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Ontario Gas Technician 1 (G1) Certification Exam
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
Ontario Gas Technician 1 (G1) Certification Exam
This comprehensive practice examination covers all key areas of the G1 curriculum, including codes and
regulations (CSA B149.1), electrical theory, controls, valve trains, flame safeguard systems,
commercial/industrial appliances, and gas-fired air conditioning. Each question is designed to reflect the
format and difficulty of the actual TSSA G1 Certification Exam .
Section 1: CSA B149.1 – Natural Gas and Propane Installation Code
1. What is the primary code governing the installation of natural gas and propane systems in Ontario?
A) CSA B149.3
B) CSA B149.1
C) CSA B149.2
D) CSA B149.5
Answer: B
Rationale: CSA B149.1 is the Natural Gas and Propane Installation Code, which is the primary regulatory
document for gas installations in Ontario .
2. According to CSA B149.1, what is the minimum clearance required from a gas appliance to
combustible construction unless otherwise specified by the manufacturer?
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A) 3 inches (76 mm)
B) 6 inches (152 mm)
C) 12 inches (305 mm)
D) 18 inches (457 mm)
Answer: B
Rationale: The code requires a minimum 6-inch clearance to combustibles unless the appliance
manufacturer specifies different distances.
3. What does the CSA B149.3 code specifically cover?
A) Installation of gas piping systems
B) Field approval of fuel-related components on appliances and equipment
C) Propane storage and handling
D) Natural gas vehicle fueling stations
Answer: B
Rationale: CSA B149.3 is the Code for the Field Approval of Fuel-Related Components on Appliances and
Equipment .
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4. Under the TSSA regulations, what is the maximum time allowed for completing a gas leak repair after
discovery?
A) 24 hours
B) 48 hours
C) 72 hours
D) Immediate repair required
Answer: D
Rationale: The Technical Standards and Safety Act requires immediate repair of any gas leak that poses
an immediate hazard.
5. When installing a gas appliance in a residential garage, the appliance must be located at least how
many inches above the floor?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Answer: B
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Rationale: Gas appliances in garages must be installed at least 18 inches above the floor to avoid ignition
of gasoline vapors.
6. What is the maximum allowable pressure drop through a gas piping system from the meter to the
appliance?
A) 0.5 inches w.c.
B) 1.0 inches w.c.
C) 1.5 inches w.c.
D) 2.0 inches w.c.
Answer: B
Rationale: CSA B149.1 limits pressure drop to 1 inch w.c. for natural gas systems to ensure proper
appliance operation.
7. Which type of pipe joint is prohibited for natural gas piping inside a building?
A) Threaded connections
B) Flanged connections
C) Lead and oakum joints
D) Brazed connections
Ontario Gas Technician 1 (G1) Certification Exam
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
Ontario Gas Technician 1 (G1) Certification Exam
This comprehensive practice examination covers all key areas of the G1 curriculum, including codes and
regulations (CSA B149.1), electrical theory, controls, valve trains, flame safeguard systems,
commercial/industrial appliances, and gas-fired air conditioning. Each question is designed to reflect the
format and difficulty of the actual TSSA G1 Certification Exam .
Section 1: CSA B149.1 – Natural Gas and Propane Installation Code
1. What is the primary code governing the installation of natural gas and propane systems in Ontario?
A) CSA B149.3
B) CSA B149.1
C) CSA B149.2
D) CSA B149.5
Answer: B
Rationale: CSA B149.1 is the Natural Gas and Propane Installation Code, which is the primary regulatory
document for gas installations in Ontario .
2. According to CSA B149.1, what is the minimum clearance required from a gas appliance to
combustible construction unless otherwise specified by the manufacturer?
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A) 3 inches (76 mm)
B) 6 inches (152 mm)
C) 12 inches (305 mm)
D) 18 inches (457 mm)
Answer: B
Rationale: The code requires a minimum 6-inch clearance to combustibles unless the appliance
manufacturer specifies different distances.
3. What does the CSA B149.3 code specifically cover?
A) Installation of gas piping systems
B) Field approval of fuel-related components on appliances and equipment
C) Propane storage and handling
D) Natural gas vehicle fueling stations
Answer: B
Rationale: CSA B149.3 is the Code for the Field Approval of Fuel-Related Components on Appliances and
Equipment .
, Page 3 of 122
4. Under the TSSA regulations, what is the maximum time allowed for completing a gas leak repair after
discovery?
A) 24 hours
B) 48 hours
C) 72 hours
D) Immediate repair required
Answer: D
Rationale: The Technical Standards and Safety Act requires immediate repair of any gas leak that poses
an immediate hazard.
5. When installing a gas appliance in a residential garage, the appliance must be located at least how
many inches above the floor?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Answer: B
, Page 4 of 122
Rationale: Gas appliances in garages must be installed at least 18 inches above the floor to avoid ignition
of gasoline vapors.
6. What is the maximum allowable pressure drop through a gas piping system from the meter to the
appliance?
A) 0.5 inches w.c.
B) 1.0 inches w.c.
C) 1.5 inches w.c.
D) 2.0 inches w.c.
Answer: B
Rationale: CSA B149.1 limits pressure drop to 1 inch w.c. for natural gas systems to ensure proper
appliance operation.
7. Which type of pipe joint is prohibited for natural gas piping inside a building?
A) Threaded connections
B) Flanged connections
C) Lead and oakum joints
D) Brazed connections
