ABC Wastewater Collection Level 3 Exam
Complete Questions and Guide Answers
100% Verified Graded A+
1. Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material
Answer: D. finely divided suspended material
2. The gas most commonly associated with septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane
, Answer: C. hydrogen sulfide
3. 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
4. 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
5. 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
6. 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
7. Metal pipes often fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis
Answer: C. galvanic action
8. 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
9. 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
10. 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
Complete Questions and Guide Answers
100% Verified Graded A+
1. Turbidity in wastewater is caused by
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material
Answer: D. finely divided suspended material
2. The gas most commonly associated with septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane
, Answer: C. hydrogen sulfide
3. 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
4. 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
5. 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
6. 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
7. Metal pipes often fail because of
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis
Answer: C. galvanic action
8. 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
9. 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
10. 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
