10.1 Define static balance of a wheel and tyre assembly - NSC Mechanical Technology Automotive - Question 10 - 2020 - Paper 1
Question 10
10.1 Define static balance of a wheel and tyre assembly.
10.2 State THREE factors to be checked before the wheel balancing process can be performed.
10.3 FIGURE 10... show full transcript
Worked Solution & Example Answer:10.1 Define static balance of a wheel and tyre assembly - NSC Mechanical Technology Automotive - Question 10 - 2020 - Paper 1
Step 1
Define static balance of a wheel and tyre assembly.
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Answer
The static balance of a wheel and tyre assembly refers to the equal distribution of all weights around the axis of rotation in the rotational plane, ensuring that the wheel does not wobble or bounce when spinning.
Step 2
State THREE factors to be checked before the wheel balancing process can be performed.
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Answer
Uneven wear on the tyre - This can affect the balance and cause vibrations.
Tyre pressure - Proper inflation is necessary for accurate balancing.
The wheel rim - Checking for damages and ensuring the bead is seated correctly on the rim is critical.
Step 3
Identify the wheel alignment angle in FIGURE 10.3.
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Answer
The wheel alignment angle identified in FIGURE 10.3 is the positive caster angle.
Step 4
Label parts A–G in FIGURE 10.3.
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Answer
A. Point of wheel contact
B. Kingpin
C. Centre line of kingpin
D. Positive caster angle
E. Perturbation line
F. Front of vehicle / Direction / Wheel / Tyre
G. Control point of kingpin centre line.
Step 5
Define the positive castor angle.
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Answer
The positive caster angle is defined as the backward tilt of the kingpin at the top when viewed from the side, which enhances the vehicle's stability and handling.
Step 6
Explain the function of the Ackermann principle.
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Answer
The Ackermann principle provides variable toe-out for the front wheels on turns, allowing the outer wheel to turn at a larger angle than the inner wheel. This improves stability during cornering and ensures a true rolling motion without scuffing.
Step 7
Describe the purpose of the catalytic converter on the exhaust system of a motor vehicle.
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Answer
The catalytic converter's purpose is to convert the pollutants and exhaust gases from the engine into non-toxic substances, contributing to a reduction in environmental impact.
Step 8
State TWO requirements that must be met for a catalytic converter to function effectively.
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The converter must be operated at temperatures of at least 250°C to be effective.
The temperature should be between 400°C and 600°C to prevent damage and ensure optimal performance.
Step 9
Explain how the lambda oxygen sensor operates.
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The lambda oxygen sensor is installed in the exhaust gas flow and reacts to the temperature changes caused by the exhaust gases. It compares the oxygen content in the exhaust with the air-fuel mixture in the intake, thereby providing data to the electronic control unit for proper combustion adjustments.
Step 10
State FOUR precautionary measures to be taken when working on an alternator charging system.
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Always connect the battery with the negative pole to the negative cable.
Always connect the booster battery in parallel, not series.
Disconnect the alternator before making any changes to ensure safety.
Never run the alternator on an open circuit.
Step 11
Name TWO types of electric fuel pumps.
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