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10.1 State FIVE factors to be taken into account before attempting a wheel alignment adjustment or check - NSC Mechanical Technology Automotive - Question 10 - 2019 - Paper 1
Question 10
10.1 State FIVE factors to be taken into account before attempting a wheel alignment adjustment or check. 10.2 Explain the purpose of toe-out on turns. 10.3 Define... show full transcript
Worked Solution & Example Answer:10.1 State FIVE factors to be taken into account before attempting a wheel alignment adjustment or check - NSC Mechanical Technology Automotive - Question 10 - 2019 - Paper 1
Step 1
State FIVE factors to be taken into account before attempting a wheel alignment adjustment or check.
Answer
Before performing a wheel alignment check, it is essential to consider the following factors:
- Kerb mass against manufacturer specifications: Ensure the vehicle's weight is within acceptable limits.
- Tyre pressure: Verify that all tyres are inflated to the correct pressures as specified by the manufacturer.
- Uneven wear on the tyres: Inspect for signs of abnormal wear, which can indicate alignment issues.
- Run-out on the wheels: Check for any deviation in the wheel's rotation which can affect alignment.
- Shock absorbers effectiveness: Assess the condition of shock absorbers as they play a crucial role in maintaining alignment.
Step 2
Explain the purpose of toe-out on turns.
Answer
Toe-out on turns is designed to allow the front wheels to point outward during a turn, promoting smoother cornering and enhanced stability. This setup enables the inner wheel to turn at a sharper angle compared to the outer wheel, which balances the difference in the travel distance for each wheel and improves tire grip.
Step 3
Define dynamic balance of a tyre and wheel assembly.
Answer
Dynamic balance refers to the equal distribution of weight around the entire wheel and tyre assembly. This ensures that during rotation, the assembly does not experience vibrations or wobbling, contributing to smoother handling and reducing wear on suspension components.
Step 4
Give TWO reasons why a motor vehicle is equipped with a speed control system.
Answer
- Electronic throttle control: The system maintains a consistent speed, allowing the driver to focus on the driving environment without needing to constantly adjust the accelerator.
- Fuel economy improvement: By controlling the engine’s throttle electronically, it helps optimize fuel consumption during driving.
Step 5
State TWO disadvantages of the speed control system.
Answer
- Expense of the system: The installation and maintenance costs can be high, especially if the system malfunctions.
- Complexity and reliability: Increased complexity compared to traditional throttle control can lead to more potential points of failure.
Step 6
What is the purpose of a diode in an alternator?
Answer
The diode in an alternator serves to permit electric current to flow in one direction only, ensuring that the generated electrical energy is directed correctly toward the battery and preventing reverse current that could damage the system.
Step 7
State TWO advantages of an electric fuel pump.
Answer
- Immediate fuel delivery: Electric fuel pumps provide an instant supply of fuel when the ignition is turned on, enhancing engine startup efficiency.
- Compact design: These pumps are generally smaller and lighter than traditional mechanical pumps, allowing for flexible installation options.
Step 8
State TWO criteria that a fuel injector needs to comply with.
Answer
- Precise flow rate: The injector must deliver a specific amount of fuel within an exact time frame to ensure optimal engine performance.
- Good linearity: It should maintain a consistent spray pattern across varying pressures to ensure efficient combustion.
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Step 11
Define the alignment angle as shown in FIGURE 10.9.
Answer
The alignment angle is defined as the angle formed between the extended center lines of the steering arms, which intersect at the longitudinal axis of the vehicle. This angle is critical for ensuring effective steering performance and stability.
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