Question

Which of the following statement is false?

(a) Linear quad element is more accurate than linear tria element

(b) Linear tria element is more accurate than linear quad element

(c) Parabolic elements are better than linear elements

(d) Parabolic quad element has eight codes

This question was addressed to me during an interview.

The query is from Conjugate Gradient Implementation of Quadrilateral Element topic in section Two Dimensional Isoparametric Elements and Numerical Integration of Finite Element Method

Answer 1

Correct answer is (b) Linear tria element is more accurate than linear quad element

Easiest explanation: As quad element has one more term in the displacement function than tria elements it is more accurate. The displacement function is   u=a0+a1x+a2y+a3xy.