ASVAB Auto & Shop Information (AS) Practice Exam

ASVAB Auto & Shop Information (AS) Practice Exam 2026

Q001. A tire is labeled P225/60R16. Which number best represents the tire’s aspect ratio (sidewall height as a percent of section width)?

Correct Answer: B
Explanation: In P225/60R16, 225 is section width (mm), 60 is aspect ratio (%), R indicates radial construction, and 16 is wheel diameter (inches).
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: tire size code interpretation (aspect ratio).

Q002. A battery reads 12.6 V with the engine off. With the engine running it reads 12.2 V. The most likely issue is:

Correct Answer: B
Explanation: With the engine running, system voltage should typically be about 13.5–14.7 V. A reading near 12.2 V suggests the alternator/regulator circuit is not charging.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: charging system normal operating voltage.

Q003. A vehicle pulls to the right only during braking, not during cruising. The most likely cause is:

Correct Answer: B
Explanation: A pull that appears only under braking usually indicates unequal braking force, such as a sticking caliper, restricted hose, or contaminated pad/rotor.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake pull diagnosis (uneven braking force).

Q004. A torque wrench is set to 80 ft·lb. Which practice best ensures accuracy?

Correct Answer: C
Explanation: Apply steady force until the torque wrench indicates the set value (click) and then stop. Extensions or jerky pulls can change actual torque; storage at minimum helps calibration.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque wrench proper use (click-stop method).

Q005. A four-stroke engine has low compression on a dry test but compression rises significantly on a wet test. This most strongly suggests a problem with:

Correct Answer: B
Explanation: Oil added during a wet test temporarily improves ring-to-cylinder sealing. If compression rises, worn rings or cylinder wall wear is likely.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: compression vs wet test interpretation (ring sealing).

Q006. An engine misfires only under load and the spark plug gap is much wider than specification. The most direct effect of an excessive plug gap is:

Correct Answer: B
Explanation: A wider gap needs higher ignition voltage. Under load, cylinder pressure is higher and the required voltage increases further, making misfire more likely.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: spark plug gap and ignition voltage requirement.

Q007. A manual-transmission vehicle creeps forward slightly with the clutch pedal fully depressed and the shifter in gear. The most likely condition is:

Correct Answer: B
Explanation: Creeping with the clutch pressed indicates clutch drag—often due to incomplete release from hydraulic issues, misadjustment, or warped friction components.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: clutch disengagement (drag vs slip).

Q008. A cooling system cap is rated at 16 psi. The primary benefit of pressurizing the coolant is to:

Correct Answer: B
Explanation: Higher system pressure raises coolant boiling point, helping prevent vapor pockets and boil-over under high temperature conditions.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: pressure and boiling point relationship.

Q009. A scan tool shows DTC P0171 (system too lean, bank 1). Which condition most directly causes a lean mixture by adding unmetered air?

Correct Answer: B
Explanation: A vacuum leak after the MAF allows air to enter without being measured, causing the PCM to under-fuel relative to actual airflow.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unmetered air causing lean condition (vacuum leak).

Q010. A shop uses a hydraulic floor jack to lift a vehicle. The safest placement for the jack is:

Correct Answer: C
Explanation: Manufacturer jacking points are reinforced to support the vehicle. Lifting on oil pans, exhaust, or random components can damage parts or slip.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: vehicle lifting safety (proper jacking points).

Q011. Brake fluid is rated with a dry boiling point of 446°F and a wet boiling point of 284°F. If a vehicle is used hard on long descents, why is moisture contamination a problem?

Correct Answer: B
Explanation: Brake fluid absorbs moisture. Water lowers the boiling point, so under heavy braking the fluid can boil and form compressible vapor bubbles, causing a soft pedal.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake fluid hygroscopic behavior (wet boiling point).

Q012. Brake fluid is rated with a dry boiling point of 518°F and a wet boiling point of 311°F. If a vehicle is used hard on long descents, why is moisture contamination a problem?

Q013. A gearset has a 12-tooth drive gear turning a 36-tooth driven gear. The speed ratio (driven speed / drive speed) is closest to:

Correct Answer: A
Explanation: For meshed gears, speed is inversely proportional to tooth count: driven/drive = N_drive/N_driven.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear speed ratio (inverse of tooth count).

Q014. A gearset has a 18-tooth drive gear turning a 30-tooth driven gear. The speed ratio (driven speed / drive speed) is closest to:

Q015. A gearset has a 20-tooth drive gear turning a 50-tooth driven gear. The speed ratio (driven speed / drive speed) is closest to:

Q016. A wheel bearing noise gets louder when turning left and quieter when turning the opposite way. Which side is most likely loaded and therefore suspect?

Correct Answer: B
Explanation: Turning left transfers load to the right side. A worn bearing often gets louder when loaded.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: load transfer and bearing noise diagnosis.

Q017. A wheel bearing noise gets louder when turning right and quieter when turning the opposite way. Which side is most likely loaded and therefore suspect?

Correct Answer: A
Explanation: Turning right transfers load to the left side. A worn bearing often gets louder when loaded.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: load transfer and bearing noise diagnosis.

Q018. In basic MIG welding on mild steel using solid wire with shielding gas, which polarity setup is most typical?

Correct Answer: B
Explanation: For GMAW (MIG) with solid wire and shielding gas, DCEP is commonly used for stable arc characteristics and good penetration.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: MIG welding polarity convention (DCEP).

Q019. To measure current draw with a multimeter on a circuit, the meter must be connected:

Correct Answer: B
Explanation: Current measurement requires the meter to be in series so the same current flowing in the circuit flows through the meter’s shunt.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: ammeter connection (series measurement).

Q020. A radiator hose begins to seep after service. The clamp was tightened heavily. Why can over-tightening a hose clamp cause a leak?

Correct Answer: B
Explanation: Excess clamp force can damage the hose or distort sealing surfaces, preventing uniform compression and allowing coolant to seep.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hose clamp force vs hose sealing integrity.

Q021. On many interference engines, a snapped timing belt most directly risks:

Correct Answer: B
Explanation: In interference designs, piston and valve paths overlap at different times. Loss of timing can allow contact, bending valves or damaging pistons.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: interference engine timing failure consequences.

Q022. Excessive negative camber on one wheel most commonly results in:

Correct Answer: B
Explanation: Negative camber tilts the top of the tire inward, increasing load on the inner tread and accelerating inner-edge wear.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: camber angle and tire wear pattern.

Q023. If front toe is significantly out of specification (toe-in or toe-out), the most common tread wear pattern is:

Correct Answer: C
Explanation: Incorrect toe causes lateral scrubbing as the tires roll, producing feathered edges across tread blocks.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: toe setting and feathered tire wear.

Q024. A work light has an effective resistance of 60 Ω. If connected to 120 V, the current draw is closest to:

Correct Answer: A
Explanation: Use Ohm’s law: I = V/R. Substitute the values to compute current.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law (I = V/R).

Q025. A work light has an effective resistance of 4 Ω. If connected to 12 V, the current draw is closest to:

Q026. A shop press applies 3000 lb of force on a ram with piston area 2.50 in². The hydraulic pressure is closest to:

Correct Answer: A
Explanation: Pressure equals force divided by area: P = F/A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure (P = F/A).

Q027. A shop press applies 1200 lb of force on a ram with piston area 0.75 in². The hydraulic pressure is closest to:

Correct Answer: A
Explanation: Pressure equals force divided by area: P = F/A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure (P = F/A).

Q028. A mechanic applies 75 lb of force at the end of a 2.0-ft breaker bar. The applied torque is closest to:

Correct Answer: A
Explanation: Torque is force times perpendicular lever arm length: T = F × r.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque relationship (T = F×lever arm).

Q029. A mechanic applies 40 lb of force at the end of a 1.5-ft breaker bar. The applied torque is closest to:

Q030. A vehicle owner switches from 5W-30 to 20W-50 in cold weather. The most likely immediate effect during a cold start is:

Correct Answer: B
Explanation: Higher-viscosity oil flows more slowly when cold, increasing pumping effort and potentially delaying lubrication to bearings.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: oil viscosity vs temperature (cold-start flow).

Q031. A persistent engine misfire that allows unburned fuel into the exhaust most directly risks damaging the catalytic converter by:

Correct Answer: B
Explanation: Unburned fuel can ignite in the catalyst, driving temperatures high enough to melt or damage the converter substrate.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: misfire impact on catalytic converter (thermal damage).

Q032. Short-term fuel trim (STFT) on a scan tool primarily represents:

Correct Answer: B
Explanation: STFT shows immediate PCM corrections based on oxygen sensor feedback to keep the air-fuel mixture near the target.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: closed-loop fuel control (fuel trim feedback).

Q033. A steering wheel shake occurs mainly during braking from highway speeds. One of the most direct mechanical causes is excessive:

Correct Answer: B
Explanation: Rotor runout or thickness variation can create pulsating brake torque, transmitting vibration through the steering system during braking.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake rotor runout/thickness variation and brake judder.

Q034. When selecting a replacement bolt for a metric fastener, thread pitch refers to:

Correct Answer: B
Explanation: Metric thread pitch is the distance (mm) between thread crests (e.g., M10×1.25 has 1.25 mm pitch).
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: metric thread pitch definition.

Q035. An engine exhibits spark knock (pinging) under acceleration. A common cause is ignition timing that is:

Correct Answer: A
Explanation: Over-advanced timing can raise peak cylinder pressure too early, increasing the tendency for detonation under load.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: ignition timing and detonation risk.

Q036. A starter solenoid clicks rapidly but the engine does not crank. The most likely cause is:

Correct Answer: B
Explanation: Rapid clicking often indicates the solenoid engages but voltage collapses under load due to a weak battery or high-resistance connections.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: starter circuit voltage drop under load.

Q037. A technician back-probes a connector to test a sensor signal. Which practice best prevents terminal damage?

Correct Answer: C
Explanation: Using a thin back-probe pin minimizes terminal spreading. Forcing large probes can deform terminals and cause intermittent faults.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: electrical testing technique (connector terminal integrity).

Q038. On a disc brake, one pad is much thinner than the other pad on the same caliper. This most commonly indicates:

Correct Answer: B
Explanation: Uneven pad wear across a caliper often results from seized slide pins or a piston that does not move freely.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: disc brake hardware function (caliper slide/piston movement).

Q039. A torque-to-yield (TTY) bolt differs from a standard bolt because it is designed to:

Correct Answer: B
Explanation: TTY bolts are tightened into controlled stretch (often by torque-plus-angle) for consistent clamping, and are commonly one-time-use.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque-to-yield bolt controlled plastic deformation.

Q040. An automatic transmission slips mainly after the vehicle is fully warmed up. A likely contributing factor is:

Correct Answer: A
Explanation: Low or degraded ATF can reduce hydraulic pressure and friction performance; symptoms often worsen when hot because the fluid thins.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: automatic transmission hydraulic pressure and fluid condition.

Q041. A technician uses an incandescent test light on a low-current sensor circuit and the engine stalls. The best explanation is:

Correct Answer: B
Explanation: Incandescent test lights can draw enough current to load or disrupt sensitive circuits. High-impedance meters are preferred for electronics.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: circuit loading from test equipment (low-current circuits).

Q042. A brake pedal feels firm with the engine off, but sinks when the engine starts. This is most consistent with:

Correct Answer: A
Explanation: When vacuum assist becomes available, the same foot force produces more assist, allowing the pedal to travel further—this is normal behavior.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: vacuum brake booster assist effect.

Q043. A heater blows cool air at idle but warms when driving. A common cause is:

Correct Answer: B
Explanation: At idle, coolant flow can be lower. Low coolant or poor circulation may limit hot coolant through the heater core until RPM increases.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: heater performance vs coolant flow and coolant level.

Q044. A serpentine belt squeals briefly on a cold start and then quiets. The most likely cause is:

Correct Answer: B
Explanation: Cold belts can slip more if tension is low or the belt is glazed/contaminated, producing brief squeal until conditions stabilize.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: belt friction and tension (slip-induced noise).

Q045. Power steering makes a whining noise that increases with steering effort. The most likely cause is:

Correct Answer: A
Explanation: Whining with steering load commonly indicates pump cavitation from low fluid or air in the system.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: power steering pump cavitation (aeration/low fluid).

Q046. A narrowband upstream oxygen sensor voltage is stuck near 0.1 V in closed loop. The most likely interpretation is:

Correct Answer: B
Explanation: On narrowband sensors, low voltage generally corresponds to lean exhaust oxygen content; a cold/unheated sensor can also read low.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: narrowband oxygen sensor voltage interpretation.

Q047. A technician tightens lug nuts with an impact wrench and later the customer reports brake pulsation. A best-practice prevention step is to:

Correct Answer: B
Explanation: Even, correct lug torque helps avoid hub/rotor distortion. Final torque with a torque wrench in a star pattern improves uniform clamping.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: wheel lug torque procedure (even clamping).

Q048. An ABS warning light is on due to a wheel speed sensor fault. In most vehicles, base braking will:

Correct Answer: B
Explanation: ABS faults generally disable anti-lock function but retain conventional hydraulic braking.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: ABS fail-safe operation (base brakes remain).

Q049. A customer asks about removing the engine air filter to improve MPG. The correct explanation is:

Correct Answer: B
Explanation: Modern engines meter airflow. Removing the filter can allow abrasive dirt into the engine and does not guarantee improved fuel economy.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: intake filtration purpose and metered airflow.

Q050. Battery terminals have heavy white/blue buildup. The most appropriate first step is to:

Correct Answer: B
Explanation: Corrosion increases resistance and causes starting/charging issues. Cleaning and protecting terminals addresses the common root cause.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery terminal corrosion and circuit resistance.

Q051. A voltage drop test shows 0.6 V drop on the positive battery cable while cranking. This indicates:

Correct Answer: B
Explanation: Large voltage drop under load indicates high resistance in the cable/connection, reducing voltage available to the starter.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load (high resistance diagnosis).

Q052. A micrometer is preferred over a ruler for measuring brake rotor thickness because it provides:

Correct Answer: B
Explanation: Rotor thickness variation can be small; micrometers provide fine resolution and consistent measurement.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: precision measurement tools (micrometer vs ruler).

Q053. A drill bit marked ‘HSS’ is best described as:

Correct Answer: B
Explanation: HSS stands for high-speed steel, a common drill-bit material that retains hardness at higher temperatures.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: tool material identification (HSS).

Q054. A ‘medium strength’ threadlocker is typically selected when you want fasteners to:

Correct Answer: B
Explanation: Medium-strength threadlocker helps prevent loosening from vibration but is designed for removal with typical hand tools.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: threadlocker function and strength selection.

Q055. A brake pedal pulses but the steering wheel does not shake. This pattern is most consistent with an issue that could be at:

Correct Answer: B
Explanation: Pedal pulsation can come from variation at any brake. Steering shake is more commonly tied to front brake torque variation transmitted through steering components.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake pulsation vs steering shake diagnostic separation.

Q056. A coolant mixture is 70% antifreeze and 30% water. Compared with 50/50, a likely drawback is:

Correct Answer: B
Explanation: Too much antifreeze can reduce heat transfer efficiency, sometimes raising operating temperatures even if freeze protection changes.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: coolant concentration vs heat transfer efficiency.

Q057. The engine cranks but will not start, and a tachometer that normally flickers shows no movement during cranking. A likely cause is:

Correct Answer: A
Explanation: Many systems use the crank sensor for RPM input. No RPM signal can prevent spark/injection commands, causing a no-start.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: crankshaft position signal importance for spark/injection.

Q058. A technician chooses 80-grit sandpaper instead of 220-grit because 80-grit will:

Correct Answer: A
Explanation: Lower grit numbers are coarser, remove material faster, and leave a rougher surface compared with higher grits.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: abrasive grit size vs material removal rate.

Q059. A vibration appears around 65 mph but not at 35 mph. A common first suspect is:

Correct Answer: B
Explanation: Speed-related vibrations often originate from rotating components. Tire/wheel imbalance commonly becomes noticeable at higher speeds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: rotational imbalance and speed-related vibration.

Q060. A pry bar is used to check ball joint play. The purpose is to identify:

Correct Answer: B
Explanation: Ball joints with excessive play can alter wheel geometry and cause wandering, clunks, and uneven tire wear.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: suspension joint wear (clearance and handling effects).

Q061. A fuel pump relay has burned, resistive contacts. The most likely symptom is:

Correct Answer: B
Explanation: High resistance in relay contacts reduces voltage to the pump under load, lowering pump speed and fuel pressure/volume.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: relay contact resistance causing voltage drop.

Q062. To diagnose a parasitic battery drain, the correct initial meter setup is to:

Correct Answer: B
Explanation: Parasitic draw is current leaving the battery with the vehicle off, so the ammeter must be placed in series with the battery circuit.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: parasitic draw testing (ammeter in series).

Q063. A thermostat stuck open will most likely cause the engine to:

Correct Answer: A
Explanation: A stuck-open thermostat allows continuous radiator flow, slowing warm-up and often keeping temperatures below the designed operating range.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: thermostat function (temperature regulation).

Q064. A technician measures 14.4 V at the alternator output stud but only 13.6 V at the battery. A most likely cause is:

Correct Answer: B
Explanation: A difference between alternator and battery voltage under load indicates resistance in the charging circuit, such as corroded connections or fusible links.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: charging circuit voltage drop diagnosis.

Q065. A 6-point socket is preferred over a 12-point socket on a rusty fastener because a 6-point socket:

Correct Answer: B
Explanation: Six-point sockets grip the flats more fully, reducing the tendency to round corners on corroded fasteners.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: socket selection (contact area and rounding prevention).

Q066. A high idle is suspected to be caused by an intake leak. Spraying a flammable cleaner near the intake gasket changes RPM. This most strongly indicates:

Correct Answer: B
Explanation: RPM change indicates the engine is drawing the spray in through a leak, briefly enriching the mixture and altering idle speed.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: vacuum leak detection via enrichment response.

Q067. A brake caliper piston is difficult to compress during pad replacement. Before forcing it, the technician should first:

Correct Answer: A
Explanation: If fluid cannot return due to restriction or a closed path, the piston resists compression. Providing a return path and checking for restrictions prevents damage.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic brake caliper retraction (fluid return path).

Q068. A dial indicator used on a brake rotor is primarily measuring:

Correct Answer: B
Explanation: Dial indicators measure small deviations such as rotor runout, which can contribute to brake pulsation and judder.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: dial indicator use (runout measurement).

Q069. A feeler gauge is used to measure:

Correct Answer: B
Explanation: Feeler gauges provide known thickness blades used to check or set precise clearances such as valve lash.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: feeler gauge function (clearance measurement).

Q070. A/C low-side pressure is very low and the compressor cycles rapidly. A common cause is:

Correct Answer: B
Explanation: Low refrigerant can trigger low-pressure cycling, causing rapid compressor cycling and poor cooling performance.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: A/C system pressure behavior (low refrigerant charge).

Q071. An aluminum oil pan drain plug strips threads during tightening. The best prevention is to:

Correct Answer: B
Explanation: Hand-starting avoids cross-threading and correct torque prevents stripping softer aluminum threads.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: thread engagement and torque on soft metals.

Q072. A ‘clunk’ occurs when shifting from reverse to drive. A common drivetrain-related cause is excessive:

Correct Answer: B
Explanation: Worn U-joints, mounts, or driveline lash can produce a clunk as torque reverses and slack is taken up.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: driveline lash/backlash and shift clunk.

Q073. When pressing a bearing into a housing, which practice reduces the risk of bearing damage?

Correct Answer: B
Explanation: Press force should be applied to the race with the interference fit. Pressing through rolling elements can brinell the bearing and cause early failure.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: bearing installation (press force through correct race).

Q074. Engine oil appears milky. A likely cause is:

Correct Answer: B
Explanation: Milky oil commonly indicates coolant or water mixed with oil, often from a head gasket failure or oil cooler leak.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fluid contamination identification (oil + coolant emulsification).

Q075. The EVAP system’s primary purpose is to:

Correct Answer: B
Explanation: EVAP captures fuel vapors in a charcoal canister and later purges them into the engine to be burned, reducing vapor emissions.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: EVAP emissions control (vapor capture and purge).

Q076. A fuel smell and an EVAP leak code are present. One common cause that can allow vapor escape is a:

Correct Answer: A
Explanation: A loose or failed cap seal can leak vapors and trigger EVAP leak codes while producing fuel odor.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: EVAP leak sources (fuel cap seal).

Q077. A shop area includes gasoline and energized electrical equipment. The most appropriate general extinguisher rating is:

Correct Answer: C
Explanation: Class B covers flammable liquids and Class C covers energized electrical equipment. Many shop units are rated B/C or A/B/C.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fire extinguisher classes (B for liquids, C for electrical).

Q078. Brake lights stay on even when the pedal is not pressed. A common cause is a:

Correct Answer: B
Explanation: The brake light circuit is controlled by a pedal switch. If it is misadjusted or stuck, it can keep the lights on continuously.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake light circuit control (pedal switch function).

Q079. Work-hardening during metal forming means the metal becomes:

Correct Answer: B
Explanation: Plastic deformation increases dislocations, which raises hardness and reduces ductility—this is work hardening.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: material behavior under plastic deformation (work hardening).

Q080. A headlight shows 12.0 V at the connector unplugged, but drops to 8.5 V when the bulb is plugged in. This strongly suggests:

Correct Answer: B
Explanation: Open-circuit readings can look normal. Under load, high resistance causes significant voltage drop, lowering voltage available to the bulb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: loaded circuit voltage drop (high resistance fault).

Q081. A 4-wire heated oxygen sensor includes extra wires primarily for the:

Correct Answer: B
Explanation: Heated O2 sensors use a heater element to reach operating temperature quickly; the extra wires supply and ground the heater.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: heated oxygen sensor design (heater circuit).

Q082. While grinding metal, the safest eye protection is:

Correct Answer: B
Explanation: Grinding produces high-velocity particles. Proper rated eye protection (often combined with a face shield) is required.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: shop safety PPE (eye protection for grinding).

Q083. A ‘high impedance’ fuel injector typically has:

Correct Answer: A
Explanation: High-impedance injectors have higher coil resistance, so they draw less current at a given voltage than low-impedance injectors.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: injector electrical characteristics (impedance and current).

Q084. A vacuum bleeder’s key advantage for brake bleeding is that it:

Correct Answer: B
Explanation: Vacuum bleeding draws fluid through the system, removing air without repeated pedal pumping and reducing the risk of aerating fluid.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake bleeding methods (vacuum bleeding principle).

Q085. Idle control (IAC or electronic throttle) is primarily responsible for:

Correct Answer: B
Explanation: Idle control adjusts airflow at closed throttle to keep idle steady despite accessory loads like A/C and steering.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: idle speed control (airflow regulation at idle).

Q086. A battery is rated at 650 CCA. ‘CCA’ most directly refers to the battery’s ability to:

Correct Answer: A
Explanation: Cold Cranking Amps (CCA) measures how much current a battery can deliver at 0°F for a specified time while staying above a minimum voltage—important for cold starts.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery cold cranking rating (CCA definition).

Q087. A vehicle’s rear differential has a limited-slip unit that chatters in turns after a fluid change. A common fix is to:

Correct Answer: B
Explanation: Many limited-slip differentials require friction modifier additives to prevent clutch chatter and ensure smooth engagement.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: limited-slip differential friction modifier use.

Q088. A technician is selecting sockets for a tight fastener. Using an SAE socket on a metric fastener primarily increases the risk of:

Correct Answer: B
Explanation: Near-size mismatches reduce contact area and can slip under torque, rounding corners—especially on corroded fasteners.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fastener-tool fit (proper socket sizing).

Q089. A tire rotation is performed to even out wear. On many front-wheel-drive cars with non-directional tires, a common rotation pattern is:

Correct Answer: B
Explanation: A common FWD pattern is ‘forward cross’: fronts cross to the rear, and rears move straight forward (for non-directional tires).
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: tire rotation patterns (forward cross on FWD).

Q090. A vehicle’s A/C compressor clutch does not engage, but the system has correct refrigerant charge and pressure switches test good. A direct next electrical check is to verify:

Correct Answer: B
Explanation: If control logic and pressure inputs are OK, confirm the clutch is receiving power and ground when commanded. Lack of voltage/ground points to wiring, relay, or control output issues.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: A/C clutch circuit verification (power/ground under command).

Q091. A vehicle has poor power and a scan shows unusually high long-term fuel trim (adding fuel). One possible mechanical cause that can force the PCM to add fuel is:

Correct Answer: B
Explanation: If fuel delivery is restricted (filter/pump), the mixture goes lean and trims rise as the PCM commands more fuel to compensate.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fuel delivery restriction causing lean condition (fuel trim response).

Q092. A technician uses a bore gauge to measure cylinder diameter. The primary reason is to check for:

Correct Answer: B
Explanation: Cylinder wear can produce taper and out-of-round conditions that affect sealing and compression. Bore gauges measure diameter accurately at multiple depths/orientations.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: cylinder bore measurement (taper/out-of-round).

Q093. A shop air regulator is set too high for a pneumatic tool. The most likely consequence is:

Correct Answer: B
Explanation: Excess air pressure can overspeed or overload pneumatic tools, increasing wear or causing unsafe failures. Tools have rated pressure specifications.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: pneumatic tool operating pressure limits.

Q094. A technician places a vehicle on jack stands. The most critical safety rule is to:

Correct Answer: B
Explanation: Jack stands must contact strong structural points (frame/pinch welds) and the vehicle must be checked for stability. A hydraulic jack alone is not a safe support.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: vehicle support safety (jack stands and stability).

Q095. When welding or grinding in a shop, which PPE combination best reduces both eye injury and inhalation risk?

Correct Answer: B
Explanation: Eye protection prevents injury from sparks and debris, while respirators reduce inhalation of particulate and fumes produced during grinding/welding.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: shop PPE selection (eye and respiratory protection).

Q096. A vehicle shows ABS activation at low speed on dry pavement with no wheel lock. A common cause is:

Correct Answer: A
Explanation: A damaged or dirty tone ring can create erratic speed signals, tricking the ABS into thinking a wheel is slowing too fast and causing unnecessary activation.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: ABS wheel speed sensor signal integrity (tone ring faults).

Q097. A spark plug ‘heat range’ primarily describes the plug’s ability to:

Correct Answer: B
Explanation: Heat range relates to how quickly heat is conducted away from the firing tip. Too hot can cause pre-ignition; too cold can foul.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: spark plug heat range (thermal conduction).

Q098. A vehicle’s cooling fans run constantly and the scan tool shows coolant temperature reading implausibly low. A common explanation is:

Correct Answer: B
Explanation: If the PCM sees an implausible temperature signal, it may run fans as a fail-safe to prevent overheating when sensor data is unreliable.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: sensor failure fail-safe strategies (ECT and fan control).

Q099. A technician suspects an exhaust restriction. A classic symptom under load is:

Correct Answer: B
Explanation: A restricted exhaust increases backpressure, limiting airflow. Power loss typically becomes more severe with higher load and RPM demand.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: exhaust backpressure and engine power limitation.

Q100. A proportioning valve in a brake system is primarily intended to:

Correct Answer: B
Explanation: Because weight shifts forward during braking, rear wheels can lock first. Proportioning limits rear pressure to improve stability.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake proportioning and weight transfer.

Q101. A tread depth gauge reads 3/32 inch on a tire. If replacement is recommended at 2/32 inch and wear is about 1/32 per 6,000 miles, about how many miles remain before reaching 2/32?

Correct Answer: C
Explanation: From 3/32 to 2/32 is 1/32 of wear. At 1/32 per 6,000 miles, that is about 6,000 miles remaining.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: tread depth measurement and linear wear estimation.

Q102. A fuel injector coil measures 2.4 Ω. With a 12 V supply, the estimated current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 12/2.4 = 5.0 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current estimation (I = V/R).

Q103. A brake pedal is firm, but stopping distance is longer than expected. Pads and rotors appear serviceable. Which condition most directly explains a long stop with a firm pedal?

Correct Answer: B
Explanation: A firm pedal indicates hydraulic pressure is being generated. Long stops with firm pedal often indicate reduced friction at the pads/rotors or reduced tire traction.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: braking distance vs friction/traction (hydraulics vs deceleration).

Q104. Battery voltage is 12.4 V, but with headlights on the measured voltage at the bulb is 10.8 V. This most strongly indicates:

Correct Answer: B
Explanation: A large difference between source voltage and load voltage under operation indicates voltage drop from resistance in the power or ground path.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load (distribution circuit resistance).

Q105. Oil pressure is normal when cold but becomes very low at full operating temperature. A likely cause is:

Correct Answer: B
Explanation: Hot oil has lower viscosity. If clearances are excessive or oil is too thin, pressure can drop significantly when hot.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: oil viscosity and clearance effects on pressure.

Q106. A key-off parasitic draw stabilizes at 0.30 A after modules sleep. If 30 Ah is drained, approximately how long will that take?

Correct Answer: C
Explanation: Time = Ah/A = 30/0.30 = 100 hours (about 4 days).
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity vs parasitic current (Ah relationship).

Q107. A torque spec calls for 25 ft·lb plus an additional 90° turn. The best tool or method for the 90° portion is:

Correct Answer: B
Explanation: Torque-plus-angle tightening requires controlling rotation. An angle gauge or marked reference allows accurate additional degrees.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque-plus-angle tightening technique.

Q108. A clamp is overtightened on a rubber hose. Why can this create a leak even if the clamp feels ‘tight’?

Correct Answer: B
Explanation: Excessive clamp force can damage or deform the hose, creating channels for seepage instead of a uniform seal.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: seal integrity vs clamp force (material deformation).

Q109. A wheel bearing hum gets louder when turning left and quieter when turning right. The most likely bad bearing is on the:

Correct Answer: B
Explanation: Turning left transfers load to the right side. A worn bearing typically gets louder when loaded.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: load transfer principle for bearing noise diagnosis.

Q110. A disc brake has one pad worn much more than the other on the same caliper. This most commonly indicates:

Correct Answer: B
Explanation: Caliper slides and piston must move freely. Sticking hardware causes uneven pad pressure and uneven wear.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: caliper hardware movement and pad wear.

Q111. A mechanic uses a 6-point socket instead of a 12-point socket on a rusty bolt mainly to:

Correct Answer: B
Explanation: Six-point sockets grip the flats more fully and are less likely to round corroded fasteners.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: socket contact area and rounding prevention.

Q112. Feathered, sawtooth tread wear across a tire is most commonly caused by incorrect:

Correct Answer: B
Explanation: Toe misalignment causes lateral scrubbing as the tire rolls, creating feathered edges across tread blocks.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: toe setting and feathered wear.

Q113. A narrowband upstream O2 sensor is stuck near 0.9 V in closed loop. This most commonly indicates:

Correct Answer: B
Explanation: Narrowband sensors output higher voltage under rich conditions (low oxygen in exhaust).
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: narrowband O2 sensor voltage interpretation (rich/lean).

Q114. A technician wants to measure current draw on a circuit. The ammeter must be connected:

Correct Answer: B
Explanation: An ammeter must be placed in series so all circuit current flows through the meter.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: ammeter series connection principle.

Q115. Brake fluid absorbs moisture over time. The main performance risk of moisture contamination is:

Correct Answer: B
Explanation: Water lowers brake fluid boiling point. Under heavy braking, boiling can create vapor bubbles that compress and soften the pedal.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake fluid hygroscopic nature and wet boiling point.

Q116. A hard brake pedal with high effort but still functional braking most commonly indicates:

Correct Answer: A
Explanation: Loss of booster assist increases required pedal force while base hydraulics still work.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: vacuum assist loss and pedal effort relationship.

Q117. A fuse test light illuminates on one side of the fuse but not the other. This indicates:

Correct Answer: B
Explanation: Power on only one side means the fuse element is open and not passing current.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fuse testing interpretation (power on one side only).

Q118. A vacuum gauge shows a normal reading that slowly drops toward zero as RPM is held steady. This pattern is consistent with:

Correct Answer: A
Explanation: With restriction, backpressure builds and manifold vacuum drops under sustained flow demand.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: manifold vacuum pattern indicating exhaust restriction.

Q119. A missing wheel weight most commonly causes:

Correct Answer: B
Explanation: Wheel balance issues typically produce vibration that increases with road speed.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: wheel/tire balance and vibration relationship.

Q120. A battery cable end is greenish and powdery. Electrically, this condition tends to cause:

Correct Answer: B
Explanation: Corrosion reduces conductive area and increases resistance, causing voltage drop especially under high current.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: corrosion increasing contact resistance.

Q121. A shop press applies 3000 lb of force on a ram area of 2.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 3000/2.5 ≈ 1200 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q122. A service manual lists a torque of 135 N·m. Using 1 N·m ≈ 0.7376 ft·lb, this is closest to:

Correct Answer: C
Explanation: 135×0.7376 ≈ 99.6 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unit conversion (N·m to ft·lb).

Q123. A mechanic applies 30 lb of force at the end of a 1.8 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 30×1.8 ≈ 54 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q124. A service manual lists a torque of 95 N·m. Using 1 N·m ≈ 0.7376 ft·lb, this is closest to:

Correct Answer: C
Explanation: 95×0.7376 ≈ 70.1 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unit conversion (N·m to ft·lb).

Q125. A service manual lists a torque of 160 N·m. Using 1 N·m ≈ 0.7376 ft·lb, this is closest to:

Correct Answer: C
Explanation: 160×0.7376 ≈ 118.0 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unit conversion (N·m to ft·lb).

Q126. A mechanic applies 75 lb of force at the end of a 2.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 75×2.0 ≈ 150 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q127. A shop press applies 3000 lb of force on a ram area of 3.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 3000/3.0 ≈ 1000 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q128. A shop press applies 2400 lb of force on a ram area of 1.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 2400/1.5 ≈ 1600 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q129. A shop press applies 1200 lb of force on a ram area of 2.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1200/2.0 ≈ 600 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q130. A circuit has 13.8 V applied across a load measuring 10 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/10 ≈ 1.38 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q131. Battery voltage is 12.4 V, but the voltage measured at a load while operating is 10.5 V. The most likely explanation is:

Correct Answer: B
Explanation: A 1.9 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q132. A mechanic applies 75 lb of force at the end of a 1.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 75×1.0 ≈ 75 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q133. A service manual lists a torque of 80 N·m. Using 1 N·m ≈ 0.7376 ft·lb, this is closest to:

Correct Answer: C
Explanation: 80×0.7376 ≈ 59.0 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unit conversion (N·m to ft·lb).

Q134. A mechanic applies 50 lb of force at the end of a 2.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 50×2.0 ≈ 100 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q135. Battery voltage is 13.0 V, but the voltage measured at a load while operating is 10.8 V. The most likely explanation is:

Correct Answer: B
Explanation: A 2.2 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q136. A circuit has 13.8 V applied across a load measuring 1.5 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/1.5 ≈ 9.2 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q137. A shop press applies 3000 lb of force on a ram area of 1.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 3000/1.5 ≈ 2000 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q138. Battery voltage is 12.4 V, but the voltage measured at a load while operating is 11.0 V. The most likely explanation is:

Correct Answer: B
Explanation: A 1.4 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q139. A circuit has 24 V applied across a load measuring 24 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/24 ≈ 1 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q140. A service manual lists a torque of 110 N·m. Using 1 N·m ≈ 0.7376 ft·lb, this is closest to:

Correct Answer: C
Explanation: 110×0.7376 ≈ 81.1 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unit conversion (N·m to ft·lb).

Q141. A circuit has 120 V applied across a load measuring 48 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 120/48 ≈ 2.5 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q142. A mechanic applies 50 lb of force at the end of a 1.8 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 50×1.8 ≈ 90 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q143. A mechanic applies 30 lb of force at the end of a 1.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 30×1.0 ≈ 30 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q144. Battery voltage is 12.6 V, but the voltage measured at a load while operating is 10.8 V. The most likely explanation is:

Correct Answer: B
Explanation: A 1.8 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q145. A service manual lists a torque of 200 N·m. Using 1 N·m ≈ 0.7376 ft·lb, this is closest to:

Correct Answer: C
Explanation: 200×0.7376 ≈ 147.5 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: unit conversion (N·m to ft·lb).

Q146. A circuit has 13.8 V applied across a load measuring 6 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/6 ≈ 2.3 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q147. A shop press applies 1200 lb of force on a ram area of 3.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1200/3.0 ≈ 400 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q148. A circuit has 24 V applied across a load measuring 4 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/4 ≈ 6 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q149. Battery voltage is 12.6 V, but the voltage measured at a load while operating is 11.0 V. The most likely explanation is:

Correct Answer: B
Explanation: A 1.6 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q150. A circuit has 12 V applied across a load measuring 12 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 12/12 ≈ 1 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q151. A mechanic applies 60 lb of force at the end of a 1.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 60×1.5 ≈ 90 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q152. A circuit has 24 V applied across a load measuring 8 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/8 ≈ 3 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q153. Battery voltage is 12.4 V, but the voltage measured at a load while operating is 11.4 V. The most likely explanation is:

Correct Answer: B
Explanation: A 1.0 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q154. Battery voltage is 13.0 V, but the voltage measured at a load while operating is 10.5 V. The most likely explanation is:

Correct Answer: B
Explanation: A 2.5 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q155. Battery voltage is 12.4 V, but the voltage measured at a load while operating is 10.8 V. The most likely explanation is:

Q156. A circuit has 120 V applied across a load measuring 1.5 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 120/1.5 ≈ 80 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q157. A shop press applies 1200 lb of force on a ram area of 1.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1200/1.5 ≈ 800 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q158. A circuit has 13.8 V applied across a load measuring 3 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/3 ≈ 4.6 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q159. A circuit has 12 V applied across a load measuring 24 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 12/24 ≈ 0.5 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q160. Battery voltage is 12.6 V, but the voltage measured at a load while operating is 10.5 V. The most likely explanation is:

Correct Answer: B
Explanation: A 2.1 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q161. A circuit has 13.8 V applied across a load measuring 8 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/8 ≈ 1.73 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q162. A mechanic applies 40 lb of force at the end of a 1.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 40×1.0 ≈ 40 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q163. A mechanic applies 30 lb of force at the end of a 1.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 30×1.5 ≈ 45 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q164. Battery voltage is 12.6 V, but the voltage measured at a load while operating is 11.4 V. The most likely explanation is:

Correct Answer: B
Explanation: A 1.2 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q165. A mechanic applies 40 lb of force at the end of a 1.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 40×1.5 ≈ 60 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q166. A shop press applies 2400 lb of force on a ram area of 3.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 2400/3.0 ≈ 800 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q167. A shop press applies 3600 lb of force on a ram area of 1.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 3600/1.5 ≈ 2400 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q168. A circuit has 12 V applied across a load measuring 2 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 12/2 ≈ 6 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q169. A circuit has 24 V applied across a load measuring 2 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/2 ≈ 12 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q170. A shop press applies 3600 lb of force on a ram area of 3.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 3600/3.0 ≈ 1200 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q171. A mechanic applies 60 lb of force at the end of a 2.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 60×2.5 ≈ 150 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q172. A mechanic applies 75 lb of force at the end of a 1.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 75×1.5 ≈ 112 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q173. Battery voltage is 13.0 V, but the voltage measured at a load while operating is 11.4 V. The most likely explanation is:

Q174. A shop press applies 1800 lb of force on a ram area of 2.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1800/2.5 ≈ 720 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q175. A circuit has 12 V applied across a load measuring 2.4 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 12/2.4 ≈ 5 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q176. A mechanic applies 40 lb of force at the end of a 1.8 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 40×1.8 ≈ 72 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q177. A circuit has 24 V applied across a load measuring 10 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/10 ≈ 2.4 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q178. A circuit has 13.8 V applied across a load measuring 2.4 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/2.4 ≈ 5.75 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q179. A shop press applies 1800 lb of force on a ram area of 1.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1800/1.5 ≈ 1200 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q180. A circuit has 120 V applied across a load measuring 2.4 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 120/2.4 ≈ 50 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q181. A mechanic applies 30 lb of force at the end of a 2.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 30×2.0 ≈ 60 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q182. A mechanic applies 50 lb of force at the end of a 2.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 50×2.5 ≈ 125 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q183. A mechanic applies 75 lb of force at the end of a 2.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 75×2.5 ≈ 188 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q184. A shop press applies 1800 lb of force on a ram area of 3.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1800/3.0 ≈ 600 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q185. A shop press applies 1200 lb of force on a ram area of 2.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1200/2.5 ≈ 480 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q186. A mechanic applies 50 lb of force at the end of a 1.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 50×1.5 ≈ 75 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q187. A mechanic applies 40 lb of force at the end of a 2.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 40×2.5 ≈ 100 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q188. A shop press applies 2400 lb of force on a ram area of 2.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 2400/2.5 ≈ 960 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q189. A circuit has 13.8 V applied across a load measuring 48 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 13.8/48 ≈ 0.288 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q190. A mechanic applies 40 lb of force at the end of a 2.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 40×2.0 ≈ 80 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q191. A circuit has 120 V applied across a load measuring 2 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 120/2 ≈ 60 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q192. Battery voltage is 13.0 V, but the voltage measured at a load while operating is 11.0 V. The most likely explanation is:

Correct Answer: B
Explanation: A 2.0 V difference under load indicates voltage drop from resistance in wiring, connectors, or grounds.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: voltage drop under load due to resistance.

Q193. A circuit has 24 V applied across a load measuring 48 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/48 ≈ 0.5 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q194. A circuit has 120 V applied across a load measuring 3 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 120/3 ≈ 40 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q195. A mechanic applies 50 lb of force at the end of a 1.0 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 50×1.0 ≈ 50 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q196. A shop press applies 3600 lb of force on a ram area of 2.5 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 3600/2.5 ≈ 1440 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q197. A shop press applies 1800 lb of force on a ram area of 2.0 in². The hydraulic pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 1800/2.0 ≈ 900 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q198. A mechanic applies 75 lb of force at the end of a 1.8 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 75×1.8 ≈ 135 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q199. A circuit has 24 V applied across a load measuring 12 Ω. The expected current draw is closest to:

Correct Answer: C
Explanation: Use I = V/R. 24/12 ≈ 2 A.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law current calculation (I = V/R).

Q200. A mechanic applies 30 lb of force at the end of a 2.5 ft breaker bar. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 30×2.5 ≈ 75 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q201. A scan tool shows engine coolant temperature (ECT) stuck at -40°F even after warm-up. A common cause is:

Correct Answer: B
Explanation: -40°F is a typical default value when the sensor circuit is open. The ECM sees no signal and substitutes an extreme low reading.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: sensor circuit default/failure value behavior (open circuit).

Q202. A vehicle’s A/C blows warm at idle but cools noticeably when driving. A likely cause is:

Correct Answer: B
Explanation: At speed, airflow through the condenser increases. If the condenser fan is weak or not working, A/C performance can suffer mainly at idle.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: heat exchange dependence on airflow (condenser cooling).

Q203. A head gasket leak into a cylinder often produces which start-up symptom after sitting overnight?

Correct Answer: B
Explanation: Coolant can seep into a cylinder while parked, causing a brief rough start and steam until the coolant is expelled.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fluid intrusion into combustion chamber and start-up behavior.

Q204. A vehicle has a ‘click, no crank’ condition. Battery tests good and headlights stay bright. The next best check is:

Correct Answer: B
Explanation: If the battery and main power are OK, you need to confirm the start signal reaches the solenoid when the key is turned.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: control circuit verification under command (start signal).

Q205. A technician finds the battery negative terminal clamp cracked and loose. The most direct risk is:

Correct Answer: B
Explanation: A poor battery ground connection can intermittently interrupt power to the entire vehicle, causing stalls or no-start issues.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: primary power/ground connection integrity.

Q206. A drum brake self-adjuster fails to operate. The most likely symptom over time is:

Correct Answer: B
Explanation: As shoes wear and adjustment is not maintained, clearance increases, requiring more pedal travel and reducing brake response.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake shoe-to-drum clearance and self-adjustment.

Q207. A vehicle with power steering makes a groan when the wheel is turned at low speed. A common cause is:

Correct Answer: A
Explanation: Low fluid or air in the system can cause pump noise and groaning, especially at high steering load and low RPM.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pump cavitation/aeration noise.

Q208. A tire shows wear only on both outer edges while the center looks less worn. This pattern most often indicates:

Correct Answer: B
Explanation: Underinflation increases shoulder loading and causes both outer edges to wear more than the center.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: inflation pressure effect on contact patch shape.

Q209. A tire shows wear mainly in the center of the tread. This pattern most often indicates:

Correct Answer: B
Explanation: Overinflation crowns the tire so the center carries more load and wears faster.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: inflation pressure effect on contact patch load distribution.

Q210. A vehicle pulls left only when accelerating, but is straight while coasting. A likely cause is:

Correct Answer: B
Explanation: Acceleration loads the drivetrain and suspension bushings; unequal compliance or axle angles can cause torque steer under power.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque steer from unequal driveline/suspension compliance.

Q211. A knock sensor fault can cause reduced power because the ECM may:

Correct Answer: B
Explanation: Without reliable knock feedback, the ECM may use conservative timing to prevent detonation, reducing power.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: spark timing control and knock protection strategy.

Q212. A vehicle’s brake lights stay on constantly. A common simple cause is:

Correct Answer: B
Explanation: The brake light switch at the pedal can stick or be misadjusted, keeping the circuit energized.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: switch actuation and adjustment in control circuits.

Q213. A serpentine belt tensioner is weak. A common symptom is:

Correct Answer: B
Explanation: A weak tensioner reduces belt grip, allowing slip that causes squeal and poor accessory performance.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: belt tension and frictional power transmission.

Q214. A vehicle’s engine stalls when the steering is turned to full lock at idle. A likely reason is:

Correct Answer: A
Explanation: Full lock increases pump load; if idle control does not raise idle, the engine can stall.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: idle load compensation for accessory demand.

Q215. A battery is rated 60 Ah. If a device draws 1.2 A continuously, the battery would supply about 24 Ah in:

Correct Answer: C
Explanation: Ah used = A×hours. 1.2 A for 20 hours uses 24 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q216. A differential pinion seal leak most directly risks damage because low gear oil can lead to:

Correct Answer: B
Explanation: Gear oil provides lubrication and cooling. Low level increases friction, heat, and wear.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: lubrication and heat management in gear sets.

Q217. A vehicle’s exhaust smells strongly of rotten eggs. A common association is:

Correct Answer: B
Explanation: A sulfur/rotten egg odor can occur when the catalyst is overheating or reacting with sulfur compounds in fuel/exhaust.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: catalyst chemistry and overheating symptoms.

Q218. A coolant mixture is too diluted (too much water). The most direct risk in cold climates is:

Correct Answer: B
Explanation: Insufficient antifreeze raises freeze risk; freezing can crack engine components or radiator.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: coolant freeze protection via antifreeze concentration.

Q219. A coolant mixture is too concentrated (too much antifreeze). A common downside is:

Correct Answer: B
Explanation: Very high antifreeze concentration can reduce heat transfer compared with an appropriate mix.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: coolant concentration effects on heat transfer.

Q220. A vehicle with hydraulic brakes has one caliper bleeding very slowly. A likely cause is:

Correct Answer: B
Explanation: A restriction in the hose or bleeder can prevent normal fluid flow during bleeding and cause brake issues.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fluid flow restriction in hydraulic circuits.

Q221. A wheel bearing that is failing often changes noise when the vehicle is:

Correct Answer: B
Explanation: Bearing noise commonly increases when that side is loaded during a turn due to higher bearing load.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: load-dependent noise behavior in rotating bearings.

Q222. A mechanic uses a torque wrench with an extension that increases lever arm length. If no correction is made, the fastener torque will generally be:

Correct Answer: B
Explanation: Increasing lever arm means more torque is applied for the same wrench setting unless corrected.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: lever arm length effect on applied torque.

Q223. A vehicle’s alternator belt is slipping. A likely observed symptom is:

Correct Answer: B
Explanation: Slip reduces alternator speed and output and often produces squeal, especially with high electrical demand.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: belt slip reducing alternator speed and output.

Q224. A vehicle’s engine cranks normally but has no spark. If the crank sensor signal is missing, the ECM may not:

Correct Answer: B
Explanation: The crank sensor provides timing reference; without it, ignition and often injection are disabled.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: timing reference requirement for spark/injection.

Q225. A vehicle’s fuel pump draws 12 A when new but now draws 18 A with the same supply voltage. This most likely indicates:

Correct Answer: B
Explanation: Higher current draw at the same voltage can reflect increased load or internal wear causing the pump to work harder.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: current draw as indicator of component loading.

Q226. A battery is reading 12.6 V at rest but drops to 9.2 V during cranking. This suggests:

Correct Answer: B
Explanation: Large voltage drop under high load indicates the battery cannot supply current without sagging, often due to internal resistance or low capacity.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery internal resistance and voltage sag under load.

Q227. A radiator fan turns on only when the A/C is selected, not when the engine warms up. A likely cause is:

Correct Answer: B
Explanation: A/C request can command fans regardless of engine temp. If temp-based control fails, the fan may still run with A/C but not on temperature.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: fan control logic (A/C request vs temperature control).

Q228. A vehicle’s heater blows cold even though the engine is up to temperature. One likely cause is:

Correct Answer: A
Explanation: Cabin heat requires hot coolant flowing through the heater core; blockage or air can stop heat transfer.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: heat transfer requires fluid flow through heater core.

Q229. A brake rotor is measured with a micrometer and varies in thickness around the rotor. This can cause:

Correct Answer: B
Explanation: Thickness variation creates brake torque variation as the pads clamp, felt as pulsation.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: brake torque variation from rotor thickness variation.

Q230. A vehicle’s alignment printout shows excessive negative camber. A common wear pattern is:

Correct Answer: B
Explanation: Negative camber tilts the top inward, loading the inner tread more, causing inner-edge wear.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: camber angle effect on tread load distribution.

Q231. A vehicle’s alignment printout shows excessive positive camber. A common wear pattern is:

Correct Answer: A
Explanation: Positive camber tilts the top outward, loading the outer tread more, causing outer-edge wear.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: camber angle effect on tread load distribution.

Q232. A technician uses a vacuum pump to bleed brakes. The main advantage is:

Correct Answer: B
Explanation: Vacuum bleeding can pull fluid and air through the system without repeated pedal strokes.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: air removal techniques in hydraulic systems.

Q233. A vehicle’s spark plugs show white, blistered insulators. This most often indicates:

Correct Answer: A
Explanation: Blistering and very white plugs can indicate overheating from lean conditions, over-advanced timing, or too-hot plugs.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: spark plug reading for heat/lean indications.

Q234. A multimeter set to measure resistance should NOT be used across a powered circuit because:

Correct Answer: B
Explanation: Ohms measurement applies an internal meter voltage; measuring resistance on a live circuit can damage the meter and is inaccurate.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: safe meter use: resistance measurement requires de-energized circuit.

Q235. A vehicle’s clutch pedal engages very close to the floor and shifts are difficult. A common hydraulic cause is:

Correct Answer: A
Explanation: Air compresses, reducing slave cylinder travel and causing poor clutch release.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic actuation travel loss due to air compressibility.

Q236. A vehicle’s manual transmission grinds going into reverse, but other gears are fine. A likely reason is:

Correct Answer: A
Explanation: Reverse is commonly unsynchronized, so gears can clash if shafts are still spinning.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: synchronization and gear clash (reverse gear behavior).

Q237. An engine idles smoothly but hesitates at steady cruise. A likely cause is:

Correct Answer: A
Explanation: Cruise hesitation can result from marginal fuel delivery or a sensor causing mixture oscillations under light load.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: air-fuel control stability at steady-state conditions.

Q238. A vehicle’s exhaust is loud near the engine bay and an O2 sensor code appears. The leak can cause a code because:

Correct Answer: B
Explanation: Upstream leaks can pull in outside oxygen, making the sensor read lean and affecting fuel trims.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: exhaust leak influence on oxygen sensor readings.

Q239. A vehicle’s engine oil level is above the full mark. A risk of overfilling is:

Correct Answer: B
Explanation: Overfilled oil can be whipped into foam, reducing effective lubrication and oil pressure stability.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: oil aeration and lubrication film integrity.

Q240. A battery terminal is tightened but the vehicle still has intermittent power loss. A likely cause is:

Correct Answer: A
Explanation: Even tight clamps can be electrically poor if contact surfaces are oxidized/painted; clean metal-to-metal contact is required.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: contact surface condition and electrical conductivity.

Q241. A technician is selecting a jack stand location. The most important factor is:

Correct Answer: B
Explanation: Jack stands must support the vehicle on strong structural points to prevent collapse.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: proper support point selection for lifting safety.

Q242. A vehicle’s brake pedal is high and hard, and stopping is poor. The most likely cause is:

Correct Answer: B
Explanation: Loss of booster assist makes the pedal hard and increases required effort, reducing effective braking by the driver.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: vacuum assist contribution to braking effort.

Q243. A vehicle’s steering wheel is off-center after an alignment, but the car drives straight. This typically indicates:

Correct Answer: B
Explanation: If toe is correct but the wheel is not centered, adjustments were not balanced or wheel position wasn’t set during toe adjustment.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: steering wheel centering during toe adjustment.

Q244. A mechanic is choosing between penetrating oil and threadlocker. Penetrating oil is mainly used to:

Correct Answer: B
Explanation: Penetrants creep into threads and help free rusted fasteners; threadlocker is for preventing loosening.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: chemical aid selection: penetration vs locking.

Q245. A vehicle’s coolant reservoir repeatedly overflows, but coolant level is normal when cold. A possible cause is:

Correct Answer: B
Explanation: Combustion gas intrusion raises system pressure and can push coolant into/through the reservoir.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: abnormal system pressurization from combustion gas intrusion.

Q246. A connection has 0.20 Ω of resistance. If 10 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 10×0.20 ≈ 2.00 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q247. A gear with 30 teeth drives a gear with 10 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 30/10 ≈ 3.00:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q248. After repeated hard stops from 45 mph, a driver notices brake fade. The most direct physical reason for fade is:

Correct Answer: B
Explanation: Repeated braking converts kinetic energy into heat. Excess heat can reduce pad friction and can boil fluid, creating compressible vapor and a softer pedal.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: energy conversion to heat and thermal limits (brake fade mechanisms).

Q249. A hydraulic ram sees 900 lb of force applied over an area of 2.5 in². The pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 900/2.5 ≈ 360 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q250. A gear with 40 teeth drives a gear with 18 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 40/18 ≈ 2.22:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q251. A device draws 0.35 A from a 12 V battery for 12 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.35 × 12 ≈ 4.2 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q252. A gear with 24 teeth drives a gear with 12 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 24/12 ≈ 2.00:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q253. A mechanic applies 55 lb of force at the end of a 1.8 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 55×1.8 ≈ 99 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q254. A gear with 24 teeth drives a gear with 15 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 24/15 ≈ 1.60:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q255. A gear with 36 teeth drives a gear with 16 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 36/16 ≈ 2.25:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q256. A hydraulic ram sees 3600 lb of force applied over an area of 2.5 in². The pressure is closest to:

Q257. A connection has 0.10 Ω of resistance. If 15 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 15×0.10 ≈ 1.50 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q258. After repeated hard stops from 55 mph, a driver notices brake fade. The most direct physical reason for fade is:

Q259. A device draws 1.5 A from a 12 V battery for 40 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 1.5 × 40 ≈ 60.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q260. A mechanic applies 25 lb of force at the end of a 1.5 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 25×1.5 ≈ 38 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q261. A device draws 2 A from a 12 V battery for 24 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 2 × 24 ≈ 48.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q262. A mechanic applies 55 lb of force at the end of a 1.5 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 55×1.5 ≈ 82 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q263. A device draws 0.75 A from a 12 V battery for 40 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.75 × 40 ≈ 30.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q264. A gear with 20 teeth drives a gear with 16 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 20/16 ≈ 1.25:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q265. A hydraulic ram sees 2400 lb of force applied over an area of 3.0 in². The pressure is closest to:

Q266. After repeated hard stops from 70 mph, a driver notices brake fade. The most direct physical reason for fade is:

Q267. A device draws 0.5 A from a 12 V battery for 6 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.5 × 6 ≈ 3.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q268. A mechanic applies 35 lb of force at the end of a 1.5 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 35×1.5 ≈ 52 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q269. A hydraulic ram sees 1200 lb of force applied over an area of 1.5 in². The pressure is closest to:

Q270. A hydraulic ram sees 3600 lb of force applied over an area of 1.5 in². The pressure is closest to:

Q271. A device draws 0.2 A from a 12 V battery for 24 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.2 × 24 ≈ 4.8 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q272. A mechanic applies 35 lb of force at the end of a 1.8 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 35×1.8 ≈ 63 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q273. A gear with 40 teeth drives a gear with 16 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 40/16 ≈ 2.50:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q274. A device draws 0.75 A from a 12 V battery for 6 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.75 × 6 ≈ 4.5 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q275. A connection has 0.20 Ω of resistance. If 5 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 5×0.20 ≈ 1.00 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q276. A device draws 0.35 A from a 12 V battery for 15 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.35 × 15 ≈ 5.2 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q277. A gear with 24 teeth drives a gear with 16 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 24/16 ≈ 1.50:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q278. A mechanic applies 25 lb of force at the end of a 2.0 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 25×2.0 ≈ 50 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q279. A connection has 0.20 Ω of resistance. If 120 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 120×0.20 ≈ 24.00 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q280. A connection has 0.10 Ω of resistance. If 5 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 5×0.10 ≈ 0.50 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q281. A device draws 1.5 A from a 12 V battery for 15 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 1.5 × 15 ≈ 22.5 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q282. A hydraulic ram sees 2400 lb of force applied over an area of 2.5 in². The pressure is closest to:

Q283. A device draws 2 A from a 12 V battery for 8 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 2 × 8 ≈ 16.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q284. A hydraulic ram sees 1200 lb of force applied over an area of 2.0 in². The pressure is closest to:

Q285. A device draws 0.2 A from a 12 V battery for 10 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.2 × 10 ≈ 2.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q286. A device draws 1.2 A from a 12 V battery for 15 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 1.2 × 15 ≈ 18.0 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q287. A gear with 36 teeth drives a gear with 10 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 36/10 ≈ 3.60:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q288. A hydraulic ram sees 1800 lb of force applied over an area of 3.0 in². The pressure is closest to:

Q289. A device draws 1.2 A from a 12 V battery for 6 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 1.2 × 6 ≈ 7.2 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q290. A gear with 36 teeth drives a gear with 18 teeth. The speed ratio (driver:driven) is closest to:

Correct Answer: C
Explanation: Speed ratio ≈ teeth on driven / teeth on driver? For simple gear pairs, driven speed = driver speed × (driver teeth/driven teeth). The driver:driven speed ratio is 36/18 ≈ 2.00:1.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: gear tooth count relationship to speed ratio.

Q291. A hydraulic ram sees 3000 lb of force applied over an area of 2.5 in². The pressure is closest to:

Q292. A device draws 0.35 A from a 12 V battery for 8 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 0.35 × 8 ≈ 2.8 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q293. A hydraulic ram sees 900 lb of force applied over an area of 1.5 in². The pressure is closest to:

Correct Answer: C
Explanation: Pressure P = F/A = 900/1.5 ≈ 600 psi.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: hydraulic pressure calculation (P = F/A).

Q294. A device draws 1.2 A from a 12 V battery for 8 hours. Approximately how many amp-hours (Ah) are used?

Correct Answer: C
Explanation: Amp-hours used = current × time = 1.2 × 8 ≈ 9.6 Ah.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: battery capacity relationship (Ah = A×time).

Q295. A connection has 0.01 Ω of resistance. If 10 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 10×0.01 ≈ 0.10 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q296. A mechanic applies 55 lb of force at the end of a 2.4 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 55×2.4 ≈ 132 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q297. After repeated hard stops from 65 mph, a driver notices brake fade. The most direct physical reason for fade is:

Q298. A connection has 0.01 Ω of resistance. If 30 A flows through it, the voltage drop across the connection is closest to:

Correct Answer: C
Explanation: Voltage drop V = I×R = 30×0.01 ≈ 0.30 V.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: Ohm’s law voltage drop (V = I×R) in high-current circuits.

Q299. A mechanic applies 70 lb of force at the end of a 1.8 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 70×1.8 ≈ 126 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).

Q300. A mechanic applies 80 lb of force at the end of a 1.8 ft wrench. The torque applied is closest to:

Correct Answer: C
Explanation: Torque T = F×r = 80×1.8 ≈ 144 ft·lb.
Citation: ASVAB content domain — Auto & Shop Information; underlying principle: torque calculation (T = F×lever arm).