Two mating parts are to

Two mating parts are to

• A. Aligned by their length
• B. Related by their fit
• C. Mounted side by side
• D. Symmetrical about centerline

Answer: (B)

The key idea is how two parts that are meant to come together relate to each other through their size and tolerance—the fit. When parts are mating, the important relationship is that their dimensions are specified so they either have clearance, a precise press, or another intended interference that allows them to assemble and function properly. That’s why the option describing them as related by their fit is the best choice: it captures how the parts are designed to interact at the interface. If you think about a bolt and a nut, or a shaft and a hole, the successful assembly depends on the fit between the parts, not simply on how long they are, how they are mounted side by side, or whether the parts are symmetric. Those other ideas describe positioning, arrangement, or geometry, but the actual mating relies on the fit between the parts.

The key idea is how two parts that are meant to come together relate to each other through their size and tolerance—the fit. When parts are mating, the important relationship is that their dimensions are specified so they either have clearance, a precise press, or another intended interference that allows them to assemble and function properly. That’s why the option describing them as related by their fit is the best choice: it captures how the parts are designed to interact at the interface.

If you think about a bolt and a nut, or a shaft and a hole, the successful assembly depends on the fit between the parts, not simply on how long they are, how they are mounted side by side, or whether the parts are symmetric. Those other ideas describe positioning, arrangement, or geometry, but the actual mating relies on the fit between the parts.