Based on the Red Seal Transport Trailer Technician exam blueprint: brakes, suspension, axles and wheel ends, coupling devices, electrical, hydraulics and refrigeration
Practice on the go and jump straight back to where you left off.
About the certification
In Ontario, Truck-Trailer Service Technician is trade code 310J, a compulsory trade administered by Skilled Trades Ontario. The apprenticeship is 4,480 hours: 4,000 on the job and 480 in school. Across Canada it is the Red Seal trade Transport Trailer Technician, so passing the Certificate of Qualification exam also earns the interprovincial Red Seal endorsement.
The Red Seal exam has 100 multiple-choice questions in 8 blocks: common occupational skills (6 questions), suspension systems (14), brake systems (18), axles and wheel end assemblies (15), trailer chassis, bodies, coupling devices and landing gear (17), electric and electronic systems (14), hydraulic systems (6) and temperature control systems (10). Between 10 and 20% of the questions test knowledge and recall, 40 to 50% procedural and application, and 35 to 45% critical thinking. The Red Seal self-assessment guide gives the pass mark as 70%.
ExamHub's free 310J practice quiz has 160 original questions weighted to the real exam blocks, with an explanation and a source for every answer. Questions draw on the Red Seal standard, the CCMTA National Safety Code Standard 11B, the MTO Official Air Brake Handbook and Ontario regulations on safety inspections and vehicle dimensions.
What's covered
Categories follow the 8 Red Seal exam blocks, weighted like the real exam.
Try a few
Five sample questions from the question bank, with the answer and explanation.
Why: The MTO chart gives 64 mm for a 30LS and 45 mm for a standard size 24. The 30LS at 62 mm is within its limit, but the size 24 at 48 mm exceeds 45 mm. Each chamber must be judged against its own size and type.
Why: NSC 11B rejects a trailer kingpin that is bent, broken, cracked, deformed, loose, worn or repaired by welding. The kingpin gauge listed in the RSOS is how wear is measured, and a worn pin is replaced.
Why: O. Reg. 413/05 s.10(1) requires designated combinations 2 and 9 with a semi-trailer tandem axle spread over 1.85 m to have an automatic device locking the self-steering axle straight ahead when travelling over 60 km/h. At 1.9 m the spread exceeds 1.85 m, so the lock must work.
Why: NSC 11B rejects a tread cut or crack longer than 25 mm that extends deeper than a major tread groove, extends into the casing ply, or exposes body cord. Any one of those conditions is enough, so tread depth elsewhere does not matter.
Why: A vehicle longer than 9.1 m (30 ft) must have an amber intermediate side marker lamp on each side in addition to the amber front and red rear side markers.
FAQ
The Red Seal Transport Trailer Technician exam has 100 multiple-choice questions, each with four options and one correct answer. ExamHub's bank has 160 questions, and Test Mode draws a 100-question timed simulation.
The Red Seal self-assessment guide for this trade gives the pass mark as 70%. The Red Seal exam page does not state a time limit, and ExamHub's Test Mode allows up to 4 hours.
8 blocks: common occupational skills (6 questions), suspension systems (14), brake systems (18), axles and wheel end assemblies (15), trailer chassis, bodies, coupling devices and landing gear (17), electric and electronic systems (14), hydraulic systems (6) and temperature control systems (10). Brakes and chassis and coupling devices carry the most questions.
Yes. Truck-Trailer Service Technician (310J) is a compulsory trade in Ontario, administered by Skilled Trades Ontario. The apprenticeship is 4,480 hours: 4,000 on the job and 480 in school. Passing the exam leads to the Certificate of Qualification, and the trade is part of the Red Seal program as Transport Trailer Technician.
No. These are original practice questions written from the Red Seal standard and free public sources. They are not copies of exam questions.