10.1 State ONE cause of the following tyre wear:
10.1.1 Feathering
10.1.2 One side of the thread worn excessively - NSC Mechanical Technology Automotive - Question 10 - 2019 - Paper 1
Question 10
10.1 State ONE cause of the following tyre wear:
10.1.1 Feathering
10.1.2 One side of the thread worn excessively.
10.2 State TWO requirements of a well-designed st... show full transcript
Worked Solution & Example Answer:10.1 State ONE cause of the following tyre wear:
10.1.1 Feathering
10.1.2 One side of the thread worn excessively - NSC Mechanical Technology Automotive - Question 10 - 2019 - Paper 1
Step 1
State ONE cause of the following tyre wear: Feathering
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Feathering is typically caused by incorrect wheel alignment, which leads to uneven tyre wear along the edges of the tyre tread.
Step 2
State ONE cause of the following tyre wear: One side of the thread worn excessively.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One side of the thread being worn excessively can occur due to camber wear or a worn-out kingpin, resulting in uneven load distribution on the tyres.
Step 3
State TWO requirements of a well-designed steering mechanism.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A well-designed steering mechanism should be:
Light and easy to control: It should allow easy maneuverability without requiring excessive effort from the driver.
Free from vibration and road shocks: The mechanism should absorb shocks from the road to ensure a smooth driving experience.
Step 4
Label A–E
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A - Offset/Steering radius/pivot angle radius.
B - Longitudinal axis.
C - Wheel centre line.
D - King-pin inclination angle.
E - Steering axis centre line/King-pin centre line.
Step 5
Define the king-pin inclination.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The king-pin inclination is the inward tilt of the top of the king pin when viewed from the front. This angle is crucial for steering stability and tyre wear.
Step 6
Use a labelled sketch to show the Ackermann angle layout.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The Ackermann angle layout can be illustrated with a sketch showing the following:
A - Rear axle.
B - Longitudinal axis.
C - Front wheels.
D - Steering arms.
E - Extended centre lines from steering arms.
F - Intersection/Centre point.
Step 7
What is the purpose of toe-out on turns?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The purpose of toe-out on turns is to allow the front wheels to rotate at different angles during a turn, which ensures that the outer wheel covers a greater distance than the inner wheel, thereby providing better grip and reducing tyre scrubbing.
Step 8
State TWO checks on a wheel BEFORE it is balanced.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Before balancing a wheel, the following checks should be conducted:
Examine the tyres for bruises, cracks, and damaged sidewalls: This ensures the integrity and safety of the wheel.
Inspect for foreign matter on the rim and tyres: Clean any debris that might affect balancing.
Step 9
What is the purpose of the catalytic converter fitted to the exhaust system of a motor vehicle?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The catalytic converter's main purpose is to convert harmful pollutants in the exhaust gases of the engine into non-toxic substances, making the vehicle more environmentally friendly.
Step 10
State THREE main aims of the adaptive speed control system.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The main aims of the adaptive speed control system are:
Maintain a set speed as determined by the driver.
Adapt speed and maintain a safe distance from the vehicle in front.
Provide a warning if there is a risk of a collision.
Step 11
What is the function of the slip-ring and brush assembly on an alternator?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The function of the slip-ring and brush assembly is to provide a moveable connection to allow current flow from the alternator's rotor to the stator.
Step 12
Draw the symbol of a diode that shows the direction of current flow.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The symbol for a diode is presented as an arrow pointing in the direction of current flow, indicating the diode's function of allowing current to pass in only one direction.
Step 13
State TWO advantages of an electrical fuel pump on the fuel system of an internal combustion engine.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Two advantages of an electrical fuel pump are:
Immediate supply of fuel when the ignition switch is turned on: This enhances engine starting efficiency.
Compact and lighter design: This aids in better overall engine design and integration.
