Automotive Information Flashcards
7 cards from real ASVAB practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Automotive Information flashcards as text
What is the purpose of a vehicle's catalytic converter?
Answer: To convert harmful exhaust pollutants (HC, CO, NOx) into less harmful substances
The catalytic converter uses chemical reactions over precious metal catalysts to convert harmful hydrocarbons, carbon monoxide, and nitrogen oxides into water vapor, carbon dioxide, and nitrogen.
A vehicle's power steering system is making a whining noise when turning. What is the most likely cause?
Answer: Low power steering fluid level
Low power steering fluid causes the power steering pump to work harder and cavitate, producing a characteristic whining or groaning noise especially during turning.
What is the main purpose of an engine's timing belt or timing chain?
Answer: To synchronize the crankshaft and camshaft rotation so valves open at the correct time
The timing belt/chain synchronizes the crankshaft and camshaft(s) to ensure intake and exhaust valves open and close at precisely the correct point in each piston's stroke.
In automotive electrical systems, what does the term 'ground' refer to?
Answer: The return path for electrical current, typically the vehicle's metal chassis
In automotive systems, the ground is the common return path for electrical current, using the vehicle's metal body and chassis to complete circuits back to the battery's negative terminal.
What condition is indicated when white smoke pours from a vehicle's exhaust?
Answer: Coolant (antifreeze) is entering the combustion chamber and being burned
Persistent white smoke from the exhaust typically indicates coolant is leaking into the combustion chamber, often due to a blown head gasket or cracked cylinder head.
What does the 'compression ratio' of an engine describe?
Answer: The ratio of cylinder volume at BDC to volume at TDC
Compression ratio is the ratio of the total cylinder volume when the piston is at bottom dead center (BDC) to the volume when the piston is at top dead center (TDC).
What is the purpose of 'tire rotation' as part of regular vehicle maintenance?
Answer: To equalize tire wear by moving tires to different positions on the vehicle
Tire rotation moves tires between different axle positions to equalize uneven wear patterns caused by differences in load, steering forces, and drive forces at each position.