Question

Trusses lie in a single plane. And the calculations used to solve the forces are from vector math.

(a) The first part of the statement is false and other part is true

(b) The first part of the statement is false and other part is false too

(c) The first part of the statement is true and other part is false

(d) The first part of the statement is true and other part is true too

This question was addressed to me during an interview.

My question is from Simple Trusses in portion Structural Analysis of Engineering Mechanics

Answer 1

The correct option is (c) The first part of the statement is true and other part is false

To explain: The loading is acting in a plane. Thus the calculations are done in 2D only. As the equations for 3D are different. Although the use of vectors can make our task easy but still 2D calculations are done for the trusses, as they are acting in a same plane.