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The famous pedestrian Ha'penny Bridge which spans the river Liffey in Dublin is manufactured from a combination of cast iron and steel - Leaving Cert Engineering - Question 4 - 2022
Question 4
The famous pedestrian Ha'penny Bridge which spans the river Liffey in Dublin is manufactured from a combination of cast iron and steel. (i) Explain one difference b... show full transcript
Worked Solution & Example Answer:The famous pedestrian Ha'penny Bridge which spans the river Liffey in Dublin is manufactured from a combination of cast iron and steel - Leaving Cert Engineering - Question 4 - 2022
Step 1
Explain one difference between cast iron and steel.
Answer
Cast iron and steel are both alloys of iron, but they differ primarily in their carbon content. Cast iron typically contains between 2% and 3.5% carbon, while steel has a carbon content of no more than 2%. This higher carbon content in cast iron makes it more brittle compared to steel, which is generally more ductile and malleable.
Step 2
Outline two reasons why cast iron was deemed suitable for the structure of the bridge.
Answer
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Strength and Toughness: Cast iron is known for its ability to perform well in compression, which makes it a suitable choice for the bridge’s structure. It has a high strength that contributes to the overall stability of the bridge.
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Corrosion Resistance: Cast iron exhibits good resistance to corrosion, helping to extend the longevity of the bridge. This property is important for structures that are exposed to environmental elements.
Step 3
Give two other applications of cast iron.
Answer
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Frying Pans: Cast iron is widely used in cookware, particularly for frying pans due to its excellent heat retention and even cooking properties.
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Garden Furniture: It is also employed in manufacturing garden furniture and decorative items because of its ability to be cast into intricate shapes.