Match the following lists :
| List-I (Sections) | List-II (Limiting width to thickness ratio) |
|---|---|
| P.Rolled section | 1.88ε² |
| Q.Welded section | 2.42ε |
| R.Circular hollow section | 3.15·7ε |
| S.Hot rolled RHS | 4.13·6ε |
Select the correct answer using the code given below :
- A2 3 4 1
- B3 1 4 2
- C3 4 1 2Correct
- D2 4 3 1
Solution
Concept
IS 800 semi-compact limits
Step-by-step solution
1. Rolled section (outstand of flange): 15.7ε → 3. 2. Welded section (outstand of flange): 13.6ε → 4. 3. Circular hollow section (D/t): 88ε² → 1. 4. Hot rolled rectangular hollow section: 42ε → 2.
Explanation
The limits for semi-compact sections depend on the type of element and the method of manufacture; welded sections have a smaller limit than rolled ones because of residual stresses.
Why the other options are wrong
The other codes give the circular tube a linear (ε) limit, which is wrong because its limit is in terms of ε².
Shortcut
Rolled 15.7ε; welded 13.6ε; tube 88ε².
Correct answer: C) 3 4 1 2