What is an example of a manipulated variable?

A manipulated variable is a parameter that can be controlled or adjusted in a process to affect the behavior of a system. In power engineering and process control, all of the listed options—pressure, temperature, and flow—are examples of manipulated variables.

Pressure can be adjusted by controlling valves or pumps, which directly impacts the efficiency and safety of a system. Temperature is manipulated through heating or cooling methods, affecting chemical reactions and physical processes. Flow can be altered using control valves or pumps to manage the rate of fluid passing through a system.

Since each of these variables can be adjusted purposefully to achieve desired outcomes in a system, they are collectively referred to as manipulated variables. Thus, the correct choice encompasses all the options, reinforcing the understanding of how various parameters can be controlled in power engineering processes.