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Doctors Medicines MCQs Q&A

  1. Reaction at smooth pins and hinges which do not move.
  2. Concentrated load on the mid span of a simply supported beam.
  3. Tension in a light inextensible string.
  4. Forces normal to the direction of displacement.
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1 Answers

Option 2 : Concentrated load on the mid span of a simply supported beam.

 Concept: 

The principle of virtual work for deformable bodies says that the external virtual work applied to a structure must equal the internal virtual work that is caused within the structure,  Wv,e = Wv,i

External Virtual Work = Internal Virtual Work

Virtual External Forces×  Real external deflections = Virtual Internal forces × Real Internal Deformations

Reaction at smooth pins and hinges which do not move  Displacement = 0, no work  done by real forces
Concentrated load on the mid-span of a simply supported beam  
Tension in a light inextensible string Inextensible string makes axial deformation = 0
Forces normal to the direction of displacement. Work done in displacement perpendicular to force = 0

 

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