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Q: The working stress of a material is expected to be:
  • A. Equal to ultimate stress
  • B. Equal to yield stress
  • C. Less than yield stress
  • D. More than yield stress
Correct Answer: Option C - The working stress of a material is always less than it's yield stress for safety point of view. Working stress is the ratio of ultimate stress to factor of safety.
C. The working stress of a material is always less than it's yield stress for safety point of view. Working stress is the ratio of ultimate stress to factor of safety.

Explanations:

The working stress of a material is always less than it's yield stress for safety point of view. Working stress is the ratio of ultimate stress to factor of safety.