Timed practice under real exam conditions — download it, print it, and find out exactly where you stand.
No email address, no account, no signup — the file downloads straight away. Every answer is explained in the back of the PDF. Print it, or keep it on your phone for the lunchroom.
This mock exam is a 50-question slice. The 308A Complete Question Bank has all 120 questions with a full explanation for every answer, organized by the six topic areas of our practice bank, in one printable offline PDF.
Get the 308A Question Bank — CA$19 →Corrections to the question banks are listed with dates on the question bank updates page.
The full 308A bank is 120 questions across six topic areas. Sheet metal is unusual in how much of it is drawing and calculating rather than recalling. Each area, and what to watch for:
Sheet Metal Fabrication — 24 questions. Gauge and material selection, bend and seam allowances, brake and shear work, seam types — Pittsburgh, grooved, standing, drive cleat — stiffening by cross-breaking and beading, and mechanical fastening. For bend allowance, work from the neutral axis, not the outside dimension: it shifts with thickness and bend radius, so a stretch-out that is close on light gauge is well out on heavier stock. Pick a seam by the pressure class the question gives, not by shop habit.
Layout & Pattern Development — 20 questions. Parallel line, radial line and triangulation development; true length lines; square-to-round transitions; offsets; elbow gores and throat radius. Choose the development method first — parallel line only works when the elements are parallel, radial line needs a common apex, everything else has to be triangulated. Then check true length: a line taken off a foreshortened view and stepped onto the pattern will not close.
HVAC Systems — 27 questions. Duct sizing and static pressure, equal friction against static regain, fitting loss, dampers, air balancing, insulation and vapour barrier placement, and where duct leakage class matters. A fitting's loss is not just its length — a hard ninety with no turning vanes can cost more pressure than the straight run it sits in. On balancing questions, look to terminals and dampers before fan speed.
Welding & Joining — 20 questions. Soldering and brazing on light gauge, spot and tack welding, GMAW on thin material, filler and flux selection, distortion control, and joining with rivets and screws. Heat input, sequence and clamping are what keep a panel flat, and any answer amounting to "more heat, move faster" is usually wrong. Solder against braze turns on the filler's melting point, not on how strong the joint looks.
Safety & Code — 15 questions. Cut hazards from sheared edges, fall protection on roof and deck, lockout, WHMIS, and the standards governing duct construction, fire and smoke dampers, and clearance to combustibles. For fire dampers, the requirement follows the rating of the assembly the duct passes through, not the duct itself.
Tools & Equipment — 14 questions. Shears, brakes, rolls, notchers, turning machines, plasma and track-mounted cutting, hand seamers and layout tools. The smallest block. Know the setup and maintenance points: brake radius and clamping pressure, roll adjustment, blade clearance on a shear.
Sit it timed, in one go, with nothing open — the first pass exists to show what you know cold. Mark a dot beside every question you guessed at, including the confident guesses.
Score it twice: the count you got wrong, then the count you got right with a dot beside it. The second number is the more honest one. Put both in one pile and sort by topic.
The 308A mix makes what comes next unusually clear. Just over a third of the bank — Fabrication plus Layout & Pattern Development — is work done with a pencil, a rule and a calculator, not work you recall. If the misses land there, do not just re-read the explanation: redraw the development on scrap, step the true lengths off yourself, and check whether your pattern closes. That is the only review that transfers. HVAC Systems misses are chart and table problems instead, so work them with a friction chart open until finding the value stops being the slow part. Welding, Safety and Tools misses are single facts; flashcards clear them.
The published examination weightings are a free planning document for any sheet metal apprentice. On the Sheet Metal Worker exam information page, the current interprovincial exam is 120 questions across five Major Work Activities: installing air and material handling systems 41 questions, fabrication 38, common occupational skills 24, roofing and specialty products 10, and maintenance and repair 7 (checked September 2026). The Red Seal exam preparation guide gives the format as multiple choice, four options, one correct answer worth one mark, four hours of writing time, and a pass mark of 70%. Provincial and territorial authorities administer it, so check the details for your jurisdiction.
Red Seal has published a new (2026) occupational standard for this trade and exams built on it are under development. That standard keeps the exam at 120 questions but changes the weightings to common occupational skills 21%, fabrication 28%, air and material handling systems 34%, roofing and specialty products 10% and maintenance and repair 7% (checked September 2026), so the breakdown above will change once those exams come into use. Check the trade page at red-seal.ca before you book.
Two honest notes on how our bank lines up. The published standard folds layout and pattern development into fabrication and common skills while we pull it out as its own block — same content, different label. And roofing and specialty products carries 10% there but gets only light coverage here, mostly inside the Fabrication questions, so study it elsewhere if architectural metal is your daily work.
Do I need drawing tools to work through it? A calculator and a pencil covers most of it. The Layout & Pattern Development questions are answered by reasoning about method and geometry, not by drawing a finished pattern — but keep dividers, a square and scrap handy and develop a few properly.
Is it imperial or metric? Both, because both are still in daily use in Canadian sheet metal shops — gauge and inches on stock and fittings, metric on plenty of drawings. Moving between them without stalling is part of the skill.
How is 308A different from the HVAC trades? Sheet metal work centres on making and installing the metal: developing patterns, forming, seaming, hanging and sealing duct. Refrigeration and air conditioning trades centre on the equipment, refrigerant circuits and controls. They meet at the air side, which is why our HVAC Systems block covers duct sizing, static pressure and balancing but not refrigeration cycles.
Prefer to practice online right now? Take the free 308A quiz →
Independent, unofficial study resource — not affiliated with or endorsed by the CCDA, the Red Seal Program, or any provincial/territorial apprenticeship authority. All questions are original works. No guarantee of results.