Ontario Gas Technician 1 (G1) Certification Practice Exam:
Newest Comprehensive Questions, Answers, and TSSA
Regulation & CSA B149 Code Explanations Bundle (Latest
Edition
Section 1: Codes, Regulations, and Licensing
1. What is the minimum passing score required on the TSSA EX 03 Gas
Technician 1 Exam to qualify for a G.1 licence?
A) 65%
B) 75%
C) 80%
D) 85%
Answer: B) 75%
Rationale: The TSSA requires candidates to achieve a score of 75% or higher on
the EX 03 Gas Technician 1 Exam to qualify for the G.1 licence .
2. A G1 licence holder may work on equipment with which BTU input capacity?
A) Up to 400,000 BTU/hr only
B) Any BTU/hr capacity (unrestricted)
C) Up to 1,000,000 BTU/hr only
D) Only appliances under 200,000 BTU/hr
Answer: B) Any BTU/hr capacity (unrestricted)
Rationale: G1 is the highest level of gas technician licensing in Ontario, allowing
technicians to work on natural gas and propane equipment of any BTU/hr capacity
without restriction .
3. Which of the following codes is the primary governing document for gas
installations in Ontario?
A) CSA B149.3
B) CSA B149.1
C) NFPA 54
D) ASME Section IX
,Answer: B) CSA B149.1
Rationale: CSA B149.1, the Natural Gas and Propane Installation Code, is the
primary code governing gas installations in Ontario .
4. Which regulation under the Technical Standards and Safety Act, 2000, governs
the licensing and certification of Gas Technicians in Ontario?
A) O. Reg. 211/01
B) O. Reg. 212/01
C) O. Reg. 213/01
D) O. Reg. 215/01
Answer: D) O. Reg. 215/01
Rationale: Ontario Regulation 215/01 (Fuel Industry Certificates) specifically
mandates the certification, training, and scope of practice requirements for gas
technicians under the TSSA .
5. Under CSA B149.1, what is the minimum clearance required between a
natural-gas furnace and a combustible wall?
A) 1 inch
B) 3 inches
C) 6 inches
D) 12 inches
Answer: B) 3 inches
Rationale: Clause 8.1.3 of CSA B149.1 generally requires a minimum clearance of
3 inches from combustible materials for gas appliances, unless the appliance is
listed for a lesser clearance .
6. Which of the following piping materials is NOT permitted for gas piping
systems under CSA B149.1?
A) Black steel pipe
B) Aluminum pipe
C) Corrugated stainless steel tubing (CSST)
D) Copper tubing (type L or G)
,Answer: B) Aluminum pipe
Rationale: Aluminum is not listed as an approved material for gas piping systems
due to its susceptibility to corrosion and low mechanical strength .
7. Under Ontario Regulation 215/01, what is the primary responsibility of a G1
licensed technician regarding unsafe gas appliances?
A) Repair the appliance without notifying the owner
B) Immediately deactivate and tag the appliance as unsafe
C) Ignore minor defects and monitor the appliance
D) Report the appliance to the TSSA without taking action
Answer: B) Immediately deactivate and tag the appliance as unsafe
Rationale: Ontario Regulation 215/01 mandates that any person who services a
gas appliance and finds a hazardous condition shall immediately render the
appliance safe or deactivate it and tag it as unsafe .
8. Which document specifies the qualifications and prerequisites required to
become a Gas Technician 1 in Ontario?
A) CSA B149.1
B) TSSA Code of Practice
C) O. Reg. 213/07
D) NFPA 54
Answer: B) TSSA Code of Practice
Rationale: The TSSA Code of Practice specifies the qualifications and prerequisites
required to become a Gas Technician 1 in Ontario .
9. Under CSA B149.1, what is the purpose of a sediment trap (dirt leg) installed
at the inlet of each appliance?
A) To increase gas pressure
B) To prevent debris from entering the gas controls
C) To regulate gas flow
D) To serve as a manual shutoff
, Answer: B) To prevent debris from entering the gas controls
Rationale: Sediment traps must be installed at the inlet of each appliance to
prevent debris from entering the gas controls .
10. A G1 technician is called to service a gas appliance. What is the first legal
requirement before starting any work?
A) Remove the appliance from service
B) Notify the TSSA
C) Apply for a building permit
D) Identify the type of gas and the appliance's input rating
Answer: D) Identify the type of gas and the appliance's input rating
Rationale: Before any work, the technician must identify the type of gas and the
appliance’s input rating to ensure proper procedures are followed .
11. 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) Field approval of fuel-related components on appliances and
equipment
Rationale: CSA B149.3 is the Code for the Field Approval of Fuel-Related
Components on Appliances and Equipment .
12. Under CSA B149.1, what is the maximum allowable pressure drop on a
natural gas piping system that operates with a supply pressure between 7" w.c.
and 14" w.c.?
A) 0.5" w.c.
B) 1.0" w.c.
C) 1.5" w.c.
D) 2.0" w.c.
Answer: B) 1.0" w.c.
Rationale: A common requirement for systems operating in this pressure range is
Newest Comprehensive Questions, Answers, and TSSA
Regulation & CSA B149 Code Explanations Bundle (Latest
Edition
Section 1: Codes, Regulations, and Licensing
1. What is the minimum passing score required on the TSSA EX 03 Gas
Technician 1 Exam to qualify for a G.1 licence?
A) 65%
B) 75%
C) 80%
D) 85%
Answer: B) 75%
Rationale: The TSSA requires candidates to achieve a score of 75% or higher on
the EX 03 Gas Technician 1 Exam to qualify for the G.1 licence .
2. A G1 licence holder may work on equipment with which BTU input capacity?
A) Up to 400,000 BTU/hr only
B) Any BTU/hr capacity (unrestricted)
C) Up to 1,000,000 BTU/hr only
D) Only appliances under 200,000 BTU/hr
Answer: B) Any BTU/hr capacity (unrestricted)
Rationale: G1 is the highest level of gas technician licensing in Ontario, allowing
technicians to work on natural gas and propane equipment of any BTU/hr capacity
without restriction .
3. Which of the following codes is the primary governing document for gas
installations in Ontario?
A) CSA B149.3
B) CSA B149.1
C) NFPA 54
D) ASME Section IX
,Answer: B) CSA B149.1
Rationale: CSA B149.1, the Natural Gas and Propane Installation Code, is the
primary code governing gas installations in Ontario .
4. Which regulation under the Technical Standards and Safety Act, 2000, governs
the licensing and certification of Gas Technicians in Ontario?
A) O. Reg. 211/01
B) O. Reg. 212/01
C) O. Reg. 213/01
D) O. Reg. 215/01
Answer: D) O. Reg. 215/01
Rationale: Ontario Regulation 215/01 (Fuel Industry Certificates) specifically
mandates the certification, training, and scope of practice requirements for gas
technicians under the TSSA .
5. Under CSA B149.1, what is the minimum clearance required between a
natural-gas furnace and a combustible wall?
A) 1 inch
B) 3 inches
C) 6 inches
D) 12 inches
Answer: B) 3 inches
Rationale: Clause 8.1.3 of CSA B149.1 generally requires a minimum clearance of
3 inches from combustible materials for gas appliances, unless the appliance is
listed for a lesser clearance .
6. Which of the following piping materials is NOT permitted for gas piping
systems under CSA B149.1?
A) Black steel pipe
B) Aluminum pipe
C) Corrugated stainless steel tubing (CSST)
D) Copper tubing (type L or G)
,Answer: B) Aluminum pipe
Rationale: Aluminum is not listed as an approved material for gas piping systems
due to its susceptibility to corrosion and low mechanical strength .
7. Under Ontario Regulation 215/01, what is the primary responsibility of a G1
licensed technician regarding unsafe gas appliances?
A) Repair the appliance without notifying the owner
B) Immediately deactivate and tag the appliance as unsafe
C) Ignore minor defects and monitor the appliance
D) Report the appliance to the TSSA without taking action
Answer: B) Immediately deactivate and tag the appliance as unsafe
Rationale: Ontario Regulation 215/01 mandates that any person who services a
gas appliance and finds a hazardous condition shall immediately render the
appliance safe or deactivate it and tag it as unsafe .
8. Which document specifies the qualifications and prerequisites required to
become a Gas Technician 1 in Ontario?
A) CSA B149.1
B) TSSA Code of Practice
C) O. Reg. 213/07
D) NFPA 54
Answer: B) TSSA Code of Practice
Rationale: The TSSA Code of Practice specifies the qualifications and prerequisites
required to become a Gas Technician 1 in Ontario .
9. Under CSA B149.1, what is the purpose of a sediment trap (dirt leg) installed
at the inlet of each appliance?
A) To increase gas pressure
B) To prevent debris from entering the gas controls
C) To regulate gas flow
D) To serve as a manual shutoff
, Answer: B) To prevent debris from entering the gas controls
Rationale: Sediment traps must be installed at the inlet of each appliance to
prevent debris from entering the gas controls .
10. A G1 technician is called to service a gas appliance. What is the first legal
requirement before starting any work?
A) Remove the appliance from service
B) Notify the TSSA
C) Apply for a building permit
D) Identify the type of gas and the appliance's input rating
Answer: D) Identify the type of gas and the appliance's input rating
Rationale: Before any work, the technician must identify the type of gas and the
appliance’s input rating to ensure proper procedures are followed .
11. 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) Field approval of fuel-related components on appliances and
equipment
Rationale: CSA B149.3 is the Code for the Field Approval of Fuel-Related
Components on Appliances and Equipment .
12. Under CSA B149.1, what is the maximum allowable pressure drop on a
natural gas piping system that operates with a supply pressure between 7" w.c.
and 14" w.c.?
A) 0.5" w.c.
B) 1.0" w.c.
C) 1.5" w.c.
D) 2.0" w.c.
Answer: B) 1.0" w.c.
Rationale: A common requirement for systems operating in this pressure range is
