Auto Information (AI)
Auto Information is an ASVAB subtest that tests knowledge of automotive systems including engines, transmissions, brakes, electrical systems, and basic vehicle maintenance and repair.
Exam Tip
Auto Information is separate on CAT-ASVAB but combined with Shop Information on paper ASVAB. Know the four-stroke cycle, basic electrical systems, and brake types. NOT part of AFQT.
What is the Auto Information Subtest?
Auto Information (AI) is an ASVAB subtest that measures your knowledge of automobile technology, including how vehicle systems work, common repair procedures, and basic automotive terminology.
Subtest Details
| Feature | CAT-ASVAB | Paper ASVAB |
|---|---|---|
| Questions | 10 | Combined with Shop (25 total AS) |
| Time | 7 minutes | 11 minutes (combined) |
| Format | Separate subtest | Combined as Auto & Shop (AS) |
Topics Covered
| System | Key Topics |
|---|---|
| Engine | Four-stroke cycle, cylinders, pistons, crankshaft |
| Fuel System | Fuel injection, combustion, octane ratings |
| Cooling System | Radiator, thermostat, coolant, water pump |
| Electrical System | Battery, alternator, starter, ignition |
| Transmission | Manual vs. automatic, gear ratios, clutch |
| Brakes | Disc vs. drum, hydraulic system, ABS |
| Exhaust | Catalytic converter, muffler, emissions |
| Suspension & Steering | Shocks, struts, power steering |
AI in Line Scores
| Composite Score | Uses AI? |
|---|---|
| MM (Mechanical Maintenance) | Yes |
| GM (General Maintenance) | Yes |
| AFQT | No |
Study Tips
- Learn the four-stroke engine cycle (intake, compression, power, exhaust)
- Understand basic electrical circuits in vehicles
- Know the difference between disc and drum brakes
- Study common dashboard warning indicators
- Practice identifying engine components and their functions
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Related Terms
Armed Services Vocational Aptitude Battery (ASVAB)
The ASVAB is a multiple-aptitude test administered by the U.S. Department of Defense to determine qualification for military enlistment and job placement across all branches. It consists of 10 subtests covering verbal, math, science, and technical domains.
Shop Information (SI)
Shop Information is an ASVAB subtest that tests knowledge of tools, shop practices, woodworking, metalworking, and building materials. On the CAT-ASVAB it is a separate subtest; on the paper version it is combined with Auto Information as Auto & Shop (AS).
Mechanical Comprehension (MC)
Mechanical Comprehension is an ASVAB subtest that tests understanding of basic mechanical and physical principles, including simple machines, force, energy, fluid dynamics, and structural support concepts.
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