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Match each failure or analysis mode in List I with the section most susceptible in List II.

List I

A. Torsional-flexural buckling

B. Warping-restraint stresses

C. Efficient torsion carrying

D. No warping at all

List II

1. Closed box section

2. Open channel or angle

3. Circular shaft

4. Open section built into a rigid root

Select the correct match.

  • A.A-2, B-1, C-4, D-3
  • B.A-4, B-2, C-1, D-3
  • C.A-2, B-4, C-1, D-3
  • D.A-1, B-4, C-2, D-3

Answer: C

The table sorts the sections by how they behave in torsion. Open sections dominate the trouble column, closed sections the efficiency column, and the circular shaft sits alone as the case the elementary theory describes exactly.

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