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.
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Answer
Kerb mass against the manufacturer's specifications.
Uneven wear on the tyres.
Tyre pressure.
Run-out on the wheels.
Correct preload on the wheel bearings.
Step 2
Explain the purpose of toe-out on turns.
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Answer
Toe-out on turns helps to ensure that the front wheels turn at different angles when the vehicle is in a corner, allowing for better handling and reducing tire scuffing.
Step 3
Define dynamic balance of a tyre and wheel assembly.
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Answer
Dynamic balance refers to the equal distribution of all weights around the axis of rotation in all rotation parts, ensuring smooth operation while minimizing vibrations.
Step 4
Give TWO reasons why a motor vehicle is equipped with a speed control system.
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Answer
The speed control system electronically manages the throttle opening to maintain a constant speed.
It enhances driver comfort by minimizing the need for constant speed adjustments.
Step 5
State TWO disadvantages of the speed control system.
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Answer
The system can be expensive to install and maintain.
High maintenance costs if the system becomes faulty.
Step 6
What is the purpose of a diode in an alternator?
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Answer
The diode allows current to flow in only one direction and blocks any reverse current, ensuring the correct functioning of the alternator by providing a stable output.
Step 7
State TWO advantages of an electric fuel pump.
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Answer
It provides an immediate supply of fuel when the ignition is turned on.
It has a compact design with lower operational noise.
Step 8
State TWO criteria that a fuel injector needs to comply with.
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Precise fuel flow rate.
Good linearity across various engine speeds.
Step 9
Identify the wheel alignment angle shown in FIGURE 10.9.
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Answer
Ackerman angle steering principle.
Step 10
Label A–F in FIGURE 10.9.
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Answer
A – Rear axis
B – Longitudinal axis
C – Steering arms
D – Front wheels
E – Extended centre lines from steering arms
F – Intersection
Step 11
Define the alignment angle as shown in FIGURE 10.9.
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Answer
It is the angle at which the centre lines of the steering arms, if extended, would intersect with the longitudinal axis of the vehicle.
Step 12
Identify the component shown in FIGURE 10.10.
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Answer
Rotor assembly.
Step 13
Label A–C in FIGURE 10.10.
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A – Slip ring
B – Brushes
C – Pole pieces
Step 14
State the function of the component in FIGURE 10.10.
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Answer
The function of the rotor assembly is to generate a rotating electro-magnet that produces the necessary current.
