ABC WASTEWATER LEVEL 3 CERTIFICATION EXAM
QUESTIONBANK ACTUAL EXAM QUESTIONS AND
DETAILED CORRECT ANSWERS LATEST 2027
Occasionally some of the people on a work crew will indulge in active horseplay.
This should be
A. discouraged because some of the workers might not like it
B. encourage because it promotes good fellowship
C. permitted as it is a form of relaxation
D. stopped immediately because it is likely to cause an accident - ANSWER -D.
stopped immediately because it is likely to cause an accident
The temperature versus DO relationship for wastewater is such that the
A. higher the temperature, the higher the DO saturation level
B. higher the temperature, the lower the DO saturation level
C. lower the temperature, the lower the DO saturation level
D. none of the above - ANSWER -B. higher the temperature, the lower the DO
saturation level
The gas most commonly associated with fresh wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. oxygen - ANSWER -D. oxygen
"Hz" stands for
A. cycles per second
B. hand control
C. horizontal phase
D. polyphase - ANSWER -A. cycles per second
Anaerobic wastewater is frequently corrosive to materials it contacts, especially
A. coal tar enamel
B. concrete
C. copper
D. plastic - ANSWER -B. concrete
,The electrical disconnect for a pumping station motor can trip out under which
one(s) of the following possibilities?
A. clogged pump inlet
B. low temperature
C. strike by lightning
D. worn packing - ANSWER -C. strike by lightning
One of the electric motors in the facility has overheated and caught fire. Select the
correct sequence of steps you would take.
1. extinguish fire
2. test
3. repair
4. shut off power
5. remove tags and locks
6. ascertain cause
7. tag and lock out power
A. 1, 2, 6, 4, 7, 3, 5
B. 1, 4, 6, 7, 2, 3, 5
C. 4, 1, 7, 6, 3, 5, 2
D. 4, 6, 1, 7, 3, 5, 2 - ANSWER -C. 4, 1, 7, 6, 3, 5, 2
Pipe materials that are the least susceptible to corrosion by acids formed from
gases generated in sewers are
A. ACP
B. CIP
C. RCP
D. VCP - ANSWER -D. VCP
One-ton chlorine tanks
A. have fusible plugs located at valves
B. must be stored in an upright position
C. remove liquid chlorine from the top valve
D. should have locking devices to prevent the tanks from rolling when connected -
ANSWER -D. should have locking devices to prevent the tanks from rolling when
connected
The level of water can be measured by
A. bubblers
B. electrical probes
C. floats
,D. all of the above - ANSWER -D. all of the above
To test if a 110 VAC outlet is hot, set VOM for
A. 100 amps
B. 100 VAC
C. 250 amps
D. 250 VAC - ANSWER -D. 250 VAC
A chlorine gas mask should be provided
A. just outside the chlorine room door
B. just inside the chlorine room door
C. in the plant superintendent's office
D. in a locked tamper-proof container - ANSWER -A. just outside the chlorine
room door
Chlorine cylinders should be stored
A. below ground level
B. in a clean, dry location
C. on their side
D. with the protective caps off - ANSWER -B. in a clean, dry location
At a pumping station equipped with centrifugal pumps, what caused the discharge
pressure to suddenly increase and the discharge quantity to suddenly decrease?
A. a discharge valve was closed
B. a suction valve was closed
C. the pump amperage was decreased
D. the voltage was suddenly increased - ANSWER -A. a discharge valve was
closed
To sample for pH, you should collect a
A. composite sample
B. continuous sample
C. grab sample
D. regulated sample - ANSWER -C. grab sample
You have been directed to examine and review the plans and specifications for a
new wastewater pump station prior to the advertising for construction bids. Which
of the following is of least significance to your review?
A. the clearance around and above pumps, motors, valves and control switch gear
B. the provisions for ingress and egress for both wet well and dry well
, C. the size and geometry of the wet well
D. the specific colors for all piping - ANSWER -D. the specific colors for all
piping
Which one(s) of the following items should be inspected when responding to a lift
station alarm at night?
A. dry well
B. motor control center and power panel
C. operation of ventilation equipment
D. all of the above - ANSWER -D. all of the above
How many pounds of chlorine gas can be drawn from a 150 pound cylinder in a
24-hour period at ordinary room temperature?
A. 20
B. 40
C. 60
D. 65 - ANSWER -B. 40
When litmus paper is immersed in an acid solution, the paper turns
A. blue
B. red
C. violet
D. yellow - ANSWER -B. red
What is the greatest distance at which manholes should be installed for an 8-inch
sewer line?
A. 100 feet
B. 200 feet
C. 300 feet
D. 400 feet - ANSWER -C. 300 feet
Disaster planning is
A. having manuals ready so they can be read if a disaster occurs
B. something that, if properly done, will not need to be revised
C. useful in reducing confusion in the event of a disaster
D. none of the above - ANSWER -C. useful in reducing confusion in the event of
a disaster
The best discipline is
A. authoritarian
QUESTIONBANK ACTUAL EXAM QUESTIONS AND
DETAILED CORRECT ANSWERS LATEST 2027
Occasionally some of the people on a work crew will indulge in active horseplay.
This should be
A. discouraged because some of the workers might not like it
B. encourage because it promotes good fellowship
C. permitted as it is a form of relaxation
D. stopped immediately because it is likely to cause an accident - ANSWER -D.
stopped immediately because it is likely to cause an accident
The temperature versus DO relationship for wastewater is such that the
A. higher the temperature, the higher the DO saturation level
B. higher the temperature, the lower the DO saturation level
C. lower the temperature, the lower the DO saturation level
D. none of the above - ANSWER -B. higher the temperature, the lower the DO
saturation level
The gas most commonly associated with fresh wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. oxygen - ANSWER -D. oxygen
"Hz" stands for
A. cycles per second
B. hand control
C. horizontal phase
D. polyphase - ANSWER -A. cycles per second
Anaerobic wastewater is frequently corrosive to materials it contacts, especially
A. coal tar enamel
B. concrete
C. copper
D. plastic - ANSWER -B. concrete
,The electrical disconnect for a pumping station motor can trip out under which
one(s) of the following possibilities?
A. clogged pump inlet
B. low temperature
C. strike by lightning
D. worn packing - ANSWER -C. strike by lightning
One of the electric motors in the facility has overheated and caught fire. Select the
correct sequence of steps you would take.
1. extinguish fire
2. test
3. repair
4. shut off power
5. remove tags and locks
6. ascertain cause
7. tag and lock out power
A. 1, 2, 6, 4, 7, 3, 5
B. 1, 4, 6, 7, 2, 3, 5
C. 4, 1, 7, 6, 3, 5, 2
D. 4, 6, 1, 7, 3, 5, 2 - ANSWER -C. 4, 1, 7, 6, 3, 5, 2
Pipe materials that are the least susceptible to corrosion by acids formed from
gases generated in sewers are
A. ACP
B. CIP
C. RCP
D. VCP - ANSWER -D. VCP
One-ton chlorine tanks
A. have fusible plugs located at valves
B. must be stored in an upright position
C. remove liquid chlorine from the top valve
D. should have locking devices to prevent the tanks from rolling when connected -
ANSWER -D. should have locking devices to prevent the tanks from rolling when
connected
The level of water can be measured by
A. bubblers
B. electrical probes
C. floats
,D. all of the above - ANSWER -D. all of the above
To test if a 110 VAC outlet is hot, set VOM for
A. 100 amps
B. 100 VAC
C. 250 amps
D. 250 VAC - ANSWER -D. 250 VAC
A chlorine gas mask should be provided
A. just outside the chlorine room door
B. just inside the chlorine room door
C. in the plant superintendent's office
D. in a locked tamper-proof container - ANSWER -A. just outside the chlorine
room door
Chlorine cylinders should be stored
A. below ground level
B. in a clean, dry location
C. on their side
D. with the protective caps off - ANSWER -B. in a clean, dry location
At a pumping station equipped with centrifugal pumps, what caused the discharge
pressure to suddenly increase and the discharge quantity to suddenly decrease?
A. a discharge valve was closed
B. a suction valve was closed
C. the pump amperage was decreased
D. the voltage was suddenly increased - ANSWER -A. a discharge valve was
closed
To sample for pH, you should collect a
A. composite sample
B. continuous sample
C. grab sample
D. regulated sample - ANSWER -C. grab sample
You have been directed to examine and review the plans and specifications for a
new wastewater pump station prior to the advertising for construction bids. Which
of the following is of least significance to your review?
A. the clearance around and above pumps, motors, valves and control switch gear
B. the provisions for ingress and egress for both wet well and dry well
, C. the size and geometry of the wet well
D. the specific colors for all piping - ANSWER -D. the specific colors for all
piping
Which one(s) of the following items should be inspected when responding to a lift
station alarm at night?
A. dry well
B. motor control center and power panel
C. operation of ventilation equipment
D. all of the above - ANSWER -D. all of the above
How many pounds of chlorine gas can be drawn from a 150 pound cylinder in a
24-hour period at ordinary room temperature?
A. 20
B. 40
C. 60
D. 65 - ANSWER -B. 40
When litmus paper is immersed in an acid solution, the paper turns
A. blue
B. red
C. violet
D. yellow - ANSWER -B. red
What is the greatest distance at which manholes should be installed for an 8-inch
sewer line?
A. 100 feet
B. 200 feet
C. 300 feet
D. 400 feet - ANSWER -C. 300 feet
Disaster planning is
A. having manuals ready so they can be read if a disaster occurs
B. something that, if properly done, will not need to be revised
C. useful in reducing confusion in the event of a disaster
D. none of the above - ANSWER -C. useful in reducing confusion in the event of
a disaster
The best discipline is
A. authoritarian
