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Q: If the total number of reaction components is less than the total number of condition of equilibrium equation available, the structure shall be:
  • A. Stable
  • B. Indeterminate
  • C. Externally redundant
  • D. Unstable
Correct Answer: Option D - If the total number of reaction component is less than the total number of equilibrium equations available, the structure shall be unstable. Ds = R – E Where, R = reaction E = equilibrium equation (generally 3). Ds = 2–3 = –1 (unstable)
D. If the total number of reaction component is less than the total number of equilibrium equations available, the structure shall be unstable. Ds = R – E Where, R = reaction E = equilibrium equation (generally 3). Ds = 2–3 = –1 (unstable)

Explanations:

If the total number of reaction component is less than the total number of equilibrium equations available, the structure shall be unstable. Ds = R – E Where, R = reaction E = equilibrium equation (generally 3). Ds = 2–3 = –1 (unstable)