Question

Formula for direct cosine l=cosθ= ______

(a) x2-x1

(b) \(\frac{x_2}{l_e}\)

(c) \(\frac{x_1}{l_e}\)

(d) \(\frac{x_2-x_1}{l_e}\)

I had been asked this question in an internship interview.

My doubt is from Plane Trusses topic in chapter Trusses of Finite Element Method

Answer 1

The correct answer is (d) \(\frac{x_2-x_1}{l_e}\)

Best explanation: A truss is a two node element which allows arbitrary orientation in XYZ co-ordinate system. Planar truss is one where all the members and nodes lie within two dimensional plane.