Electronics Engineering (ELEX) Board Practice Exam

What indicates the control sequence state in a control system?

1. State box

2. Output signal

3. Control panel

4. Input register

The correct answer is: State box

In a control system, the control sequence state is best indicated by the state box. The state box is a conceptual or graphical representation that shows the current status or state of the control system at any given time during its operation. It typically encapsulates the various conditions or modes the system can be in and helps determine how the system will respond based on its inputs and previous states. The state box allows engineers to analyze and design control systems effectively by providing a clear visual aid to understand transitions between different states in the control sequence. This is crucial for troubleshooting and ensuring the system behaves as expected under varying conditions. While output signals provide information about the actions of the system and input registers hold data that may influence the control sequence, they do not directly indicate the state of the system itself as clearly as the state box does. The control panel, meanwhile, may provide interactive access and monitoring capabilities, but it does not serve as the primary representation of the control sequence state. Thus, the state box is the most accurate indicator of the control sequence state in a control system.