TDC Vehicle Basics 2 — Questions and Answers
Question 1: What is the primary function of a vehicle's alternator?
- To start the engine
- To charge the battery and power electrical systems while the engine runs (Correct answer)
- To control the air conditioning system
- To regulate fuel injection
Correct answer: To charge the battery and power electrical systems while the engine runs
The alternator generates electricity to charge the battery and power electrical systems when the engine is running.
The alternator is driven by a belt connected to the engine's crankshaft, converting mechanical energy into electrical current to charge the battery and power all electrical systems.
Question 2: How often should engine oil typically be changed for most passenger vehicles?
- Every 1,000 km
- Every 5,000-10,000 km or as specified in the owner's manual (Correct answer)
- Only when the oil warning light comes on
- Once a year regardless of mileage
Correct answer: Every 5,000-10,000 km or as specified in the owner's manual
Most manufacturers recommend oil changes every 5,000-10,000 km.
Engine oil lubricates, reduces friction, cools components, and carries away contaminants. Over time it breaks down. Severe driving conditions may require more frequent changes.
Question 3: What does the Check Engine light on the dashboard indicate?
- The engine is overheating
- The engine oil is low
- The vehicle's onboard diagnostic system has detected a fault (Correct answer)
- The vehicle needs an oil change soon
Correct answer: The vehicle's onboard diagnostic system has detected a fault
The Check Engine light indicates that the OBD system has detected a malfunction.
The Check Engine light is triggered by the OBD system when it detects a problem affecting emissions or engine performance. A steady light suggests a non-urgent issue; a flashing light indicates a severe misfire.
Question 4: What is the purpose of the vehicle's coolant system?
- To cool the transmission
- To maintain the engine at its optimal operating temperature (Correct answer)
- To cool the brakes during heavy use
- To provide cool air to the cabin
Correct answer: To maintain the engine at its optimal operating temperature
The coolant system circulates fluid through the engine to absorb excess heat and maintain optimal operating temperature.
The cooling system consists of the radiator, water pump, thermostat, hoses, and coolant fluid. The thermostat maintains engine temperature at 85-105 degrees C. Overheating can cause catastrophic engine failure.
Question 5: What does the term tire tread depth refer to, and why is it important?
- The tire's diameter
- The depth of grooves in the tire surface that provide grip and channel water (Correct answer)
- The thickness of the tire's sidewall
- The air pressure rating of the tire
Correct answer: The depth of grooves in the tire surface that provide grip and channel water
Tire tread depth refers to the grooves that provide traction and channel water away.
New tires have 8-9mm of tread. Grooves channel water away to prevent hydroplaning. The legal minimum is 1.6mm, but safety experts recommend replacing at 3mm. Worn tires dramatically increase stopping distances.
Question 6: Which dashboard indicator warns of engine overheating?
- Oil pressure warning light
- Battery charge indicator
- Engine temperature gauge or warning light (Correct answer)
- Fuel level warning light
Correct answer: Engine temperature gauge or warning light
The engine temperature gauge monitors coolant temperature and alerts when the engine is overheating.
When the temperature gauge moves to the red zone, drivers should pull over, turn off the AC, and let the engine cool. Never open the radiator cap when hot. Common causes include low coolant or a failed water pump.
TDC Vehicle Basics 2
What is the primary function of a vehicle's alternator?