) They represent wasted
recourses - CORRECT ANSWER-A) They produce an explosion hazard
Biological activity in long, sluggish-flow, flat-grade sewer lines will likely
A) Decrease line sediment B) Create oxygen deficiency in the air in manholes, sewers,
or wet wells C) Stop toxic gas production D) Increase the "carrying capacity" of the line -
CORRECT ANSWER-B) Create oxygen deficiency in the air in manholes, sewers, or
wet wells
Task least likely to be preformed by collection systems personnel is
A) Cleaning sewer stoppages B) Making water connections C) Inspecting/testing
manholes D) Maintaining collection systems equipment - CORRECT ANSWER-B)
Making water connections
A pH of 6.0 is A) Acid B) Alkaline C) Neutral D) Basic - CORRECT ANSWER-A) Acid
Biological hazards in collection system operations include
A) Noxious or toxic gases or vapors B) Oxygen deficiency C) Physical injuries D)
Hepatitis A - CORRECT ANSWER-D) Hepatitis A
What must be checked before entering a manhole?
A) Atmosphere in manhole B) Safety equipment C) Proper barricades or warning
devices around a manhole D) All of the above - CORRECT ANSWER-D) All of the
above
In sewer maintenance, what is a pig?
A) A bullet shaped object passed through a force main B) A power rod C) Any foul
smelling equipment D) The hydraulic rodding truck - CORRECT ANSWER-A) A bullet
shaped object passed through a force main
The purpose pf ribs on the outside of a Wayne Sewer Ball is to - CORRECT ANSWER-
C) Cause jet action to aid in the hydraulic flushing of the sewer line
Mechanical ventilation of a lift station is required to - CORRECT ANSWER-Ensure safe
working access
,When opening a power rodder properly, do the following
A) Push the rodding tool into an obstruction and hold it there B) Rotate rod in one
position C) Make sure all the torque is out of a broken rod D) Rod past dropped joints or
through a crushed pipe - CORRECT ANSWER-C) Make sure all the torque is out of a
broken rod
You should get out of the manhole as soon as
A) Lower explosive level alarm activates B) H2S exceeds 5 ppm C) Flow increases
slightly D) None of the above - CORRECT ANSWER-A) Lower explosive level alarm
activates
A common name appurtenance used to keep an accidental flow of wastewater from
entering a building is called
A) Barrel B) Cleanout C) Backwater valve D) Catch basin - CORRECT ANSWER-C)
Backwater valve
Which of the following is a type of shore? A) Bar B) Aluminum hydraulic C) Truss D)
Sand - CORRECT ANSWER-B) Aluminum hydraulic
The most important traffic safety consideration is the
A) Time of day B) Size of the job C) Wearing of hard hats and safety vests D) Location
of the job - CORRECT ANSWER-Wearing of hard hats and safety vests
Which of the following first aid actions would you perform first if an operator inhales
chlorine gas?
A) Immediately remove victim from the contaminated area B) Immediately calla
physician or paramedic C) Immediately begin appropriate treatment D) Do nothing
because chlorine gas is nontoxic - CORRECT ANSWER-B) Immediately calla physician
or paramedic
Which of these chemicals may be used for odor control in sewers?
A) Chlorine B) Muriatic acid C) Potassium chloride D) Sodium chloride - CORRECT
ANSWER-A) Chlorine
Sources of excessively clear water in a collection system include
A) A problem at the wastewater treatment plant B) A sanitary sewer leak C) Exfiltration
from a high water table D) Infiltration from a high water table - CORRECT ANSWER-D)
Infiltration from a high water table
What information would you consider while clearing a stoppage in a sewer?
, A) Nothing-start adding pressurized water to clear the stoppage B) Cause of stoppage
C) Time of day D) Staffing requirements - CORRECT ANSWER-B) Cause of stoppage
With the completion of a sewer cleaning job, which one of the following must be done at
the manhole?
A) Complete and sign timesheets B) Wash down the truck C) Wash down street around
work area, making sure the wash water is broomed into the M.H. D) None of the above -
CORRECT ANSWER-Wash down street around work area, making sure the wash
water is broomed into the M.H.
Lift station failures include ________ failure. A) dip tube B) electrical system C) inverted
siphon D) All of the above - CORRECT ANSWER-B) electrical system
A kilowatt (KW) is equivalent to
A) .67 amperes at a voltage of 120 B) 746 watts C) 1.34 horsepower D) 1,000
megacycles - CORRECT ANSWER-C) 1.34 horsepower
Infiltration my result from
A) Bad joints B) Improper closed circuit television operation C) Poor ventilation D) Direct
downspout and drain connections - CORRECT ANSWER-A) Bad joints
Grease in sewers is mechanically removed by A) High-pressure jets B) Sawing C) Not
usually a problem in sewers D) Power rodders - CORRECT ANSWER-A) High-pressure
jets
The most important reason for washing hands thoroughly after taking a wastewater
sample is to
A) Avoid being infected by pathogenic bacteria B) Avoid contaminating BOD bottles C)
Avoid smudging BOD bottles D) Avoid accidentally dropping any glassware -
CORRECT ANSWER-A) Avoid being infected by pathogenic bacteria
Roots can enter collection systems through A) Air gaps B) Manhole covers C) Pipe
cracks D) Inflatable dams - CORRECT ANSWER-C) Pipe cracks
Which one of the following is a property of chlorine gas? A) Heavier than air B)
Harmless to humans C) Highly flammable D) Lighter than air - CORRECT ANSWER-A)
Heavier than air
What is a mechanical means to remove material from a sewer? A) Herbicides B) Cutting
C) Pumping D) Sweeping - CORRECT ANSWER-B) Cutting
correct answers
A pump is delivering less than the expected rate of discharge. What can cause this to
happen?
A) Discharge head too low B) Discharge head too high C) Check valve open D) Pump is
primed - CORRECT ANSWER-B) Discharge head too high
Wearing rings are installed in a pump to - CORRECT ANSWER-Concentrate wear on
an economically replaceable pan
A lantern ring is a - CORRECT ANSWER-Spacer ring in a pump packing gland to
improve seat water distribution
Check valves are used on the discharge side of centrifugal pumps to - CORRECT
ANSWER-Prevent water in discharge line from flowing back
What information must be on a warning tag attached to a switch that has been locked
out? - CORRECT ANSWER-Signature of person who locked out the switch, who is the
only person authorized to remove tag
Enclosed, open, and semi-closed are terms used for the designation and selection of -
CORRECT ANSWER-Impellers
Leakage of seal water around the packing on a centrifugal pump is required because it
acts as a(n) - CORRECT ANSWER-Lubricant
Hydrogen sulfide is a toxic gas that smells like ____. At high concentrations of hydrogen
sulfide, however, the sense of smell is deadened and no odor is detected.
,A) Dead fish B) Fuel gas C) Rotten cabbage D) Rotten eggs - CORRECT ANSWER-
Rotten Eggs
Why are gasoline and volatile solvents objectionable where present in a sewer?
A) They produce an explosion hazard B) They tend to cause the solids to vaporize C)
They will coagulate floatables and cause stoppages D) They represent wasted
recourses - CORRECT ANSWER-A) They produce an explosion hazard
Biological activity in long, sluggish-flow, flat-grade sewer lines will likely
A) Decrease line sediment B) Create oxygen deficiency in the air in manholes, sewers,
or wet wells C) Stop toxic gas production D) Increase the "carrying capacity" of the line -
CORRECT ANSWER-B) Create oxygen deficiency in the air in manholes, sewers, or
wet wells
Task least likely to be preformed by collection systems personnel is
A) Cleaning sewer stoppages B) Making water connections C) Inspecting/testing
manholes D) Maintaining collection systems equipment - CORRECT ANSWER-B)
Making water connections
A pH of 6.0 is A) Acid B) Alkaline C) Neutral D) Basic - CORRECT ANSWER-A) Acid
Biological hazards in collection system operations include
A) Noxious or toxic gases or vapors B) Oxygen deficiency C) Physical injuries D)
Hepatitis A - CORRECT ANSWER-D) Hepatitis A
What must be checked before entering a manhole?
A) Atmosphere in manhole B) Safety equipment C) Proper barricades or warning
devices around a manhole D) All of the above - CORRECT ANSWER-D) All of the
above
In sewer maintenance, what is a pig?
A) A bullet shaped object passed through a force main B) A power rod C) Any foul
smelling equipment D) The hydraulic rodding truck - CORRECT ANSWER-A) A bullet
shaped object passed through a force main
The purpose pf ribs on the outside of a Wayne Sewer Ball is to - CORRECT ANSWER-
C) Cause jet action to aid in the hydraulic flushing of the sewer line
Mechanical ventilation of a lift station is required to - CORRECT ANSWER-Ensure safe
working access
,When opening a power rodder properly, do the following
A) Push the rodding tool into an obstruction and hold it there B) Rotate rod in one
position C) Make sure all the torque is out of a broken rod D) Rod past dropped joints or
through a crushed pipe - CORRECT ANSWER-C) Make sure all the torque is out of a
broken rod
You should get out of the manhole as soon as
A) Lower explosive level alarm activates B) H2S exceeds 5 ppm C) Flow increases
slightly D) None of the above - CORRECT ANSWER-A) Lower explosive level alarm
activates
A common name appurtenance used to keep an accidental flow of wastewater from
entering a building is called
A) Barrel B) Cleanout C) Backwater valve D) Catch basin - CORRECT ANSWER-C)
Backwater valve
Which of the following is a type of shore? A) Bar B) Aluminum hydraulic C) Truss D)
Sand - CORRECT ANSWER-B) Aluminum hydraulic
The most important traffic safety consideration is the
A) Time of day B) Size of the job C) Wearing of hard hats and safety vests D) Location
of the job - CORRECT ANSWER-Wearing of hard hats and safety vests
Which of the following first aid actions would you perform first if an operator inhales
chlorine gas?
A) Immediately remove victim from the contaminated area B) Immediately calla
physician or paramedic C) Immediately begin appropriate treatment D) Do nothing
because chlorine gas is nontoxic - CORRECT ANSWER-B) Immediately calla physician
or paramedic
Which of these chemicals may be used for odor control in sewers?
A) Chlorine B) Muriatic acid C) Potassium chloride D) Sodium chloride - CORRECT
ANSWER-A) Chlorine
Sources of excessively clear water in a collection system include
A) A problem at the wastewater treatment plant B) A sanitary sewer leak C) Exfiltration
from a high water table D) Infiltration from a high water table - CORRECT ANSWER-D)
Infiltration from a high water table
What information would you consider while clearing a stoppage in a sewer?
, A) Nothing-start adding pressurized water to clear the stoppage B) Cause of stoppage
C) Time of day D) Staffing requirements - CORRECT ANSWER-B) Cause of stoppage
With the completion of a sewer cleaning job, which one of the following must be done at
the manhole?
A) Complete and sign timesheets B) Wash down the truck C) Wash down street around
work area, making sure the wash water is broomed into the M.H. D) None of the above -
CORRECT ANSWER-Wash down street around work area, making sure the wash
water is broomed into the M.H.
Lift station failures include ________ failure. A) dip tube B) electrical system C) inverted
siphon D) All of the above - CORRECT ANSWER-B) electrical system
A kilowatt (KW) is equivalent to
A) .67 amperes at a voltage of 120 B) 746 watts C) 1.34 horsepower D) 1,000
megacycles - CORRECT ANSWER-C) 1.34 horsepower
Infiltration my result from
A) Bad joints B) Improper closed circuit television operation C) Poor ventilation D) Direct
downspout and drain connections - CORRECT ANSWER-A) Bad joints
Grease in sewers is mechanically removed by A) High-pressure jets B) Sawing C) Not
usually a problem in sewers D) Power rodders - CORRECT ANSWER-A) High-pressure
jets
The most important reason for washing hands thoroughly after taking a wastewater
sample is to
A) Avoid being infected by pathogenic bacteria B) Avoid contaminating BOD bottles C)
Avoid smudging BOD bottles D) Avoid accidentally dropping any glassware -
CORRECT ANSWER-A) Avoid being infected by pathogenic bacteria
Roots can enter collection systems through A) Air gaps B) Manhole covers C) Pipe
cracks D) Inflatable dams - CORRECT ANSWER-C) Pipe cracks
Which one of the following is a property of chlorine gas? A) Heavier than air B)
Harmless to humans C) Highly flammable D) Lighter than air - CORRECT ANSWER-A)
Heavier than air
What is a mechanical means to remove material from a sewer? A) Herbicides B) Cutting
C) Pumping D) Sweeping - CORRECT ANSWER-B) Cutting
