Alberta Plumber Apprenticeship Certification Practice Exam
2026 Alberta Plumber Apprenticeship
Certification Practice Exam 125
Questions and Answers with Rationales
Questions 1–25
1. What is the primary purpose of a plumbing trap?
A. Increase water pressure
B. Prevent sewer gases from entering the building
C. Reduce water temperature
D. Improve drainage speed
Answer: B
2. Which fitting changes the direction of pipe flow by 90°?
A. Coupling
B. Union
C. Elbow
D. Reducer
Answer: C
3. Copper tubing for potable water is commonly joined by:
A. Welding only
B. Solvent cement
C. Soldering or brazing
D. Threading only
Answer: C
4. DWV stands for:
A. Drain, Waste, and Vent
B. Domestic Water Valve
, Alberta Plumber Apprenticeship Certification Practice Exam
C. Distribution Water Vent
D. Drain Water Vacuum
Answer: A
5. Before working on an energized electrical component connected to plumbing equipment,
the first step is to:
A. Remove the pump
B. Shut off and lock out the power source
C. Open nearby faucets
D. Increase water pressure
Answer: B
6. Which valve prevents reverse flow into a potable water system?
A. Gate valve
B. Ball valve
C. Backflow preventer
D. Globe valve
Answer: C
7. PVC pipe is normally joined using:
A. Solder
B. Compression fittings only
C. Solvent cement
D. Welding
Answer: C
8. Which tool is most appropriate for cutting copper tubing?
A. Pipe wrench
B. Tubing cutter
, Alberta Plumber Apprenticeship Certification Practice Exam
C. Cold chisel
D. Tin snips
Answer: B
9. A vent in a plumbing system primarily serves to:
A. Increase water temperature
B. Equalize air pressure within the drainage system
C. Filter wastewater
D. Reduce pipe size
Answer: B
10. The main function of a pressure-reducing valve is to:
A. Increase flow rate
B. Reduce excessive water pressure
C. Prevent freezing
D. Remove sediment
Answer: B
11. Which material is commonly used for underground building sewers?
A. ABS or PVC
B. Brass
C. Galvanized steel only
D. Aluminum
Answer: A
12. What instrument measures water pressure?
A. Thermometer
B. Pressure gauge
C. Micrometer
D. Transit
, Alberta Plumber Apprenticeship Certification Practice Exam
Answer: B
13. Which fitting allows a pipe to be disconnected without cutting it?
A. Union
B. Tee
C. Coupling
D. Bushing
Answer: A
14. What PPE should always be worn when cutting pipe?
A. Sandals
B. Safety glasses
C. Hearing aid only
D. Cotton gloves only
Answer: B
15. A check valve permits flow:
A. In both directions equally
B. In one direction only
C. Only upward
D. Only downward
Answer: B
16. Pipe slope in a drainage system primarily helps:
A. Increase pressure
B. Ensure gravity drainage
C. Prevent freezing
D. Reduce pipe expansion
Answer: B
2026 Alberta Plumber Apprenticeship
Certification Practice Exam 125
Questions and Answers with Rationales
Questions 1–25
1. What is the primary purpose of a plumbing trap?
A. Increase water pressure
B. Prevent sewer gases from entering the building
C. Reduce water temperature
D. Improve drainage speed
Answer: B
2. Which fitting changes the direction of pipe flow by 90°?
A. Coupling
B. Union
C. Elbow
D. Reducer
Answer: C
3. Copper tubing for potable water is commonly joined by:
A. Welding only
B. Solvent cement
C. Soldering or brazing
D. Threading only
Answer: C
4. DWV stands for:
A. Drain, Waste, and Vent
B. Domestic Water Valve
, Alberta Plumber Apprenticeship Certification Practice Exam
C. Distribution Water Vent
D. Drain Water Vacuum
Answer: A
5. Before working on an energized electrical component connected to plumbing equipment,
the first step is to:
A. Remove the pump
B. Shut off and lock out the power source
C. Open nearby faucets
D. Increase water pressure
Answer: B
6. Which valve prevents reverse flow into a potable water system?
A. Gate valve
B. Ball valve
C. Backflow preventer
D. Globe valve
Answer: C
7. PVC pipe is normally joined using:
A. Solder
B. Compression fittings only
C. Solvent cement
D. Welding
Answer: C
8. Which tool is most appropriate for cutting copper tubing?
A. Pipe wrench
B. Tubing cutter
, Alberta Plumber Apprenticeship Certification Practice Exam
C. Cold chisel
D. Tin snips
Answer: B
9. A vent in a plumbing system primarily serves to:
A. Increase water temperature
B. Equalize air pressure within the drainage system
C. Filter wastewater
D. Reduce pipe size
Answer: B
10. The main function of a pressure-reducing valve is to:
A. Increase flow rate
B. Reduce excessive water pressure
C. Prevent freezing
D. Remove sediment
Answer: B
11. Which material is commonly used for underground building sewers?
A. ABS or PVC
B. Brass
C. Galvanized steel only
D. Aluminum
Answer: A
12. What instrument measures water pressure?
A. Thermometer
B. Pressure gauge
C. Micrometer
D. Transit
, Alberta Plumber Apprenticeship Certification Practice Exam
Answer: B
13. Which fitting allows a pipe to be disconnected without cutting it?
A. Union
B. Tee
C. Coupling
D. Bushing
Answer: A
14. What PPE should always be worn when cutting pipe?
A. Sandals
B. Safety glasses
C. Hearing aid only
D. Cotton gloves only
Answer: B
15. A check valve permits flow:
A. In both directions equally
B. In one direction only
C. Only upward
D. Only downward
Answer: B
16. Pipe slope in a drainage system primarily helps:
A. Increase pressure
B. Ensure gravity drainage
C. Prevent freezing
D. Reduce pipe expansion
Answer: B
