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Q: If 4 reactions are acting on a beam, then the system is :
  • A. Unstable & indeterminate
  • B. Stable & indeterminate
  • C. Stable & determinate
  • D. Can't say
Correct Answer: Option D - The given information about the system is insufficient because the stability would depend upon the nature of forces acting on the planer structure. But since there are 4 reactions at least we can say that system is indeterminate.
D. The given information about the system is insufficient because the stability would depend upon the nature of forces acting on the planer structure. But since there are 4 reactions at least we can say that system is indeterminate.

Explanations:

The given information about the system is insufficient because the stability would depend upon the nature of forces acting on the planer structure. But since there are 4 reactions at least we can say that system is indeterminate.