ASE Auto Test Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q21What is the function of the governor valve in an automatic transmission system?
✓ Correct answer: D. Regulate hydraulic pressure based on vehicle speed
The governor valve in an automatic transmission is responsible for regulating hydraulic pressure as a function of vehicle speed. It provides input to control shift timing based on the vehicle's speed, which helps determine when the transmission should shift to a higher or lower gear.
Q22When installing a torque converter, what is the necessary step before attaching it to the flywheel to ensure proper alignment and function?
✓ Correct answer: B. Ensure the converter engages all three components: the front pump, stator support, and turbine shaft.
Before securing the torque converter to the flywheel or flexplate, it is crucial to properly engage it with the front pump, stator support, and turbine shaft. This ensures the converter is positioned correctly within the transmission bell housing and prevents damage during operation. The steps involve carefully seating the converter and rotating it until it fully engages with these components, ensuring a seamless connection.
Q23Technician A says a torque converter clutch lock-up eliminates slippage for improved fuel economy. Technician B says a torque converter clutch lock-up prevents transmission overheating. Who is correct?
✓ Correct answer: C. Both Technician A and B
Both technicians are correct. A torque converter clutch lock-up indeed helps to eliminate slippage, leading to improved fuel economy. Additionally, by minimizing slippage, it reduces excess heat generation within the transmission, thereby helping to prevent overheating.
Q24What is the primary function of automatic transmission fluid (ATF) in a vehicle?
✓ Correct answer: D. To lubricate and cool the transmission components
Automatic transmission fluid (ATF) serves primarily to lubricate the moving parts of the transmission and act as a coolant to keep the transmission operating at ideal temperatures. It also aids in transferring hydraulic pressure in the transmission to perform gear changes.
Q25What is the primary function of the EGR valve in an internal combustion engine?
✓ Correct answer: B. Reduce NOx emissions
The EGR (Exhaust Gas Recirculation) valve is designed to re-circulate a portion of the engine's exhaust gases back into the intake manifold. This process reduces the peak combustion temperature, thereby reducing the formation of nitrogen oxides (NOx), which are harmful pollutants.
Q26If a vehicle is exhibiting abnormal tire wear but no pull condition, what alignment issue should be suspected?
✓ Correct answer: D. Incorrect toe
Incorrect toe settings can cause abnormal tire wear without necessarily causing a pull condition. Toe is the alignment angle affecting the angle of the tires in relation to the centerline of the vehicle. When the toe is not set properly, it can lead to irregular tire wear while the vehicle still maintains a straight path.
Q27Which of the following is most likely to cause excessive wear on the inside edge of a tire?
✓ Correct answer: C. Excessive negative camber
Excessive negative camber causes the top of the tire to lean inward, placing more pressure on the inner edge, which leads to excessive wear. Positive camber would cause wear on the outer edge, incorrect caster affects steering but not directly the tire edges, and incorrect toe setting generally causes feathering across the tire tread.
Q28What component of a tire is responsible for providing the cushioning effect and absorbs most of the impacts during driving?
✓ Correct answer: D. Sidewall
The sidewall of a tire provides flexibility and absorbs shocks from the road, offering a cushioning effect during driving. While the tread provides traction and the inner liner keeps air sealed within the tire, the bead helps the tire adhere to the rim. None of these parts absorb impacts like the sidewall does.
Q29The final four digits of a tire's DOT code are '1819'. What does '19' indicate?
✓ Correct answer: B. The manufacture year 2019
The last four digits of a DOT code on a tire indicate the week and year it was manufactured. '19' in the code represents the year 2019, while '18' indicates the 18th week of that year.
Q30What symptom might excessive blow-by gases cause?
✓ Correct answer: C. Increased oil consumption and power loss
Excessive blow-by indicates worn piston rings or cylinder wall issues, leading to oil loss and reduced efficiency.
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