第 8 章，共 8 章11% 占考试比重

Auto and Shop Information

Auto and Shop Information tests knowledge of automobiles, tools, and shop practices. Questions cover engine components, automotive systems, common hand and power tools, and their uses. This subtest is not part of the AFQT but supports qualification for mechanical and maintenance military jobs. Familiarity with how engines work and what each tool does is the key to a strong score.

Engine Fundamentals

The internal combustion engine converts fuel into motion through a repeating cycle. Knowing its main parts and how they work together is essential.

Crankshaft converts motion
The crankshaft turns the pistons' up-and-down motion into rotating motion that drives the wheels.
Spark plug ignites fuel
The spark plug produces a spark that ignites the compressed fuel-air mixture in the cylinder.
Four-stroke cycle
The cycle runs intake, compression, power, then exhaust, with the power stroke following compression.
Camshaft controls valves
The camshaft opens and closes the intake and exhaust valves at the right times.

Automotive Systems

A vehicle relies on several systems working together, from cooling to braking to charging. Each has a clear purpose.

Cooling system
The radiator circulates coolant and releases heat to keep the engine from overheating.
Electrical system
The battery stores energy to start the engine, and the alternator recharges it while running.
Braking system
Brakes use friction, usually pads on discs, to slow and stop the vehicle.
Transmission
The transmission uses gears to transfer engine power to the wheels and match speed to conditions.

Hand and Power Tools

Shop work depends on choosing the right tool for the job. Recognizing common tools and their uses answers many questions.

Screwdrivers
A Phillips screwdriver fits a cross-shaped head, while a flat-blade fits a single straight slot.
Wrenches and torque
A torque wrench tightens bolts to a specific, measured tightness to avoid damage.
Measuring tools
A feeler gauge measures small gaps like a spark plug gap, and a level checks for horizontal.
Striking and cutting tools
A hammer drives nails, and a hacksaw with its fine-toothed blade cuts metal.

Shop Safety and Materials

Safe, correct shop practice protects the worker and the work. Understanding materials and fasteners supports good technique.

Use the correct tool
Matching the right tool to the task, such as a hammer for nails, prevents damage and injury.
Understand fasteners
Bolts, nuts, and screws hold parts together and require the proper driver or wrench.
Maintain fluids
Engine oil lubricates moving parts, reducing friction, wear, and heat.
Follow safety habits
Keeping a clean workspace and wearing protection reduces the risk of accidents.
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Mechanical Comprehension

Last updated: September 2026

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