Free Red Seal Sheet Metal Worker Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Red Seal Sheet Metal Worker Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A sheet metal worker welds galvanized ductwork. Which metal oxide fume can form specifically from the galvanized coating?

   1. A.Cadmium oxide
   2. B.Iron oxide
   3. C.Zinc oxideCorrect answer: C
   4. D.Lead oxide

   Explanation: CCOHS identifies "zinc on galvanized steel (vaporizes to produce zinc oxide fume)". The zinc coating can therefore contribute zinc oxide fume when heated; the question concerns the coating rather than all fumes produced by the base metal.

   Reference: Welding - Fumes and Gases — How do coatings affect the composition of welding fumes?

2. 2A rectangular duct blank has a developed body width of 400 mm. The shop layout calls for a 12 mm seam allowance on each of its two lengthwise edges. What total blank width is needed?

   1. A.400 mm
   2. B.412 mm
   3. C.424 mmCorrect answer: C
   4. D.448 mm

   Explanation: The Red Seal standard says blank size is determined "allowing for seams and edges". Add both allowances: 400 + 12 + 12 = 424 mm. Omitting both gives 400 mm, adding one gives 412 mm, and adding four allowances gives 448 mm.

   Reference: Red Seal Occupational Standard – Sheet Metal Worker — B-5.01.02P

3. 3A fan's rotating motor transmits cyclic motion into the building frame. The installation detail calls for a resilient component directly beneath the equipment base. Which component serves that purpose?

   1. A.Spring isolatorCorrect answer: A
   2. B.Cable sway brace
   3. C.Concrete insert
   4. D.Seismic snubber

   Explanation: The manufacturer states, "Restrained spring isolators (Figure 3) reduce the transmission of noise and vibration into supporting structures from supported mechanical equipment." A spring isolator beneath the equipment base serves that vibration-isolation purpose; a sway brace, insert, or snubber serves a different support or restraint function.

   Reference: How to Adjust Floor Mounted Isolators for Noise and Vibration Free Operation — Restrained Spring Isolators; Application

4. 4When installing clip-attached standing-seam metal roofing, which normal repeated panel movement must the fastening arrangement accommodate to limit attachment fatigue?

   1. A.Expansion and contraction from temperature changesCorrect answer: A
   2. B.Deflection and rebound from foot traffic
   3. C.Expansion and contraction from moisture absorption
   4. D.Settlement and rebound from foundation loading

   Explanation: The Metal Construction Association states that standing-seam installations require fastening techniques "to allow for thermal expansion and contraction while also safeguarding against attachment fatigue." The clips must accommodate that repeated temperature-related movement.

   Reference: Standing Seam Roof Clips Best Practices Guide — White Paper; overview

5. 5During scheduled service of an air handler, which measurement across the filter can help determine when the filter needs changing?

   1. A.Pressure dropCorrect answer: A
   2. B.Temperature rise
   3. C.Motor current
   4. D.Duct humidity

   Explanation: The U.S. Department of Energy states, "Measuring the pressure drop across the filter is a convenient way of determining when it should be changed". The measurement is compared with the applicable maintenance criteria.

   Reference: EnergySmart Schools Operations and Maintenance Guide — Air Filters

6. 6A sheet metal worker is selecting protection against arc flash injury to the eye during welding. Which radiation is associated with this specific injury?

   1. A.Visible light
   2. B.Infrared radiation
   3. C.X-ray radiation
   4. D.Ultraviolet radiationCorrect answer: D

   Explanation: CCOHS states that "Certain types of UV radiation can produce an injury to the surface and mucous membrane (conjunctiva) of the eye" and identifies this injury as arc eye or arc flash. Ultraviolet radiation is therefore associated with the specified injury.

   Reference: Welding - Radiation and the Effects On Eyes and Skin — What are the symptoms of arc eye?

7. 7A shop must lay out a symmetrical right-cone fitting whose apex is within practical working distance. Which pattern-development method does the BCcampus trade text recommend for this fitting?

   1. A.Parallel-line development
   2. B.Radial-line developmentCorrect answer: B
   3. C.Triangulation development
   4. D.Straight-line development

   Explanation: The BCcampus text says, "Some objects are of a conical shape and parallel line will not work on them. Rather, we will look at using Radial Line Pattern Development." For a right cone with a practical centre it describes radial development as efficient. It also says, "Triangulation is the process used when nothing else works." Triangulation can produce a pattern, but it is not the text's preferred choice under these conditions.

   Reference: Pattern Development: Sheet Metal Level 1 – Brian Coey, BCcampus, CC BY 4.0 — Radial Line Pattern Development; introduction

8. 8A suspended duct run requires a specified attachment to limit its side-to-side movement during earthquake shaking. Which component provides the restraint?

   1. A.Cable sway braceCorrect answer: A
   2. B.Spring isolator
   3. C.Threaded hanger rod
   4. D.Sliding support

   Explanation: ASHRAE explains that "Suspended systems such as piping, equipment and ductwork need seismic braces to keep them from swaying during an earthquake." A cable sway brace provides that restraint; the other components perform different support or isolation roles.

   Reference: Earthquake Protection Bulletin — Suspended systems and seismic braces

9. 9A 15 m metal roof panel has a linear expansion coefficient of 0.000012 per °C. Approximately how much does its length increase for a 50°C temperature rise?

   1. A.0.9 mm
   2. B.4.5 mm
   3. C.9.0 mmCorrect answer: C
   4. D.18.0 mm

   Explanation: OpenStax gives the linear approximation "ΔL=αLΔT". Thus 0.000012/°C × 15 m × 50°C = 0.009 m = 9.0 mm. A tenfold unit-conversion error gives 0.9 mm; using 25°C gives 4.5 mm; using 100°C gives 18.0 mm.

   Reference: University Physics Volume 2 – Thermal Expansion — Linear Thermal Expansion, equation 1.2

10. 10A technician investigating a baghouse records a pressure drop of 2.0 in. w.g. on the previous inspection and 3.5 in. w.g. now. What is the percentage increase relative to the previous reading, rounded to two decimals?

    1. A.0.75%
    2. B.42.86%
    3. C.75.00%Correct answer: C
    4. D.175.00%

    Explanation: CCOHS lists "Excessive dust loading due to lack of maintenance and scheduled cleaning" as a possible cause of a sudden pressure-drop increase. OpenStax says, "Then we find what percent the amount of increase is of the original amount." The increase is 3.5 − 2.0 = 1.5 in. w.g.; 1.5 ÷ 2.0 × 100 = 75.00%. Omitting the multiplication by 100 gives 0.75%; dividing by the new reading gives 42.86%; comparing the new reading directly with the original gives 175.00%.

    Reference: Industrial Ventilation - 8. Troubleshooting — Air Cleaning devices; sudden increase in pressure drop