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Exam Review

Key Facts: Red Seal Truck and Transport Mechanic Exam

135

Official Exam Questions

Red Seal Program — current exam information

70%

Passing Score

Red Seal Program — exam preparation guide

4 hours

Writing Time

Red Seal Program — exam preparation guide

11

Exam Blocks

Red Seal Program — current exam information

310T

Ontario Trade Code

Skilled Trades Ontario

135

Practice Questions

OpenExamPrep practice-bank inventory

The Red Seal Truck and Transport Mechanic examination has 135 multiple-choice questions, a four-hour writing period and a 70% passing mark. Its 11 published blocks include trailers, cabs and hybrid/electric vehicles. Electrical and electronic systems is the largest block at 22 questions; engines and supporting systems follows at 21. Displayed percentages are rounded from the published counts. Ontario calls this trade Truck and Coach Technician (310T). Eligibility, fees and rewrites are administered by the provincial or territorial authority. This independent OpenExamPrep resource contains a separate 135-question practice bank.

Sample Red Seal Truck and Transport Mechanic Practice Questions

Try these sample questions to review concepts for the Red Seal Truck and Transport Mechanic 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 Truck and Transport Mechanic Exam

Truck and Transport Mechanic is the national Red Seal trade for servicing, diagnosing and repairing commercial trucks, buses and related transport systems, including trailers. Ontario uses the title Truck and Coach Technician and code 310T. Provincial and territorial authorities determine eligibility and deliver the interprovincial examination.

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

135 multiple-choice questions across 11 blocks (A–K): common occupational skills; engines and supporting systems; air and brake systems; electrical and electronic systems; drive trains; steering, chassis, suspension and wheels; cabs; trailers; climate control; hydraulic systems; and hybrid/electric vehicles. Four options and one correct answer per question; 70% required to pass.

Time Limit

4 hours

Passing Score

70%

Exam / Certification Fees

Set by the provincial or territorial authority; check its current examination fee

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.

5.93%

A: Common Occupational Skills

8 of 135 exam questions. Safety, tools and equipment, routine trade activities, communication and mentoring. Percentage rounded from the published question count.

15.56%

B: Engines and Supporting Systems

21 of 135 exam questions. Base engines, lubrication, intake, exhaust, engine management, fuel, retarders and cooling. Percentage rounded from the published question count.

12.59%

C: Air and Brake Systems

17 of 135 exam questions. Air supply and control, foundation brakes, spring brakes and brake diagnostics. Percentage rounded from the published question count.

16.30%

D: Electrical and Electronic Systems

22 of 135 exam questions. Batteries, charging, spark ignition, starting, electrical components and vehicle management. Percentage rounded from the published question count.

12.59%

E: Drive Trains

17 of 135 exam questions. Clutches, manual and automatic transmissions, automated transmissions, drivelines, axles and retarders. Percentage rounded from the published question count.

13.33%

F: Steering, Chassis, Suspension and Wheels

18 of 135 exam questions. Steering, frames, suspension, hitches and couplers, tires, wheels and hubs. Percentage rounded from the published question count.

3.70%

G: Cabs

5 of 135 exam questions. Interior and exterior cab components. Percentage rounded from the published question count.

5.93%

H: Trailers

8 of 135 exam questions. Trailer components and refrigeration systems. Percentage rounded from the published question count.

5.19%

I: Climate Control

7 of 135 exam questions. Heating and air conditioning. Percentage rounded from the published question count.

5.93%

J: Hydraulic Systems

8 of 135 exam questions. Hydraulic supply, controls, actuators and diagnostics. Percentage rounded from the published question count.

2.96%

K: Hybrid and Electric Vehicles

4 of 135 exam questions. Hybrid vehicle and electric vehicle systems. Percentage rounded from the published question count.

Preparing for the Red Seal Truck and Transport Mechanic Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 135 multiple-choice questions across 11 blocks (A–K): common occupational skills; engines and supporting systems; air and brake systems; electrical and electronic systems; drive trains; steering, chassis, suspension and wheels; cabs; trailers; climate control; hydraulic systems; and hybrid/electric vehicles. Four options and one correct answer per question; 70% required to pass.
  • Time limit: 4 hours
  • Exam / certification fees: Set by the provincial or territorial authority; check its current examination fee 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 Truck and Transport Mechanic: Suggested Study Strategy

1Prioritize electrical/electronic diagnostics (22 questions) and engines/supporting systems (21), while reviewing all 11 published exam blocks
2Distinguish soot regeneration from DPF ash cleaning; connect aftertreatment symptoms to specified diagnostic tests
3Practice loaded voltage-drop and network diagnosis; apply the circuit-specific wiring diagram and test conditions
4Recompute Ohm's law, electrical power, axle ratios and hydraulic force with consistent units
5Use manufacturer procedures and safe energy isolation for air brakes, hydraulics, refrigeration and high-voltage systems
6Complete the separate 135-question practice bank and review each missed concept against the appropriate service information

Frequently Asked Questions

How many questions are on the Truck and Transport Mechanic Red Seal exam?

The current Red Seal exam-information page lists 135 multiple-choice questions. Each question has four options and one correct answer. OpenExamPrep separately provides a 135-question practice bank; its inventory is not evidence of the official exam count.

What are the passing score and time limit?

The Red Seal Program specifies a 70% passing mark and four hours of writing time. Confirm your approved appointment and accommodation arrangements with your provincial or territorial authority.

Is Truck and Coach Technician 310T the national trade name?

310T is Ontario's code for Truck and Coach Technician. The national Red Seal trade is Truck and Transport Mechanic; provincial and territorial titles can differ.

How much does the Truck and Transport Mechanic Red Seal exam cost?

Your provincial or territorial authority sets examination and application fees. Check that authority's current fee schedule; there is no single national examination fee.

What topics does the exam cover?

The 11 blocks are common occupational skills; engines and supporting systems; air and brake systems; electrical and electronic systems; drive trains; steering, chassis, suspension and wheels; cabs; trailers; climate control; hydraulic systems; and hybrid/electric vehicles.

What does this free practice resource contain?

The current OpenExamPrep practice bank has 135 questions with explanations. It is independent exam preparation. Use it to identify study gaps, then consult the occupational standard and current manufacturer service information.