QUESTION 10: SYSTEMS AND CONTROL (AXLES, STEERING GEOMETRY AND ELECTRONICS) (SPECIFIC)
10.1 State FIVE factors that need to be taken into account before any wheel alignment adjustments can be done - NSC Mechanical Technology Automotive - Question 10 - 2018 - Paper 1
Question 10
QUESTION 10: SYSTEMS AND CONTROL (AXLES, STEERING GEOMETRY AND ELECTRONICS) (SPECIFIC)
10.1 State FIVE factors that need to be taken into account before any wheel a... show full transcript
Worked Solution & Example Answer:QUESTION 10: SYSTEMS AND CONTROL (AXLES, STEERING GEOMETRY AND ELECTRONICS) (SPECIFIC)
10.1 State FIVE factors that need to be taken into account before any wheel alignment adjustments can be done - NSC Mechanical Technology Automotive - Question 10 - 2018 - Paper 1
Step 1
State FIVE factors that need to be taken into account before any wheel alignment adjustments can be done.
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Answer
Kerb Mass: Ensure the vehicle's kerb mass (total weight of petrol, spare wheel, etc.) is within the manufacturer's specifications.
Uneven Tyre Wear: Inspect tyres for uneven wear that may affect alignment.
Tyre Pressure: Verify that tyre pressure matches recommended levels for accurate measurements.
Suspension Components: Check suspension ball joints and bushes for excessive wear or damage.
Wheel Bearing Condition: Inspect the wheel bearings for play or binding.
Step 2
Identify the wheel alignment drawing in FIGURE 10.2.
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Answer
The wheel alignment drawing in FIGURE 10.2 depicts the concept of 'Toe' which is crucial for maintaining vehicle stability and handling.
Step 3
Label A–G.
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Answer
A - Contact point of king pin centre line
B - King pin
C - Perpendicular line / vertical line / normal line
D - Negative caster angle
E - Centre line of king pin
F - Front of vehicle / Direction of wheel motion
G - Point of wheel contact / Wheel
Step 4
Define the wheel alignment angle, as indicated in FIGURE 10.2.
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Answer
The wheel alignment angle refers to the angular relationship of the wheels to one another and to the vehicle's frame. It encompasses measurements like camber, caster, and toe, affecting tire wear and handling characteristics.
Step 5
Use a labelled sketch to show toe-out of the front wheels of a vehicle.
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Answer
A sketch illustrating the front view of a vehicle with its front wheels pointing outward, indicating 'toe-out', would show the distance between the front of the wheels being greater than at the rear.
Step 6
State the purpose of kingpin inclination.
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Answer
Kingpin inclination is designed to align the wheels to the straight-ahead position, enhancing stability and reducing the scrub radius for better handling.
Step 7
State TWO chemical processes on which the operating principle of the catalytic converter is based.
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Oxidation: Conversion of carbon monoxide and hydrocarbons into carbon dioxide and water.
Reduction: Conversion of nitrogen oxides into nitrogen and oxygen.
Step 8
Describe the purpose of the speed-control system fitted to a motor vehicle.
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Answer
The speed-control system is designed to maintain the desired vehicle speed by controlling the throttle opening, ensuring a smooth driving experience and improving fuel efficiency.
Step 9
State TWO advantages of the speed-control system fitted to a motor vehicle.
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Answer
Driver Fatigue Reduction: Reduces the physical effort required to maintain a constant speed over long distances.
Consistent Speed Control: Helps to avoid speeding fines by maintaining speed limits.
Step 10
What is the purpose of the pressure regulator in the fuel system of a motor vehicle?
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Answer
The fuel pressure regulator maintains the fuel pressure in relation to the manifold pressure, ensuring optimal fuel delivery to the engine.
Step 11
State TWO methods to increase the output frequency of an alternator to increase the current output.
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Answer
Increase the Rotational Speed: The output frequency can be increased by raising the engine speed, which in turn increases the alternator's rotation.
Add More Turns of Wire: Increasing the number of turns of wire in the alternator's stator can enhance the electromagnetic field.
Step 12
State ONE function of the stator and stator windings in an alternator.
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The stator generates alternating current (AC) by producing a rotating magnetic field that induces voltage in the windings.
Step 13
Function of rotor assembly.
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The rotor assembly functions to rotate within the stator, creating a magnetic field that induces electrical voltage in the windings.
