TDC - Theoretical Driving Course Exam Theoretical Driving Course Vehicle Parts and Functions 1 — Questions and Answers
Question 1: What is the primary function of the vehicle's alternator?
- To start the engine by providing an initial burst of power
- To generate electrical current and recharge the battery while the engine runs (Correct answer)
- To regulate fuel flow to the engine
- To cool the engine by circulating coolant
Correct answer: To generate electrical current and recharge the battery while the engine runs
The alternator is a generator driven by the engine that converts mechanical energy into electrical energy, keeping the battery charged and powering electrical systems while the vehicle is running.
Question 2: What is the role of the vehicle's radiator?
- To filter exhaust gases before they leave the tailpipe
- To store extra fuel for long trips
- To dissipate heat from the engine coolant and prevent overheating (Correct answer)
- To increase engine compression for better performance
Correct answer: To dissipate heat from the engine coolant and prevent overheating
The radiator is part of the cooling system; hot coolant from the engine flows through its fins where air passing over them removes heat, keeping the engine at a safe operating temperature.
Question 3: What does the vehicle's timing belt or timing chain do?
- It synchronises the rotation of the crankshaft and camshaft so valves open and close at the correct moment (Correct answer)
- It connects the engine to the gearbox to transfer torque
- It controls the tension on the drive wheels to prevent wheel spin
- It links the steering wheel to the front wheels
Correct answer: It synchronises the rotation of the crankshaft and camshaft so valves open and close at the correct moment
The timing belt/chain keeps the crankshaft and camshaft in precise synchronisation, ensuring the engine's intake and exhaust valves open and close at exactly the right point in the combustion cycle.
Question 4: What is the function of the vehicle's catalytic converter?
- To increase fuel efficiency by pre-heating the air-fuel mixture
- To convert harmful exhaust pollutants into less harmful gases before they exit the tailpipe (Correct answer)
- To amplify engine power by compressing exhaust gases
- To filter particles from the engine oil
Correct answer: To convert harmful exhaust pollutants into less harmful gases before they exit the tailpipe
The catalytic converter uses chemical reactions over precious-metal catalysts to convert toxic gases such as carbon monoxide, hydrocarbons, and nitrogen oxides into carbon dioxide, water, and nitrogen.
Question 5: What is the purpose of the vehicle's master cylinder in the braking system?
- To store brake fluid and act as a reservoir only
- To convert the mechanical force from the brake pedal into hydraulic pressure that activates the brakes (Correct answer)
- To automatically adjust brake pad thickness as they wear
- To cool the brake discs during heavy braking
Correct answer: To convert the mechanical force from the brake pedal into hydraulic pressure that activates the brakes
When the driver presses the brake pedal, the master cylinder converts that mechanical force into hydraulic pressure, which is then transmitted through brake lines to the wheel cylinders or callipers to slow the vehicle.
Question 6: What is the function of the vehicle's fuel injector?
- To ignite the air-fuel mixture inside the combustion chamber
- To pump fuel from the tank to the engine at high pressure
- To spray a precise, atomised amount of fuel directly into the engine's intake manifold or combustion chamber (Correct answer)
- To filter contaminants out of the fuel before it reaches the engine
Correct answer: To spray a precise, atomised amount of fuel directly into the engine's intake manifold or combustion chamber
Fuel injectors are electronically controlled nozzles that deliver exactly the right quantity of atomised fuel at the right moment, enabling efficient combustion and reducing emissions compared to older carburettor systems.
TDC - Theoretical Driving Course Exam Theoretical Driving Course Vehicle Parts and Functions 1
What is the primary function of the vehicle's alternator?