PracticeVideosBlogFlashcardsEspañol
All Practice Exams

100+ Free AL Sewer Projects Practice Questions

Prepare for the Alabama Sewer Projects Contractor Examination exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately
100+ Questions
100% Free

Loading practice questions...

Same family resources

Explore More Alabama General Contractors Specialty Classifications

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Alabama Building Contractor Under Four Stories Examination

Practice Questions

Alabama Carpentry and Framing Contractor Examination

Practice Questions

Alabama Commercial Swimming Pool Contractor Examination

Practice Questions

Alabama Concrete Contractor Examination

Practice Questions

Alabama Concrete Pavement Contractor Examination

Practice Questions

Alabama Conveying Contractor Examination

Practice Questions
2026 Statistics

Key Facts: AL Sewer Projects Exam

70%

Passing Score

PSI AL GC Bulletin

50 Q

Official Exam Questions

PSI AL GC Bulletin

2 hours

Time Allowed

PSI AL GC Bulletin

$96

PSI Exam Fee

PSI AL GC Bulletin

Open book

Exam Format

PSI AL GC Bulletin

Alabama AL Sewer Projects trade exam via PSI: 50 questions, 70% pass, 2 hours, fee $96. Open-book specialty classification under the Alabama Licensing Board for General Contractors (bulletin 1/23/26).

Sample AL Sewer Projects Practice Questions

Try these sample questions to test your AL Sewer Projects exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary purpose of a gravity sanitary sewer main?
A.To pump wastewater under pressure to a treatment plant
B.To convey wastewater downhill by pipe slope without mechanical energy
C.To store peak wastewater flows until off-peak hours
D.To treat wastewater by biological oxidation in the pipe
Explanation: A gravity sewer is laid on a designed downward slope so wastewater flows by gravity alone from laterals and branches toward a lift station or treatment plant. No mechanical energy is added in the main itself. Pumping is the job of force mains; storage and treatment occur at other facilities.
2Which statement correctly describes a sanitary force main?
A.It flows partially full by gravity between manholes
B.It is a pressurized pipe that carries pumped wastewater from a lift station
C.It is used only for stormwater under road crossings
D.It must be installed flatter than any gravity sewer
Explanation: A force main operates full under pressure and carries wastewater discharged by pumps at a lift station to a higher-elevation gravity sewer or treatment works. Gravity sewers flow partially full; force mains are pressure-rated materials such as ductile iron or HDPE/PVC pressure pipe.
3Which pipe material is most commonly specified for new small-diameter gravity sanitary sewer mains?
A.Vitrified clay pipe only
B.PVC gravity sewer pipe such as ASTM D3034 SDR 35
C.Thin-wall corrugated metal storm pipe
D.Unreinforced thin-wall concrete
Explanation: PVC gravity sewer pipe meeting ASTM D3034 (commonly SDR 35) is the dominant material for new 4-inch to 15-inch sanitary mains because it is lightweight, corrosion-resistant, and has tight joints. Clay is largely legacy; corrugated metal is for storm drainage; thin unreinforced concrete is not standard for sanitary gravity mains.
4What approximate minimum design velocity is commonly required in a gravity sanitary sewer at design flow to keep solids moving?
A.0.5 feet per second
B.2.0 feet per second
C.10 feet per second
D.20 feet per second
Explanation: Design standards such as Recommended Standards for Wastewater Facilities (Ten States Standards) target about 2 feet per second at design flow so solids stay suspended and the pipe remains self-cleaning. Much lower velocities allow deposits; much higher velocities risk abrasion and hydraulic problems.
5According to common wastewater design standards, what is the approximate minimum slope for an 8-inch gravity sanitary sewer to maintain about 2 fps at design flow?
A.0.05 percent
B.0.40 percent
C.2.0 percent
D.4.0 percent
Explanation: Ten States Standards list a minimum slope of 0.40 feet per 100 feet (0.40%) for 8-inch sewers designed with Manning n = 0.013 to achieve roughly 2 fps when flowing full. Smaller pipes need steeper minimum slopes; larger pipes may be flatter.
6A gravity sewer drops 2.0 feet over a horizontal length of 500 feet. What is the pipe slope as a percent?
A.0.20%
B.0.40%
C.2.0%
D.4.0%
Explanation: Percent slope = (rise ÷ run) × 100. Here (2.0 ÷ 500) × 100 = 0.40%. That is the common minimum design slope for an 8-inch gravity sanitary sewer.
7Plans show an upstream manhole invert of 312.50 and a downstream manhole invert of 310.10, 400 feet apart. What is the percent grade of the sewer?
A.0.40%
B.0.60%
C.1.20%
D.2.40%
Explanation: Fall = 312.50 − 310.10 = 2.40 feet. Percent grade = (2.40 ÷ 400) × 100 = 0.60%. Always use invert elevations, not rim elevations, when computing sewer slope.
8What is the primary function of the channel and bench inside a sanitary manhole?
A.To support the frame and cover against traffic loads
B.To guide flow through the structure, reduce solids deposition, and provide a standing surface
C.To seal the manhole against surface water inflow
D.To provide an air-release point on a force main
Explanation: The formed channel continues the sewer invert through the manhole; the sloping bench beside the channel directs spill and solids into the flow and gives crews a footing surface. Frame support, chimney sealing, and force-main air valves are separate components or features.
9When is a drop manhole (drop connection) typically required?
A.Whenever two sewers of different diameters meet
B.When an influent sewer enters substantially higher than the manhole invert channel
C.Only on the last manhole before the treatment plant
D.Whenever the manhole is deeper than 4 feet
Explanation: A drop connection is used when an incoming sewer arrives well above the manhole channel (commonly about 2 feet or more of difference). The drop pipe carries flow down to the invert so the bench is not splashed and the structure remains usable.
10In a standard precast sanitary manhole, what is the purpose of grade (adjustment) rings in the chimney?
A.To form the flow channel in the base
B.To fine-tune final rim elevation to match finished grade
C.To replace the need for a cone section
D.To increase the diameter of the barrel
Explanation: Grade rings sit between the cone and the frame so the contractor can match the frame and cover to final pavement or ground elevation without rebuilding the entire manhole. The base channel, cone, and barrel diameter are separate design elements.

About the AL Sewer Projects Exam

The Alabama Sewer Projects Contractor Examination is a classification trade examination administered by PSI for the Alabama Licensing Board for General Contractors. The official open-book exam has 50 questions, a 70% (35 of 50 correct) passing standard, and 120 minutes allowed. PSI examination fee is $96 per attempt (bulletin updated 1/23/26). This English-language MCQ bank is a study aid for the trade knowledge on the official content outline; it is not an official PSI form, does not replace the required Business & Law exam for primes, and is not a substitute for board-approved experience or the official open-book examination.

Questions

50 scored questions

Time Limit

120 minutes

Passing Score

70%

Exam Fee

$96 (PSI Services LLC (for Alabama Licensing Board for General Contractors))

AL Sewer Projects Exam Content Outline

30%

Sewer Pipe Installation

Gravity and force-main installation

25%

Excavation and Trenching

Trenching and shoring

15%

Manholes and Structures

Manholes and appurtenances

15%

Testing and Safety

Testing, OSHA, and 1Call

15%

Plans and Estimating

Plans and estimating

How to Pass the AL Sewer Projects Exam

What You Need to Know

  • Passing score: 70%
  • Exam length: 50 questions
  • Time limit: 120 minutes
  • Exam fee: $96

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

AL Sewer Projects Study Tips from Top Performers

1Study only the approved references listed for your classification in the current PSI Alabama General Contractors bulletin
2Practice open-book navigation with permanent tabs and indexes before test day
3Drill OSHA 29 CFR 1926 topics that appear across nearly every trade outline
4Work quantity takeoff and plan-reading problems under timed conditions
5Confirm Board eligibility and classification scope on genconbd.alabama.gov before scheduling with PSI

Frequently Asked Questions

How many questions are on the AL Sewer Projects exam?

The official PSI trade examination has 50 scored questions (plus possible experimental items). Passing is 70% (35 of 50 correct) within 120 minutes.

How much does the AL Sewer Projects exam cost?

PSI lists $96 per examination registration for this Alabama general contractor classification exam (Candidate Information Bulletin updated 1/23/26). License application fees to the Board are separate.

Is the Alabama specialty contractor exam open book?

Yes. PSI administers these classification exams as open book. Only the bulletin-listed approved references are allowed; temporary tabs like Post-it notes are prohibited.

Do I still need the Business and Law exam?

Prime contractor applicants must also pass the Alabama Business & Law examination (50 questions, 70%, 120 minutes). Reciprocity may waive a trade exam in some cases but does not waive Business & Law.