In: Electrical Engineering
A system description that reveals whether a system is stable or not stable without consideration of other system attributes.
A. Stable system
B. Absolute Stability
C. Marginally stable
D. Optimum control system
Hence, A system which produces a stable output for a stable input is called as Stable System.
A system is said to be Absolutely Stable if it produces a constant output even if there are any variations in input.
A system is said to be marginally stable if it produces sustained oscillations in the output even if the input is constant.
Similarly an Optimum Control system is used to know the system stability by using optimum controller.
Hope it is useful.