Nonlinear system behavior: with respect to steady states, a nonlinear dynamic process can exhibit how many distinct steady-state values under the same set of inputs and parameters?

Introduction / Context:
Unlike linear systems, nonlinear processes can possess multiple equilibria (steady states) for the same external conditions. This has major implications for start-up, control design, and safety, especially in reactors and separation systems with exothermic/endothermic behavior and strong internal feedbacks.

Given Data / Assumptions:

• Deterministic, time-invariant nonlinear model.
• Inputs and parameters are held fixed.
• Steady state defined by f(x*) = 0 (no time variation).

Concept / Approach:
Nonlinear algebraic equations can have multiple real solutions. Each solution corresponds to a steady state, which may be stable or unstable. Processes like CSTRs with heat release and heat removal often display S-shaped temperature–conversion curves, yielding three steady states (two stable, one unstable) for certain conditions. Therefore, the correct general statement is that a nonlinear system can have more than one steady state.

Step-by-Step Solution:

Verification / Alternative check:
Phase-plane analysis or continuation methods demonstrate multiplicity of equilibria in many nonlinear models.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming uniqueness from linear intuition; multiplicity requires careful operating procedures to avoid unwanted equilibria.

Final Answer:
More than one