A process that demands operations to be performed in a specific order is described as a:

• A. Sequential control process
• B. Combination control process
• C. Automatic control process
• D. Manual control process

Answer: (A)

When operations must happen in a specific order, the control approach is sequential. In such a process, you move from one defined step to the next only after the current step finishes and signals it’s safe to proceed. This keeps the flow in the exact order required, preventing steps from starting too early or out of sequence. In a PLC or automation system, you’d use a sequence or step-based logic (a simple state machine) to track which step you’re on and advance only when the previous step is complete, sometimes with interlocks for safety.

For example, in a packaging line, you’d first fill, then cap, then label. You can’t cap before filling, and you can’t label before capping; the system advances through each stage in order only after the prior one is finished.

The other terms don’t fit as well: combining control implies multiple actions that can occur in any order or even in parallel, which breaks the requirement for a fixed sequence. Automatic control just means the process runs without manual input, but it doesn’t specify that the steps must follow a strict order. Manual control relies on human operators to perform steps, not an automatic, order-driven sequence.