Question

Practically all the elements are:

(a) Linear

(b) Non-linear

(c) Exponential

(d) None of the mentioned

This question was posed to me by my college director while I was bunking the class.

My doubt stems from Linear Approximation of the Non-Linear System topic in portion Control System and Components of Control Systems

Answer 1

Right answer is (b) Non-linear

To explain: It is not practically possible to achieve linear elements as there is some error present so practically all the elements present are non-linear but can be made linear only to some extent.