Five free practice questions on safety, tools and shop skills: block A of the Red Seal 310S Automotive Service Technician exam, about 9 of its 125 questions. They are in the exam's format: four options, one correct answer. Answer each one before opening the explanation. No account, no email.
01The questions
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A section of flexible fuel hose on a port-injected engine must be replaced. The system runs at about 400 kPa (58 psi). Which hose and clamp are correct?
- SAE 30R7 carburettor fuel hose with a worm-drive clamp
- Reinforced heater hose, since it is rated for 400 kPa
- Silicone vacuum hose doubled up with two spring clamps
- SAE 30R9 fuel-injection hose with FI-style clamps
Show the answer
D. Correct. 30R9 is rated for fuel-injection pressures and modern fuel blends with low permeation, and rolled-edge fuel-injection clamps grip evenly without cutting the hose. Where the OEM uses quick-connect or crimped fittings, replace with the same. High-pressure GDI lines are rigid OEM parts, not hose.
Why not the others
A. 30R7 hose is rated for low-pressure carburettor and return lines and permeates more fuel vapour. A worm-drive clamp cuts into hose under pressure. Neither belongs on an injection feed line.
B. Heater hose is EPDM rubber for coolant; gasoline softens and swells it and it fails quickly. Pressure rating alone does not make a hose fuel-compatible.
C. Silicone is not fuel-resistant and vacuum hose has no reinforcement for pressure. Doubling it up does not change either fact.
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An apprentice is about to grind a weld with an angle grinder wearing a face shield but no safety glasses. The mentor stops the job. Why?
- A face shield is secondary; CSA-rated safety glasses go under it
- Face shields are only for chemical splash work
- A face shield alone traps sparks against the face
- The grinder must be used with a welding helmet instead
Show the answer
A. Correct. Under CSA Z94.3 a face shield is secondary protection worn over primary eye protection (safety glasses or goggles) because debris can come around or under it. Grinding also needs the wheel guard fitted, a wheel rated above the grinder's rpm, hearing protection and no loose clothing.
Why not the others
B. Face shields are used for grinding, chipping and splash work alike; the shield is appropriate here. It just cannot be the only eye protection.
C. Sparks do not get trapped by a shield; the real problem is what gets past it. A shield is open at the sides and bottom.
D. A welding helmet is for arc radiation, not grinding debris, and most have too dark a lens for grinding. Safety glasses plus a face shield is the correct combination.
-
An apprentice has torqued a set of wheel nuts to 90 N·m (66 ft-lb) instead of the specified 140 N·m (103 ft-lb). The mentor notices while the customer is at the counter. Which feedback approach is most effective?
- Wait for the monthly review and mention it then
- Take the apprentice aside promptly, show the spec, and have them re-torque
- Say nothing, re-torque the wheels yourself and move on
- Point out the error loudly at the counter so the whole shop learns
Show the answer
B. Correct. Effective feedback is timely, private, specific and constructive: ask what happened, show where the spec comes from, have them do it correctly and confirm it. Because it is safety-critical, it is done now, not later. Balance correction with recognition of what they did well.
Why not the others
A. Delayed feedback loses its connection to the event and, on a safety item, is unacceptable. Wheels leaving under-torqued is an immediate problem.
C. Fixing it silently leaves the apprentice with the same wrong habit and the next set of wheels at risk. Corrective feedback has to be given.
D. Public correction humiliates the apprentice, alarms the customer and teaches nothing but fear. Feedback is given privately.
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A front-wheel-drive car is on a two-post hoist and the technician is about to remove the engine and transaxle from below. What additional step is needed before the powertrain is lowered out?
- Move the rear arm pads forward so the pads take more weight
- Raise the hoist to full height so the transmission jack fits underneath
- Secure the vehicle to the arms or add tall stands, since the balance point will shift
- None extra; the arm restraints keep the vehicle from moving
Show the answer
C. Correct. Removing the powertrain moves the centre of gravity rearward and can tip the vehicle off the front pads. Hoist and vehicle manufacturers call for tall safety stands under the rear (or hold-down straps to the arms) before removing or installing heavy components, and for re-checking pad position afterwards.
Why not the others
A. Pads belong only at the manufacturer's lift points. Moving them to unreinforced floor is more dangerous than the problem it is meant to solve.
B. Height is a practical matter, not a safety measure. The vehicle can tip at any height once the weight distribution changes.
D. Arm restraints stop the arms swinging; they do nothing about the vehicle's balance on the pads. Once 200 kg (440 lb) comes out of the front, the balance point moves.
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A technician has removed the service disconnect from a hybrid, waited the specified time, and is about to unbolt the inverter cover. Which check proves the high-voltage system is safe to touch?
- A proven CAT III meter reads near 0 V at the HV terminals
- The dash shows READY off and no warning lamps
- The 12 V battery negative cable has been disconnected
- The orange cables feel cool to the touch through the gloves
Show the answer
A. Correct. Use the live-dead-live method: prove the CAT III meter and leads on a known live source, measure between the HV positive and negative terminals and each to chassis and confirm the reading is at or below the OEM's threshold, then prove the meter again. Only then is the system verified de-energised.
Why not the others
B. Dash indications show the vehicle's state, not the absence of stored energy at the terminals. Only a measurement proves the circuit is dead.
C. Removing 12 V power drops the contactors on most vehicles but does not discharge the inverter capacitors or prove isolation. It is one step, not the proof.
D. Temperature says nothing about voltage — a fully charged capacitor bank is at room temperature. Touching HV cabling to 'test' it is exactly what the procedure exists to prevent.
02Answer key
| Question | Answer | Sub-task |
|---|---|---|
| Q1 | D | Uses fasteners, tubing, hoses and fittings |
| Q2 | A | Uses personal protective equipment (PPE) and safety equipment |
| Q3 | B | Uses mentoring techniques |
| Q4 | C | Uses hoisting and lifting equipment |
| Q5 | A | Implements specific safety protocols for hybrid and electric vehicles (EV) |
03What block A covers
This block covers the shop skills every other task relies on. It includes WHMIS and safety data sheets, PPE, hoists, jack stands and engine cranes, high-voltage safety on hybrids and EVs, torque wrenches and micrometers, fastener grades, torque-to-yield bolts, brake line flares, scan tools and module programming, service information, VINs and work orders, and mentoring apprentices.
The Red Seal Occupational Standard names this block “Performs common occupational skills”. It carries 7.2% of the exam, about 9 of the 125 questions, split across three tasks. The share column is each task's weight within the block, as the standard publishes it.
| Task and its sub-tasks | Share of block |
|---|---|
| Performs safety-related functions Maintains safe work environment; Uses personal protective equipment (PPE) and safety equipment; Implements specific safety protocols for hybrid and electric vehicles (EV) | 42% |
| Uses tools, equipment and documentation Uses tools and equipment; Uses fasteners, tubing, hoses and fittings; Uses hoisting and lifting equipment; Uses electronic service tools and systems for diagnostics and programming; Uses documentation and technical information | 50% |
| Uses communication and mentoring techniques Uses communication techniques; Uses mentoring techniques | 8% |
04What the questions turn on
Proving high voltage is off
Pulling the service disconnect and waiting is not proof. Prove a CAT III meter on a live source, measure across the HV terminals and to chassis, then prove the meter again. Full voltage after the wait means isolation has failed, so stop.
Jacks, stands and hoists
A jack lifts and a stand supports. On a two-post hoist, stop once the tires clear the floor and shake-test; any rocking or pad slip means lowering fully and resetting the arms. Lower onto the mechanical locks before walking under.
Torque depends on thread condition
A torque spec assumes the thread condition it states. Oiling a bolt specified dry turns more of the torque into stretch and can take it past yield. Torque-to-yield bolts are replaced, torqued, then turned through each angle step with a gauge.
Reading scan data
Fuel trims strongly positive at idle but near zero at cruise point to an unmetered air leak, because a fixed leak matters less as airflow rises. A coolant temperature reading stuck at -40 °C points to an open sensor circuit.
05The other blocks
The 310S exam has eight blocks. Each has its own page of free questions:
The 310S Automotive Service Technician practice exam page describes the full question bank. How these questions are written and checked: how our questions are made. Found a mistake? Tell us and we will fix it.