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Q: If all the reactions acting on a planar system are concurrent in nature, then the system is:
  • A. Can't say
  • B. Essentially stable
  • C. Essentially unstable
  • D. None of these
Correct Answer: Option C - Externally unstable or essentially unstable: Any system is said to be externally unstable if all the reactions of the system are – (a) concurrent (b) Parallel – If all the reactions are parallel – Rigid body translation. – If the reactions are concurrent – Rigid body rotation.
C. Externally unstable or essentially unstable: Any system is said to be externally unstable if all the reactions of the system are – (a) concurrent (b) Parallel – If all the reactions are parallel – Rigid body translation. – If the reactions are concurrent – Rigid body rotation.

Explanations:

Externally unstable or essentially unstable: Any system is said to be externally unstable if all the reactions of the system are – (a) concurrent (b) Parallel – If all the reactions are parallel – Rigid body translation. – If the reactions are concurrent – Rigid body rotation.