Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the___________________?
Correct answer: B. Ultimate stress to working stress
- A. Ultimate stress to breaking stress
- B. Ultimate stress to working stress
- C. Working stress to ultimate stress
- D. None of these
Explanation
The factor of safety compares the maximum strength the material can withstand with the allowable working stress. Using working stress divided by ultimate stress would give a fraction rather than the usual safety margin.
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