Which of the following correctly pairs components with their definitions regarding pipe and tube sizes?

The correct pairing of components with their definitions regarding pipe and tube sizes emphasizes the importance of understanding the classifications and dimensions used in fluid power systems. The answer involves aligning each component with its precise definition, which is crucial for ensuring compatibility and optimal performance in hydraulic and pneumatic systems.

In this case, the pairing under the correct option accurately reflects the standard nomenclature and industry practices. Each number corresponds to a specific characteristic of either pipe or tube sizes, such as nominal diameter, wall thickness, or specific sizing conventions, and the mappings adhere to established engineering standards.

For instance, understanding the nominal pipe size is vital as it often influences the inner diameter and flow characteristics. Recognizing how these sizes are categorized and defined helps in selecting appropriate components for various applications, ensuring efficiency and reliability in fluid systems.

Understanding these relationships is foundational for anyone involved in fluid power systems, as misinterpretations could lead to significant operational issues or increases in maintenance costs. Thus, the choice reinforces established technical knowledge that professionals in the field are expected to grasp.