100+ Free TSSA Gas Technician 2 (G2) Practice Questions

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2026 Statistics

Key Facts: TSSA Gas Technician 2 (G2) Exam

75%

Fuels Passing Score

TSSA Examination Prep Guide

3.5 h

Maximum Exam Time

TSSA Examination Prep Guide

10–24

G2 CSA Modules

TSSA Gas/Oil Burner Policies

400k BTU/h

Typical G2 Max Appliance Input

TSSA G.2 / G.1 scope practice

$89

Other Examination Fee (CAD, May 1, 2026)

TSSA Natural Gas & Hydrogen Fee Schedule

30 days

Fuels Re-Write Wait

TSSA Examination Prep Guide

TSSA G.2 is Ontario’s intermediate gas technician certificate for unsupervised residential and light-commercial gas work (≤400,000 BTU/h) after G.3. Fuels written exams are multiple choice with a 75% pass mark and up to 3.5 hours; exact G2 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 G2 modules 10–24 and CSA B149.1/B149.2.

Sample TSSA Gas Technician 2 (G2) Practice Questions

Try these sample questions to test your TSSA Gas Technician 2 (G2) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which code is the primary installation standard a TSSA Gas Technician 2 applies when installing natural gas and propane appliances and piping in Ontario?

A.National Plumbing Code of Canada

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

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

D.CSA B139 Installation Code for Oil-Burning Equipment

Explanation: CSA B149.1 is adopted for gaseous fuels installation work in Ontario (with Code Adoption Document amendments). G2 candidates are expected to use B149.1 together with the Act, Fuels regulations, and CAD during the open-book written exam.

2Which CSA code governs propane storage and handling, separate from appliance and piping installation?

A.CSA B108

B.CSA B149.2

C.CSA B149.3

D.CSA B149.1

Explanation: CSA B149.2, the Propane Storage and Handling Code, covers storage, handling, and transfer of propane including cylinders and tanks. CSA B149.1 covers installation of appliances and piping for both natural gas and propane.

3What is the minimum passing grade for TSSA Fuels Safety written certification examinations, including Gas Technician exams?

A.65%

B.80%

C.70%

D.75%

Explanation: Per the TSSA Certification Examination Preparation Guide, the Fuels program area passing grade is 75%. Elevating/Amusement/Ski Lift exams use 70%, and Operating Engineers use 65%.

4A candidate for a TSSA Gas Technician 2 (G.2) certificate must first hold which prerequisite certificate?

A.Gas Technician 3 (G.3)

B.Liquid Propane (LP) endorsement

C.Oil Burner Technician 3 (OBT-3)

D.Gas Technician 1 (G.1)

Explanation: TSSA Gas Technician/Oil Burner Technician Policies require G.2 candidates to have completed the G.3 program and hold a valid G.3 certificate (unless an approved assessment/exemption pathway applies).

5Within typical Ontario G.2 practice, a Gas Technician 2 works unsupervised on gas appliances up to approximately what maximum input?

A.200,000 BTU/h

B.Unlimited input

C.400,000 BTU/h

D.100,000 BTU/h

Explanation: G.2 is the intermediate certificate for residential and light-commercial equipment. Advancement toward G.1 requires documented experience on systems over 400,000 BTU/h under G.1 supervision, which demarcates the G.2 input scope used in Ontario training and practice.

6For a TSSA Gas Technician 2/3 Fuels written exam, which statement about reference materials is correct?

A.No code books are allowed; the exam is fully closed-book

B.Candidates may use smartphones to look up CSA clauses

C.Candidates may bring unmarked permitted codes and regulations (highlighting and page dividers allowed)

D.Only photocopies of highlighted study notes are permitted

Explanation: The TSSA Examination Prep Guide states Fuels candidates must bring their own permitted reference materials (Act, regulations, CAD, B149.1/B149.2). Materials must be unmarked/unaltered except for page/section dividers or highlighting of sections, words, or clauses. Electronics are prohibited.

7If a Fuels candidate fails a TSSA multiple-choice examination, when are they typically eligible to re-write?

A.After 30 days

B.Immediately the next day

C.After 14 days

D.After 60 days

Explanation: The TSSA Certification Examination Preparation Guide lists a 30-day re-write eligibility period for Fuels (and Elevating/Amusement/Ski Lift and BPV). Operating Engineers wait 60 days.

8Before installing a gas appliance, a G2 technician must verify the equipment is approved. Which evidence best confirms approval for use in Canada/Ontario?

A.A manufacturer warranty card

B.A purchase invoice only

C.A recognized certification/approval mark (e.g., CSA, cUL) or provincial field approval

D.A model number printed on the carton

Explanation: CSA B149.1 requires appliances and accessories to be certified by an accredited agency bearing a recognized certification mark, or to hold an applicable provincial/special field approval. Uncertified equipment must not be installed.

9What is the primary purpose of a drip leg (dirt pocket) installed in a gas supply line ahead of an appliance?

A.Collect moisture, scale, and debris before they enter the appliance controls

B.Reduce specific gravity of the fuel gas

C.Increase manifold pressure

D.Act as a primary shut-off valve

Explanation: A drip leg/dirt pocket traps condensate, scale, and debris so they do not foul regulators, valves, or burners. CSA B149.1 piping rules require drip legs where needed based on piping orientation and appliance connections.

10When sizing gas piping or tubing for an appliance system, the technician must primarily ensure that:

A.All piping is oversized to at least 2-inch schedule 40

B.Only the shortest possible run is used, regardless of diameter

C.Pipe diameter is the same as the water line

D.Pressure drop under load stays within allowable limits so appliance inlet pressure remains adequate

Explanation: Piping/tubing is sized so that friction losses do not drop supply pressure below the appliance’s required inlet pressure at design load. CSA B149.1 provides allowable pressure and pressure-drop criteria and sizing methods/tables.

About the TSSA Gas Technician 2 (G2) Exam

The Ontario TSSA Gas Technician 2 (G.2) certificate authorizes unsupervised work on natural gas and propane appliances and equipment within the G.2 scope (typically up to 400,000 BTU/h), after holding G.3 and completing accredited modules 10–24. The written exam is multiple choice, Fuels pass mark 75%, with up to 3.5 hours allowed. Candidates study CSA B149.1/B149.2 plus advanced piping, electricity and controls, meters/regulators, domestic appliances, water heaters, furnaces, hydronics, decorative appliances, venting, and air-handling topics.

Assessment

Multiple-choice written Fuels exam covering regulatory sector knowledge plus G.2 technical content (CSA Gas Trade modules 10–24 and CSA B149.1/B149.2). 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 2 (G2) Exam Content Outline

Codes, Regulations & G2 Scope

TSS Act, O. Reg. 215/01, B149.1/B149.2, CAD, G.2 scope and permitted references

Advanced Piping & Tubing

Module 10 piping/tubing systems, sizing, supports, testing, and drip legs

14%

Electricity & Controls

Modules 11–12 electricity, thermostats, flame sensing, and safety controls

Building as a System

Module 13 building pressure, depressurization, and combustion air interactions

Meters, Regulators & Relief

Module 15 meters, regulators, over-pressure protection, and relief

22%

Domestic Appliances, Water Heaters & Conversion

Modules 14 and 16–18 domestic appliances, refrigerators, conversion, water heaters

13%

Forced Warm Air, Add-Ons & Air Handling

Modules 19, 23–24 furnaces, add-on devices, and air handling

Hydronic Heating

Module 20 boilers and hydronic system essentials within G2 scope

Space Heaters & Decorative Appliances

Module 21 space heaters, fireplaces, and decorative appliances

10%

Venting Practices

Module 22 vent categories, connectors, combustion air, and draft/spillage

How to Pass the TSSA Gas Technician 2 (G2) Exam

What You Need to Know

Passing score: 75%
Assessment: Multiple-choice written Fuels exam covering regulatory sector knowledge plus G.2 technical content (CSA Gas Trade modules 10–24 and CSA B149.1/B149.2). 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 2 (G2) Study Tips from Top Performers

1Tab CSA B149.1 for piping, clearances, venting, and combustion-air clauses — G2 is heavily code-application, not pure memorization

2Drill module 10 piping sizing and drip-leg/dirt-pocket rules and module 22 vent categories (I–IV) with Type B vs special plastic vent

3Memorize gas properties: natural gas SG ~0.6 (rises); propane SG ~1.52 (settles low); know typical residential manifold pressure ranges for NG vs LP

4Practice flame-supervision basics: thermocouple millivolts, thermopile, flame rectification, and what a limit/rollout/pressure switch proves

5Review building-as-a-system depressurization effects on natural-draft appliances before exam day

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 G2 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 G2 written exam?

TSSA does not publish a fixed G2 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 G2 certificate scope in Ontario?

Gas Technician 2 (G.2) is the intermediate certificate for unsupervised work on gas appliances and equipment within the G.2 scope—generally appliances up to 400,000 BTU/h. Work above that input requires a G.1 pathway and supervised experience rules.

What do I study for the G2 exam?

Accredited G.2 training covers CSA Gas Trade modules 10 through 24 plus CSA B149.1 (Natural Gas and Propane Installation Code), CSA B149.2 (Propane Storage and Handling Code), the Technical Standards and Safety Act, and applicable Fuels regulations and Code Adoption Documents.

Can I bring code books into the TSSA G2 exam?

Yes. For Gas Technician 2/3 exams, TSSA permits unmarked Technical Standards and Safety Act materials, Fuels regulations and Code Adoption Documents, CSA B149.1, CSA B149.2, and optionally B149.2S1. Page/section dividers and highlighting of text are allowed; other notes or electronics are not.

How much does the TSSA G2 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.