310T Study Guide 2026

Everything you need to pass the 310T exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

310T exam key facts

The Red Seal exam for Truck and Transport Mechanic (Ontario 310T Truck and Coach Technician) has 135 multiple-choice questions. Source
The pass mark for a Red Seal exam, including Truck and Transport Mechanic, is 70%. Source
The 310T Truck and Coach Technician certifying exam costs $150 + HST per attempt, paid through the Skilled Trades Ontario Portal. Source
A candidate who fails the 310T exam must wait 30 days before retaking it and must pay the exam fee again before rescheduling. Source
On finishing an apprenticeship, the Provisional Certificate of Qualification is valid for one year to give time to pass the 310T exam. Source

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📋 310T Exam Format at a Glance

135

Questions

240 min

Time Limit

70.00%

Passing Score

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📚 310T Topics to Study (96)

Air Brakes and Braking Systems · 7 cards Air Brakes and Braking Systems · 7 cards Air Brakes and Braking Systems · 7 cards Air Brake Systems Diagnosis · 7 cards Air Brake Systems Diagnosis · 7 cards Air Brake Systems Diagnosis · 7 cards Air Brake Systems Diagnosis · 7 cards Career Opportunities and Advancements · 7 cards Career Opportunities and Advancements · 7 cards Drivetrain and Transmission · 7 cards Drivetrain and Transmission · 7 cards Drivetrain and Transmission · 7 cards Drive Train Systems · 7 cards Electrical and Electronic Systems · 7 cards Electrical and Electronic Systems · 7 cards Electrical and Electronic Systems · 7 cards Engine and Fuel Systems · 7 cards Engine and Fuel Systems · 7 cards Engine and Fuel Systems · 7 cards Evaluation and Testing Process · 7 cards Evaluation and Testing Process · 7 cards Evaluation and Testing Process · 7 cards Evaluation and Testing Process · 7 cards HVAC and Cab Systems · 7 cards HVAC and Cab Systems · 7 cards HVAC and Cab Systems · 7 cards Practical Skills and Training · 7 cards Practical Skills and Training · 7 cards Practical Skills and Training · 7 cards Practical Skills and Training · 7 cards

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✍️ Sample 310T Questions & Answers

1. A Class 8 truck exhibits a harsh 1-2 upshift in an Allison automatic transmission. What is the MOST likely cause?

✓ Faulty turbine speed sensor

A faulty turbine speed sensor provides incorrect shaft speed data, causing the TCM to miscalculate shift timing and produce harsh upshifts.

2. What is the primary purpose of a diesel engine's unit injector (UI) system compared to a common rail system?

✓ Each unit injector generates its own high pressure, eliminating a separate high-pressure pump

In a unit injector system, the injector itself generates high pressure via a rocker-arm-driven plunger, unlike common rail which uses a central pump.

3. What is the purpose of the walk-around inspection portion of a commercial vehicle preventive maintenance check?

✓ To systematically inspect the vehicle's exterior, tires, lights, and visible undercarriage components

A structured walk-around ensures that exterior body, tires, lights, and undercarriage items visible during the circuit are checked in a consistent, repeatable sequence.

4. In a dual-circuit air brake system, which reservoir is pressurized first by the compressor?

✓ Wet (supply) tank

Air from the compressor flows first into the wet (supply) tank where moisture collects, then through check valves into the primary and secondary circuit reservoirs.

5. During a brake balance test, the rear axle brakes grab harder than the front axle brakes. The FIRST area to inspect is:

✓ Proportioning/limiting valve operation on the front circuit

A malfunctioning front-axle limiting or proportioning valve reduces delivered pressure to the front brakes, creating a front-to-rear imbalance.

6. A technician is sliding a trailer's tandem axle group rearward. What is the PRIMARY reason a driver would want the tandem positioned fully rearward?

✓ To shift weight rearward off the fifth wheel and reduce the drive axle load

Sliding the tandem rearward shifts load off the fifth wheel (and consequently off the tractor's drive axles) and places more weight on the trailer axles. Drivers do this to reduce drive-axle overloading. Sliding forward concentrates weight over the fifth wheel onto the drives. Stability is not improved by rearward tandem position (it can actually increase trailer sway). Kingpin-to-rear-axle distance regulations exist, but the primary operational reason for sliding rearward is axle-weight management.

🎯 Free 310T Practice Tests

Career Opportunities and Advancements · 7 questions Electrical and Electronic Systems · 7 questions Practical Skills and Training · 7 questions Drivetrain and Transmission · 7 questions Practical Skills and Training · 7 questions Electrical and Electronic Systems · 7 questions Steering and Suspension Systems · 7 questions Steering and Suspension Systems · 7 questions Steering and Suspension Systems · 7 questions Electrical and Electronic Systems · 7 questions

📖 310T Guides & Articles

Your 310T Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 310T Flashcards (612)🏆 310T Exam Simulation

What Practice Test Geeks adds beyond an AI chat for 310t

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

A timed, full-length 310t mock exam — 135 questions in 240 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
A fixed 310t question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
A printable 310t cheat sheet you can print or save as a PDF.
310t flashcards built from the same question bank.
Free 310t practice tests with the correct answer shown after each question.

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How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

skilledtradesontario.ca — Test delivery, eligibility, fees, retake policy, retake fee, score validity, renewal · verified Oct 2026
red-seal.ca — Exam format, passing score · verified Oct 2026