Question

In open loop system

(a) the control action depends on the size of the system

(b) the control action depends on system variables

(c) the control action depends on the input signal

(d) the control action is independent of the output

I have been asked this question in quiz.

This intriguing question originated from Open-Loop Transfer Function topic in division Automatic Control of Machine Dynamics

Answer 1

Correct answer is (d) the control action is independent of the output

The explanation is: When the input to a system is independent of the output from the system, then the system is called an open-loop or unmonitored system.