AK SEWAGE SYSTEM INSTALLER EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of an onsite sewage system?
A. Store drinking water
B. Treat and dispose of household wastewater
C. Increase water pressure
D. Collect stormwater
Answer: B. Treat and dispose of household wastewater
Rationale: An onsite sewage system receives wastewater,
provides treatment, and disperses the treated effluent safely
into the soil or another approved disposal method.
2. What is the main function of a septic tank?
A. Pump drinking water
B. Separate solids and liquids and provide anaerobic treatment
C. Chlorinate wastewater
D. Increase soil permeability
Answer: B. Separate solids and liquids and provide anaerobic
treatment
Rationale: Solids settle as sludge, fats and oils float as scum,
while liquid effluent leaves the tank for further treatment and
dispersal.
,3. Which material is commonly used for septic tank
construction?
A. Untreated cardboard
B. Concrete or approved plastic/fiberglass
C. Loose soil
D. Wood chips
Answer: B. Concrete or approved plastic/fiberglass
Rationale: Septic tanks must be structurally suitable,
watertight, and approved for sewage service.
4. What is the purpose of the septic tank inlet baffle?
A. Direct incoming sewage downward and reduce disturbance
of the tank contents
B. Pump sewage from the tank
C. Aerate the drainfield
D. Measure soil temperature
Answer: A. Direct incoming sewage downward and reduce
disturbance of the tank contents
Rationale: The inlet arrangement helps prevent incoming
wastewater from disturbing the settled sludge and floating
scum layers.
,5. What is the primary purpose of an outlet baffle or outlet
device?
A. Keep excessive solids from leaving the tank
B. Increase water pressure
C. Add disinfectant
D. Remove groundwater
Answer: A. Keep excessive solids from leaving the tank
Rationale: The outlet device helps draw relatively clear liquid
from the middle portion of the tank while retaining scum and
sludge.
6. What is the liquid portion of wastewater leaving a septic
tank called?
A. Sludge
B. Scum
C. Effluent
D. Aggregate
Answer: C. Effluent
Rationale: Effluent is the liquid wastewater discharged from
the septic tank to the treatment/dispersal system.
7. What causes sludge to accumulate in a septic tank?
A. Settling of wastewater solids
B. Evaporation of water
, C. Soil compaction
D. Rainfall
Answer: A. Settling of wastewater solids
Rationale: Heavier solids settle to the bottom and form the
sludge layer.
8. What is scum primarily composed of?
A. Floating fats, oils, grease, and other buoyant materials
B. Sand and gravel
C. Groundwater
D. Clean drinking water
Answer: A. Floating fats, oils, grease, and other buoyant
materials
Rationale: Materials lighter than water float and form the scum
layer.
9. Why must a septic tank be watertight?
A. To prevent leakage and infiltration
B. To increase sludge production
C. To allow groundwater into the tank
D. To eliminate the need for maintenance
Answer: A. To prevent leakage and infiltration
Rationale: A watertight tank prevents sewage leakage into
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of an onsite sewage system?
A. Store drinking water
B. Treat and dispose of household wastewater
C. Increase water pressure
D. Collect stormwater
Answer: B. Treat and dispose of household wastewater
Rationale: An onsite sewage system receives wastewater,
provides treatment, and disperses the treated effluent safely
into the soil or another approved disposal method.
2. What is the main function of a septic tank?
A. Pump drinking water
B. Separate solids and liquids and provide anaerobic treatment
C. Chlorinate wastewater
D. Increase soil permeability
Answer: B. Separate solids and liquids and provide anaerobic
treatment
Rationale: Solids settle as sludge, fats and oils float as scum,
while liquid effluent leaves the tank for further treatment and
dispersal.
,3. Which material is commonly used for septic tank
construction?
A. Untreated cardboard
B. Concrete or approved plastic/fiberglass
C. Loose soil
D. Wood chips
Answer: B. Concrete or approved plastic/fiberglass
Rationale: Septic tanks must be structurally suitable,
watertight, and approved for sewage service.
4. What is the purpose of the septic tank inlet baffle?
A. Direct incoming sewage downward and reduce disturbance
of the tank contents
B. Pump sewage from the tank
C. Aerate the drainfield
D. Measure soil temperature
Answer: A. Direct incoming sewage downward and reduce
disturbance of the tank contents
Rationale: The inlet arrangement helps prevent incoming
wastewater from disturbing the settled sludge and floating
scum layers.
,5. What is the primary purpose of an outlet baffle or outlet
device?
A. Keep excessive solids from leaving the tank
B. Increase water pressure
C. Add disinfectant
D. Remove groundwater
Answer: A. Keep excessive solids from leaving the tank
Rationale: The outlet device helps draw relatively clear liquid
from the middle portion of the tank while retaining scum and
sludge.
6. What is the liquid portion of wastewater leaving a septic
tank called?
A. Sludge
B. Scum
C. Effluent
D. Aggregate
Answer: C. Effluent
Rationale: Effluent is the liquid wastewater discharged from
the septic tank to the treatment/dispersal system.
7. What causes sludge to accumulate in a septic tank?
A. Settling of wastewater solids
B. Evaporation of water
, C. Soil compaction
D. Rainfall
Answer: A. Settling of wastewater solids
Rationale: Heavier solids settle to the bottom and form the
sludge layer.
8. What is scum primarily composed of?
A. Floating fats, oils, grease, and other buoyant materials
B. Sand and gravel
C. Groundwater
D. Clean drinking water
Answer: A. Floating fats, oils, grease, and other buoyant
materials
Rationale: Materials lighter than water float and form the scum
layer.
9. Why must a septic tank be watertight?
A. To prevent leakage and infiltration
B. To increase sludge production
C. To allow groundwater into the tank
D. To eliminate the need for maintenance
Answer: A. To prevent leakage and infiltration
Rationale: A watertight tank prevents sewage leakage into
