Occupational Skills & Safety — Auto Service Technician (310S) Practice Questions

Free Occupational Skills & Safety practice questions

1. 1.A vehicle on a 2-post lift must have the arms positioned at:

   • A.Any point
   • B.Manufacturer-specified lift points to prevent frame/body damage✓
   • C.The bumpers
   • D.The axles always

   Why: Lift points vary by vehicle. Placing arms at incorrect points can crush rocker panels, bend frames, or cause the vehicle to fall. Check the service manual.

2. 2.Used engine oil is classified as:

   • A.Non-hazardous
   • B.Hazardous waste requiring proper storage, handling, and disposal✓
   • C.Regular garbage
   • D.Recyclable plastic

   Why: Used oil contains heavy metals, combustion byproducts, and carcinogens. Must be stored in approved containers and disposed through licensed waste oil recyclers.

3. 3.The OBD-II diagnostic port is located:

   • A.Under the hood
   • B.Within reach of the driver's seat, typically under the dashboard near the steering column✓
   • C.In the trunk
   • D.Under the car

   Why: Federal law mandates OBD-II DLC (Data Link Connector) be within reach of the driver, within 2 feet of the steering column center. 16-pin trapezoidal connector.

4. 4.A scan tool reads DTCs. What does DTC stand for?

   • A.Digital Torque Converter
   • B.Diagnostic Trouble Code✓
   • C.Data Transfer Connection
   • D.Drive Train Control

   Why: DTCs are standardized codes (P0xxx, B0xxx, C0xxx, U0xxx) stored when the PCM detects a fault. They guide diagnosis but don't identify the exact failed component.

5. 5.The firing order of an engine determines:

   • A.How fast it runs
   • B.The sequence in which cylinders fire for smooth operation and balanced crankshaft loading✓
   • C.The fuel type
   • D.The oil type

   Why: Firing order is designed for smooth power delivery and balanced crankshaft loads. Wrong firing order causes severe vibration, misfires, and potential engine damage.

6. 6.Metric bolt grade 10.9 has what tensile strength?

   • A.100 MPa
   • B.1000 MPa (10 × 100)✓
   • C.10.9 ft-lbs
   • D.109 PSI

   Why: Grade 10.9: first digit × 100 = UTS in MPa = 1000 MPa. 0.9 × 1000 = 900 MPa yield. Common for suspension and drivetrain fasteners.

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