Which of the following descriptions is correct?

Question

BlackTom AI · Accepted Answer

When evaluating the statements, start by considering what surface roughness and dimensional accuracy represent in manufacturing and metrology.
Option A: 'Surface roughness is a microscopic shape error that has little effect on the performance of the part.' This is misleading because surface roughness can significantly influence wear, friction, fatigue life, sealing, and mating with other parts; it is not merely a minor or negligible error.
Option B: 'The higher the dimensional accuracy of the part, usually the smaller the value of surface roughness.' This aligns with common engineering practice: achieving tighter dimensional tolerances often goes hand in hand with finishing processes that reduce roughness, resulting in smoother, more precise surfaces. The correlation reflects the overall quality and finish of the part, where better dimensional control typically accompanies smoother surfaces.
Option C: 'The smaller the surface roughness value the better.' While lower roughness generally indicates a smoother surface and is often desirable, stating that the smallest possible roughness is always better is oversimplified. Extremely low roughness can be unnecessary or costly, and some applications tolerate or even require certain roughness levels for lubrication retention, bonding, or other functional reasons.
Option D: 'The larger the value of surface roughness, the more favorable to the parts wear resistance and corrosion resistance.' This is incorrect in most cases: higher roughness typically increases wear, traps more corrosive media, and accelerates wear and corrosion processes rather than improving them. In general, smoother surfaces tend to resist wear and corrosion better, assuming other factors are equal.
In summary, option B correctly captures the commonly observed relationship between dimensional accuracy and surface roughness, while A, C, and D contain misconceptions about the impact and interpretation of surface roughness in part performance.

Which of the following descriptions is correct?

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Which of the following descriptions is correct?

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