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ENGINEERING, CS 2023 HSC 2 MC

Why did steel replace cast iron in bridges built after 1850 ?

  1. It is lighter in weight.
  2. It is easier to produce.
  3. It has greater tensile strength.
  4. It has greater compressive strength.
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\( C \)

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→ Steel is stronger, more ductile, and has a higher tensile strength compared to cast iron, allowing for the construction of larger and more durable structures.

→ Cast iron generally has greater compressive strength than steel (eliminate D).

\(\Rightarrow C \)

♦ Mean mark 55%.

ENGINEERING, CS 2018 HSC 5 MC

Two types of bridge are shown.
 

What are the two types of bridge design shown?

  1. Suspension bridge and masonry arch
  2. Suspension bridge and masonry beam
  3. Reinforced concrete arch and masonry arch
  4. Reinforced concrete arch and masonry beam
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`C`

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 → Both bridges are arch beams, therefore C is correct.

 → In suspension bridges, the deck is suspended from above by vertical cables.

 → Beam bridges are a simple flat beam from one side to another, neither of which are shown here.

`=>C`

ENGINEERING, CS 2020 HSC 8 MC

The photograph shows a transport viaduct based on a series of Roman arches.
 

By using the Roman arch, engineers today can design structures which

  1. are easy to construct.
  2. are quick to construct.
  3. can span long distances.
  4. place foundations in tension.
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`C`

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By Elimination:

→ The type of bridge (in this case arch) does not necessarily determine the ease or length of construction (eliminate `A` and `B`).

→ Arches place the foundations in compression, not tension (eliminate `D`).

`=>C`