Red Seal Heavy Duty Equipment Technician (421A) 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 Heavy Duty Equipment Technician (421A)
Major Work Activity (MWA)
Target Questions
Exam Weight
MWA A: Common Occupational Skills (μμ ·곡ꡬ·μ κ²)
12 Qs
10%
MWA B: Diesel Engines (μ€μ₯λΉ λμ €μμ§Β·ν°λ³΄Β·νμ²λ¦¬)
24 Qs
20%
MWA C: Hydraulics & Hydrostatics (μ μννΒ·λ°ΈλΈΒ·μ€λ¦°λ)
26 Qs
22%
MWA D: Electrical & Electronics (μ μ₯νλ‘Β·λͺ¨λν°λ§)
24 Qs
20%
MWA E: Heavy Drivetrains (νμμννΈ λ³μκΈ°Β·μ΅μ’ κ°μκΈ°)
18 Qs
15%
MWA F: Steering, Suspension & Undercarriage (νλΆνΈλΒ·μ λ)
16 Qs
13%
Total Red Seal Exam Length
120 Questions
100%
Sample Diagnostic Practice Questions
Try these sample questions from our Heavy Duty Equipment Technician (421A) question bank. Select an answer to see instant feedback and explanation.
Q1. A heavy duty technician is working with a strong degreaser labeled with a specific hazard. Which WHMIS 2015 pictogram would indicate that this degreaser could cause severe skin burns or serious eye damage, and corrode certain metals?
Worked Explanation: The 'Corrosion' pictogram (a hand and a surface being corroded) is used to identify products that can cause severe skin burns, eye damage, or are corrosive to metals. This is a primary hazard associated with strong acids, bases, and certain degreasers. The 'Flame over circle' is for oxidizers, 'Exploding bomb' for explosives/self-reactives, and 'Skull and crossbones' for acute toxicity (fatal or toxic).
Q2. When performing a pin and bushing turn on a dry track chain, what is the primary benefit and the expected outcome for the undercarriage life?
Worked Explanation: A pin and bushing turn is a common maintenance procedure for dry track chains. It involves pressing out the pins and bushings, rotating them 180 degrees, and reassembling them. This effectively presents the unworn side of the pin and bushing to the sprocket, providing a 'new' wear surface and significantly extending the life of the track chain before replacement is necessary. It does not lubricate them or shorten the chain, but rather utilizes the remaining wear material.
Q3. When performing refrigerant recovery on an R1234yf system on a modern heavy-duty truck, which additional safety precaution is *most crucial* compared to working with R134a systems?
Worked Explanation: R1234yf is a mildly flammable refrigerant (A2L classification), unlike R134a which is non-flammable. Therefore, ensuring excellent ventilation to prevent the accumulation of refrigerant vapours that could reach their lower flammability limit is paramount when working with R1234yf. While the other options are general good safety practices for any refrigerant handling, the flammability of R1234yf makes ventilation the most critical additional precaution specific to this refrigerant type.