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310T Truck & Transport Mechanic Practice Test: Free Quiz

Q: Can I sample practice questions before subscribing?

Yes. You can take the interactive 10-question readiness quiz directly on this page with no sign-up required, or download our free 30-question printable sample mock exam PDF with step-by-step answer explanations. A subscription unlocks all 1350 Truck & Transport Mechanic (310T) questions, spaced-repetition review, and AI tutoring.

Preparing for the Red Seal Truck & Transport Mechanic (310T) exam

The Red Seal (Interprovincial) Truck & Transport Mechanic (310T) exam tests everything a working mechanic needs: heavy truck diesel engines, air brake systems, electrical and multiplex networks, suspension, steering, and drivetrains. Trying to memorize a thousand questions the night before rarely sticks. Research on the Ebbinghaus forgetting curve shows that spaced review holds knowledge better than cramming.

Red Seal Pass gives you a smarter path: a focused set of new questions each day, automatic review of the ones you miss, and clear explanations so you learn why, not just what.

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📥 Free Printable 30-Question Truck & Transport Mechanic (310T) Mock Exam PDF

Download our 30-question sample mock exam PDF with complete step-by-step answer keys and a blueprint breakdown.

🎧 Listen: the 30 Truck & Transport Mechanic (310T) Questions, Read Aloud

The same 30 questions as the free PDF, each read aloud with a 5-second pause before the answer and explanation.

Red Seal Truck & Transport Mechanic (310T) 30 practice questions video

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Official Truck & Transport Mechanic (310T) exam blueprint

Published by red-seal.ca for the 135-question Interprovincial exam. These weightings decide how many questions you face in each area, so they decide where your study time belongs.

Major Work Activity	Questions	Share
MWA A: Common Occupational Skills	8	5.9%
MWA B: Services, diagnoses and repairs engines and supporting systems	21	15.6%
MWA C: Services, diagnoses and repairs air systems and brake systems	17	12.6%
MWA D: Services, diagnoses and repairs electrical and electronic systems	22	16.3%
MWA E: Services, diagnoses and repairs drive trains	17	12.6%
MWA F: Services, diagnoses and repairs steering, chassis/frames, suspensions, tires, wheels and hubs	18	13.3%
MWA G: Services, diagnoses and repairs cabs	5	3.7%
MWA H: Services, diagnoses and repairs trailers	8	5.9%
MWA I: Services, diagnoses and repairs climate control systems	7	5.2%
MWA J: Services, diagnoses and repairs hydraulic systems	8	5.9%
MWA K: Services, diagnoses and repairs hybrid and electric vehicles (EV)	4	3.0%
Total	135	100%

Exam time 4 hours · pass mark 70%. Source: red-seal.ca official exam breakdown.

10-Question Truck & Transport Mechanic (310T) Quick Readiness Quiz — with Full Worked Answers

No sign-up and no email required. Take this 5-minute diagnostic quiz to test your current exam readiness. Every answer below includes complete code citations and worked steps — the same standard as the other 1340 questions in the full bank.

⚡ Interactive Readiness Quiz

Click any option (A–D) below to test yourself & reveal the worked explanation.

Question 1 of 10

Late on a Friday at a fleet shop in Red Deer, a mechanic finds that a coolant hose on a parked tractor has split and about 20 litres of glycol coolant have spread across the bay floor, running toward the trench drain. Glycol is toxic to pets and wildlife and must not reach the storm or sanitary sewer. In what order should the mechanic deal with the spill?

A) Stop the leak at the source; read the SDS and put on the listed PPE; berm the drain and the edge of the spill; then absorb it and bag it as hazardous waste

B) Absorb it and bag it as hazardous waste; read the SDS and put on the listed PPE; berm the drain and the edge of the spill; then stop the leak at the source

C) Read the SDS and put on the listed PPE; absorb it and bag it as hazardous waste; stop the leak at the source; then berm the drain and the edge of the spill

D) Berm the drain and the edge of the spill; absorb it and bag it as hazardous waste; read the SDS and put on the listed PPE; then stop the leak at the source

Correct answer: A

The source is stopped first so the spill stops growing, then the SDS gives the PPE and cleanup method. The drain is protected before the absorbent goes down, and the used absorbent is bagged as hazardous waste. The other options use the same steps in the wrong order: B does 'absorb it and bag it as hazardous waste' before 'read the SDS and put on the listed PPE', C does 'absorb it and bag it as hazardous waste' before 'stop the leak at the source', and D does 'absorb it and bag it as hazardous waste' before 'read the SDS and put on the listed PPE'.

Question 2 of 10

A tractor at a fleet shop in Timmins loses power at high load and sets a low fuel rail pressure code, but only when the fuel tank is under a quarter full. The secondary fuel filter was changed last month. The engine maker gives a maximum suction restriction at the transfer pump inlet. Which test checks the supply side to the pump?

A) A compression test on all cylinders, to see whether the low pressure affects them

B) A vacuum gauge on the transfer pump inlet, read at full load and compared to the maximum

C) A pressure test of the cooling system, to rule out coolant in the fuel supply

D) A resistance check of the fuel temperature sensor, at a cold and hot reading

Correct answer: B

A restriction on the suction side, such as a collapsing hose, a plugged tank pickup screen or a primary filter, makes the transfer pump starve. A vacuum gauge at the pump inlet under load shows it against the maker's limit. Compression, coolant pressure and fuel temperature do not test the suction side.

Question 3 of 10

A tractor at a fleet shop in Lethbridge has a deep knock that is loudest under load once the engine is hot, and it quietens when the injector on cylinder 4 is cut out with the scan tool. Oil pressure is low at hot idle. A slap that is loudest cold and fades as the engine warms was ruled out. What does the knock point to?

A) A loose fan blade rubbing against the edge of the fan shroud

B) Piston slap from a worn piston skirt in cylinder 4

C) A worn connecting rod bearing on the number 4 cylinder

D) A sticking turbo wastegate flapping on the hot side of the turbo

Correct answer: C

A rod bearing knock is loudest under load and when hot, changes when that cylinder is cut out, and comes with low hot oil pressure. Piston slap is loudest cold and fades with heat. A fan rub is not load-related, and a wastegate does not quieten when an injector is cut.

Question 4 of 10

A tractor at a fleet shop in Halifax loses air overnight, but the shop is noisy and the mechanic cannot hear the leak behind the dash panels. Soap cannot reach every fitting without taking the dash apart. The shop has an ultrasonic leak detector. What does that tool do that suits this job?

A) It reads the ABS fault codes that show which fitting behind the dash is leaking

B) It measures the air pressure that shows which line behind the dash is leaking

C) It sprays a dye that shows which fitting behind the dash leaks under a black light

D) It hears the high-pitched sound of escaping air that ears miss in a noisy shop

Correct answer: D

Escaping air makes an ultrasonic sound that the detector picks up and converts to something the user can hear, even in a noisy shop. It leads the mechanic to the leak without stripping the dash. It does not read codes, measure line pressure or use dye.

Question 5 of 10

After a driver at a yard in Fort McMurray boosted a tractor with the cables on backwards, the truck started but the batteries no longer charge. The alternator's output fusible link is burned, and when it is replaced the alternator still puts out almost nothing. What has most likely been damaged?

A) The alternator's belt, from the slip during the boost

B) The alternator's rectifier diodes, from the reversed polarity

C) The starter's solenoid, from the heavy feed at start-up

D) The battery hold-downs, from the loosening during the boost

Correct answer: B

Reversed polarity drives large current through the rectifier diodes and burns the fusible link. Even with a new link, the damaged diodes mean the alternator is repaired or replaced. A belt, a solenoid or a hold-down does not explain a burned link and almost no output.

Question 6 of 10

A trailer at a fleet shop in Kitchener shows its ABS lamp after the power-up check, and a reader shows a code for the right rear wheel speed sensor circuit, open or shorted to ground. The other sensors read normally. What is the most appropriate first step?

A) Replace all the trailer's wheel speed sensors, then read the codes again

B) Replace the trailer ABS controller, then read the codes again

C) Inspect that sensor's wiring and connector, then measure its resistance

D) Clear the code and tow the trailer, then read the codes again

Correct answer: C

The code points to one sensor circuit. The sensor, harness and connector are inspected for damage or corrosion, and the sensor's resistance is measured before any part is replaced. The other sensors read normally, the controller is not indicated, and an open circuit does not clear on its own.

Question 7 of 10

A tractor with an automatic transmission at a dealership in Sault Ste. Marie makes a light knocking at idle that changes with engine speed. The noise is at the bell housing, and through the inspection cover the mechanic sees a crack running between the bolt holes of the flexplate that drives the converter. What should be done?

A) Weld the crack in the flexplate, and check the converter and crank mounting

B) Tighten the converter bolts more, and leave the cracked flexplate in place

C) Leave the flexplate as it is, and recheck the crack at the next PM service

D) Replace the flexplate and check the converter and crank mounting surfaces

Correct answer: D

A cracked flexplate knocks and can break apart, losing drive. It is replaced, and the cause, such as loose bolts or a misaligned converter, is checked at the converter and crankshaft mounting. Welding a thin drive plate is not a repair, and neither tightening nor waiting removes the crack.

Question 8 of 10

A fleet in Lethbridge reports that one of its tractors with rear air suspension rides with the frame tilted toward the left. Before anyone adjusts the height control valve linkage, the lead hand reminds the apprentice that the ride height must be measured under the conditions the truck maker specifies. How should the truck be set up for the ride height measurement?

A) On a level floor, unloaded or as the maker states, with full system air pressure

B) On the hoist with the axles hanging, unloaded, with full system air pressure

C) On a level floor, unloaded, with the air springs dumped onto the bump stops

D) On any surface right after a road test, unloaded, with full system air pressure

Correct answer: A

Ride height is only meaningful on a level surface, at the load the maker specifies and with the air system fully charged, so the height control valve has settled the springs at its set height. Hanging axles, dumped springs or an uneven surface all give a height that means nothing.

Question 9 of 10

A driver at a yard in Moncton finds the landing gear crank on a van trailer very stiff, and it jumps out of high gear under load. The gearbox has a grease fitting that is dry, and the gear legs are rusty. The trailer is ten years old. What should the mechanic do?

A) Spray the legs with water to clean them, then check the gearing

B) Hammer the crank handle free at its pin, then check the gearing

C) Fit a longer crank handle for more force, then check the gearing

D) Lubricate the gearbox and legs as directed, then check the gearing

Correct answer: D

Landing gear needs regular lubrication of its gearbox and legs. A dry gearbox binds and can jump gears, so it is lubricated as the maker directs and the gear engagement checked; worn parts are replaced. Water, a hammer and more force leave the dry gearbox as it is.

Question 10 of 10

A heater box on an older tractor at a shop in Lloydminster rattles and leaks air at a split seam. The doors and core inside are good, and the maker sells the box's seal kit and clips. The manual shows how to close it up, and the shop's quality sheet asks for proof that air now goes only where it should. What is the right repair?

A) Seal the seam with duct tape, then check airflow at each vent in each mode

B) Fit the kit's seals and clips, then release it with no check of the airflow

C) Fit the kit's seals and clips, then check airflow at each vent in each mode

D) Replace the core as well, then release it with no check of the airflow

Correct answer: C

The kit's parts repair the seam, and airflow at each vent in each mode proves the air goes where it should. Tape fails with heat and does not stop the rattle, and with no airflow check there is no proof. The core is already good.

310T Truck & Transport Mechanic Air Brakes, Diesel & Drivetrain Reference

Essential formulas, Canadian code standards, and critical numerical thresholds tested on the Interprovincial Red Seal Truck & Transport Mechanic (310T) exam:

Heavy Truck System	Specification or Formula	Critical Exam Value & Diagnostic Rule
Air Brake Governor Cut-In / Cut-Out	Cut-In: ~100 psi (690 kPa) \| Cut-Out: 120–135 psi (827–930 kPa)	Safety relief valve pops at 150 psi (1,034 kPa) if governor fails to unload
Low Air Pressure Warning & Tractor Protection	Low warning: ≥ 55–60 psi \| Spring brake pop-out: 20–45 psi	Applied air loss limit with engine off: max 3 psi/min (single) or 4 psi/min (combination)
S-Cam Pushrod Stroke & Slack Adjuster	Pushrod & slack adjuster must form 90° at half-stroke (applied)	Type 30 chamber clamp-type max legal stroke: 2 in. (long-stroke Type 30LS: 2.5 in.)
J1939 Multiplex CAN Bus Diagnostics	CAN-H + CAN-L = 5.0V \| Key-off resistance = 60 Ω	120 Ω reading indicates open backbone or one missing 120 Ω terminating resistor
Heavy Diesel Common Rail & Tier 4 SCR	Rail pressure: 30,000+ psi (2,000+ bar) \| DEF = 32.5% urea	High injector return flow indicates worn internal injector control valve (low rail pressure)
Driveline Phasing & Working Angles	U-joint yokes must be in phase; operating angles within 1° of each other	Equal and opposite working angles cancel torsional vibration across the driveshaft

Worked examples: air brake torque, CAN bus termination and starter voltage drop on the 310T exam

The 135-question blueprint is led by Services, diagnoses and repairs electrical and electronic systems (22 of 135 questions), Services, diagnoses and repairs engines and supporting systems (21 of 135 questions), Services, diagnoses and repairs steering, chassis/frames, suspensions, tires, wheels and hubs (18 of 135 questions) and Services, diagnoses and repairs air systems and brake systems (17 of 135 questions). Three core heavy-duty calculations:

Worked example 1

A Type 30 brake chamber (effective diaphragm area 30 in²) receives 100 psi of air pressure and pushes a 6.0-inch slack adjuster at 90°. What are the pushrod force and camshaft input torque?

Pushrod force = area × pressure = 30 in² × 100 psi = 3,000 lbf. Torque = force × slack length = 3,000 lbf × 6.0 in = 18,000 lb·in (1,500 lb·ft).

Answer: 3,000 lbf pushrod force; 18,000 lb·in (1,500 lb·ft) torque.

Worked example 2

An SAE J1939 CAN bus backbone has two 120 Ω terminating resistors wired in parallel at opposite ends of the harness. With battery power off, what resistance should you measure across CAN High and CAN Low, and what reading indicates one open terminator?

Two 120 Ω resistors in parallel: R = 120 ÷ 2 = 60 Ω. If one terminating resistor or backbone end opens, only a single resistor remains in circuit: 120 Ω.

Answer: 60 Ω normal; 120 Ω if one terminator is open.

Worked example 3

A heavy-duty 12 V starter motor draws 600 A while cranking. If the positive and negative cranking cables have a combined resistance of 0.0025 Ω, what is the total cable voltage drop?

V_drop = I × R = 600 A × 0.0025 Ω = 1.50 V.

Answer: 1.50 V drop across the cranking cables.

Maximum allowable pushrod stroke limits and air compressor build-up times must follow provincial Commercial Vehicle Inspection Program (CVIP) and NSC standards.

A 4-week study plan for the Truck & Transport Mechanic (310T) exam

18 new questions a day is the pace the platform sets, because spacing beats cramming. Over four weeks that is about 504 questions, and the order below follows the official weightings above.

Week 1 — the heaviest area. MWA D: Services, diagnoses and repairs electrical and electronic systems, which alone is 16.3% of the exam.
Week 2 — the next two. MWA B: Services, diagnoses and repairs engines and supporting systems (15.6%) and MWA F: Services, diagnoses and repairs steering, chassis/frames, suspensions, tires, wheels and hubs (13.3%).
Week 3 — the remaining activities, plus every question you got wrong. Wrong answers return automatically on day 1, 3 and 7.
Week 4 — full-length timed runs. 135 questions in 4 hours, then review every mistake by Major Work Activity.

Booking the Truck & Transport Mechanic (310T) exam where you live

Eligibility and booking are handled by your province, not by the Red Seal program itself. Start here:

The full question bank

1350 Truck & Transport Mechanic (310T) questions, every one explained

You have just completed the 10-Question Readiness Quiz for Truck & Transport Mechanic (310T). To keep preparing for your 135-question Red Seal exam, unlock the full 1350-question bank with automatic Spaced Repetition (Ebbinghaus) and an AI tutor that explains every missed question.

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Frequently asked questions

How many questions are on the Red Seal Truck & Transport Mechanic (310T) exam?

The Interprovincial Red Seal Truck & Transport Mechanic (310T) exam has 135 multiple-choice questions, a 4-hour limit and a 70% pass mark, per the official exam breakdown on red-seal.ca.

Can I sample practice questions before subscribing?

Yes. You can download a free 30-question sample mock exam PDF with full step-by-step answer explanations. A subscription unlocks all 1350 questions, spaced-repetition review, and AI tutoring.

What's the best way to study for the Red Seal exam?

Consistent daily practice beats cramming. Read our Founder's Exam Prep Journey Blog Series to see how daily spaced repetition works in practice.

What does a subscription cost?

We offer a 7-Day Pass ($9.99 CAD one-time), a Monthly Pass ($29.99 CAD/month), and a 3-Month Pass with Free-Until-You-Pass Guarantee ($69.99 CAD one-time). All plans include daily adaptive practice, spaced-repetition review, and AI Journeyperson Tutor coaching.

What extra practice comes with the 3-Month Pass?

The 3-Month Pass adds two study tools for Truck & Transport Mechanic (310T). Practice by Block lets you pick any Major Work Activity on the official blueprint and drill it 18 questions at a time. Exhibit Booklet Practice gives you 12 questions that make you read tables, catalogs, test records and a tractor dual air brake system diagram, with a worked explanation for every answer.