AK Sewage System Installer Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
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1. What is the primary purpose of a sewage collection system?
a. To increase groundwater levels
b. To store drinking water
c. To collect and convey wastewater to an appropriate treatment or
disposal facility
d. To reduce the need for plumbing fixtures
Rationale: A sewage collection system is designed to safely collect
wastewater from buildings and transport it to a treatment plant,
septic system, or other approved disposal point. Proper collection
prevents uncontrolled discharge, odors, contamination, and public-
health hazards.
,2. Which factor is most important when selecting a sewage pipe
slope?
a. Pipe color
b. Maintaining adequate flow velocity while preventing excessive
erosion
c. The number of workers on the project
d. The brand of pipe
Rationale: Sewage pipes require an appropriate slope to maintain
self-cleansing flow. Too little slope can allow solids to settle, while
excessive slope can allow liquid to outrun solids and may contribute to
erosion or poor hydraulic performance.
3. What is the primary function of a sewer cleanout?
a. To increase water pressure
b. To measure groundwater
c. To provide access for inspection and removal of blockages
d. To disinfect sewage
Rationale: Cleanouts provide access to the sewer line so maintenance
personnel can inspect, cable, flush, or otherwise service the piping
system without excavating the entire line.
4. Which material is commonly used for modern gravity sewer piping?
,a. Untreated wood
b. Paperboard
c. PVC
d. Cloth
Rationale: PVC is widely used for sanitary sewer applications because
it is corrosion-resistant, relatively lightweight, and provides smooth
interior surfaces that reduce friction and facilitate wastewater flow.
5. What is the main purpose of a sewer manhole?
a. To supply potable water
b. To provide access to underground sewer piping for inspection and
maintenance
c. To increase sewage temperature
d. To prevent all groundwater movement
Rationale: Manholes provide access points for inspection, cleaning,
maintenance, and changes in sewer direction, elevation, or alignment.
6. Before excavating for a sewer installation, what should be done
first?
a. Begin trenching immediately
b. Place pipe in the excavation
c. Identify underground utilities and establish the planned excavation
, area
d. Fill the site with water
Rationale: Underground utility identification is a critical excavation
safety step. Contact with electric, gas, communication, or other buried
utilities can cause serious injury, fatalities, service interruptions, and
property damage.
7. What is the purpose of bedding beneath a sewer pipe?
a. To increase pipe temperature
b. To make the pipe heavier
c. To provide uniform support and help maintain the pipe's alignment
and grade
d. To eliminate the need for proper backfill
Rationale: Proper bedding supports the pipe uniformly and helps
prevent point loading, settlement, deformation, and loss of grade.
8. Why is proper trench backfill important?
a. It eliminates all future maintenance
b. It changes sewage into drinking water
c. It supports the pipe and limits settlement and movement
d. It increases the pipe's internal diameter
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a sewage collection system?
a. To increase groundwater levels
b. To store drinking water
c. To collect and convey wastewater to an appropriate treatment or
disposal facility
d. To reduce the need for plumbing fixtures
Rationale: A sewage collection system is designed to safely collect
wastewater from buildings and transport it to a treatment plant,
septic system, or other approved disposal point. Proper collection
prevents uncontrolled discharge, odors, contamination, and public-
health hazards.
,2. Which factor is most important when selecting a sewage pipe
slope?
a. Pipe color
b. Maintaining adequate flow velocity while preventing excessive
erosion
c. The number of workers on the project
d. The brand of pipe
Rationale: Sewage pipes require an appropriate slope to maintain
self-cleansing flow. Too little slope can allow solids to settle, while
excessive slope can allow liquid to outrun solids and may contribute to
erosion or poor hydraulic performance.
3. What is the primary function of a sewer cleanout?
a. To increase water pressure
b. To measure groundwater
c. To provide access for inspection and removal of blockages
d. To disinfect sewage
Rationale: Cleanouts provide access to the sewer line so maintenance
personnel can inspect, cable, flush, or otherwise service the piping
system without excavating the entire line.
4. Which material is commonly used for modern gravity sewer piping?
,a. Untreated wood
b. Paperboard
c. PVC
d. Cloth
Rationale: PVC is widely used for sanitary sewer applications because
it is corrosion-resistant, relatively lightweight, and provides smooth
interior surfaces that reduce friction and facilitate wastewater flow.
5. What is the main purpose of a sewer manhole?
a. To supply potable water
b. To provide access to underground sewer piping for inspection and
maintenance
c. To increase sewage temperature
d. To prevent all groundwater movement
Rationale: Manholes provide access points for inspection, cleaning,
maintenance, and changes in sewer direction, elevation, or alignment.
6. Before excavating for a sewer installation, what should be done
first?
a. Begin trenching immediately
b. Place pipe in the excavation
c. Identify underground utilities and establish the planned excavation
, area
d. Fill the site with water
Rationale: Underground utility identification is a critical excavation
safety step. Contact with electric, gas, communication, or other buried
utilities can cause serious injury, fatalities, service interruptions, and
property damage.
7. What is the purpose of bedding beneath a sewer pipe?
a. To increase pipe temperature
b. To make the pipe heavier
c. To provide uniform support and help maintain the pipe's alignment
and grade
d. To eliminate the need for proper backfill
Rationale: Proper bedding supports the pipe uniformly and helps
prevent point loading, settlement, deformation, and loss of grade.
8. Why is proper trench backfill important?
a. It eliminates all future maintenance
b. It changes sewage into drinking water
c. It supports the pipe and limits settlement and movement
d. It increases the pipe's internal diameter
