Question

In a stable control system backlash can cause which of the following?

(a) Underdamping

(b) Overdamping

(c) Poor stability at reduced values of open loop gain

(d) Low-level oscillations

I got this question in final exam.

I'd like to ask this question from Linear Approximation of the Non-Linear System in section Control System and Components of Control Systems

Answer 1

Correct choice is (d) Low-level oscillations

The explanation is: In stable control systems backlash is the form of the error which may cause low level of the oscillations and hence can be useful sometimes as it increases the damping.