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Read the following stimulus and answer parts (a) and (b).
A steel bar is loaded in tension in a test rig. At a stress of 210 MPa the bar is measured to have a strain of 0.0010.
the Young's modulus of the steel.
A second bar, made of aluminium, has a lower Young's modulus than the steel bar. What does this tell you about the aluminium?
A structural member is made from a steel with an ultimate tensile strength of 480 MPa. In service it is designed to carry a working, or allowable, stress of 120 MPa. What factor of safety has been applied?
Read the following stimulus and answer parts (a) and (b).
The figure shows a simply supported steel truss bridge. The members of the truss carry only tension or compression. The bridge rests on a fixed (pinned) support at one end and a roller support at the other.
As traffic loads the bridge downward near mid-span, the bottom chord of the truss is stretched. What stress does the bottom chord carry?
Why is one end of the bridge placed on a roller support rather than fixing both ends?
The engineers are using the following visuals in their analysis:
What is the purpose of diagrammatically representing forces within structures?
Practice IB Design Technology (First Exam 2027) Topic B3.2 Structural Systems Application and Selection with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for B3.2 Structural Systems Application and Selection and mirrors Paper 1, 2 style where relevant.
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