Red Seal Truck & Transport 310T: 2026 Weighting Guide
The Red Seal Truck and Transport Mechanic (310T) Interprovincial Examination contains 135 multiple-choice questions, distributed across 11 Major Work Activities (MWAs). Knowing how those questions are split is the difference between studying evenly and studying where the marks actually are.
Truck and Transport Mechanic (310T) Exam Breakdown (Official)
- Total Exam Questions: 135 multiple-choice questions
- Major Work Activities: 11 (A–K)
- Source: Red Seal Exam Breakdown — Truck and Transport Mechanic (310T), red-seal.ca
- Time allowed: 4 hours — the same for every Red Seal trade, whether the paper is 100 or 150 questions
- Passing mark: 70% (95 / 135 correct)
- Time and pass mark are set provincially, not by the Red Seal Occupational Standard. Confirmed against Skilled Trades Ontario and SkilledTradesBC.
1. Question count by Major Work Activity
The figures below come directly from the official Red Seal breakdown:
| Major Work Activity | Share | Questions |
|---|---|---|
| MWA A Common Occupational Skills |
6% | 8 Qs |
| MWA B Services, diagnoses and repairs engines and supporting systems |
16% | 21 Qs |
| MWA C Services, diagnoses and repairs air systems and brake systems |
13% | 17 Qs |
| MWA D Services, diagnoses and repairs electrical and electronic systems |
16% | 22 Qs |
| MWA E Services, diagnoses and repairs drive trains |
13% | 17 Qs |
| MWA F Services, diagnoses and repairs steering, chassis/frames, suspensions, tires, wheels and hubs |
13% | 18 Qs |
| MWA G Services, diagnoses and repairs cabs |
4% | 5 Qs |
| MWA H Services, diagnoses and repairs trailers |
6% | 8 Qs |
| MWA I Services, diagnoses and repairs climate control systems |
5% | 7 Qs |
| MWA J Services, diagnoses and repairs hydraulic systems |
6% | 8 Qs |
| MWA K Services, diagnoses and repairs hybrid and electric vehicles (EV) |
3% | 4 Qs |
2. What the weighting tells you to study first
The two heaviest blocks carry 32% of the paper between them: MWA D (Services, diagnoses and repairs electrical and electronic systems, 22 questions) and MWA B (Services, diagnoses and repairs engines and supporting systems, 21 questions). Prioritizing high-weight blocks first builds your cushion toward the 95-question pass threshold.
A practical priority sequence by exam weight is: D → B → F → C → E → A → H → J → I → G → K, adjusted for which areas you perform least often on the job.
3. Three questions at exam standard
These are representative questions from the Red Seal Pass Truck and Transport Mechanic (310T) bank (1,350 questions total), shown with worked explanations:
What is the primary function of a turbocharger wastegate actuator on a heavy diesel engine?
- A) Divert intake charge air back to the atmospheric cleaner during engine deceleration.
- B) Restrict exhaust manifold backpressure to accelerate internal EGR gas recirculation.
- C) Bypass exhaust gas around the turbine wheel at high speed to control maximum boost pressure.
- D) Modulate exhaust backpressure to heat downstream catalytic substrates during low load.
Answer: C
A wastegate opens a bypass port in the turbine housing, diverting high-energy exhaust gases away from the turbine wheel to limit turbine speed and regulate maximum compressor boost pressure to safe engine design limits.
A heavy-duty truck's ABS warning light is on, and diagnostics reveal a fault code 'C0220 - Right Front Wheel Speed Sensor Open Circuit'. Using a multimeter, the technician measures infinite resistance across the sensor's two terminals and zero voltage output during a slow wheel rotation. What is the most appropriate immediate action?
- A) Inspect the sensor's wiring harness for damage or corrosion, starting from the sensor connection to the ECU.
- B) Replace the wheel speed sensor for the right front wheel.
- C) Check the air pressure at the right front ABS modulator valve.
- D) Perform a complete ABS system bleed and recalibration procedure.
Answer: B
An 'Open Circuit' fault, combined with infinite resistance across the sensor and zero voltage output when rotated, unequivocally indicates an internal break in the sensor's coil or wiring. While inspecting the harness (A) is good practice, these specific electrical measurements confirm the sensor itself is the issue. If the circuit was open, there would be no continuity, hence infinite resistance. If the sensor has an open circuit, it cannot generate a voltage signal. Replacing the sensor (B) is the most direct solution. Checking air pressure (C) or performing a system bleed/recalibration (D) are irrelevant to an open wheel speed sensor circuit.
An automated transmission shifts slowly. Air pressure at the transmission inlet is within specification, but pressure at the clutch actuator drops during shifts. The lines are good. What is the most probable cause?
- A) A faulty input speed sensor sending a low reading to the TCM
- B) A worn clutch that slips each time a shift is made
- C) A low transmission oil level starving the gears of oil
- D) A faulty valve or regulator inside the transmission air system
Answer: D
Good supply with low actuator pressure means the valves or regulator between them are restricting or leaking. In professional commercial vehicle service, choosing 'A faulty valve or regulator inside the transmission air system' is the verified industry practice because it aligns with manufacturer engineering standards and directly rectifies the underlying failure mechanism. Conversely, alternative actions like 'A faulty input speed sensor sending a low reading to the TCM' or 'A worn clutch that slips each time a shift is made' do not correct the root fault and can introduce operational hazards or equipment damage. Heavy-duty drivetrain components must maintain precise running clearances and backlash tolerances. Correct clutch adjustment and driveshaft operating angles prevent torsional vibration, bearing brinelling, and premature component fatigue.
4. How to practise against this blueprint
Our Truck and Transport Mechanic (310T) practice quiz starts with 10 interactive readiness questions with worked explanations and step-by-step trade math, and our full bank contains 1,350 questions with spaced-repetition review. The full 135-question timed mock exam is calibrated to the exact MWA split above so your diagnostic report shows which activity is costing you marks.
Next step for your Truck and Transport Mechanic (310T) exam
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Truck and Transport Mechanic (310T) 10-question readiness quiz · Full 135-question timed mock exam
🎧 Watch & Listen: 30 Truck & Transport Mechanic (310T) Practice Questions & Worked Answers
Weighted to the official Red Seal Truck & Transport Mechanic (310T) exam breakdown, read aloud with a 5-second pause before each worked answer and code explanation.
Take the Truck & Transport Mechanic (310T) Exam Simulation
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