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
Static balance refers to the equal distribution of all weights around the axis of rotation in the rotational plane, ensuring that the wheel does not cause vibrations while it spins.
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, which may cause imbalance.
Tyre pressure, ensuring it is within the manufacturer's specifications.
The wheel rim for any damages or cracks that could affect balance.
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. Front of vehicle / Direction / Wheel / Tyre
F. Control point of kingpin centre line
G. Position of the tie bar at the end of the king pin at the top, when viewed from the side.
Step 5
Define the positive caster angle.
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The positive caster angle is characterized by the backward tilt of the king pin at the top when viewed from the side.
Step 6
Explain the function of the Ackermann principle.
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Answer
The Ackermann principle allows the front wheels of a vehicle to turn on different radii, enabling the inside wheel to have a smaller radius than the outside wheel during a turn. This ensures that both wheels maintain proper contact with the road, just like a true rolling motion for the front wheels in a corner 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 transform the pollutants and exhaust gases produced by the engine into non-toxic substances, contributing to environmental protection by minimizing harmful emissions.
Step 8
State TWO requirements that must be met for a catalytic converter to function effectively.
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The converter must be at the optimal operating temperature of between 400°C and 600°C.
The system must be accurately controlled to maintain the ideal conditions for conversion.
Step 9
Explain how the lambda oxygen sensor operates.
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The lambda oxygen sensor is installed within the exhaust system and measures the oxygen content in the exhaust gases. It reaches the operating temperature, compares oxygen levels with the intake air, and sends signals to the electronic control unit to adjust the air-fuel mixture for efficient combustion.
Step 10
State FOUR precautionary measures to be taken when working on an alternator charging system.
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Answer
Always connect the battery with the negative pole to the negative cable.
Ensure the booster battery is connected in parallel.
Disconnect the alternator before connecting or charging a battery.
Adjust the fan belt to the correct tension before attempting a voltage test on an alternator.
Step 11
Name TWO types of electric fuel pumps.
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