A_______ is a process condition that must be met before a certain action may be taken.

A_______ is a process condition that must be met before a certain action may be taken.

• A. Mandatory
• B. Permissive
• C. Prerequisite
• D. Conditional

Answer: (B)

In process control, a condition that must be true before the next action is allowed is called a permissive. This term describes gating conditions that must be satisfied to permit a operation to proceed; if any permissive is not met, the action is prevented for safety and reliability. So the statement fits a permissive: a process condition that must be met before a certain action may be taken, enabling the system to proceed only when all such permissives are satisfied. In boiler operations, for example, permissives might include safe furnace pressure, adequate feedwater, and proper interlocks before starting fuel flow. While a prerequisite also means a condition that must be met beforehand, the control-system terminology most often used for these gating checks is permissive. A mandatory phrase describes the necessity of performing the action itself rather than the gating condition, and conditional is a broader idea of dependence that doesn’t name the specific control concept.

In process control, a condition that must be true before the next action is allowed is called a permissive. This term describes gating conditions that must be satisfied to permit a operation to proceed; if any permissive is not met, the action is prevented for safety and reliability.

So the statement fits a permissive: a process condition that must be met before a certain action may be taken, enabling the system to proceed only when all such permissives are satisfied. In boiler operations, for example, permissives might include safe furnace pressure, adequate feedwater, and proper interlocks before starting fuel flow.

While a prerequisite also means a condition that must be met beforehand, the control-system terminology most often used for these gating checks is permissive. A mandatory phrase describes the necessity of performing the action itself rather than the gating condition, and conditional is a broader idea of dependence that doesn’t name the specific control concept.