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
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 steel.... show full transcript
Worked Solution & Example Answer: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 commonly found in stainless steel include chromium, manganese, and nickel. Each of these elements contributes specific properties such as corrosion resistance, strength, and durability.
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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The alloy element that fits this description is Chromium. It is known for its resistance to oxidation and is a key component in many alloys.
Step 3
2.1.3 Name TWO alloy elements that are used to manufacture brass.
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The two alloy elements used to manufacture brass are Copper and Zinc. These elements provide brass with its characteristic properties such as strength and corrosion resistance.
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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PRODUCT
MATERIAL
Hot-water pipes for a milking parlour
Copper/Galvanised steel/PVC plastic
Plumbing fittings
Brass/Galvanised steel/PVC plastic
Cans for processed food
Tinplate
Fishing rods
Glass fibre/Zinc
Non-metal bushes
Composite materials
Coating for non-stick pans
Teflon
Step 5
2.3.1 Name FOUR prescribed requirements for the warning signs that are placed on electric fences.
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The four prescribed requirements for warning signs on electric fences include:
The signs must be firmly clamped to the fence wires at intervals of approximately 10 to 50 meters.
The size of the warning signs should be at least 100 mm x 200 mm.
The background of the signs must be clearly defined, stating "TAKE CARE - ELECTRIC FENCE".
The inscription on the signs should be clear and visible from both sides, with 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:
Inspecting the fence line for vegetation growth that may obstruct the fence.
Checking for damaged or broken wires which can affect the functionality of the fence.
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 a movable electric fence system include:
Insulators,
Grounding spikes,
Energizer,
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 that make fibreglass preferable include:
Lightness
Water tightness
Non-conductive to electricity
Ease of forming into any shape
Resistance to corrosion.
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 of fibreglass should be stored separately because their mixing can lead to an uncontrolled reaction that can cause hazards.
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 include:
The type of material to be joined.
The conditions under which the adhesive 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/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 (fuel).
Oxygen (from the air).
Heat (to reach the ignition temperature).
Step 13
2.8 A process that you can apply to prevent losing the properties of the brass fitting.
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To prevent losing the properties of the brass fitting when soldering, the process of Annealing or Stress relieving can be applied. This involves heating the brass to a specific temperature and allowing it to cool slowly, thus reducing internal stresses.
