2.1 The properties of a base metal can be changed for specific uses by adding certain alloy elements - NSC Agricultural Technology - Question 2 - 2016 - Paper 1
Question 2
2.1 The properties of a base metal can be changed for specific uses by adding certain alloy elements.
2.1.1 Name THREE alloy elements that are found in stainless st... show full transcript
Worked Solution & Example Answer:2.1 The properties of a base metal can be changed for specific uses by adding certain alloy elements - NSC Agricultural Technology - Question 2 - 2016 - Paper 1
Step 1
2.1.1 Name THREE alloy elements that are found in stainless steel.
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Answer
Three alloy elements found in stainless steel include:
Chromium
Nickel
Manganese
Step 2
2.1.2 Name the alloy element that has a silvery white colour, is soft, malleable and resistant to oxygen and water, but dissolves in acids and bases.
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Answer
The alloy element that fits this description is Chromium.
Step 3
2.1.3 Name TWO alloy elements that are used to manufacture brass.
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Two alloy elements used to manufacture brass are:
Copper
Zinc
Step 4
2.2 Provide the type of material in the table below that can be used to manufacture the given products.
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2.3.1 Name FOUR prescribed requirements for the warning signs that are placed on electric fences.
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Answer
Four prescribed requirements for warning signs include:
The signs must be firmly clamped to the fence wires at specified intervals.
The sign size should be at least 100 mm x 200 mm.
The background color must be distinct, and the inscriptions should be clear and legible, reading "TAKE CARE - ELECTRIC FENCE".
Signs should be visible from both sides and should have a height of at least 25 mm.
Step 6
2.3.2 Name TWO aspects that must be checked daily when inspecting an electric fence.
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Two aspects that must be checked daily include:
Checking for vegetation that may be growing over the fence.
Inspecting for damaged or broken wires.
Step 7
2.3.3 List FOUR components of the movable electric fence system used to control animals in a specific area.
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Four components of the movable electric fence system include:
Insulators
Energizer
Grounding spikes
Gate handles
Step 8
2.4.1 Name FIVE characteristics of fibreglass which will make troughs made of fibreglass more preferable than metal troughs.
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Five characteristics of fibreglass include:
Lightness
Non-conductive to electricity
Resistance to corrosion
Colour fastness
Toughness
Step 9
2.4.2 Give ONE reason why the catalyst and accelerator of fibreglass should be stored separately.
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The catalyst and accelerator should be stored separately to prevent premature chemical reactions that could lead to unsafe conditions.
Step 10
2.5 State TWO aspects that must be considered when selecting an adhesive.
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Two aspects to consider when selecting an adhesive are:
The type of materials to be joined.
The conditions under which the joint will be used.
Step 11
2.6 Give an example of a hazardous chemical liquid found in the battery of a tractor.
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An example of a hazardous chemical liquid found in the battery of a tractor is Battery acid or Sulphuric acid.
Step 12
2.7 Name the THREE components needed for a fire to burn.
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The three components needed for a fire to burn are:
Material that can burn
Oxygen
Heat
Step 13
2.8.1 Describe a process that you can apply to reduce internal stress in the brass fitting caused by overheating, without losing the properties of the brass fitting.
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The process to reduce internal stress is known as:
Annealing
This involves heating the brass fitting to a specific temperature and then allowing it to cool slowly, thereby relieving stress without compromising its integrity.
