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_____ section is suitable for small openings and _____ section is suitable for large openings

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_____ section is suitable for small openings  and _____ section is suitable for large openings

(a) flat, I-section

(b) I-section, flat

(c) angles, flat

(d) angles, angles

I got this question during an interview.

I'm obligated to ask this question of Castellated Beams & Lintels in section Design of Beams of Design of Steel Structures

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Correct answer is (a) flat, I-section

Easy explanation: Flats and plate sections are used for small openings. For openings of moderate dimension, back-to-back angles and inverted T-sections are best options. For large openings, channels, I-sections or built-up sections are preferred. If there is any doubt about lateral support from the wall, I-section with plates can be used.

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