Common uses of mild steel in construction: which selection best reflects where mild steel is employed? (Consider structural members, small-diameter water pipes, and compression members.)
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AStructural works such as beams, joists, and girders
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BSmall-sized water pipes and general pipework
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CColumns and struts in buildings and frames
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DAll of the above
Answer
Correct Answer: All of the above
Explanation
Introduction / Context:Mild steel (low-carbon steel) is widely used in construction due to its weldability, ductility, and cost-effectiveness. The question tests recognition of typical application domains in building and infrastructure projects.
Given Data / Assumptions:
- Mild steel offers adequate yield strength with good ductility.
- It is compatible with welding, bolting, and standard fabrication methods.
- It is supplied as rolled sections, plates, and pipes.
Concept / Approach:Because of its balanced mechanical properties, mild steel is used across structural framing (beams/girders), services (water pipes), and compression members (columns/struts), often in grades optimized for yield strength and toughness. Therefore, the most accurate single answer is the inclusive 'All of the above'.
Step-by-Step Solution:
1) Structural framing: rolled sections in beams, joists, girders.2) Piping: low-pressure water and general utility pipes commonly use mild steel.3) Compression members: columns and struts fabricated from mild steel sections/plates.4) Since all are valid, select 'All of the above'.Verification / Alternative check:Design manuals and steel codes list low-carbon steel grades for a broad range of building members, with higher-strength alloys reserved where required by design.
Why Other Options Are Wrong:
- Any single application understates the broad utility of mild steel in construction practice.
Common Pitfalls:Assuming high-carbon or alloy steels are always superior; in many cases, ductility and weldability of mild steel govern selection rather than peak strength alone.
Final Answer:All of the above