Automotive Service Technician · Red Seal 310S
Five 310S practice test questions, answers included.
Five questions from five different work activities — recall, procedural and critical-thinking, the way the exam is built. Pick an answer, then open the explanation. Every question in the bank explains all four options, not just the right one.
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55 free 310S questions in all
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The driver's power mirror moves up and down but not left and right. The passenger mirror works in all four directions from the same switch. Which is the most likely fault?
- The fuse for the mirror circuit
- The left/right contact in the mirror control switch
- The horizontal motor in the driver's mirror or its wiring
- The shared ground for both mirror assemblies
Show the answer
C. Correct. The switch's left/right contacts are shared by both mirrors and they work the passenger side, so they are good, and up/down working proves the driver mirror's feed and common circuit. What is left is the driver mirror's horizontal motor and the wire feeding it (less often, the selector contact for that one circuit), so test for voltage at the mirror connector when left/right is pressed with the driver side selected.
Source: Red Seal Occupational Standard, sub-task G-20.03
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A technician is about to remove the drums on an older vehicle to diagnose a rear brake noise. Which method should be used to deal with the brake dust inside?
- Wet it down and wipe it, or use a HEPA vacuum enclosure
- Blow it out with low-pressure air while wearing a dust mask
- Brush it into a container while wearing a dust mask
- Vacuum it out with a standard shop vacuum before inspection
Show the answer
A. Correct. Airborne brake dust is a health hazard. Wet methods (aerosol brake cleaner or a water/detergent spray, then wipe and dispose of the rags properly) or a HEPA-filtered vacuum with an enclosure keep the dust out of the air. Follow the shop's WHMIS/OH&S procedures.
Source: Red Seal Occupational Standard, sub-task F-18.02
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Why do hybrid and EV high voltage electric A/C compressors require the manufacturer's specified polyol ester (POE) oil rather than the PAG oil used in belt-driven compressors?
- POE oil is a much better electrical insulator
- POE oil is thinner and lubricates the scroll better at high speed
- PAG oil is incompatible with R-1234yf
- POE oil is cheaper and biodegradable
Show the answer
A. Correct. The compressor's HV motor windings sit in the refrigerant and oil, so the oil must not conduct. PAG oil is hygroscopic and electrically conductive enough to lower insulation resistance and trigger an isolation fault, and it can damage the compressor. Only the specified POE (or manufacturer-branded equivalent) may be used, in the specified quantity.
Source: Red Seal Occupational Standard, sub-task H-22.04
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A 15 A fuse for the accessory circuit blows again immediately after replacement. What is the correct next step to locate the fault?
- Install a 20 A fuse and see whether it holds
- Substitute a circuit breaker or short-finder and trace the harness
- Clean the fuse-box terminals for corrosion and fit another 15 A fuse
- Replace the accessory switch, because switches are the most common cause
Show the answer
B. Correct. A circuit breaker (or a short-finder tool) lets the circuit cycle without destroying fuses while you disconnect loads and connectors one at a time, or follow the tool's inductive pickup along the harness, to isolate the short to ground.
Source: Red Seal Occupational Standard, sub-task E-14.01
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A cylinder head is being reinstalled with torque-to-yield (TTY) head bolts. Which practice is correct?
- Reuse the original bolts if the threads look good, in three equal steps
- Torque all bolts to the final value in one pass, then re-torque after warm-up
- Tighten from the outer bolts toward the centre to seat the gasket edges first
- New bolts, specified sequence, torque plus angle
Show the answer
D. Correct. TTY bolts are single-use. Tighten in the manufacturer's sequence — normally from the centre outward — to the initial torque, then the specified extra angle(s) with an angle gauge. Check head and block flatness (often 0.05 mm limit) and clean the bolt holes first; oil or debris in a blind hole changes the clamp load.
Source: Red Seal Occupational Standard, sub-task B-5.03
Want ten more with every option explained? Free 310S practice questions — no account, no email, printable. With five more on each exam block page below, that makes 55 free 310S questions in all.
The 310S exam at a glance
How many questions are on the 310S Red Seal exam?
The Red Seal Automotive Service Technician (310S) exam has 125 multiple-choice questions, a 4-hour writing time and a 70% pass mark, spread across eight major work activities. Most questions are critical-thinking or procedural; only a small share is straight recall. Sources: the Red Seal Program's exam information page and Exam Preparation Guide, checked October 21, 2026.
Question mix — weighted to the blueprint
Only a small slice of the 310S exam asks you to name a part. The rest asks you to diagnose a fault, follow a procedure, and reason to a cause — which is exactly where recall-only question banks leave you exposed.
The full 310S practice exam
Know your Red Seal score before exam day.
Free, Red Seal–style practice for the 310S Automotive Service Technician certification. Every test is weighted to the official exam blueprint — heavy on diagnostics and critical thinking — so your score shows where you stand on each part of the exam.
What the 310S covers
Eight major work activities.
The occupational standard groups the trade into eight major work activities, 23 tasks and 96 sub-tasks. The question counts below are the official blueprint weightings — our 550-question bank is built to that same map, with every sub-task covered.
- A
Common occupational skills · 9 questions
Safety-related functions, tools, equipment and service documentation, communication and mentoring. Free block A questions: safety, tools and shop skills →
- B
Engine and engine support systems · 22 questions
Diagnosing and repairing engine mechanical systems and the support systems for gasoline and diesel engines: fuel, ignition, air induction, exhaust, emissions, cooling and lubrication. Free block B questions: engine, fuel and emission systems →
- C
Vehicle module communications systems · 12 questions
Diagnosing and repairing vehicle networking: modules, bus systems, scan-tool and network diagnosis. Free block C questions: CAN bus networks and module programming →
- D
Driveline systems · 17 questions
Clutches, manual and automatic transmissions, transfer cases, drive axles and driveline diagnosis and repair. Free block D questions: driveline and transmissions →
- E
Electrical and comfort control systems · 23 questions
Batteries, charging and starting, wiring and body electrical, plus HVAC and comfort control diagnosis and repair. Free block E questions: electrical and HVAC systems →
- F
Steering, suspension, braking, control systems, tires, hubs and wheel bearings · 23 questions
Steering, suspension and alignment, hydraulic and electronic brakes, ABS and control systems, tires, wheels, hubs and bearings. Free block F questions: brakes, steering and suspension →
- G
Restraint systems, body, accessories and trim · 10 questions
Airbags and seat belts, body components, accessories and trim diagnosis and repair. Free block G questions: airbags, body and trim →
- H
Hybrid and electric vehicle systems · 9 questions
High-voltage safety, hybrid drivetrains and EV diagnosis and repair — a small block today and a growing one. Free block H questions: hybrid and EV systems →
Where our numbers come from
Built to the published standard.
The question counts above are the Red Seal Program's own exam breakdown for Automotive Service Technician, and every question in our 550-question bank is mapped to a sub-task of the Red Seal Occupational Standard — 23 tasks and 96 sub-tasks, each one covered. When the standard is revised, we re-check the map and the weightings against it. For what each block covers and where to spend your study time, read the 310S exam guide. Read how our questions are made.
Tools for this exam: the free engine displacement calculator, no account needed.
Edited by Trevor Mulder · Last checked against the Red Seal Program's published exam information.
Why practice scores mislead
You can ace recall and still fail the 310S.
Most question banks drill what you can recall, because recall questions are cheap to write. The 310S is the opposite — mostly procedural and critical-thinking questions that ask you to work a fault through to a cause. That gap is why people walk in confident and walk out surprised. TicketPrep weights every test to the published blueprint, so a weak section here is a weak section there.
How TicketPrep prepares you
Built like a study tool, not a quiz app.
Weighted to the blueprint
Every test matches the published 310S weightings — heavy on the diagnostic questions the published exam breakdown calls for.
Every answer explained
Learn why the right answer is right — and why each of the other three is wrong. That's where the learning happens.
Timed mock exams
Full-length tests that match the real 125-question count and 4-hour limit, so exam day feels familiar.
Know your weak areas
Your score broken out by work activity, so you always know which systems to drill next.
310S questions
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