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ALBERTA PLUMBER APPRENTICESHIP
Certification Exam (First Period) Practice
(Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Top Rated
1. A backflow preventer protects against…
A. Clogging
B. Contamination of potable water
C. Pipe corrosion
D. Air circulation in vents
Rationale>> Backflow prevention ensures contaminants cannot enter the
clean water system.
2. Hard water contains high levels of:
A. Sodium
B. Iron
C. Calcium and magnesium
D. Carbon dioxide
Rationale>> Hardness is caused by calcium and magnesium mineral content.
3. The term “fixture unit” measures:
A. Weight of a fixture
B. Probable discharge load of a fixture
C. Size of drain
D. Pressure rating
Rationale>> Fixture units estimate probable demand on a drainage or water
system.
4. What is the minimum size for a building drain?
A. 2"
B. 3"
C. 4"
, D. 6"
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Rationale>> Building drains normally require at least 4 inches for
capacity and code compliance.
5. Galvanic corrosion occurs when:
A. Water is too pure
B. Dissimilar metals contact in presence of an electrolyte
C. Pressure is too high
D. Venting is inadequate
Rationale>> Different metals create an electrical reaction causing
accelerated corrosion.
6. Soldering copper requires heating to approximately:
A. 150°C
B. 230°C
C. 600°C
D. 900°C
Rationale>> Soft solder melts between 180–230°C depending on alloy.
7. Which fitting changes pipe direction by 90°?
A. Wye
B. Coupling
C. Elbow
D. Union
Rationale>> Elbows are designed for directional changes, including 90°.
8. Pressure in a closed water system increases when:
A. A vent is added
B. Flow stops
C. Water is heated
D. A relief valve is removed
Rationale>> Thermal expansion increases pressure unless properly relieved.
9. A water hammer arrester is used to:
A. Increase water pressure
B. Remove air from pipes
, C. Absorb sudden pressure
@#$%^&(*)_(*$#@#$*&)(_($#$%*& spikes
D. Prevent backflow
Rationale>> Arresters reduce the shock caused by quick valve closures.
10. A vent stack is used to:
A. Drain stormwater
B. Provide air circulation in the drainage system
C. Boost water pressure
D. Store wastewater
Rationale>> Vent stacks ensure proper air movement throughout the system.
11. The term “ID” in piping stands for:
A. Inner depth
B. Inside diameter
C. Interior density
D. Internal deflection
Rationale>> ID denotes the pipe's inside diameter for sizing purposes.
12. What is the maximum trap arm length determined by?
A. Fixture units
B. Pipe diameter and slope
C. Vent size
D. Water pressure
Rationale>> Trap arm limits depend on diameter and slope to maintain a
functional seal.
13. The main purpose of a vent header is:
A. To drain rainwater
B. Connect all vents to a single vent exit
C. Remove solids
D. Increase velocity
Rationale>> Vent headers consolidate vent piping into a common outlet.
14. Sump pumps are used when:
A. Water pressure is too low
B. Drainage is below building drain level
ALBERTA PLUMBER APPRENTICESHIP
Certification Exam (First Period) Practice
(Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Top Rated
1. A backflow preventer protects against…
A. Clogging
B. Contamination of potable water
C. Pipe corrosion
D. Air circulation in vents
Rationale>> Backflow prevention ensures contaminants cannot enter the
clean water system.
2. Hard water contains high levels of:
A. Sodium
B. Iron
C. Calcium and magnesium
D. Carbon dioxide
Rationale>> Hardness is caused by calcium and magnesium mineral content.
3. The term “fixture unit” measures:
A. Weight of a fixture
B. Probable discharge load of a fixture
C. Size of drain
D. Pressure rating
Rationale>> Fixture units estimate probable demand on a drainage or water
system.
4. What is the minimum size for a building drain?
A. 2"
B. 3"
C. 4"
, D. 6"
@#$%^&(*)_(*$#@#$*&)(_($#$%*&
Rationale>> Building drains normally require at least 4 inches for
capacity and code compliance.
5. Galvanic corrosion occurs when:
A. Water is too pure
B. Dissimilar metals contact in presence of an electrolyte
C. Pressure is too high
D. Venting is inadequate
Rationale>> Different metals create an electrical reaction causing
accelerated corrosion.
6. Soldering copper requires heating to approximately:
A. 150°C
B. 230°C
C. 600°C
D. 900°C
Rationale>> Soft solder melts between 180–230°C depending on alloy.
7. Which fitting changes pipe direction by 90°?
A. Wye
B. Coupling
C. Elbow
D. Union
Rationale>> Elbows are designed for directional changes, including 90°.
8. Pressure in a closed water system increases when:
A. A vent is added
B. Flow stops
C. Water is heated
D. A relief valve is removed
Rationale>> Thermal expansion increases pressure unless properly relieved.
9. A water hammer arrester is used to:
A. Increase water pressure
B. Remove air from pipes
, C. Absorb sudden pressure
@#$%^&(*)_(*$#@#$*&)(_($#$%*& spikes
D. Prevent backflow
Rationale>> Arresters reduce the shock caused by quick valve closures.
10. A vent stack is used to:
A. Drain stormwater
B. Provide air circulation in the drainage system
C. Boost water pressure
D. Store wastewater
Rationale>> Vent stacks ensure proper air movement throughout the system.
11. The term “ID” in piping stands for:
A. Inner depth
B. Inside diameter
C. Interior density
D. Internal deflection
Rationale>> ID denotes the pipe's inside diameter for sizing purposes.
12. What is the maximum trap arm length determined by?
A. Fixture units
B. Pipe diameter and slope
C. Vent size
D. Water pressure
Rationale>> Trap arm limits depend on diameter and slope to maintain a
functional seal.
13. The main purpose of a vent header is:
A. To drain rainwater
B. Connect all vents to a single vent exit
C. Remove solids
D. Increase velocity
Rationale>> Vent headers consolidate vent piping into a common outlet.
14. Sump pumps are used when:
A. Water pressure is too low
B. Drainage is below building drain level
