Free Red Seal Gasfitter – Class A Interprovincial Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Red Seal Gasfitter – Class A Interprovincial Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A gasfitter is preparing to store a WHMIS hazardous pipe-thread compound. Which section of its safety data sheet should the gasfitter consult for safe storage instructions?

   1. A.Section 2: Hazard identification
   2. B.Section 4: First-aid measures
   3. C.Section 7: Handling and storageCorrect answer: C
   4. D.Section 8: Exposure controls

   Explanation: CCOHS advises workers to "understand safe handling and storage instructions (Section 7)". Sections 2, 4 and 8 address other SDS information categories.

   Reference: CCOHS WHMIS Basics — Safety Data Sheet (SDS)

2. 2A gasfitter cuts a section of fuel-gas pipe and finds a raised ridge at its inside edge. Which tool should be selected to remove that ridge?

   1. A.A pipe reamerCorrect answer: A
   2. B.A pipe threader
   3. C.A pipe cutter
   4. D.A pipe bender

   Explanation: The occupational standard specifies reaming to "remove burrs and scales f rom ends". The BC piping module similarly says, "Ream all cut tube ends to the full inside diameter of the tube to remove the small burrs created by cutting." A pipe reamer removes the internal ridge; a threader, cutter and bender serve different pipe-preparation functions.

   Reference: Red Seal Occupational Standard – Gasfitter – Class A — Printed page 50, fuel-system piping preparation, reaming performance row

3. 3A qualified Ontario certificate holder discovers an outdoor B vent not certified for exterior use that meets FS-279-26's conditional continued-use provisions. Within how many days must the initial notification be provided to the fuel distributor?

   1. A.7 days
   2. B.14 daysCorrect answer: B
   3. C.30 days
   4. D.90 days

   Explanation: Clause 8.17.3.1 requires initial distributor notification "within 14 days of discovery of the B vent". This condition is separate from the rule for replacement when the connected appliance is replaced.

   Reference: Ontario Gaseous Fuels CAD Amendment FS-279-26 — Clause 8.17.3.1(b)

4. 4In Ontario, an appliance regulator for gas lighter than air has an inlet pressure of 2 psig or less and meets the other FS-279-26 clause 10.6.2(a) conditions for a leak-limiting system. What is the maximum permitted leakage rate for gas of the specified specific gravity?

   1. A.1.0 ft³/h
   2. B.2.5 ft³/hCorrect answer: B
   3. C.5.0 ft³/h
   4. D.10.0 ft³/h

   Explanation: For the lighter-than-air case, the regulator's leak-limiting system restricts escape to "not more than 2.5 ft3 (0.0708 m3) per hour" for gas of specific gravity 0.6, subject to the other stated conditions.

   Reference: Ontario Gaseous Fuels CAD Amendment FS-279-26 — Clause 10.6.2(a)

5. 5A dual-fuel Ontario waste-gas boiler is installed under FS-279-26 clause 21.3(b). Where is the check valve or equivalent placed on the standby-gas valve train?

   1. A.Immediately upstream of the standby-gas connectionCorrect answer: A
   2. B.Immediately downstream of the standby-gas connection
   3. C.Immediately upstream of the primary-gas connection
   4. D.Immediately downstream of the primary-gas connection

   Explanation: The clause places the valve "immediately upstream of the standby gas (secondary fuel) connection" to isolate the standby valve train.

   Reference: Ontario FS-279-26 (2026) — Clause 21.3(b)

6. 6An Ontario fuel-piping system within TSSA-HPP-2020 has a design pressure of 80 psig. If clause 6.2 applies and no clause 6.3 exception is used, what is its minimum hydrostatic test pressure?

   1. A.80 psig
   2. B.96 psig
   3. C.120 psigCorrect answer: C
   4. D.160 psig

   Explanation: Clause 6.2 requires a hydrostatic test "not less than 1.5 times the system design pressure". Thus 80 × 1.5 = 120 psig. The 96 psig alternative uses the pneumatic multiplier. The 80 psig option omits the multiplier, while 160 psig applies a factor of 2.0.

   Reference: TSSA Fuels Safety High Pressure Piping Code — Clause 6.2, page 8

7. 7Under Ontario's mandatory service checks for a qualifying residential natural-draft boiler with a draft control, where is the CO sample taken?

   1. A.Between the heat exchanger and draft controlCorrect answer: A
   2. B.Downstream of the draft control in the common vent
   3. C.At the draft-control relief opening
   4. D.At the outdoor vent termination

   Explanation: The Ontario amendment specifies "upstream of the draft control device (between the heat exchanger and the draft control device)".

   Reference: Ontario TSSA CAD FS-279-26 — Section 1, clause 7.1.13(b)

8. 8A gasfitter wants to check whether an isolated burner limit switch provides a complete electrical path when closed. Which digital multimeter mode is intended for this check?

   1. A.Continuity testCorrect answer: A
   2. B.AC voltage measurement
   3. C.DC voltage measurement
   4. D.Capacitance measurement

   Explanation: Fluke states that its multimeter's "Continuity Test mode" is suitable for testing switches and that a continuity test detects a complete path. The switch must be isolated and the circuit de-energized before the check.

   Reference: Fluke Guide to Continuity Testing with a Multimeter — Step 2; Applications of Continuity Testing

9. 9A straight section of fuel piping must span 26.0 in. between fitting centre lines. The job drawing specifies a 1.25 in. takeoff at each fitting. What cut length should be marked for the pipe?

   1. A.23.50 in.Correct answer: A
   2. B.24.75 in.
   3. C.27.25 in.
   4. D.28.50 in.

   Explanation: The standard requires pipe to be marked to length "considering f itting allowances". Subtract both takeoffs: 26.0 − 1.25 − 1.25 = 23.50 in. The other figures subtract one, add one, or add both takeoffs.

   Reference: Red Seal Occupational Standard – Gasfitter – Class A — B-5.02.05P, printed page 50

10. 10An Ontario gasfitter replaces a residential appliance while another appliance remains connected to the same chimney. Under FS-279-26 clause 8.12.2, a liner must be installed and short-term safe continued use is arranged. What is the maximum time allowed to complete the required liner installation?

    1. A.5 daysCorrect answer: A
    2. B.14 days
    3. C.30 days
    4. D.90 days

    Explanation: The amendment states that a required liner "shall be completed within 5 days for residential applications and 30 days for commercial applications". The question specifies a residential application and permitted short-term safe use.

    Reference: TSSA Gaseous Fuels Code Adoption Document Amendment — Section 1.33, clause 8.12.2(b), page 12