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Exam Review

Key Facts: Red Seal 310T Exam

100

Practice Questions

OpenExamPrep

70%

Passing Score

Red Seal Program

~24%

Air Brakes/Steering/Suspension Weight

Red Seal Occupational Standard

310T

Ontario Trade Code

Red Seal Program

13

Provinces/Territories Recognizing Red Seal

Red Seal Program

~$100-170

Provincial Exam Fee (CAD)

Provincial apprenticeship authorities

The Red Seal Truck and Transport Mechanic (310T), also known as Truck and Transport Technician, is the interprovincial standard for technicians who service, diagnose, and repair heavy commercial trucks, trailers, and buses. The Red Seal interprovincial (IP) exam is multiple-choice (commonly cited around 100-150 questions) with a 70% passing score, and provincial fees typically run about $100-170 CAD. The exam weights air brakes, steering and suspension most heavily (~24%), followed by diesel engines, fuel and emissions (~20%) and electrical/electronic systems (~18%), with drivetrains, HVAC/hydraulics/diagnostics, and common occupational skills making up the rest. Earning the Red Seal endorsement gives interprovincial mobility across all of Canada. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample Red Seal 310T Practice Questions

Try these sample questions to review concepts for the Red Seal 310T exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 135+ question experience with AI tutoring.

1Before working under a heavy truck raised on a hoist, what is the most important step a technician must take to prevent a crushing injury?
A.Apply the parking brakes only
B.Mechanical locks or rated safety stands
C.Chock one rear wheel
D.Leave the transmission in gear
Explanation: A hydraulic or air hoist can settle or fail, so its mechanical safety locks must be engaged (or rated safety stands positioned) before anyone works underneath. This provides a positive mechanical support independent of system pressure.
2A WHMIS 2015 Safety Data Sheet (SDS) is divided into how many standardized sections?
A.8
B.12
C.16
D.20
Explanation: Under WHMIS 2015 (aligned with GHS), every Safety Data Sheet follows a standardized 16-section format covering identification, hazards, composition, first aid, handling, and more. This consistent layout lets a technician quickly locate hazard and first-aid information.
3When using a sling to lift a heavy component, the rated working load of the sling decreases as the angle between the sling legs and the horizontal becomes:
A.A smaller angle, closer to horizontal
B.Larger (closer to vertical)
C.Exactly 90 degrees
D.Unaffected by angle
Explanation: As the sling angle to the horizontal decreases, the tension in each leg increases sharply, reducing the safe working load. Technicians use the sling manufacturer's angle-rated capacity chart and the planned configuration rather than assuming the vertical rating still applies.
4Which tool is used with a rigid base to measure brake-rotor or hub runout?
A.A carbon-pile load tester
B.A click-type torque wrench
C.A dial indicator
D.A tire tread-depth gauge
Explanation: A dial indicator mounted on a rigid base measures small axial or radial movement while the rotor or hub is rotated. The reading is compared with the OEM runout specification before deciding whether cleaning, indexing, machining, or replacement is required.
5An adjustable click-type torque wrench should be stored at the end of the day set to:
A.Its maximum setting
B.The lowest marked setting on its scale
C.The most commonly used value
D.Any value, storage setting does not matter
Explanation: A click-type torque wrench should be backed off to its lowest scale setting (not zero) for storage to relieve tension on the internal spring and preserve calibration accuracy. Leaving it set high keeps the spring loaded and causes drift over time.
6When opening a repair order for an intermittent complaint, what should the technician do first?
A.Replace the component named by the driver
B.Verify the concern and review history
C.Erase all stored diagnostic information
D.Perform an unrestricted high-speed road test
Explanation: A routine diagnostic process begins by confirming the concern, clarifying operating conditions, reviewing service history, and preserving codes and freeze-frame data. That information defines a safe, efficient test plan and prevents unsupported parts replacement.
7On a hydraulic schematic, a circle with a solid triangle pointing inward at the shaft symbol typically represents which component?
A.A pump
B.A hydraulic motor
C.A pressure-relief valve
D.An accumulator
Explanation: In ISO hydraulic symbols, a circle with the energy-flow triangle pointing inward (toward the centre) represents a motor, which converts fluid energy into rotation. A pump uses the same circle but with the triangle pointing outward.
8What is the primary hazard a technician must guard against when servicing a multi-piece (split-rim) truck wheel assembly?
A.Steam release from a hot cooling system
B.Lock-ring separation during inflation
C.Refrigerant release from an open A/C line
D.Electrolyte spray from a damaged battery
Explanation: A multi-piece rim can eject a side or lock ring with lethal force if parts are mismatched, damaged, or not seated. Inspect compatible components, use a restraining device, clip-on chuck, sufficient hose and an in-line valve, and remain outside the trajectory during inflation.
9Which document gives a heavy-duty technician the manufacturer's specified torque sequence and values for cylinder head bolts?
A.The bill of lading
B.The OEM service manual
C.The WHMIS label
D.The vehicle registration
Explanation: The OEM service manual contains the manufacturer's torque values, tightening sequences, and torque-to-yield procedures required for safe and accurate assembly. Following these exactly prevents head-gasket failure and warpage.
10A technician welding near a vehicle's electronic control modules should first:
A.Follow OEM instructions to disconnect the battery ground and protect nearby modules
B.Increase the welder amperage
C.Leave the ignition switched on
D.Connect the welding ground far from the work area
Explanation: Before welding, follow the vehicle OEM procedure for protecting electronic systems. This normally includes isolating specified power sources or modules and placing the welding return clamp as close to the work as practical so current does not travel through bearings, wiring, or controllers.

About the Red Seal 310T Exam

The Red Seal Truck and Transport Mechanic (officially 310T; also called Truck and Transport Technician) services, diagnoses, and repairs heavy commercial trucks, trailers, and buses. The interprovincial (IP) exam is multiple-choice and requires 70% to pass, earning the Red Seal endorsement that provides labour mobility across Canada.

Exam sponsor: Employment and Social Development Canada / Red Seal Program (delivered by provincial and territorial apprenticeship authorities). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Multiple-choice, single-correct interprovincial (IP) Red Seal exam covering common occupational skills; diesel engines, fuel and emissions; electrical/electronic systems; drivetrains; air brakes, steering and suspension; and HVAC/hydraulics. 70% required to pass; this practice bank is 100 selected-response items

Time Limit

About 4 hours

Passing Score

70%

Exam / Certification Fees

Provincial Red Seal IP exam fee, typically ~$100-170 CAD (varies by province/territory)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

10%

Common Occupational Skills

Safety, WHMIS, lifting/hoisting and rigging, tools and fasteners, service information, lockout/tagout, and protecting electronics during welding

20%

Diesel Engines, Fuel & Emissions

Compression ignition, common-rail fuel systems, turbocharging and charge-air cooling, cooling systems, and EGR/DOC/DPF/SCR-DEF aftertreatment

18%

Electrical & Electronic Systems

Batteries, Ohm's law, voltage-drop and parasitic-draw testing, charging and starting systems, sensors, and J1939 CAN (SPN/FMI) diagnostics

16%

Drivetrains, Transmissions & Differentials

Clutches and clutch brakes, manual and automated manual transmissions, drivelines and U-joints, axle ratios, interaxle locks, fifth wheels, and two-speed axles

24%

Brakes (Air), Steering & Suspension

Air compressor/governor, air dryer, relay and tractor protection valves, spring brakes, S-cam brakes, slack adjusters and pushrod stroke, ABS, alignment, kingpins, bearings, tires, and air-ride suspension

12%

HVAC, Hydraulics & Diagnostics

Cab A/C and refrigerant recovery, heating, hydraulics and relief valves, power take-off, contamination control, and structured diagnostics and repair verification

Preparing for the Red Seal 310T Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: Multiple-choice, single-correct interprovincial (IP) Red Seal exam covering common occupational skills; diesel engines, fuel and emissions; electrical/electronic systems; drivetrains; air brakes, steering and suspension; and HVAC/hydraulics. 70% required to pass; this practice bank is 100 selected-response items
  • Time limit: About 4 hours
  • Exam / certification fees: Provincial Red Seal IP exam fee, typically ~$100-170 CAD (varies by province/territory) Official sources

Using Our Practice Resources

  • Work through all 135 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Red Seal 310T: Suggested Study Strategy

1Weight your study toward air brakes - they are the single largest area; know the compressor/governor cut-in and cut-out, spring brakes, slack adjusters, and pushrod stroke limits cold
2Understand the diesel aftertreatment chain end to end: EGR, DOC, DPF active/passive regeneration, and SCR with DEF (32.5% urea, 67.5% water)
3Practice J1939 diagnostics: know what SPN and FMI mean, the ~60-ohm terminating-resistor check, and reading codes with a scan tool
4Memorize key relationships: Ohm's law (I = V/R), series vs parallel battery wiring, and how axle ratio relates driveshaft turns to wheel turns
5Expect scenario questions - connect symptoms (smoke colour, brake pull, vibration) to root causes rather than memorizing isolated facts
6Complete all 100 practice questions and review every miss with the AI tutor before sitting the exam

Frequently Asked Questions

How many questions are on the Red Seal Truck and Transport Mechanic (310T) exam and how long is it?

The Red Seal interprovincial exam is multiple-choice (commonly cited at roughly 100 to 150 questions) and is typically written over about four hours. The exact number is set within the Red Seal Occupational Standard, and you need 70% to pass.

What score do I need to pass the Red Seal 310T exam?

You need 70% to pass the Red Seal Truck and Transport Mechanic interprovincial exam. Because air brakes, steering and suspension make up the largest share of questions, strong air-brake knowledge is essential to a passing score.

Is it called Truck and Transport Mechanic or Technician?

The official Red Seal trade name is Truck and Transport Mechanic, often shown as 310T (Ontario's trade code). Some provinces and job postings also use Truck and Transport Technician; both refer to the same Red Seal trade.

How much does the Red Seal 310T exam cost?

There is no single national fee. Provinces and territories set their own exam fees, which typically fall in the range of about $100 to $170 CAD, plus any provincial application or registration costs. Check your local apprenticeship authority for exact amounts.

What topics does the 310T exam cover?

It covers common occupational skills; diesel engines, fuel and emissions (including DPF/SCR aftertreatment); electrical and electronic systems with J1939 diagnostics; drivetrains, transmissions and differentials; air brakes, steering and suspension; and HVAC, hydraulics and diagnostics.

Is this free 310T practice as good as paid prep?

Our 100 practice questions cover the same content areas as the Red Seal Occupational Standard, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.