Free AFCT Auto and Shop Information: Automotive Systems Questions and Answers 1 — Questions and Answers
Question 1: What is the primary function of an engine's radiator?
- To filter the engine oil
- To charge the battery
- To cool the engine coolant (Correct answer)
- To mix air and fuel
Correct answer: To cool the engine coolant
The radiator is a heat exchanger and a key component of the engine's cooling system. Hot coolant from the engine passes through the radiator, where airflow dissipates the heat, before the cooled fluid is circulated back to the engine to absorb more heat.
Question 2: In a four-stroke internal combustion engine, which stroke follows the compression stroke?
- Intake
- Power (Correct answer)
- Exhaust
- Combustion
Correct answer: Power
The four strokes occur in a specific order: Intake, Compression, Power, and Exhaust. After the fuel-air mixture is compressed by the piston (Compression stroke), the spark plug ignites it, forcing the piston down and generating power (Power stroke).
Question 3: What component recharges the battery and powers the electrical system while the engine is running?
- Starter motor
- Alternator (Correct answer)
- Distributor
- Voltage regulator
Correct answer: Alternator
The alternator is driven by a belt connected to the engine's crankshaft. It generates alternating current (AC), which is then converted to direct current (DC) to power the vehicle's electrical accessories and recharge the battery.
Question 4: Which of these is NOT a primary function of engine oil?
- Lubrication
- Cooling
- Cleaning
- Combustion (Correct answer)
Correct answer: Combustion
Engine oil has several key functions: lubrication to reduce friction, cooling by carrying heat away, and cleaning by suspending dirt particles. However, it does not play a direct role in the combustion process of the fuel-air mixture.
Question 5: The master cylinder, calipers, and pads are all components of which system?
- The steering system
- The suspension system
- The braking system (Correct answer)
- The fuel system
Correct answer: The braking system
These are all essential parts of a hydraulic disc brake system. The master cylinder creates hydraulic pressure when the brake pedal is pressed, which is transmitted through brake lines to the calipers. The calipers then squeeze the brake pads against the rotors to slow the vehicle.
Question 6: What is the purpose of the differential in a car's drivetrain?
- To change gears in the transmission
- To allow the wheels to rotate at different speeds (Correct answer)
- To absorb shocks from the road
- To connect the engine to the transmission
Correct answer: To allow the wheels to rotate at different speeds
The differential is a set of gears that transmits engine power to the wheels. Its most important function is to allow the drive wheels to rotate at different speeds, which is necessary when the vehicle is turning a corner, as the outside wheel must travel a greater distance than the inside wheel.
Free AFCT Auto and Shop Information: Automotive Systems Questions and Answers 1
What is the primary function of an engine's radiator?