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Updated July 2026 with official ASVAB sources

ASVAB Automotive Information Practice Test: 171 Questions

Use this original ASVAB Automotive Information practice test to build automobile technology knowledge from zero. Official ASVAB sources call this subtest Auto Information, abbreviated AI, and describe it as knowledge of automobile technology. This page turns that public scope into a beginner study path, official timing context, 171 original questions, answer explanations, and internal links to the ASVAB score and study cluster.

ASVAB Study Guide ASVAB Score Guide ASVAB Score Calculator AFQT Score Calculator Electronics Information Practice Scores by Military Branch General Science Practice

Official Auto Information Scope

Auto Information, abbreviated AI, is the ASVAB Science/Technical-domain subtest for automobile technology. Official ASVAB materials describe AI as knowledge of automobile technology. That public description is broad, so this page does not pretend that the official program publishes a detailed classroom syllabus for students. Instead, it separates official facts from original practice: the official sources define the subtest name, purpose, timing, sample-question style, test-day context, and score relationship; this page supplies original study questions that practice the underlying automobile concepts.

For a beginner, automobile technology is easier to learn as connected systems rather than random part names. A vehicle needs an engine to create power, a fuel and air system to feed combustion, an ignition or compression process to start combustion, cooling and lubrication systems to control heat and friction, an electrical system to start and charge, a drivetrain to move torque to the wheels, brakes to slow the vehicle, steering and suspension to control direction and ride, tires to contact the road, and maintenance procedures to keep the systems safe. These are study buckets, not official ASVAB sub-scores.

Original practice notice: These 171 questions are original NUM8ERS study questions. They are not real ASVAB test questions, not leaked questions, and not copied from official sample items. Use them to build automobile vocabulary, system logic, and troubleshooting recognition before taking official ASVAB guidance from your recruiter, school counselor, or testing site.

Timing and Test-Day Context

Official CAT-ASVAB information lists Auto Information as 10 scored questions with a 7-minute time limit when no tryout questions are present. The same official CAT-ASVAB table notes that tryout questions may be included and that time limits can be longer when tryouts appear. The official 2025 ASVAB fact sheet lists the paper-and-pencil Auto and Shop Information section as 25 questions in 11 minutes. On CAT-ASVAB, AI and SI are administered as separate tests; official fact-sheet language also notes that scores are reported as a combined Auto and Shop score labeled AS. On P&P-ASVAB, AI and SI are combined into one AS test. This practice page is longer than the real subtest because it is built for learning, not for imitating the official item count.

Version Official AI timing context Practice implication
CAT-ASVAB 10 scored Auto Information questions; 7 minutes without tryout questions. After learning the systems, practice short 10-question sets in about 7 minutes.
CAT-ASVAB with possible tryouts Official CAT information lists possible tryout questions and a longer time limit when present. Do not judge the real test only by item count; answer each automotive item carefully.
P&P-ASVAB Auto and Shop Information are listed together as 25 questions in 11 minutes on the official 2025 fact sheet. Build fast recognition for both vehicle terms and shop/tool vocabulary if you expect a paper form.

Auto Information is not part of the AFQT calculation. Official ASVAB score guidance says the AFQT uses Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge, and Paragraph Comprehension. AI can still matter because ASVAB subtests are also used in Service composites for job classification. Use this page for automotive practice, the ASVAB Study Guide for the complete exam process, and the score pages after you have official score information.

How to Use This Practice Test

If you know nothing about cars, do not start by memorizing every part under the hood. Start with the job each system performs. The engine turns fuel energy into mechanical motion. The cooling system removes excess heat. The lubrication system reduces friction. The starting system cranks the engine. The charging system keeps the battery charged while the engine runs. The transmission changes torque and speed. The brakes turn motion into heat so the vehicle slows. If you can state the job of a system in plain language, part names become easier to remember.

  1. Read the beginner review before answering the first 30 questions.
  2. Work questions 1-40 slowly and open every explanation, even when you are correct.
  3. For every missed question, mark the system: engine, fuel, ignition, cooling, lubrication, electrical, drivetrain, brakes, steering, suspension, tires, tools, safety, or maintenance.
  4. Retake only the missed questions after 24 hours without looking at the explanations.
  5. Once your accuracy is above 80 percent, take 10-question timed sets in about 7 minutes.
  6. Use the ASVAB Electronics Information Practice Test when batteries, fuses, relays, charging systems, or circuit vocabulary slow you down.

Beginner Automotive Review

A vehicle is a set of systems working together. The engine creates turning force, called torque. The transmission changes the relationship between engine speed and wheel speed. The driveshaft, axle shafts, or half shafts carry torque toward the wheels. The brakes slow the vehicle. The steering system points the front wheels or steered wheels. The suspension keeps tires in contact with the road while supporting the vehicle. Electrical systems provide starting power, charging, lighting, sensors, and control signals.

Engine Basics

Most gasoline automotive engines use the four-stroke cycle: intake, compression, power, and exhaust. During intake, the engine draws in an air-fuel mixture. During compression, the piston squeezes that mixture. During the power stroke, combustion pushes the piston down. During exhaust, burned gases leave the cylinder. A crankshaft changes piston motion into rotation. A camshaft opens and closes valves at the correct time. A timing belt or timing chain keeps the crankshaft and camshaft synchronized.

Displacement describes the total volume swept by the pistons. A cylinder is the round chamber where a piston moves. The bore is the cylinder diameter, and the stroke is how far the piston travels. Compression ratio compares cylinder volume before and after compression. Engine oil lubricates moving parts, reduces friction, helps carry heat, and can help clean internal surfaces. A low oil level, wrong oil viscosity, or failed oil pump can damage an engine quickly because metal parts need a protective oil film.

Fuel, Air, Ignition, and Exhaust

A gasoline engine needs the correct mixture of air, fuel, compression, and spark. The air filter keeps dirt out of the engine. A fuel pump moves fuel from the tank toward the engine. Fuel injectors spray measured fuel. A spark plug ignites the compressed mixture in a gasoline engine. Diesel engines normally use heat from compression instead of spark plugs for combustion. The exhaust system carries burned gases away, reduces noise with a muffler, and can reduce emissions with a catalytic converter.

Troubleshooting often starts with the basic question: what is missing? If an engine cranks but does not start, it may be missing fuel, spark, compression, or correct timing. If an engine overheats, look at coolant level, radiator airflow, thermostat function, water pump operation, and leaks. If a vehicle lacks power, possibilities include restricted air flow, fuel delivery problems, ignition misfire, transmission issues, or exhaust restriction. The ASVAB is not a technician certification exam, but it rewards basic system understanding.

Cooling and Lubrication

The cooling system controls engine temperature. Coolant absorbs heat from the engine and carries it to the radiator. The radiator releases heat to the air. A water pump circulates coolant. A thermostat helps the engine warm up and then regulates coolant flow. A radiator cap helps maintain system pressure, which raises the boiling point of coolant. The fan increases airflow when vehicle speed or natural airflow is not enough. Never remove a hot radiator cap casually because hot pressurized coolant can cause severe burns.

The lubrication system protects moving parts. Oil is stored in the oil pan, drawn by the oil pump, cleaned by the oil filter, and distributed through passages to bearings and moving parts. Oil pressure warning lights should be treated seriously. A low oil-pressure warning is different from a routine maintenance reminder. Running an engine with low oil pressure can cause serious damage. Maintenance questions often test simple cause and effect: oil reduces friction, coolant removes heat, filters keep contaminants out, and belts drive accessories.

Electrical, Starting, and Charging

The battery stores electrical energy and provides current for starting. The starter motor cranks the engine. The alternator charges the battery and supplies electrical power while the engine runs. Fuses protect circuits from excessive current. A relay uses a small control current to switch a larger current. The ground connection completes the electrical path back to the battery. Corroded battery terminals, loose cables, blown fuses, and poor grounds can create electrical symptoms without any major component being broken.

Automotive electrical questions overlap with the ASVAB Electronics Information Practice Test. You do not need advanced electronics for the Auto Information page, but you should know that voltage is electrical potential, current is flow, resistance opposes current, and a short circuit can cause excessive current. A headlight that is dim may suggest low voltage, poor ground, high resistance, or a weak charging system depending on the rest of the symptoms.

Drivetrain, Brakes, Steering, and Suspension

The drivetrain moves engine torque to the wheels. A clutch can connect and disconnect engine power in a manual transmission. An automatic transmission uses fluid pressure and internal components to change gear ratios. A differential allows wheels on the same axle to rotate at different speeds while turning. Constant velocity joints help front-wheel-drive and independent-suspension vehicles transmit torque while the wheels steer or move up and down. Universal joints let a driveshaft operate at an angle.

Brakes convert motion into heat through friction. Disc brakes use calipers and pads squeezing a rotor. Drum brakes use shoes pressing against a drum. Brake fluid transfers force in a hydraulic brake system. Air in hydraulic brake lines can make the pedal feel spongy because air compresses more easily than brake fluid. Anti-lock braking systems help prevent wheel lockup during hard braking. Steering and suspension questions often test basic part functions: shocks and struts control spring movement, ball joints and tie rods connect moving steering or suspension parts, and wheel alignment affects tire wear and vehicle tracking.

Tires, Tools, Maintenance, and Safety

Tires are the vehicle's contact with the road. Proper inflation affects handling, fuel economy, braking, and tire wear. Underinflation can cause excess heat and shoulder wear. Overinflation can reduce the contact patch and cause center wear. Tire tread channels water away from the contact area. Uneven tire wear can point toward alignment, suspension, inflation, or rotation problems. A spare tire, jack, and lug wrench are basic roadside tools, but the vehicle must be supported correctly and parked safely before a wheel is removed.

Common hand tools include wrenches, sockets, ratchets, screwdrivers, pliers, torque wrenches, and gauges. A torque wrench tightens fasteners to a specified torque rather than by guesswork. A feeler gauge measures small gaps. A tire pressure gauge measures air pressure. A scan tool can read diagnostic trouble codes on many modern vehicles, but a code points to a system or fault condition and does not automatically prove one part is bad. Safety comes first: chock wheels, support a lifted vehicle with jack stands, disconnect the battery when appropriate, wear eye protection, and do not work under a vehicle supported only by a jack.

ASVAB Automotive Information Practice Test: 171 Questions

Answer each question before opening the explanation. These questions are written to build recognition of automobile technology terms and systems. They are not official ASVAB questions.

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  1. What is the main job of an automobile engine?
    1. Store brake fluid
    2. Convert fuel energy into mechanical power
    3. Hold the tires in alignment
    4. Filter cabin air only
    Answer and explanation

    Answer: B. The engine converts fuel energy into rotating mechanical power that can move the vehicle through the drivetrain.

  2. In a four-stroke gasoline engine, which stroke draws the air-fuel mixture into the cylinder?
    1. Intake
    2. Compression
    3. Power
    4. Exhaust
    Answer and explanation

    Answer: A. The intake stroke opens the intake path and draws air, or an air-fuel mixture, into the cylinder.

  3. Which stroke squeezes the air-fuel mixture before combustion?
    1. Exhaust
    2. Intake
    3. Compression
    4. Coasting
    Answer and explanation

    Answer: C. The compression stroke squeezes the mixture so combustion can produce useful force.

  4. Which engine part moves up and down inside a cylinder?
    1. Radiator
    2. Muffler
    3. Tie rod
    4. Piston
    Answer and explanation

    Answer: D. The piston moves inside the cylinder and transfers combustion force to the connecting rod and crankshaft.

  5. What does the crankshaft do?
    1. Cools brake fluid
    2. Changes piston motion into rotation
    3. Filters engine air
    4. Stores windshield washer fluid
    Answer and explanation

    Answer: B. The crankshaft converts the piston's up-and-down motion into rotating motion.

  6. What is the main job of the camshaft?
    1. Charge the battery
    2. Measure tire pressure
    3. Open and close engine valves at the correct time
    4. Absorb road bumps only
    Answer and explanation

    Answer: C. The camshaft controls valve timing so the engine can breathe correctly.

  7. What keeps the camshaft and crankshaft synchronized in many engines?
    1. Timing belt or timing chain
    2. Brake pad
    3. Radiator hose
    4. Shock absorber
    Answer and explanation

    Answer: A. A timing belt or chain coordinates camshaft and crankshaft movement.

  8. What is engine displacement?
    1. The weight of the vehicle battery
    2. The length of the exhaust pipe
    3. The air pressure in a tire
    4. The total swept volume of the engine cylinders
    Answer and explanation

    Answer: D. Displacement is based on the volume swept by the pistons in the cylinders.

  9. What is the bore of an engine cylinder?
    1. The piston travel distance
    2. The radiator width
    3. The brake rotor thickness only
    4. The cylinder diameter
    Answer and explanation

    Answer: D. Bore means the diameter of the cylinder.

  10. What is the stroke of an engine?
    1. The distance the piston travels
    2. The tire tread depth
    3. The spark plug thread size
    4. The amount of coolant in the radiator
    Answer and explanation

    Answer: A. Stroke is the distance the piston travels in the cylinder.

  11. What does a spark plug do in a gasoline engine?
    1. Measures oil pressure
    2. Pumps coolant
    3. Ignites the air-fuel mixture
    4. Turns the wheels directly
    Answer and explanation

    Answer: C. A spark plug creates the spark that ignites the compressed air-fuel mixture in a gasoline engine.

  12. What do diesel engines normally use to ignite fuel?
    1. Paint color
    2. Compression heat
    3. Brake fluid pressure
    4. Windshield washer fluid
    Answer and explanation

    Answer: B. Diesel engines rely on heat produced by high compression to ignite fuel.

  13. What is the main job of the air filter?
    1. Increase tire pressure
    2. Clean air before it enters the engine
    3. Store engine oil
    4. Stop brake rotors from turning
    Answer and explanation

    Answer: B. The air filter keeps dust and debris from entering the engine intake.

  14. What does a fuel pump do?
    1. Moves fuel from the tank toward the engine
    2. Cools the radiator fan
    3. Measures wheel alignment
    4. Locks the differential
    Answer and explanation

    Answer: A. The fuel pump supplies fuel from the tank to the engine's fuel system.

  15. What is the purpose of a fuel injector?
    1. Hold the wheel to the hub
    2. Support the vehicle on a lift
    3. Spray measured fuel into the intake or cylinder
    4. Measure coolant temperature only
    Answer and explanation

    Answer: C. Fuel injectors deliver controlled fuel amounts for combustion.

  16. What does the throttle control?
    1. The tread pattern on the tires
    2. The color of exhaust smoke only
    3. The brake light lens
    4. The amount of air entering the engine
    Answer and explanation

    Answer: D. The throttle controls airflow into the engine, which helps control engine power.

  17. What is the purpose of the exhaust system?
    1. Fill the battery with charge directly
    2. Carry burned gases away from the engine
    3. Hold transmission gears in place
    4. Set tire toe angle
    Answer and explanation

    Answer: B. The exhaust system carries combustion gases away and helps reduce noise and emissions.

  18. What does a catalytic converter help reduce?
    1. Vehicle height
    2. Tire pressure
    3. Harmful exhaust emissions
    4. Engine oil viscosity
    Answer and explanation

    Answer: C. A catalytic converter helps reduce harmful pollutants in exhaust gases.

  19. What does a muffler mainly reduce?
    1. Exhaust noise
    2. Engine oil level
    3. Brake pedal travel
    4. Battery voltage only
    Answer and explanation

    Answer: A. The muffler reduces exhaust noise.

  20. If an engine cranks but will not start, which basic need may be missing?
    1. Tire rotation only
    2. New windshield wipers only
    3. Extra cargo weight
    4. Fuel, spark, compression, or correct timing
    Answer and explanation

    Answer: D. A no-start condition often comes from missing fuel, spark, compression, or timing.

  21. What is the main job of engine oil?
    1. Inflate tires
    2. Power the headlights directly
    3. Clean the windshield
    4. Lubricate moving parts and reduce friction
    Answer and explanation

    Answer: D. Oil forms a protective film that reduces friction and wear between moving engine parts.

  22. Where is engine oil commonly stored before the oil pump circulates it?
    1. Oil pan
    2. Radiator
    3. Muffler
    4. Brake caliper
    Answer and explanation

    Answer: A. The oil pan holds oil at the bottom of the engine.

  23. What does the oil filter do?
    1. Stores compressed air
    2. Changes gear ratios
    3. Filters contaminants from engine oil
    4. Turns the steering wheel
    Answer and explanation

    Answer: C. The oil filter removes particles from the engine oil.

  24. What should a low oil-pressure warning be treated as?
    1. A signal to add washer fluid only
    2. A serious warning that can indicate engine damage risk
    3. A normal tire-pressure reminder
    4. A sign the radio needs tuning
    Answer and explanation

    Answer: B. Low oil pressure can quickly damage engine bearings and moving parts.

  25. What does oil viscosity describe?
    1. The tire's tread pattern
    2. The oil's resistance to flow
    3. The battery's color
    4. The muffler's noise level only
    Answer and explanation

    Answer: B. Viscosity describes how easily oil flows at a given temperature.

  26. What system controls engine operating temperature?
    1. Cooling system
    2. Seat belt system only
    3. Audio system
    4. Paint system
    Answer and explanation

    Answer: A. The cooling system removes and manages engine heat.

  27. What does the radiator do?
    1. Stores gasoline under pressure
    2. Changes tire size
    3. Releases heat from coolant to the air
    4. Opens intake valves
    Answer and explanation

    Answer: C. The radiator transfers heat from coolant to outside air.

  28. What does the water pump do in the cooling system?
    1. Measures brake pad thickness
    2. Turns the driveshaft directly
    3. Stores battery acid
    4. Circulates coolant
    Answer and explanation

    Answer: D. The water pump moves coolant through the engine and radiator.

  29. What is the purpose of the thermostat?
    1. Hold a wheel bearing in place
    2. Help regulate coolant flow and engine temperature
    3. Make spark plugs fire hotter always
    4. Measure tire tread only
    Answer and explanation

    Answer: B. The thermostat helps the engine warm up and then regulates coolant flow.

  30. Why should you avoid removing a hot radiator cap?
    1. The cap controls tire pressure
    2. The battery will immediately discharge
    3. Hot pressurized coolant can spray out and burn you
    4. The exhaust will become louder only
    Answer and explanation

    Answer: C. A hot cooling system can be pressurized, and coolant can cause severe burns.

  31. What can low coolant cause?
    1. Engine overheating
    2. Instant tire inflation
    3. More brake lining thickness
    4. A stronger radio signal only
    Answer and explanation

    Answer: A. Low coolant reduces the system's ability to remove engine heat.

  32. What does the battery provide during starting?
    1. Mechanical wheel alignment
    2. Exhaust back pressure
    3. Tire tread depth
    4. Electrical energy for the starter and circuits
    Answer and explanation

    Answer: D. The battery supplies electrical current needed for starting and other electrical loads.

  33. What is the starter motor used for?
    1. Cooling brake pads
    2. Changing tire tread
    3. Filtering exhaust gases
    4. Cranking the engine
    Answer and explanation

    Answer: D. The starter motor turns the engine until it can run on its own.

  34. What does the alternator do while the engine is running?
    1. Charges the battery and supplies electrical power
    2. Inflates the tires
    3. Turns coolant into oil
    4. Measures wheel toe only
    Answer and explanation

    Answer: A. The alternator produces electrical power and helps maintain battery charge.

  35. What does a fuse protect against?
    1. Low tire tread
    2. Worn brake shoes only
    3. Excessive current in a circuit
    4. Loose valve timing always
    Answer and explanation

    Answer: C. A fuse opens when current exceeds a safe level.

  36. What is the purpose of a relay?
    1. Store engine coolant
    2. Use a small control current to switch a larger current
    3. Balance a tire mechanically
    4. Change oil color
    Answer and explanation

    Answer: B. A relay lets a low-current control circuit operate a higher-current load.

  37. What can corroded battery terminals cause?
    1. More engine compression
    2. Poor electrical connection
    3. Perfect tire balance
    4. Lower vehicle weight only
    Answer and explanation

    Answer: B. Corrosion increases resistance and can reduce current flow.

  38. What does vehicle ground usually provide?
    1. A return path for electrical current
    2. Extra gasoline storage
    3. A way to cool brake fluid only
    4. A larger tire diameter
    Answer and explanation

    Answer: A. Ground completes the electrical circuit back to the battery or vehicle body reference.

  39. A dim headlight can be caused by which condition?
    1. Too much tire tread
    2. A clean air filter only
    3. High resistance or poor ground in the circuit
    4. A larger muffler tip
    Answer and explanation

    Answer: C. Poor connections or high resistance can reduce voltage available to the lamp.

  40. What is the job of the transmission?
    1. Store engine coolant
    2. Clean exhaust gases only
    3. Open intake valves directly
    4. Change gear ratios between the engine and wheels
    Answer and explanation

    Answer: D. The transmission changes torque and speed relationships for different driving conditions.

  41. What does a clutch do in a manual transmission vehicle?
    1. Filters gasoline
    2. Connects and disconnects engine power from the transmission
    3. Raises coolant boiling point
    4. Measures air pressure only
    Answer and explanation

    Answer: B. The clutch allows the driver to disconnect engine power for shifting and stopping.

  42. What does a differential allow drive wheels to do while turning?
    1. Stop receiving torque forever
    2. Become perfectly flat
    3. Rotate at different speeds
    4. Change tire pressure automatically
    Answer and explanation

    Answer: C. During a turn, the outside wheel travels farther, so the differential lets wheels rotate at different speeds.

  43. What does a driveshaft transfer?
    1. Torque from the transmission or transfer case toward the axle
    2. Coolant from the radiator to the heater core only
    3. Air from the cabin filter
    4. Brake dust to the wheels
    Answer and explanation

    Answer: A. A driveshaft carries rotating torque through the drivetrain.

  44. Why are constant velocity joints used on many front-wheel-drive vehicles?
    1. They store brake fluid
    2. They clean engine oil
    3. They measure exhaust noise only
    4. They transmit torque while allowing steering and suspension movement
    Answer and explanation

    Answer: D. CV joints handle drive torque while the wheels turn and move up and down.

  45. What is the main job of the brake system?
    1. Increase engine displacement
    2. Store windshield washer fluid
    3. Charge the alternator
    4. Slow or stop the vehicle
    Answer and explanation

    Answer: D. Brakes convert vehicle motion into heat through friction to slow or stop the vehicle.

  46. In a disc brake, what part squeezes the rotor?
    1. Caliper
    2. Radiator
    3. Fuel injector
    4. Timing chain
    Answer and explanation

    Answer: A. The caliper presses brake pads against the rotor.

  47. What are brake pads pressed against in a disc brake?
    1. Battery case
    2. Air filter
    3. Rotor
    4. Fuel tank
    Answer and explanation

    Answer: C. Brake pads clamp onto the rotor to create friction.

  48. In a drum brake, what part presses against the drum?
    1. Spark plugs
    2. Brake shoes
    3. Piston rings
    4. Radiator fins
    Answer and explanation

    Answer: B. Brake shoes press outward against the inside of the drum.

  49. What does brake fluid transmit in a hydraulic brake system?
    1. Fuel vapor to the engine
    2. Force or pressure from the pedal to the brakes
    3. Exhaust heat to the muffler
    4. Air pressure to the tires only
    Answer and explanation

    Answer: B. Hydraulic brake fluid transfers pedal force through the brake lines.

  50. What can air in hydraulic brake lines cause?
    1. A spongy brake pedal
    2. Higher engine compression
    3. More tire tread depth
    4. A clean fuel injector always
    Answer and explanation

    Answer: A. Air compresses more easily than brake fluid, which can make the pedal feel spongy.

  51. What does ABS stand for in braking systems?
    1. Automatic battery storage
    2. Air balance sensor
    3. Anti-lock braking system
    4. Axle bearing shield only
    Answer and explanation

    Answer: C. ABS means anti-lock braking system.

  52. What is the purpose of ABS during hard braking?
    1. Increase exhaust noise
    2. Raise oil viscosity always
    3. Open the thermostat
    4. Help prevent wheel lockup
    Answer and explanation

    Answer: D. ABS modulates braking to help prevent locked wheels during hard braking.

  53. What does the steering system do?
    1. Filters oil only
    2. Controls the direction of the vehicle
    3. Charges the battery
    4. Stores coolant in the muffler
    Answer and explanation

    Answer: B. The steering system turns the wheels so the driver can control direction.

  54. What do tie rods connect in many steering systems?
    1. Fuel tank to muffler
    2. Battery to oil pan only
    3. Steering linkage or rack to the steering knuckle
    4. Radiator to brake pedal
    Answer and explanation

    Answer: C. Tie rods help transfer steering movement to the wheels.

  55. What is the purpose of power steering?
    1. Reduce steering effort
    2. Increase engine displacement
    3. Make tires solid rubber
    4. Clean exhaust gases only
    Answer and explanation

    Answer: A. Power steering assists the driver so less effort is needed to turn the wheel.

  56. What does the suspension system do?
    1. Stores engine oil only
    2. Ignites gasoline directly
    3. Filters cabin music
    4. Supports the vehicle and helps keep tires in contact with the road
    Answer and explanation

    Answer: D. Suspension supports the vehicle, absorbs road irregularities, and helps maintain tire contact.

  57. What do shock absorbers or struts mainly control?
    1. Fuel injector spray pattern only
    2. Battery acid level
    3. Crankshaft timing directly
    4. Spring movement and bouncing
    Answer and explanation

    Answer: D. Shocks and struts dampen suspension movement.

  58. What is wheel alignment related to?
    1. Wheel angles such as toe, camber, and caster
    2. Oil filter color only
    3. Fuel octane rating only
    4. Radio antenna length
    Answer and explanation

    Answer: A. Alignment sets wheel angles so the vehicle tracks correctly and tires wear properly.

  59. What can poor alignment cause?
    1. More engine oil pressure always
    2. Cleaner spark plugs only
    3. Uneven tire wear or pulling
    4. Lower coolant temperature in every case
    Answer and explanation

    Answer: C. Alignment problems can make a vehicle pull and can wear tires unevenly.

  60. What is tire tread designed to help do?
    1. Store gasoline
    2. Provide traction and channel water away
    3. Measure battery voltage
    4. Open exhaust valves
    Answer and explanation

    Answer: B. Tread grips the road and helps move water away from the contact patch.

  61. What can underinflated tires cause?
    1. Perfect fuel economy always
    2. Excess heat and uneven wear
    3. Instantly higher engine compression
    4. Cleaner coolant only
    Answer and explanation

    Answer: B. Underinflation can overheat the tire and wear the shoulders.

  62. What can overinflated tires tend to wear most?
    1. Center of the tread
    2. Only the sidewall lettering
    3. Brake pads
    4. Fuel injectors
    Answer and explanation

    Answer: A. Overinflation can concentrate wear near the center of the tread.

  63. What tool measures tire air pressure?
    1. Torque wrench only
    2. Feeler gauge only
    3. Tire pressure gauge
    4. Timing light only
    Answer and explanation

    Answer: C. A tire pressure gauge measures the air pressure in a tire.

  64. What tool tightens a fastener to a specified torque?
    1. Paint scraper
    2. Radiator cap
    3. Fuel nozzle only
    4. Torque wrench
    Answer and explanation

    Answer: D. A torque wrench applies a measured twisting force to a fastener.

  65. What does a feeler gauge measure?
    1. Fuel tank volume only
    2. Small gaps or clearances
    3. Tire color
    4. Vehicle speed directly
    Answer and explanation

    Answer: B. Feeler gauges use thin blades to measure small gaps.

  66. What is a socket wrench commonly used for?
    1. Measuring coolant temperature only
    2. Filtering oil
    3. Turning nuts and bolts
    4. Balancing wheels by itself
    Answer and explanation

    Answer: C. A socket wrench turns fasteners such as nuts and bolts.

  67. What is the safest support for a raised vehicle before working underneath?
    1. Jack stands on a stable surface
    2. A hydraulic jack alone
    3. A spare tire leaning nearby only
    4. A cardboard box
    Answer and explanation

    Answer: A. Jack stands are designed to support a vehicle; a jack alone is not safe for working underneath.

  68. Why should wheels be chocked when appropriate?
    1. To clean the fuel injectors
    2. To increase engine compression
    3. To raise coolant pressure only
    4. To help prevent the vehicle from rolling
    Answer and explanation

    Answer: D. Wheel chocks help keep a parked or lifted vehicle from moving.

  69. What does a scan tool commonly read on modern vehicles?
    1. Tire tread depth automatically in every car
    2. Brake pad material only
    3. Paint thickness always
    4. Diagnostic trouble codes
    Answer and explanation

    Answer: D. A scan tool can read diagnostic trouble codes and related data from vehicle control modules.

  70. What does a diagnostic trouble code usually indicate?
    1. A fault condition or system needing diagnosis
    2. Proof that one exact part must always be replaced
    3. The vehicle's paint color
    4. The tire brand only
    Answer and explanation

    Answer: A. A code points to a condition or circuit but still requires diagnosis before replacing parts.

  71. What should you do before disconnecting many electrical components when appropriate?
    1. Spray water on the fuse box
    2. Short the wires with a screwdriver
    3. Disconnect or isolate battery power according to service guidance
    4. Inflate all tires above the sidewall limit
    Answer and explanation

    Answer: C. Removing power when appropriate reduces the chance of shorts, shock, or accidental operation.

  72. What is the purpose of a serpentine belt?
    1. Hold the brake pads to the rotor
    2. Drive engine accessories
    3. Seal the fuel tank cap only
    4. Measure oil viscosity
    Answer and explanation

    Answer: B. A serpentine belt drives accessories such as the alternator, power steering pump, or water pump on many vehicles.

  73. What does an engine vacuum leak often affect?
    1. Tire sidewall height only
    2. Air entering the engine and idle quality
    3. Brake rotor diameter always
    4. Wheel paint color
    Answer and explanation

    Answer: B. A vacuum leak allows unmetered air into the engine and can cause rough idle or lean operation.

  74. What does rough idle mean?
    1. The engine runs unevenly at idle speed
    2. The tires are overinflated only
    3. The headlights are too bright
    4. The brake pedal is missing
    Answer and explanation

    Answer: A. Rough idle describes an engine that shakes, stumbles, or runs unevenly when not being accelerated.

  75. What can a misfire mean?
    1. The tires are rotating correctly
    2. The radiator cap is new only
    3. One or more cylinders are not firing correctly
    4. The vehicle is perfectly aligned
    Answer and explanation

    Answer: C. A misfire occurs when combustion does not happen properly in a cylinder.

  76. Which fluid is usually checked with the engine off and vehicle level on many vehicles?
    1. Paint fluid
    2. Tire air by radiator cap
    3. Exhaust pressure in the battery
    4. Engine oil level by dipstick or specified procedure
    Answer and explanation

    Answer: D. Engine oil is commonly checked with a dipstick or manufacturer procedure, often with the vehicle level.

  77. What is coolant usually a mixture of?
    1. Gasoline and brake dust
    2. Water and antifreeze/coolant
    3. Oil and tire rubber only
    4. Air and spark plugs
    Answer and explanation

    Answer: B. Coolant is commonly a mixture of water and antifreeze/coolant to manage heat and freezing protection.

  78. What can white sweet-smelling exhaust smoke suggest?
    1. Tire pressure is too high
    2. The battery is fully charged only
    3. Coolant may be entering the combustion chamber
    4. Brake pads are new
    Answer and explanation

    Answer: C. White sweet-smelling exhaust can suggest coolant burning, though diagnosis is needed.

  79. What can blue exhaust smoke suggest?
    1. Engine oil is being burned
    2. The brake lights are working perfectly
    3. The tires are new only
    4. The radiator is empty in every case
    Answer and explanation

    Answer: A. Blue smoke is commonly associated with oil burning in the combustion chamber.

  80. What can black exhaust smoke suggest on a gasoline engine?
    1. Perfect combustion always
    2. Low tire tread only
    3. Clean cabin filter only
    4. Too much fuel or a rich mixture
    Answer and explanation

    Answer: D. Black smoke often suggests an overly rich fuel mixture.

  81. What does an oxygen sensor help monitor?
    1. Tire tread color
    2. Brake rotor weight only
    3. Transmission gear count by itself
    4. Oxygen content in exhaust for fuel-control feedback
    Answer and explanation

    Answer: D. Oxygen sensors help the engine computer adjust fuel mixture based on exhaust oxygen.

  82. What is the purpose of the engine control module or computer?
    1. Control and monitor engine-related functions
    2. Hold the vehicle up on jack stands
    3. Absorb road bumps directly
    4. Replace every fuse permanently
    Answer and explanation

    Answer: A. The engine computer uses sensor inputs to control fuel, ignition, emissions, and other functions.

  83. What does a mass airflow sensor measure?
    1. Brake pedal color
    2. Oil pan depth only
    3. Amount of air entering the engine
    4. Wheel lug pattern always
    Answer and explanation

    Answer: C. A mass airflow sensor measures intake air so fuel can be matched to airflow.

  84. What can a clogged air filter reduce?
    1. Tire pressure instantly
    2. Airflow to the engine
    3. Brake fluid boiling point only
    4. Vehicle registration cost
    Answer and explanation

    Answer: B. A clogged air filter restricts air entering the engine.

  85. What does the PCV system help manage?
    1. Tire bead seating only
    2. Crankcase vapors
    3. Brake shoe arc always
    4. Seat belt length
    Answer and explanation

    Answer: B. Positive crankcase ventilation routes crankcase vapors for controlled handling.

  86. What does the evaporative emissions system help control?
    1. Fuel vapors from the tank and fuel system
    2. Engine oil color only
    3. Wheel camber by itself
    4. Headlight brightness mechanically
    Answer and explanation

    Answer: A. EVAP systems reduce fuel vapor emissions from the fuel system.

  87. What can a loose gas cap sometimes trigger?
    1. A flat tire instantly
    2. A broken camshaft always
    3. An evaporative emissions-related warning or code
    4. A locked brake pedal only
    Answer and explanation

    Answer: C. A loose cap can allow vapor leakage and may trigger an EVAP-related code on many vehicles.

  88. What is the main job of the heater core?
    1. Store brake fluid
    2. Hold the timing chain
    3. Inflate the tires
    4. Transfer engine coolant heat to cabin air
    Answer and explanation

    Answer: D. A heater core uses hot coolant to warm air for the cabin.

  89. What does the A/C compressor do?
    1. Compresses brake pads only
    2. Compresses refrigerant in the air-conditioning system
    3. Raises tire tread height
    4. Charges the engine oil filter
    Answer and explanation

    Answer: B. The compressor moves and compresses refrigerant through the A/C system.

  90. What does the cabin air filter clean?
    1. Gasoline before combustion only
    2. Oil before bearings always
    3. Air entering the passenger compartment
    4. Brake fluid in the master cylinder
    Answer and explanation

    Answer: C. Cabin filters remove dust and particles from air entering the passenger area.

  91. What is a master cylinder part of?
    1. Hydraulic brake system
    2. Exhaust system only
    3. Tire tread system
    4. Radio antenna circuit
    Answer and explanation

    Answer: A. The master cylinder creates hydraulic pressure for the brake system.

  92. What does the parking brake usually do?
    1. Raises engine compression
    2. Charges the battery faster always
    3. Filters engine oil
    4. Helps hold the vehicle stationary when parked
    Answer and explanation

    Answer: D. The parking brake is used to help keep the vehicle from moving when parked.

  93. What does wheel balancing correct?
    1. Low engine oil pressure
    2. Exhaust gas oxygen content only
    3. Camshaft timing directly
    4. Uneven weight distribution around the wheel and tire assembly
    Answer and explanation

    Answer: D. Balancing adds or adjusts weight to reduce vibration from uneven rotating mass.

  94. A steering wheel shake at certain speeds can be caused by what?
    1. Unbalanced wheels or tire issues
    2. A clean air filter only
    3. Fresh windshield washer fluid
    4. Correct spark plug gap always
    Answer and explanation

    Answer: A. Wheel imbalance and tire problems are common causes of speed-related vibration.

  95. What does tire rotation help promote?
    1. Higher battery voltage only
    2. More exhaust noise
    3. More even tire wear
    4. Lower engine displacement
    Answer and explanation

    Answer: C. Rotating tires changes their positions to help even out wear patterns.

  96. What does a wheel bearing allow?
    1. Fuel injection timing only
    2. Wheel rotation with reduced friction
    3. Coolant filtration
    4. Brake fluid storage in the tire
    Answer and explanation

    Answer: B. Wheel bearings support the wheel and let it rotate smoothly.

  97. What can a humming noise that changes with vehicle speed suggest?
    1. Perfect battery charge only
    2. Possible tire or wheel bearing issue
    3. New coolant always
    4. Correct oil viscosity in every case
    Answer and explanation

    Answer: B. Speed-related humming can point to tires or wheel bearings, though diagnosis is needed.

  98. What does a universal joint allow a driveshaft to do?
    1. Transmit torque through an angle
    2. Measure tire pressure
    3. Filter cabin air only
    4. Raise the radiator cap pressure by itself
    Answer and explanation

    Answer: A. A universal joint lets a driveshaft operate even when components are not perfectly in line.

  99. What is a transfer case used for in many four-wheel-drive vehicles?
    1. Storing engine oil only
    2. Cooling the passenger cabin
    3. Distributing power to front and rear drivetrains
    4. Filtering exhaust gas
    Answer and explanation

    Answer: C. The transfer case sends drive power to more than one axle in many 4WD systems.

  100. What does traction control try to reduce?
    1. Engine oil pressure always
    2. Brake pedal height only
    3. Gasoline vapor in the tank by itself
    4. Wheel spin during acceleration
    Answer and explanation

    Answer: D. Traction control helps limit wheel spin when accelerating on low-traction surfaces.

  101. What does electronic stability control help with?
    1. Increasing tire pressure automatically in all vehicles
    2. Maintaining vehicle control during skids or loss of stability
    3. Cleaning spark plugs
    4. Changing oil viscosity only
    Answer and explanation

    Answer: B. Stability control helps the vehicle maintain the intended path during certain traction losses.

  102. What does the engine temperature gauge warn about?
    1. Tire tread pattern only
    2. Battery age always
    3. Engine overheating or abnormal temperature
    4. Brake pad material color
    Answer and explanation

    Answer: C. The temperature gauge helps the driver notice overheating or abnormal temperature.

  103. What does the tachometer show?
    1. Engine speed in revolutions per minute
    2. Vehicle paint thickness
    3. Tire age only
    4. Coolant mixture percentage always
    Answer and explanation

    Answer: A. A tachometer displays engine RPM.

  104. What does the speedometer show?
    1. Engine oil pressure only
    2. Brake pad thickness
    3. Fuel octane rating
    4. Vehicle road speed
    Answer and explanation

    Answer: D. The speedometer indicates how fast the vehicle is moving.

  105. What does a fuel gauge show?
    1. Oil filter restriction always
    2. Tire tread depth
    3. Wheel bearing torque only
    4. Approximate fuel level in the tank
    Answer and explanation

    Answer: D. The fuel gauge estimates the amount of fuel in the tank.

  106. What is one likely cause if a vehicle pulls to one side while driving?
    1. Alignment, tire, or brake problem
    2. Perfect steering geometry
    3. A clean cabin filter only
    4. Correct engine timing always
    Answer and explanation

    Answer: A. Pulling can come from alignment, tire pressure, tire condition, or brake drag.

  107. What can a squealing noise when braking often suggest?
    1. High engine compression only
    2. Correct radiator pressure always
    3. Brake pad wear indicator or brake noise issue
    4. New fuel pump
    Answer and explanation

    Answer: C. Squealing during braking can indicate worn pads or other brake noise problems.

  108. What can a grinding noise when braking suggest?
    1. Perfectly new brake pads
    2. Severely worn brake friction material or metal contact
    3. Normal tire rotation only
    4. Clean fuel injectors always
    Answer and explanation

    Answer: B. Grinding can mean brake material is worn down and metal parts are contacting.

  109. What does a serpentine belt squeal often suggest?
    1. Brake fluid is too clean
    2. Belt slip, wear, tension, or pulley issue
    3. Tire tread is too deep only
    4. The fuel tank is full always
    Answer and explanation

    Answer: B. Belt squeal often comes from belt slip, wear, incorrect tension, or pulley problems.

  110. What is the purpose of the radiator fan?
    1. Move air through the radiator when needed
    2. Push fuel through injectors
    3. Increase tire tread depth
    4. Measure brake pressure only
    Answer and explanation

    Answer: A. The fan increases airflow through the radiator, especially at low vehicle speeds.

  111. What does a coolant hose do?
    1. Carry exhaust gases to the muffler only
    2. Hold brake pads in place
    3. Carry coolant between cooling-system parts
    4. Turn the steering wheel
    Answer and explanation

    Answer: C. Coolant hoses route coolant between the engine, radiator, heater core, and related parts.

  112. What can a leaking coolant hose cause?
    1. Higher tire pressure always
    2. Cleaner engine oil only
    3. A stronger battery ground
    4. Low coolant and overheating
    Answer and explanation

    Answer: D. Coolant leaks reduce coolant level and can lead to overheating.

  113. What is the main purpose of routine oil changes?
    1. Change the tire size
    2. Replace degraded or contaminated oil
    3. Recharge the alternator only
    4. Reset wheel alignment mechanically
    Answer and explanation

    Answer: B. Oil changes replace oil that has aged, collected contaminants, or lost performance.

  114. What can a dirty fuel filter restrict?
    1. Brake pedal travel only
    2. Tire rotation direction
    3. Fuel flow
    4. Coolant fan speed always
    Answer and explanation

    Answer: C. A clogged fuel filter can limit the fuel reaching the engine.

  115. What does octane rating describe for gasoline?
    1. Resistance to knock or detonation
    2. Tire sidewall strength only
    3. Brake fluid color always
    4. Oil filter size
    Answer and explanation

    Answer: A. Octane rating describes fuel resistance to uncontrolled combustion knock.

  116. What is engine knock?
    1. A normal tire rotation pattern
    2. A new muffler sound only
    3. A sign of perfect timing always
    4. Abnormal combustion noise or detonation
    Answer and explanation

    Answer: D. Knock is abnormal combustion that can make a pinging or knocking sound.

  117. What does compression in an engine cylinder help create?
    1. Extra tire sidewall lettering
    2. Brake fluid storage only
    3. More windshield washer spray
    4. Conditions for strong combustion
    Answer and explanation

    Answer: D. Good compression helps combustion produce useful force.

  118. What can worn piston rings cause?
    1. Low compression or oil burning
    2. Perfect tire alignment
    3. More alternator output always
    4. Cleaner brake fluid only
    Answer and explanation

    Answer: A. Worn rings can let compression leak and allow oil into the combustion chamber.

  119. What does a head gasket seal?
    1. The tire bead to the rim only
    2. The muffler tip to the bumper
    3. The joint between engine block and cylinder head
    4. The brake pad to the caliper
    Answer and explanation

    Answer: C. The head gasket seals combustion, coolant, and oil passages between the block and head.

  120. A failed head gasket can allow what to mix or leak?
    1. Tires and wheels into one part
    2. Coolant, oil, or combustion gases
    3. Brake pads and spark plugs only
    4. Air filter and radio antenna
    Answer and explanation

    Answer: B. A head gasket failure can cause coolant, oil, and combustion gases to enter places they should not.

  121. What does the serpentine belt tensioner do?
    1. Stores gasoline pressure
    2. Maintains belt tension
    3. Controls tire tread depth only
    4. Seals the radiator cap permanently
    Answer and explanation

    Answer: B. The tensioner helps keep the belt tight enough to drive accessories.

  122. What is a gasket generally used for?
    1. Sealing between parts
    2. Measuring wheel speed only
    3. Raising tire pressure automatically
    4. Changing gear ratios by itself
    Answer and explanation

    Answer: A. Gaskets seal mating surfaces so fluids, gases, or pressure do not leak.

  123. What does an engine mount do?
    1. Filters brake fluid
    2. Charges the battery directly
    3. Secures the engine and helps isolate vibration
    4. Raises coolant boiling point by itself
    Answer and explanation

    Answer: C. Engine mounts hold the engine in place and reduce vibration transfer.

  124. What does a wheel lug nut do?
    1. Controls injector timing
    2. Filters cabin air
    3. Stores transmission fluid only
    4. Fastens the wheel to the hub
    Answer and explanation

    Answer: D. Lug nuts clamp the wheel to the hub or wheel studs.

  125. Why should lug nuts be tightened in the correct pattern?
    1. To increase engine compression
    2. To seat the wheel evenly
    3. To clean fuel vapor lines only
    4. To make the battery stronger
    Answer and explanation

    Answer: B. A proper tightening pattern helps the wheel seat evenly against the hub.

  126. What is transmission fluid used for in many automatic transmissions?
    1. Inflating tires
    2. Cleaning exhaust gases only
    3. Lubrication, cooling, and hydraulic operation
    4. Opening engine valves directly
    Answer and explanation

    Answer: C. Automatic transmission fluid lubricates, cools, and transmits hydraulic force.

  127. What can slipping transmission symptoms feel like?
    1. Engine speed rises without matching vehicle acceleration
    2. Brake pedal becomes firmer always
    3. Tires instantly gain tread
    4. Headlights become brighter only
    Answer and explanation

    Answer: A. A slipping transmission may let engine RPM rise without proportional vehicle movement.

  128. What is the purpose of grease in wheel bearings or joints?
    1. Raise fuel octane
    2. Cool exhaust gas only
    3. Store battery voltage
    4. Lubricate and reduce wear
    Answer and explanation

    Answer: D. Grease provides lubrication where oil circulation is not used.

  129. What can a torn CV boot lead to?
    1. Perfect wheel balance
    2. Cleaner coolant always
    3. More brake pedal pressure only
    4. Loss of grease and joint contamination
    Answer and explanation

    Answer: D. A torn boot lets grease escape and dirt enter, which can damage the CV joint.

  130. What does a brake rotor do?
    1. Provides a friction surface for brake pads
    2. Stores engine coolant only
    3. Measures fuel pressure
    4. Turns the camshaft directly
    Answer and explanation

    Answer: A. The rotor is the disc that brake pads squeeze to slow the wheel.

  131. What does the master cylinder convert pedal force into?
    1. Fuel vapor only
    2. Electrical spark
    3. Hydraulic pressure
    4. Wheel alignment angle
    Answer and explanation

    Answer: C. The master cylinder converts pedal force into brake hydraulic pressure.

  132. What can low brake fluid indicate?
    1. Perfect brake condition always
    2. Possible leak or worn brake components
    3. Higher fuel octane
    4. A clean air filter only
    Answer and explanation

    Answer: B. Low brake fluid should be checked because leaks or worn parts may be involved.

  133. What is the purpose of a ball joint?
    1. Filter gasoline only
    2. Allow steering and suspension movement at a joint
    3. Hold the muffler quiet by itself
    4. Charge the battery
    Answer and explanation

    Answer: B. Ball joints let suspension and steering parts move while staying connected.

  134. What can worn shocks cause?
    1. Excessive bouncing or poor control
    2. More engine compression always
    3. Cleaner fuel injectors
    4. Higher coolant pressure only
    Answer and explanation

    Answer: A. Worn shocks cannot control spring movement effectively.

  135. What is camber in wheel alignment?
    1. Fuel pressure at the injector
    2. Coolant temperature only
    3. Inward or outward tilt of the wheel when viewed from the front
    4. Battery charging rate always
    Answer and explanation

    Answer: C. Camber is the tilt of the wheel relative to vertical when viewed from the front.

  136. What is toe in wheel alignment?
    1. The depth of engine oil
    2. The color of brake fluid only
    3. The number of spark plugs always
    4. Whether wheels point inward or outward when viewed from above
    Answer and explanation

    Answer: D. Toe describes the inward or outward pointing of wheels from a top view.

  137. What does a tire sidewall usually show?
    1. Engine firing order only
    2. Size and load/speed information
    3. Coolant mixture ratio always
    4. Brake pad thickness
    Answer and explanation

    Answer: B. Tire sidewalls include size, load, speed, and other tire information.

  138. What does the load rating of a tire relate to?
    1. Fuel injector pulse width only
    2. Engine compression ratio always
    3. How much weight the tire can carry
    4. Alternator belt tension
    Answer and explanation

    Answer: C. Tire load rating indicates the load-carrying capacity.

  139. What should be used to find the recommended tire pressure for a vehicle?
    1. Vehicle placard or owner's information
    2. Random pressure printed by another tire brand only
    3. The color of the valve cap
    4. The exhaust pipe diameter
    Answer and explanation

    Answer: A. The vehicle placard or owner's information gives the pressure intended for that vehicle and tire size.

  140. What can low tire tread increase?
    1. Engine oil pressure always
    2. Alternator output only
    3. Fuel octane rating
    4. Risk of poor wet traction
    Answer and explanation

    Answer: D. Low tread reduces the tire's ability to channel water and maintain traction.

  141. What is hydroplaning?
    1. Coolant boiling in the radiator only
    2. Battery overcharging
    3. Brake pads sticking to rotors always
    4. Tires riding on water instead of gripping the road
    Answer and explanation

    Answer: D. Hydroplaning occurs when water separates the tire from the road surface.

  142. What should be done with a damaged tire sidewall?
    1. Have it inspected and usually replaced if unsafe
    2. Ignore it because sidewalls never matter
    3. Fill the radiator with air
    4. Use it to test spark plug gap
    Answer and explanation

    Answer: A. Sidewall damage can be dangerous and should be evaluated, often leading to replacement.

  143. What does a torque specification prevent?
    1. All engine overheating forever
    2. Fuel evaporation in every case
    3. Guessing fastener tightness
    4. Cabin filter clogging only
    Answer and explanation

    Answer: C. Torque specifications help avoid under-tightening or over-tightening fasteners.

  144. What happens if a bolt is over-tightened?
    1. The fuel tank fills itself
    2. Threads or parts can be damaged
    3. The tire tread becomes deeper
    4. The radiator cap disappears only
    Answer and explanation

    Answer: B. Too much torque can strip threads, distort parts, or break fasteners.

  145. What does PPE mean in shop safety?
    1. Power piston exhaust
    2. Personal protective equipment
    3. Paint pressure engine
    4. Parking pedal extension only
    Answer and explanation

    Answer: B. PPE means personal protective equipment such as eye protection and gloves when appropriate.

  146. Why is eye protection important when working around vehicles?
    1. Fluids, debris, or metal particles can injure eyes
    2. It increases engine horsepower always
    3. It changes tire pressure only
    4. It charges the battery faster
    Answer and explanation

    Answer: A. Automotive work can involve flying debris, chemicals, and pressurized fluids.

  147. What should be done with spilled oil or coolant on the floor?
    1. Leave it because it improves traction
    2. Use it as brake fluid
    3. Clean it promptly to reduce slip and environmental hazards
    4. Pour it into the battery
    Answer and explanation

    Answer: C. Spills create hazards and should be cleaned and disposed of properly.

  148. Why should a running engine not be used in a closed garage?
    1. It makes tires rotate backward only
    2. It overinflates the tires always
    3. It changes oil into coolant
    4. Exhaust can contain deadly carbon monoxide
    Answer and explanation

    Answer: D. Carbon monoxide in exhaust can build up indoors and is dangerous or fatal.

  149. What does carbon monoxide smell like?
    1. Like fresh gasoline always
    2. It is odorless
    3. Like burned rubber only
    4. Like brake fluid
    Answer and explanation

    Answer: B. Carbon monoxide is odorless, which makes ventilation critical.

  150. What should you do before working near a moving belt or fan?
    1. Hold the belt with a rag
    2. Spray fuel on the belt
    3. Keep hands, tools, and clothing clear; shut off the engine when appropriate
    4. Remove eye protection
    Answer and explanation

    Answer: C. Moving belts and fans can pull in fingers, tools, or clothing.

  151. What does preventive maintenance mean?
    1. Service performed to reduce the chance of future problems
    2. Waiting until every part fails
    3. Replacing tires with any size
    4. Ignoring fluid levels
    Answer and explanation

    Answer: A. Preventive maintenance, such as oil changes and inspections, helps prevent breakdowns.

  152. What does a maintenance schedule tell you?
    1. The exact color of every spark plug in all cars
    2. The price of gasoline forever
    3. How to ignore warning lights
    4. When services should be performed
    Answer and explanation

    Answer: D. A schedule lists service intervals based on time, mileage, or conditions.

  153. What should a driver do if the oil-pressure warning light comes on while driving?
    1. Drive faster to build pressure always
    2. Add washer fluid only
    3. Ignore it until the next year
    4. Stop safely and address the issue promptly
    Answer and explanation

    Answer: D. Low oil pressure can damage the engine quickly, so safe stopping and diagnosis are important.

  154. What should a driver do if the temperature gauge shows severe overheating?
    1. Stop safely and allow the engine to cool before checking
    2. Remove the hot radiator cap immediately
    3. Keep driving at high speed always
    4. Drain the engine oil on the road
    Answer and explanation

    Answer: A. Severe overheating requires safe stopping and cooling; opening a hot system is dangerous.

  155. What does a check engine light mean?
    1. The engine is guaranteed destroyed
    2. The tires are perfectly balanced
    3. The vehicle computer detected a fault or abnormal condition
    4. The fuel tank is always empty
    Answer and explanation

    Answer: C. The light means the control system has detected a fault; diagnosis is needed.

  156. What is the best first step when a warning light appears?
    1. Cover the light with tape
    2. Identify the warning and follow safe service guidance
    3. Disconnect random wires
    4. Drain all fluids immediately
    Answer and explanation

    Answer: B. Warning lights should be identified and handled according to the vehicle's guidance and safety needs.

  157. What does a wiring diagram show?
    1. Tire tread compound only
    2. Electrical circuit connections
    3. Brake pad friction rating always
    4. Fuel tank capacity by color
    Answer and explanation

    Answer: B. Wiring diagrams show how electrical components and circuits connect.

  158. What is continuity in an electrical circuit?
    1. A complete conductive path
    2. A tire with no tread
    3. A broken belt only
    4. An overheated radiator
    Answer and explanation

    Answer: A. Continuity means current has a complete path through the circuit.

  159. What tool can measure voltage, resistance, and sometimes current?
    1. Feeler gauge only
    2. Floor jack only
    3. Multimeter
    4. Oil drain pan
    Answer and explanation

    Answer: C. A multimeter is used for electrical measurements such as voltage and resistance.

  160. When measuring resistance with an ohmmeter, the circuit is usually what?
    1. Running at full throttle
    2. Filled with coolant
    3. Under tire load only
    4. De-energized
    Answer and explanation

    Answer: D. Resistance checks are normally made with power removed to avoid damaging the meter or getting false readings.

  161. What does voltage drop testing help find?
    1. Exact tire age only
    2. Excess resistance in a circuit under load
    3. Brake shoe diameter always
    4. Fuel color in the tank
    Answer and explanation

    Answer: B. Voltage drop tests can reveal poor connections or excessive resistance while the circuit operates.

  162. Which fluid is usually not compressible enough to replace brake fluid in a brake system?
    1. Approved brake fluid
    2. Hydraulic fluid specified for the system
    3. Air
    4. Correct service fluid
    Answer and explanation

    Answer: C. Air compresses and causes spongy brakes; brake systems require the specified fluid and proper bleeding.

  163. What does bleeding brakes remove?
    1. Air from the hydraulic brake system
    2. Tread from the tire
    3. Oil from the radiator only
    4. Fuel from the exhaust pipe
    Answer and explanation

    Answer: A. Brake bleeding removes trapped air so hydraulic pressure transfers properly.

  164. What can contaminated brake fluid do?
    1. Increase tire tread depth
    2. Clean the engine oil automatically
    3. Raise fuel octane always
    4. Reduce brake performance or damage parts
    Answer and explanation

    Answer: D. Brake fluid contamination can affect boiling point, corrosion protection, and component life.

  165. What does the radiator cap help maintain?
    1. Tire alignment angle only
    2. Brake pedal height always
    3. Engine oil color
    4. Cooling-system pressure
    Answer and explanation

    Answer: D. A radiator cap helps maintain pressure, which raises coolant boiling point.

  166. What does the overflow or expansion tank allow?
    1. Coolant expansion and recovery
    2. Gasoline injection only
    3. Brake pad storage
    4. Alternator belt routing always
    Answer and explanation

    Answer: A. The tank gives expanding coolant a place to go and can return coolant as the system cools.

  167. What is the safest way to identify a vehicle-specific fluid type?
    1. Use any fluid with the same color
    2. Guess by smell only
    3. Use the owner's or service information for that vehicle
    4. Use water for every system
    Answer and explanation

    Answer: C. Vehicle-specific information identifies the correct oil, coolant, brake fluid, and transmission fluid.

  168. What does a shop manual or service information provide?
    1. Only entertainment settings
    2. Procedures, specifications, and diagnostic information
    3. Fuel prices for all states
    4. Random tire sizes
    Answer and explanation

    Answer: B. Service information gives specifications, steps, wiring, and diagnostic guidance for the vehicle.

  169. What does "left" and "right" usually mean in automotive service directions?
    1. As viewed from the front bumper only
    2. As viewed from the driver's seated position facing forward
    3. Randomly chosen by the technician
    4. Based on tire brand
    Answer and explanation

    Answer: B. Left and right usually refer to the driver's perspective while seated and facing forward.

  170. What should be done before replacing an expensive part based only on a code?
    1. Diagnose the circuit or system to confirm the fault
    2. Replace every related part immediately
    3. Ignore the code forever
    4. Drain the fuel tank into the street
    Answer and explanation

    Answer: A. Codes guide diagnosis, but testing confirms whether the part, wiring, connection, or condition is the real cause.

  171. What is the main study skill behind Auto Information questions?
    1. Memorizing random vehicle colors
    2. Guessing every tool by size only
    3. Matching each part or symptom to the system it belongs to
    4. Ignoring maintenance vocabulary
    Answer and explanation

    Answer: C. AI questions become easier when you connect parts, symptoms, tools, and services to the correct vehicle system.

What Your Practice Result Means

This practice test does not produce an official ASVAB score. Official ASVAB scoring uses standard-score procedures, and Auto Information is not part of AFQT. Use your result as a topic diagnostic. If most misses are from engine questions, review the four-stroke cycle, oil, cooling, fuel, and ignition. If most misses are from electrical questions, use the Electronics Information practice page. If most misses are from steering, suspension, brakes, and drivetrain, review the function of each system before timing yourself.

Practice score out of 171MeaningNext step
146-171Strong AI practice readinessMove to timed 10-question CAT-style sets in about 7 minutes.
120-145Useful foundation with several fixable gapsReview the two weakest vehicle systems and retake those items after 24 hours.
86-119Basic recognition is forming, but part names and system jobs are mixedStudy engine, cooling, lubrication, brakes, electrical, and tire vocabulary before timing.
Below 86Start from the automotive basicsUse the beginner review as lessons and practice in smaller 20-question groups.

Official Sources Used

The ASVAB structure, Auto Information description, timing, CAT-ASVAB context, paper-and-pencil Auto and Shop context, and AFQT relationship in this page were checked against official ASVAB and ASVAB CEP sources. The 171 practice questions are original NUM8ERS study questions.

Official ASVAB: Auto Information sample page Official ASVAB: Sample Questions Official ASVAB: Subtests Official ASVAB: CAT-ASVAB Official ASVAB Fact Sheet PDF Official ASVAB: What to Expect Official ASVAB: Preparing for the ASVAB Official ASVAB: Understanding ASVAB Scores Official ASVAB FAQs

ASVAB Automotive Information Practice Test FAQs

Are these real ASVAB Auto Information questions?

No. They are original practice questions written for study. They are based on the official public AI skill description, not copied from official test forms or official sample questions.

What does Auto Information test?

Official ASVAB materials describe Auto Information as knowledge of automobile technology.

Does Auto Information count toward AFQT?

No. Official score guidance lists Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge, and Paragraph Comprehension as the four AFQT subtests. AI can still matter for broader ASVAB job-related composites.

How many Auto Information questions are on the real ASVAB?

Official CAT-ASVAB information lists 10 scored Auto Information questions when no tryout questions are present. The 2025 official fact sheet lists paper-and-pencil Auto and Shop Information together as 25 questions.

How should a beginner study Auto Information?

Start with the job of each vehicle system: engine, fuel, ignition, cooling, lubrication, starting, charging, drivetrain, brakes, steering, suspension, tires, tools, maintenance, and safety. Then practice symptoms and part functions.

What To Study After Automotive Information Practice

Automotive Information overlaps with tools, shop procedure, mechanical reasoning, and basic electrical systems. Use the next page that matches the exact type of miss.

Use the ASVAB Study Guide for test format, timing, and study order.