Which acronym corresponds to Factor of Safety?

• A. WLL
• B. Factor of Safety
• C. BS
• D. MBS

Answer: (B)

Factor of Safety is a measure of how much stronger a system is than the load it must carry. It’s the ratio of the available strength to the actual applied load, showing the margin built in for safety. The common shorthand for this idea is the acronym FS. In the options given, the label that names the concept itself directly aligns with what FS stands for, making it the best match to the idea being tested. For example, if a component can withstand 100 kN before failure but is only expected to carry 20 kN in normal use, the Factor of Safety is 100/20 = 5, illustrating a clear safety margin.

The other terms refer to different quantities: Working Load Limit describes the maximum load you should apply in service; and Breaking Strength (often called MBS or BS, depending on context) refers to the load at which the component fails. They relate to capacities and design limits, but they are not the acronym for Factor of Safety itself.