ABC WASTEWATER COLLECTIONS LEVEL II EXAM
(2025 LATEST UPDATE) QUESTIONS AND WELL
DETAILED ANSWERS| A+ GRADE
Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT ANSWER D. discharge head too low
Metal pipes often fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT ANSWER C. loss of suction due to
air being allowed to enter pump
(2025 LATEST UPDATE) QUESTIONS AND WELL
DETAILED ANSWERS| A+ GRADE
Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT ANSWER D. discharge head too low
Metal pipes often fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis -CORRECT 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 -CORRECT 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 -CORRECT 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 -CORRECT ANSWER C. loss of suction due to
air being allowed to enter pump
