Automotive Information Flashcards

What is the purpose of a vehicle's PCV (Positive Crankcase Ventilation) valve?

Answer: To vent blow-by gases from the crankcase back into the intake

The PCV valve routes harmful blow-by gases from the crankcase back into the intake manifold to be burned rather than released into the atmosphere.

Which type of brake uses hydraulic pressure to squeeze brake pads against a rotor?

Answer: Disc brake

Disc brakes use a hydraulic caliper to squeeze brake pads against a spinning rotor, creating friction to slow the vehicle.

What does a vehicle's alternator do while the engine is running?

Answer: Generates AC current converted to DC to charge the battery and power electronics

The alternator generates alternating current (AC) which is converted to direct current (DC) to recharge the battery and supply power to the vehicle's electrical systems.

What is 'engine displacement'?

Answer: The total volume swept by all pistons in one complete revolution

Engine displacement is the total volume swept by all pistons during one complete cycle, typically measured in liters or cubic inches.

Which component in an automatic transmission uses fluid coupling to transmit power from the engine?

Answer: Torque converter

The torque converter uses fluid coupling to transmit engine power to the transmission, allowing the vehicle to stop without stalling the engine.

What is the function of the vehicle's EGR (Exhaust Gas Recirculation) system?

Answer: To recirculate a portion of exhaust gases back into the intake to reduce NOx emissions

The EGR system recirculates a portion of exhaust gases back into the combustion chamber to lower peak combustion temperatures and reduce nitrogen oxide (NOx) emissions.

When a car's wheel is out of balance, what is the most common symptom?

Answer: Vibration felt in the steering wheel or seat at highway speeds

An unbalanced wheel creates vibration that is typically felt through the steering wheel or floorboard, especially at highway speeds.