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Q: How many cases out of the following are improperly constrained? 1. Parallel forces 2. concurrent forces 3. perpendicular forces 4. Only moment
  • A. 1
  • B. 2
  • C. 3
  • D. 4
Correct Answer: Option B - When all the forces are parallel then system is said to be unstable. And when forces are concurrent then also the system is unstable. Thus above two cases are improperly constrained.
B. When all the forces are parallel then system is said to be unstable. And when forces are concurrent then also the system is unstable. Thus above two cases are improperly constrained.

Explanations:

When all the forces are parallel then system is said to be unstable. And when forces are concurrent then also the system is unstable. Thus above two cases are improperly constrained.