2.1 Explain why a copper hammer should be used, and not a steel hammer, when hammer work is done where flammable vapours are present - NSC Agricultural Technology - Question 2 - 2016 - Paper 1
Question 2
2.1 Explain why a copper hammer should be used, and not a steel hammer, when hammer work is done where flammable vapours are present.
2.2 Give THREE reasons for add... show full transcript
Worked Solution & Example Answer:2.1 Explain why a copper hammer should be used, and not a steel hammer, when hammer work is done where flammable vapours are present - NSC Agricultural Technology - Question 2 - 2016 - Paper 1
Step 1
Explain why a copper hammer should be used, and not a steel hammer, when hammer work is done where flammable vapours are present.
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Answer
A copper hammer is preferred to prevent sparks when striking a hard surface, as sparks can ignite flammable vapours. The softer material of copper prevents the risk associated with harder steel hammers, which can create sparks due to their higher rigidity.
Step 2
Give THREE reasons for adding copper to metals to form an alloy.
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Answer
Increases resistance to corrosion, enhancing the durability of the alloy.
Improves conductivity, making the alloy suitable for electrical applications.
Provides hygienic properties, making it suitable for food-related applications.
Step 3
Name the process that is followed to soften tempered brass products for further working processes.
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The process used to soften tempered brass products is known as 'annealing.'
Step 4
Explain why these metal cans must be coated with a thin tin layer.
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The tin layer is essential to prevent corrosion and protect the metal from environmental factors, enhancing the durability and safety of food preservation.
Step 5
Name THREE important properties of tin.
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Malleable, allowing it to be shaped without breaking.
Non-corrosive, providing protection from rust.
Can resist reaction with various substances, maintaining the integrity of food storage.
Step 6
Name THREE elements that are added to steel when manufacturing stainless steel.
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Chromium, for enhancing corrosion resistance.
Manganese, for improving strength and hardness.
Nickel, which adds toughness and stabilizes the structure.
Step 7
Suggest THREE aspects that should be considered when one needs to improve the cohesion properties of an adhesive.
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Surface preparation: Ensuring clean and appropriate surface compatibility for optimal adhesion.
Application method: Using the right technique to apply adhesive for uniform coverage.
Adhesive selection: Choosing an adhesive with suitable properties for the materials being bonded.
Step 8
Name the substance that is added to resin to harden it when doing fiberglass repairs.
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The substance typically added to resin to harden it is called a 'catalyst' or 'hardener.'
Step 9
Why is Vesconite extremely suitable for marine application?
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Vesconite is highly water-resistant, making it ideal for both fresh and saltwater applications, and does not corrode, ensuring longevity in harsh marine environments.
Step 10
Give THREE reasons why the machining of Vesconite holds no health risk for the person working with it.
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It does not contain harmful asbestos or hazardous fibres.
Machining Vesconite does not generate toxic dust or fumes.
It does not give off any poisonous gases, ensuring a safe working environment.
Step 11
Discuss THREE reasons for choosing Vesconite over white metal when manufacturing bushes.
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Higher design load limit, allowing for heavier loads without failure.
Higher fatigue strength, leading to longer-lasting components.
Vesconite does not distort or swell when exposed to moisture, unlike white metal.
Step 12
Name TWO preventative measures that may be followed to prevent lightning from damaging the energiser of an electric fence.
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Install lightning protectors to divert the energy away from sensitive equipment.
Disconnect the battery during thunderstorms to prevent voltage surges.
Step 13
Describe TWO methods that can be used to protect a permanent electric fence energiser system from theft.
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Install it high on a pole or a building, out of reach from the ground.
Lock it within a secure metal enclosure to deter unauthorized access.
Step 14
State THREE design requirements prescribed for the warning signs that are used on an electric fence.
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Signs must be at least 100 mm x 200 mm in size.
The background must be yellow and the text must be black for high visibility.
Inscription must clearly state 'TAKE CARE - ELECTRIC FENCE!' on both sides.
Step 15
State TWO solutions to overcome the problem of reduced earthing efficiency in electric fences due to very dry soil.
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Increase the number of ground spikes to enhance connectivity.
Run an earth return wire parallel to the fence and connect it to ground spikes at regular intervals.
Step 16
Discuss TWO rules or regulations that an electric fence, which is erected next to a public road, must adhere to.
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Ensure that electrified wires are mounted high enough to prevent accidental contact by pedestrians.
Display warning signs clearly indicating the presence of an electric fence in the vicinity.
