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. This ensures that the wheel does not wobble when in motion.
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.
Tyre pressure.
The wheel rim for damage, including cracks and foreign matter.
Step 3
Identify the wheel alignment angle in FIGURE 10.3.
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Answer
The wheel alignment angle indicated 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. Perpendicular line
F. Front of vehicle / Direction / Wheel / Tyre
G. Control axis 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.
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 steer in such a way that they can rotate to different angles during turns. This minimizes tire scrubbing and enhances handling by ensuring that each wheel traces a circular arc consistent with its distance from the turn's center.
Step 7
Describe the purpose of the catalytic converter on the exhaust system of a motor vehicle.
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Answer
A catalytic converter's purpose is to convert pollutants and exhaust gases from the engine into non-toxic substances, thereby contributing to a cleaner environment.
Step 8
State TWO requirements that must be met for a catalytic converter to function effectively.
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Answer
The converter must be maintained at the temperature of at least 250°C.
The temperature should not exceed 600°C to avoid damage and optimize efficiency.
Step 9
Explain how the lambda oxygen sensor operates.
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The lambda oxygen sensor is positioned in the exhaust flow and regulates the temperature to allow accurate measurement of exhaust gases. It compares the oxygen levels in the exhaust with those in the intake, providing feedback to the electronic control unit for precise fuel-air mixture 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 cable first.
Ensure the booster battery is connected in parallel.
Disconnect all electrical loads before connecting or disconnecting a battery.
Adjust the fan belt to the correct tension to avoid excessive wear.
Step 11
Name TWO types of electric fuel pumps.
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