A ______ is the condition that is being controlled.

A ______ is the condition that is being controlled.

• A. Process variable
• B. Manipulated variable
• C. Set point
• D. Control signal

Answer: (A)

The process variable is the condition being controlled—the actual value of the process that the system measures and tries to keep at the desired level. In boiler practice, this is the live value like steam pressure, water level, or temperature. The controller watches the setpoint, which is the target value you want to maintain, and then adjusts the manipulated variable (such as fuel flow or air supply) using a control signal to bring the process variable toward that setpoint. So the process variable is the circulating condition the control loop actively manages.

The process variable is the condition being controlled—the actual value of the process that the system measures and tries to keep at the desired level. In boiler practice, this is the live value like steam pressure, water level, or temperature. The controller watches the setpoint, which is the target value you want to maintain, and then adjusts the manipulated variable (such as fuel flow or air supply) using a control signal to bring the process variable toward that setpoint. So the process variable is the circulating condition the control loop actively manages.