9.1 State TWO consequences of a lack of preventative maintenance of mechanical drive systems - NSC Mechanical Technology Fitting and Machining - Question 9 - 2021 - Paper 1
Question 9
9.1 State TWO consequences of a lack of preventative maintenance of mechanical drive systems.
9.2 Give TWO reasons for the malfunctioning of chain drives.
9.3 Stat... show full transcript
Worked Solution & Example Answer:9.1 State TWO consequences of a lack of preventative maintenance of mechanical drive systems - NSC Mechanical Technology Fitting and Machining - Question 9 - 2021 - Paper 1
Step 1
State TWO consequences of a lack of preventative maintenance of mechanical drive systems.
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Increased risk of system failure: Without regular maintenance, mechanical drive systems can suffer from wear and tear, leading to unexpected breakdowns that can cause downtime or even safety hazards.
Higher repair costs: Failure to maintain the system can result in more significant damage that requires expensive repairs, compared to routine maintenance.
Step 2
Give TWO reasons for the malfunctioning of chain drives.
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Improper tension: If the chain is either too loose or too tight, it can lead to excessive wear, skipping of teeth, or even complete failure of the chain drive.
Lack of lubrication: Insufficient lubrication can cause friction between the chain and sprockets, leading to wear and overheating, which can eventually cause the chain to malfunction.
Step 3
State TWO procedures that can be followed to reduce the wear on a gear drive system.
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Regular lubrication: Ensuring that gears are regularly lubricated reduces friction, which minimizes wear and extends the lifespan of the gear drive system.
Proper alignment: Keeping gears properly aligned prevents unnecessary strain and wear, ensuring smoother operation and prolonging the life of the gear system.
Step 4
State TWO properties of EACH of the following materials:
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Step 5
Polyvinyl chloride (PVC)
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Corrosion resistance: PVC is resistant to many chemicals and weathering, making it suitable for outdoor applications.
Flexibility: PVC can be manufactured to be flexible or rigid, adaptable to various applications like plumbing and electrical insulation.
Step 6
Carbon fibre
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High tensile strength: Carbon fibre has a high strength-to-weight ratio, making it ideal for lightweight and strong applications such as aerospace and sports equipment.
Low thermal expansion: Carbon fibre exhibits very low thermal expansion, ensuring stability in various temperature conditions.
Step 7
Bakelite
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High heat resistance: Bakelite can withstand high temperatures without melting or warping, making it ideal for electrical insulators and kitchenware.
Insulative properties: Bakelite acts as a good electrical insulator, which is essential for electrical components.
Step 8
Classify the following materials as thermoplastic composites or thermo-hardened (thermosetting) composites:
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Step 9
Vesconite
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Thermosetting composite: Vesconite is a thermosetting composite known for its strength and durability in high-stress applications.
Step 10
Glass fibre
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Thermosetting composite: Glass fibre is widely used as a thermosetting composite, particularly in reinforced plastic applications.
Step 11
Carbon fibre
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Thermoplastic composite: Carbon fibre can also be used in thermoplastic applications, offering flexibility and strength.
Step 12
Name ONE use of EACH of the following materials:
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Step 13
Teflon
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Used in non-stick coatings for cookware, providing a surface that resists sticking and easy cleaning.
Step 14
Carbon fibre
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Used in the manufacture of high-performance bicycles, providing lightweight and strength advantages.
Step 15
Nylon
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Used in the production of textiles, such as clothing and upholstery, due to its durability and flexibility.
