Red Seal Sheet Metal Worker (308A) Official Timed Mock Exam Simulator
Prepare for your Certificate of Qualification (C of Q) exam with our authentic 120-question 4-hour simulation. Built precisely to the National Occupational Standard blueprint with 70% pass threshold verification.
π 120 Exam Questions
β±οΈ 4 Hours (240 Mins)
π― 70.0% Pass Standard
π MWA Diagnostic Scorecard
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2026 RSOS Blueprint Distribution for Sheet Metal Worker (308A)
Major Work Activity (MWA)
Target Questions
Exam Weight
MWA A: Common Occupational Skills (μμ Β·μ λΒ·κΈ°νΈ)
14 Qs
12%
MWA B: Pattern Layout & Triangulation (μ κ°λΒ·μΌκ°λ²)
MWA D: Air Distribution Systems (곡쑰λνΈμ€μΉΒ·λνΌΒ·λν¨μ )
25 Qs
21%
MWA E: Architectural Sheet Metal (μΈμ₯νλ¬Β·νλ μ±)
15 Qs
12%
Total Red Seal Exam Length
120 Questions
100%
Sample Diagnostic Practice Questions
Try these sample questions from our Sheet Metal Worker (308A) question bank. Select an answer to see instant feedback and explanation.
Q1. A sheet metal worker is installing ductwork at a height of 3.5 meters (approximately 11.5 feet) above a concrete floor. The work area is open, with no guardrails available. Which of the following fall protection methods is required as the primary control measure, assuming work cannot be performed from an aerial lift?
Worked Explanation: In Canada, work at heights typically exceeding 3 meters (or 10 feet in some jurisdictions) requires fall protection. When fall restraint (preventing a fall) is not feasible, a personal fall arrest system (stopping a fall after it occurs) is the primary personal protective measure. This involves a full-body harness, a lanyard with a shock absorber, and a suitable anchor point. Safety nets are a collective fall protection measure but are generally secondary to personal systems in many construction scenarios. Administrative controls alone are insufficient at this height.
Q2. A sheet metal worker is installing 25 mm (1 inch) thick fibrous duct liner in a rectangular supply duct. What is the correct method, according to SMACNA, for sealing the longitudinal butt joints of the liner sections?
Worked Explanation: According to SMACNA standards (e.g., Duct Liner Application Standard), all longitudinal and transverse butt joints in fibrous duct liner are required to be coated with an approved fire-resistant adhesive and securely butted together. This ensures a continuous, smooth surface for airflow and prevents air erosion of the insulation fibers.
Q3. A sheet metal worker is installing a VAV terminal box in a building's main supply air system, which operates at a static pressure of 4 inches water gauge (w.g.). According to SMACNA HVAC Duct Construction Standards, what is the minimum recommended seal class for the connections of the terminal box to the main supply ductwork?
Worked Explanation: For duct systems operating at static pressures above 3 inches w.g. (including 4 inches w.g.), SMACNA HVAC Duct Construction Standards (current editions often reference up to 10" w.g. for Class A) typically recommend Seal Class A for all transverse joints, longitudinal seams, and duct wall penetrations. This ensures minimal leakage in higher pressure systems, which is critical for VAV box performance and system efficiency. Seal Class B is for lower pressure systems (1-3" w.g.), and Class C is for very low pressure (up to 1" w.g.) systems.