ALBERTA GASFITTER CLASS B EXAM – QUESTIONS AND ANSWERS | VERIFIED AND WELL DETAILED
ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains:
1. Gas Code Regulations and Standards (CSA B149.1)
2. Venting and Exhaust Systems
3. Gas Piping and Fittings (Sizing and Installation)
4. Appliance Installation and Controls
5. Combustion Theory and Efficiency
6. Electrical Fundamentals for Gas Systems
7. Safety Protocols and Hazard Recognition
8. Pressure Testing and Leak Detection
9. Commissioning and Servicing Procedures
10. Professional Ethics and Communication
Introduction
This comprehensive examination is designed to rigorously assess the knowledge and practical skills required for
certification as an Alberta Gasfitter Class B. The exam evaluates a candidate's understanding of foundational
gas theory, proficiency in applying the CSA B149.1 Natural Gas and Propane Installation Code, and competence
in the safe installation, inspection, and servicing of gas appliances and systems. The assessment comprises
multiple-choice questions and scenario-based problems that challenge the candidate's ability to make sound,
real-world decisions. Success in this exam demonstrates a professional's commitment to safety, adherence to
legal standards, and technical capability to operate effectively and ethically within the gasfitting trade.
SECTION ONE: QUESTIONS 1 – 100
,1. According to the CSA B149.1 Code, what is the minimum vertical clearance required from a natural gas
vent terminal to a building's forced air inlet?
A. 1 meter
B. 3 meters
C. 5 meters
D. 10 meters
🟢 B. 3 meters
🔴 Explanation: CSA B149.1 Clause 8.14.8 specifies that the minimum vertical clearance between a natural
gas vent outlet and a forced-air inlet into the building is 3 meters (10 feet) to prevent the ingress of flue
gases into the building's ventilation system, which poses a significant health and safety risk.
2. A gasfitter is installing a flexible appliance connector. What is the maximum allowable length for this
connector according to the standard?
A. 1.5 meters
B. 2 meters
C. 3 meters
D. 4 meters
🟢 A. 1.5 meters
🔴 Explanation: CSA B149.1 limits the length of an unshielded flexible appliance connector to a maximum of
1.5 meters (5 feet). This restriction minimizes the risk of mechanical damage, kinking, and excessive strain on
the connector, which could lead to leaks or failure.
3. Which of the following materials is NOT permitted for use in a natural gas piping system above ground?
A. Schedule 40 black steel pipe
B. Copper tubing (Type L)
,C. PVC pipe (Schedule 40)
D. Wrought iron pipe
🟢 C. PVC pipe (Schedule 40)
🔴 Explanation: PVC pipe is not approved for use in natural gas piping systems in Canada. The code requires
metallic or approved non-metallic materials that are resistant to the effects of the gas and environmental
conditions. PVC is brittle and cannot withstand the pressures and stresses of a gas system.
4. During a combustion test on a natural gas furnace, you record an O2 reading of 8% in the flue gas. This
indicates:
A. Excess air is too high
B. Fuel gas pressure is too high
C. The heat exchanger is cracked
D. The flue is blocked
🟢 A. Excess air is too high
🔴 Explanation: Normal O2 readings in flue gas for a properly tuned furnace range from 3-6%. An 8%
reading indicates high excess air, which dilutes the combustion gases, reducing efficiency and causing the
appliance to run cooler. This could be due to a draft issue or an improperly adjusted air shutter.
5. What is the minimum nominal wall thickness for a Schedule 40 steel pipe used for gas service?
A. 0.133 inches
B. 0.154 inches
C. 0.125 inches
D. 0.179 inches
🟢 B. 0.154 inches
, 🔴 Explanation: The standard nominal wall thickness for a Schedule 40 steel pipe varies by size, but for the
purpose of this question, the code references 0.154 inches for a common size like 2-inch pipe. It is the
correct minimum for pressure integrity in gas applications.
6. A propane tank is located 1.5 meters from a window. Is this compliant?
A. Yes, because it is more than 1 meter away
B. No, because the minimum distance is 3 meters
C. No, because the minimum distance is 5 meters
D. Yes, if the window is always closed
🟢 C. No, because the minimum distance is 5 meters
🔴 Explanation: CSA B149.1 requires a minimum separation distance of 5 meters (16.4 feet) between a
propane container (over 1000 liters) and a building opening or window. This safety distance prevents ignition
of leaking gas that might enter the building.
7. What is the primary purpose of a drip leg (sediment trap) in a gas piping system?
A. To collect moisture and debris
B. To provide an emergency shut-off point
C. To regulate gas pressure
D. To measure gas flow rate
🟢 A. To collect moisture and debris
🔴 Explanation: A drip leg or sediment trap is designed to collect condensate, moisture, and particulate
matter from the gas stream. This prevents these contaminants from entering the appliance gas valve, which
could damage the valve or cause erratic operation.
ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM UPDATE
Core Domains:
1. Gas Code Regulations and Standards (CSA B149.1)
2. Venting and Exhaust Systems
3. Gas Piping and Fittings (Sizing and Installation)
4. Appliance Installation and Controls
5. Combustion Theory and Efficiency
6. Electrical Fundamentals for Gas Systems
7. Safety Protocols and Hazard Recognition
8. Pressure Testing and Leak Detection
9. Commissioning and Servicing Procedures
10. Professional Ethics and Communication
Introduction
This comprehensive examination is designed to rigorously assess the knowledge and practical skills required for
certification as an Alberta Gasfitter Class B. The exam evaluates a candidate's understanding of foundational
gas theory, proficiency in applying the CSA B149.1 Natural Gas and Propane Installation Code, and competence
in the safe installation, inspection, and servicing of gas appliances and systems. The assessment comprises
multiple-choice questions and scenario-based problems that challenge the candidate's ability to make sound,
real-world decisions. Success in this exam demonstrates a professional's commitment to safety, adherence to
legal standards, and technical capability to operate effectively and ethically within the gasfitting trade.
SECTION ONE: QUESTIONS 1 – 100
,1. According to the CSA B149.1 Code, what is the minimum vertical clearance required from a natural gas
vent terminal to a building's forced air inlet?
A. 1 meter
B. 3 meters
C. 5 meters
D. 10 meters
🟢 B. 3 meters
🔴 Explanation: CSA B149.1 Clause 8.14.8 specifies that the minimum vertical clearance between a natural
gas vent outlet and a forced-air inlet into the building is 3 meters (10 feet) to prevent the ingress of flue
gases into the building's ventilation system, which poses a significant health and safety risk.
2. A gasfitter is installing a flexible appliance connector. What is the maximum allowable length for this
connector according to the standard?
A. 1.5 meters
B. 2 meters
C. 3 meters
D. 4 meters
🟢 A. 1.5 meters
🔴 Explanation: CSA B149.1 limits the length of an unshielded flexible appliance connector to a maximum of
1.5 meters (5 feet). This restriction minimizes the risk of mechanical damage, kinking, and excessive strain on
the connector, which could lead to leaks or failure.
3. Which of the following materials is NOT permitted for use in a natural gas piping system above ground?
A. Schedule 40 black steel pipe
B. Copper tubing (Type L)
,C. PVC pipe (Schedule 40)
D. Wrought iron pipe
🟢 C. PVC pipe (Schedule 40)
🔴 Explanation: PVC pipe is not approved for use in natural gas piping systems in Canada. The code requires
metallic or approved non-metallic materials that are resistant to the effects of the gas and environmental
conditions. PVC is brittle and cannot withstand the pressures and stresses of a gas system.
4. During a combustion test on a natural gas furnace, you record an O2 reading of 8% in the flue gas. This
indicates:
A. Excess air is too high
B. Fuel gas pressure is too high
C. The heat exchanger is cracked
D. The flue is blocked
🟢 A. Excess air is too high
🔴 Explanation: Normal O2 readings in flue gas for a properly tuned furnace range from 3-6%. An 8%
reading indicates high excess air, which dilutes the combustion gases, reducing efficiency and causing the
appliance to run cooler. This could be due to a draft issue or an improperly adjusted air shutter.
5. What is the minimum nominal wall thickness for a Schedule 40 steel pipe used for gas service?
A. 0.133 inches
B. 0.154 inches
C. 0.125 inches
D. 0.179 inches
🟢 B. 0.154 inches
, 🔴 Explanation: The standard nominal wall thickness for a Schedule 40 steel pipe varies by size, but for the
purpose of this question, the code references 0.154 inches for a common size like 2-inch pipe. It is the
correct minimum for pressure integrity in gas applications.
6. A propane tank is located 1.5 meters from a window. Is this compliant?
A. Yes, because it is more than 1 meter away
B. No, because the minimum distance is 3 meters
C. No, because the minimum distance is 5 meters
D. Yes, if the window is always closed
🟢 C. No, because the minimum distance is 5 meters
🔴 Explanation: CSA B149.1 requires a minimum separation distance of 5 meters (16.4 feet) between a
propane container (over 1000 liters) and a building opening or window. This safety distance prevents ignition
of leaking gas that might enter the building.
7. What is the primary purpose of a drip leg (sediment trap) in a gas piping system?
A. To collect moisture and debris
B. To provide an emergency shut-off point
C. To regulate gas pressure
D. To measure gas flow rate
🟢 A. To collect moisture and debris
🔴 Explanation: A drip leg or sediment trap is designed to collect condensate, moisture, and particulate
matter from the gas stream. This prevents these contaminants from entering the appliance gas valve, which
could damage the valve or cause erratic operation.
