PEI Plumber Certification Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which authority regulates plumber certification in Prince Edward
Island?
A. Service Canada
B. Red Seal Program
C. PEI Department of Workforce, Advanced Learning and
Population
D. Atlantic Plumbing Association
Italicized rationale: Plumbing certification in PEI is administered by
the provincial government authority responsible for trades.
2. Which system supplies potable water to fixtures?
A. Drainage system
B. Vent system
C. Water distribution system
D. Storm system
Italicized rationale: Potable water is delivered through the water
distribution system.
3. Which pipe material is commonly used for cold water distribution
in residential buildings?
A. Cast iron
B. PEX
, C. Clay
D. Concrete
Italicized rationale: PEX is widely approved for residential cold
water systems.
4. What is the main purpose of a plumbing vent?
A. Increase pressure
B. Drain water faster
C. Prevent trap siphonage
D. Filter air
Italicized rationale: Vents protect trap seals by equalizing pressure.
5. A trap seal primarily prevents what?
A. Water leakage
B. Pipe corrosion
C. Sewer gas entry
D. Backflow
Italicized rationale: The water in the trap blocks sewer gases.
6. Minimum trap seal depth is generally:
A. 10 mm
B. 25 mm
C. 50 mm
D. 100 mm
Italicized rationale: Plumbing codes typically require a minimum
50 mm trap seal.
7. Which fitting creates the least resistance to flow?
A. Tee
B. 90° elbow
C. 45° elbow
, D. Sanitary tee
Italicized rationale: A 45° elbow provides smoother directional
change.
8. Which slope is commonly required for horizontal drainage piping?
A. 1/16 inch per foot
B. 1/4 inch per foot
C. 1 inch per foot
D. Level
Italicized rationale: Proper slope ensures self-cleaning flow.
9. What does DWV stand for?
A. Drain Water Valve
B. Drain, Waste, and Vent
C. Domestic Water Volume
D. Distribution Water Vent
Italicized rationale: DWV systems remove waste and vent gases.
10. Which fixture requires a trap?
A. Water heater
B. Hose bib
C. Floor drain
D. Vent stack
Italicized rationale: Drains must have traps to prevent sewer
gases.
11. Backflow prevention protects against:
A. High pressure
B. Leakage
C. Contamination of potable water
D. Pipe freezing
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which authority regulates plumber certification in Prince Edward
Island?
A. Service Canada
B. Red Seal Program
C. PEI Department of Workforce, Advanced Learning and
Population
D. Atlantic Plumbing Association
Italicized rationale: Plumbing certification in PEI is administered by
the provincial government authority responsible for trades.
2. Which system supplies potable water to fixtures?
A. Drainage system
B. Vent system
C. Water distribution system
D. Storm system
Italicized rationale: Potable water is delivered through the water
distribution system.
3. Which pipe material is commonly used for cold water distribution
in residential buildings?
A. Cast iron
B. PEX
, C. Clay
D. Concrete
Italicized rationale: PEX is widely approved for residential cold
water systems.
4. What is the main purpose of a plumbing vent?
A. Increase pressure
B. Drain water faster
C. Prevent trap siphonage
D. Filter air
Italicized rationale: Vents protect trap seals by equalizing pressure.
5. A trap seal primarily prevents what?
A. Water leakage
B. Pipe corrosion
C. Sewer gas entry
D. Backflow
Italicized rationale: The water in the trap blocks sewer gases.
6. Minimum trap seal depth is generally:
A. 10 mm
B. 25 mm
C. 50 mm
D. 100 mm
Italicized rationale: Plumbing codes typically require a minimum
50 mm trap seal.
7. Which fitting creates the least resistance to flow?
A. Tee
B. 90° elbow
C. 45° elbow
, D. Sanitary tee
Italicized rationale: A 45° elbow provides smoother directional
change.
8. Which slope is commonly required for horizontal drainage piping?
A. 1/16 inch per foot
B. 1/4 inch per foot
C. 1 inch per foot
D. Level
Italicized rationale: Proper slope ensures self-cleaning flow.
9. What does DWV stand for?
A. Drain Water Valve
B. Drain, Waste, and Vent
C. Domestic Water Volume
D. Distribution Water Vent
Italicized rationale: DWV systems remove waste and vent gases.
10. Which fixture requires a trap?
A. Water heater
B. Hose bib
C. Floor drain
D. Vent stack
Italicized rationale: Drains must have traps to prevent sewer
gases.
11. Backflow prevention protects against:
A. High pressure
B. Leakage
C. Contamination of potable water
D. Pipe freezing
