Free Red Seal Automotive Service Technician Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Red Seal Automotive Service Technician Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A fluorescent lamp flickers while a technician checks a running accessory belt. Which visual effect can make the rotating pulley appear stationary?

   1. A.Parallax error
   2. B.Stroboscopic effectCorrect answer: B
   3. C.Optical refraction
   4. D.Lens distortion

   Explanation: The source states: "Replace any flickering fluorescent tubes - the "strobe" effect may make some moving parts appear stationary." The intermittent lighting can hide apparent motion. The technician must not interpret apparent stillness as proof that the pulley has stopped.

   Reference: CCOHS — Garages — General Requirements — What are some safety tips for the general layout of a garage?

2. 2A coolant-temperature display is accurate, but the engine takes unusually long to warm up. Which thermostat fault should the technician investigate?

   1. A.The thermostat remains openCorrect answer: A
   2. B.The thermostat remains closed
   3. C.The thermostat opens too late
   4. D.The thermostat closes too early

   Explanation: The source states: "Is the thermostat constantly open?" A thermostat held open allows radiator circulation during warm-up. A closed, late-opening or early-closing thermostat restricts that circulation and does not fit this under-temperature fault.

   Reference: HELLA — Cooling system check — Engine does not warm up

3. 3A technician is sorting retrieved powertrain DTCs before looking up their definitions. Which code requires a manufacturer-specific definition rather than a generic P0 definition?

   1. A.P0401
   2. B.P0100
   3. C.P1123Correct answer: C
   4. D.P0301

   Explanation: The manual states: "DTC’s that start with “P1” and some “P3” are Manufacturer specific codes and their code definitions vary with each vehicle manufacturer." P1123 begins P1. The other choices begin P0 and belong to the generic powertrain group. No universal meaning for P1123 is assumed.

   Reference: Innova — OBD2 scan tool manual — Code Retrieval Procedure

4. 4A two-joint driveshaft has no horizontal offset. To check whether unequal joint angles explain a vibration, which measurement is needed?

   1. A.The diameter of each component's bearing journal
   2. B.The slope of each component's shaft centrelineCorrect answer: B
   3. C.The circumference of each component's flange pilot
   4. D.The end clearance of each component's splined joint

   Explanation: The source states: "Measure the angles of each component in your drivetrain (driving member, driveshaft(s), driven member), then use this calculator to calculate the operating angle of each U-joint in your drivetrain." Operating angles come from component centreline slopes, not journal size, spline clearance or flange circumference.

   Reference: Spicer — Driveline Operating Angle Calculator — Basic Rules

5. 5A loaded accessory circuit has a large voltage drop across its ground eyelet. The eyelet is tight but oxidation is visible beneath it. Which fault best explains the reading?

   1. A.Excessive contact resistance at the supply fuse
   2. B.A low-resistance bypass across the load
   3. C.Excessive contact resistance at the groundCorrect answer: C
   4. D.Insufficient resistance in the load winding

   Explanation: The source states: "A formation of contact resistance can lead to voltage drops or leakage currents." Oxidation adds contact resistance at the measured ground joint. The other faults concern reduced load resistance or bypass paths and do not explain a localized drop across this eyelet.

   Reference: HELLA — Earth (31), Troubleshooting — Earth (31) — frequently neglected

6. 6An alignment diagnosis requires measuring the forward or rearward tilt of the steering axis as viewed from the side. Which alignment angle is being measured?

   1. A.CasterCorrect answer: A
   2. B.Steering-axis inclination
   3. C.Camber
   4. D.Toe

   Explanation: The source states: "caster is the forward or backward angle of the steering axis as viewed from the side of the car." Caster is the specified fore/aft steering-axis angle. Camber is wheel tilt viewed from the front, toe is viewed from above, and steering-axis inclination is the inward steering-axis tilt viewed from the front.

   Reference: Monroe — Importance of Alignment After Strut Replacement — Effects

7. 7A restraint controller can retain firing energy after the vehicle battery is disconnected. Which electronic component provides the reserve described in its power-down precautions?

   1. A.CapacitorCorrect answer: A
   2. B.Resistor
   3. C.Diode
   4. D.Inductor

   Explanation: HELLA lists: "Providing the power supply to the firing circuits using the capacitor, independently of the vehicle battery." The reserve capacitor can retain firing energy after battery disconnection. Inductors, resistors and diodes have other circuit functions, rather than this specified reserve role. Follow the prescribed shutdown and waiting procedure.

   Reference: HELLA — Car Airbag System SRS — Components — Airbag control unit

8. 8A hybrid's traction battery is available, but its auxiliary battery is not receiving the commanded charging voltage. Which conversion stage supplies low-voltage DC from the traction pack?

   1. A.AC-to-DC rectifier
   2. B.DC-to-AC inverter
   3. C.DC-to-DC converterCorrect answer: C
   4. D.AC-to-AC converter

   Explanation: The source states: "This device converts higher-voltage DC power from the traction battery pack to the lower-voltage DC power needed to run vehicle accessories and recharge the auxiliary battery." The specified charging path is DC-to-DC conversion. The other power-converter types change AC/DC form or AC characteristics rather than providing this DC step-down function.

   Reference: U.S. DOE AFDC — How Do Hybrid Electric Cars Work? — Key Components — DC/DC converter

9. 9A cleaner splashes into a technician's eye. While first aid is being arranged, which SDS section provides the product-specific first-aid instructions?

   1. A.Section 4Correct answer: A
   2. B.Section 6
   3. C.Section 8
   4. D.Section 5

   Explanation: The source states: "4 First-aid measures First-aid measures by route of exposure: Inhalation Skin contact Eye contact" Section 4 addresses eye exposure. Sections 5, 6 and 8 address fire fighting, accidental release, and exposure controls respectively; they are not the first-aid section.

   Reference: CCOHS — WHMIS — Safety Data Sheet — Required SDS headings, Section 4

10. 10Coolant is being lost, but the external leak is not visible with the engine cold. Which listed cooling-system instrument is intended to apply test pressure to help locate the leak?

    1. A.A diagnostic scan tool
    2. B.A coolant concentration tester
    3. C.A cooling-system pressure testerCorrect answer: C
    4. D.An infrared temperature gun

    Explanation: The source states: "cooling system and components are pressure tested to locate leaks and f aults" The pressure tester applies pressure to expose leaks. The other instruments measure temperature, coolant properties or electronic data rather than pressurizing the system.

    Reference: Red Seal Occupational Standard — Automotive Service Technician — B-4.01.08P, printed p. 49