Which control systems basically exhibit their output dependency upon input as well as the previous output stages?

a. Open-loop Control System

b. Closed-loop Control System

c. Both a & b

d. None of the above

ANSWER: Closed-loop Control System

Explanation:

In an open-loop system, the control characteristics are totally independent of the system output & hence are generally stable, while the output relies on the controlling action (input) along with the previous output

in a closed-loop control system. As a result, closed loop systems may sometimes become unstable.