A ______ is a smaller part with an identifiable process or function.

• A. Component
• B. Subsystem
• C. System
• D. Module

Answer: (C)

A module is a discrete part within a larger system that has a specific function. In engineering and commissioning, a module is designed to be a self-contained unit with a clearly defined purpose and its own inputs and outputs, which lets it operate independently while still fitting into the bigger system. This makes it easier to design, test, replace, or upgrade without affecting unrelated parts.

This idea differs from a system, which is the whole collection of parts that work together; a subsystem, which is a larger grouping of components forming a portion of the system; and a component, which is any part of a system but may not be a self-contained unit with its own clearly defined function and interfaces. The term that best fits a smaller part with an identifiable process or function is a module.