100+ Free TSSA Gas Technician 1 (G1) Practice Questions

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2026 Statistics

Key Facts: TSSA Gas Technician 1 (G1) Exam

75%

Fuels Passing Score

TSSA Examination Prep Guide

3.5 h

Maximum Exam Time

TSSA Examination Prep Guide

26–31

G1 CSA Modules

TSSA Gas/Oil Burner Policies

>400k BTU/h

G1 High-Input Scope Focus

TSSA G.1 / G.2 scope practice

$89

Other Examination Fee (CAD, May 1, 2026)

TSSA Natural Gas & Hydrogen Fee Schedule

500 h

Min. Supervised Hours >400k BTU/h

TSSA G1 admission / O. Reg. 215/01 practice

TSSA G.1 is Ontario’s advanced gas technician certificate for commercial/industrial gas work including equipment over 400,000 BTU/h (no upper input limit). Fuels written exams are multiple choice with a 75% pass mark and up to 3.5 hours; exact G1 item count is not published (Fuels range 50–165). TSSA Other Examination fee is CAD $89 effective May 1, 2026 (Natural Gas & Hydrogen Fee Schedule)—confirm the current schedule. This free bank offers 100 practice MCQs mapped to G1 modules 26–31 and CSA B149.1/B149.2/B149.3 concepts.

Sample TSSA Gas Technician 1 (G1) Practice Questions

Try these sample questions to test your TSSA Gas Technician 1 (G1) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which certificate authorizes unsupervised work on natural gas and propane appliances and equipment in Ontario with no upper input limit, including systems over 400,000 BTU/h?

A.Gas Technician 1 (G.1)

B.Liquid Propane Fitter (LP) only

C.Gas Technician 3 (G.3)

D.Gas Technician 2 (G.2)

Explanation: G.1 is Ontario’s highest gas-technician certificate. It authorizes unsupervised work with no upper input limit, including commercial/industrial systems over 400,000 BTU/h that exceed G.2 scope.

2Per TSSA Gas Technician policies aligned with O. Reg. 215/01 practice, how much supervised high-input experience is typically required before G.1 eligibility?

A.At least 100 hours on any gas appliance under a G.2 certificate holder

B.At least 500 hours on systems with input greater than 400,000 BTU/h under direct G.1 supervision

C.At least 2,000 hours only on residential furnaces under 100,000 BTU/h

D.No high-input hours are required if the candidate holds G.2 for six months

Explanation: G.1 applicants must hold valid G.2 and meet experience rules that include at least 500 hours on systems greater than 400,000 BTU/h under direct supervision of a G.1 certificate holder, in addition to overall G.2 experience thresholds.

3Which CSA code is especially emphasized in G.1 study for field approval of fuel-related components on appliances and equipment?

A.CSA B51 Boiler, Pressure Vessel and Pressure Piping Code

B.CSA B149.2 Propane Storage and Handling Code only

C.CSA B149.3 Code for the field approval of fuel-burning appliances and equipment

D.CSA B139 Installation Code for Oil-Burning Equipment

Explanation: CSA B149.3 addresses field approval of fuel-burning appliances and equipment / fuel-related components. G.1 work on large commercial and industrial systems frequently involves B149.3 concepts alongside B149.1 installation requirements.

4What is the minimum passing grade for TSSA Fuels Safety written certification examinations, including Gas Technician G.1?

A.80%

B.65%

C.70%

D.75%

Explanation: Per the TSSA Certification Examination Preparation Guide, the Fuels program area passing grade is 75%. Other program areas use different pass marks.

5Which accredited G.1 training modules does TSSA list beyond the G.2 curriculum?

A.Modules 26, 27, 28, 29, 30, and 31

B.Modules 1 through 9 only

C.Module 25 Liquid Propane only

D.Modules 10 through 24 only

Explanation: TSSA Gas Technician policies list G.1 as G.3 plus G.2 plus modules 26–31 (flame safeguards; commercial/industrial appliances; gas-fired AC/refrigeration; G1 electricity; G1 controls; valve trains and burners).

6TSSA Fuels written exams are typically which format regarding reference materials?

A.Closed-book with no codes permitted

B.Open-book with permitted unmarked Act, regulations, Code Adoption Documents, and CSA B149 codes

C.Open internet with any online forum allowed

D.Oral only with no written references

Explanation: TSSA Fuels certification exams are multiple-choice and open-book with permitted unmarked codes and regulations (Act, Fuels regulations/CAD, B149.1, and related permitted materials).

7After three unsuccessful TSSA Fuels certification examination attempts, what does O. Reg. 215/01 practice require before another attempt?

A.Only a letter of recommendation from any G.3 holder

B.Immediate re-write the next day with no further training

C.Accredited retraining before another attempt

D.Automatic certificate issuance by challenge

Explanation: After three failures, O. Reg. 215/01 requires accredited retraining before another attempt. Fuels candidates who do not pass may otherwise re-write after the standard waiting period.

8What overall G.2 work experience threshold is commonly required (in addition to high-input hours) for G.1 admission under TSSA policy / O. Reg. 215/01 practice?

A.At least 30 days of G.2-scope work

B.At least 10 years of G.3-only supervised work

C.No experience if the candidate completes any online quiz

D.At least 2 years or 4,000 hours of G.2-scope work

Explanation: Accredited G.1 pathways require a valid G.2 certificate plus at least 2 years or 4,000 hours of G.2 work experience, including the separate ≥500-hour high-input supervised requirement (or an approved challenge pathway).

9Which primary installation code does a G.1 technician apply for natural gas and propane appliance and piping installations in Ontario (with CAD amendments)?

A.CSA B149.1 Natural Gas and Propane Installation Code

B.National Building Code alone without fuels codes

C.CSA C22.1 Canadian Electrical Code as the sole gas piping code

D.ASME B31.1 Power Piping as the only Ontario fuels installation code

Explanation: CSA B149.1 is the primary installation code for natural gas and propane appliances and piping, adopted in Ontario with Code Adoption Document amendments. G.1 candidates also study B149.2 and B149.3 concepts for large equipment.

10Relative to G.2 scope, which statement best describes G.1 authority on input rating?

A.G.1 is limited to residential appliances under 100,000 BTU/h only

B.G.1 has no upper input limit and includes equipment over 400,000 BTU/h

C.G.1 may only work on equipment if a G.3 certificate holder is present

D.G.1 is limited to 400,000 BTU/h maximum, same as G.2

Explanation: G.1 is the advanced certificate with no upper input limit. It specifically covers the commercial/industrial territory above the G.2 400,000 BTU/h ceiling.

About the TSSA Gas Technician 1 (G1) Exam

The Ontario TSSA Gas Technician 1 (G.1) certificate is the highest gas-technician level and authorizes unsupervised work on natural gas and propane appliances and equipment with no upper input limit, including systems over 400,000 BTU/h typical of commercial and industrial sites. Candidates hold G.2, complete accredited modules 26–31, and meet experience rules (including ≥500 hours on >400,000 BTU/h systems under G.1 supervision). The written exam is multiple choice, Fuels pass mark 75%, with up to 3.5 hours allowed. Study emphasizes flame safeguards, valve trains and burners, commercial/industrial appliances, G1 electricity/controls, and gas-fired AC/refrigeration alongside CSA B149 codes.

Assessment

Multiple-choice written Fuels exam covering regulatory sector knowledge plus G.1 technical content (CSA Gas Trade modules 26–31 and CSA B149.1/B149.2/B149.3 concepts). Open-book with permitted unmarked Act, regulations, Code Adoption Documents, and B149 codes. Practical evaluation is completed through the accredited training program (or assessment pathway).

Time Limit

Up to 3.5 hours (210 minutes)

Passing Score

75%

Exam Fee

CAD $89 Other Examination / CAD $255.50 Challenge Examination (Natural Gas & Hydrogen Fee Schedule, effective May 1, 2026). Biennial certificate CAD $136. Confirm current schedule; provider admin/invigilation fees may apply. (Technical Standards and Safety Authority (TSSA))

TSSA Gas Technician 1 (G1) Exam Content Outline

10%

Codes, Regulations & G1 Scope

TSS Act, O. Reg. 215/01, B149.1/B149.2/B149.3, CAD, G.1 scope and experience rules

18%

Flame Safeguard Controls

Module 26 flame sensing, programmers, purge, TFI, and lockout

16%

Commercial & Industrial Appliances

Module 27 high-input boilers, process heaters, ovens, and commissioning

10%

Gas-Fired AC & Refrigeration

Module 28 gas-fired chillers/refrigeration interfaces and safety

12%

G1 Electricity

Module 29 three-phase power, motors, transformers, and interlocks

14%

G1 Controls

Module 30 modulating/sequencing controls and commercial interlocks

20%

Valve Trains & Burners

Module 31 valve trains, SSOVs, DBB, pilots, and burner light-off

How to Pass the TSSA Gas Technician 1 (G1) Exam

What You Need to Know

Passing score: 75%
Assessment: Multiple-choice written Fuels exam covering regulatory sector knowledge plus G.1 technical content (CSA Gas Trade modules 26–31 and CSA B149.1/B149.2/B149.3 concepts). Open-book with permitted unmarked Act, regulations, Code Adoption Documents, and B149 codes. Practical evaluation is completed through the accredited training program (or assessment pathway).
Time limit: Up to 3.5 hours (210 minutes)
Exam fee: CAD $89 Other Examination / CAD $255.50 Challenge Examination (Natural Gas & Hydrogen Fee Schedule, effective May 1, 2026). Biennial certificate CAD $136. Confirm current schedule; provider admin/invigilation fees may apply.

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

TSSA Gas Technician 1 (G1) Study Tips from Top Performers

1Tab CSA B149.1 for high-input clearances/venting/combustion air and study B149.3 valve-train and field-approval concepts used on large commercial/industrial equipment

2Drill Module 26 sequences: pre-purge → trial for ignition → main flame proving → run → post-purge / lockout on flame failure

3Know double block and bleed, SSOV proving, low/high gas pressure switches, and combustion-air proving on Module 31 valve trains

4Contrast G2 residential controls with G1 UV/IR scanners, flame rods, and programming flame-safeguard controls on large burners

5Review G1 experience thresholds (4,000 hours / 500 hours >400k BTU/h under G1 supervision) so regulatory questions do not surprise you

6Complete all 100 practice questions, then rework every miss with the AI tutor under timed conditions

Frequently Asked Questions

What score do I need to pass the TSSA G1 exam?

Fuels Safety examinations require 75% to pass, per the TSSA Certification Examination Preparation Guide. Unsuccessful candidates receive a mastery report and may re-write after 30 days for Fuels exams.

How many questions are on the TSSA G1 written exam?

TSSA does not publish a fixed G1 question count. Fuels written exams typically range from 50 to 165 multiple-choice items depending on certificate type, with up to 3.5 hours allowed.

What is the G1 certificate scope in Ontario?

Gas Technician 1 (G.1) is the highest gas-technician certificate. It authorizes unsupervised work on natural gas and propane appliances and equipment with no upper input limit, including commercial/industrial systems over 400,000 BTU/h that exceed G.2 scope.

What do I study for the G1 exam?

Accredited G.1 training covers CSA Gas Trade modules 26 through 31 (flame safeguards; commercial/industrial appliances; gas-fired AC/refrigeration; G1 electricity; G1 controls; valve trains and burners) plus CSA B149.1/B149.2 and field-approval concepts in CSA B149.3, the Technical Standards and Safety Act, and applicable Fuels regulations and Code Adoption Documents.

What experience do I need before G1?

Applicants must hold a valid G.2 certificate and meet O. Reg. 215/01 / TSSA policy experience rules: typically at least 2 years or 4,000 hours of G.2 work, including at least 500 hours on systems with input greater than 400,000 BTU/h under direct supervision of a G.1 certificate holder, plus accredited G.1 training (or an approved challenge pathway).

How much does the TSSA G1 exam cost?

Per the TSSA Natural Gas & Hydrogen Fee Schedule effective May 1, 2026, Other Examination is CAD $89 and Challenge Examination is CAD $255.50 (biennial certificate initial/renewal CAD $136). Confirm the current schedule, and expect possible training-provider administration or invigilation fees if the exam is hosted at a college.