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Q: .
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  • A. 4t tension
  • B. 4t compression
  • C. 5t tension
  • D. None of these
Correct Answer: Option D - If three members form a truss joint for which two of the members are collinear and there is no external load or reaction at that joint, then the third non-collinear member is a zero force member. • For the given truss consider joint B, member BC & BF are connected to joint B and the reaction at point B is acting vertically upwards in the direction of member BF. Hence, another member BC has to be a zero force member.
D. If three members form a truss joint for which two of the members are collinear and there is no external load or reaction at that joint, then the third non-collinear member is a zero force member. • For the given truss consider joint B, member BC & BF are connected to joint B and the reaction at point B is acting vertically upwards in the direction of member BF. Hence, another member BC has to be a zero force member.

Explanations:

If three members form a truss joint for which two of the members are collinear and there is no external load or reaction at that joint, then the third non-collinear member is a zero force member. • For the given truss consider joint B, member BC & BF are connected to joint B and the reaction at point B is acting vertically upwards in the direction of member BF. Hence, another member BC has to be a zero force member.