ETM 1050 Design Considerations Fundamentals Practice Exam

What is the consequence of inaccurate tolerances on assembly?

Inaccurate tolerances can cause looseness or interference, affecting assembly, motion, and performance. Tolerances only affect cosmetic fit and do not influence movement. Tolerances primarily influence weight, not function. Tolerances have no impact on assembly.

Correct Answer:

Inaccurate tolerances can cause looseness or interference, affecting assembly, motion, and performance.

Explanation:

Tolerances define how much a part’s size can vary and still fit with its mates. If those tolerances are off, parts may be too loose, creating unwanted play, or too tight, causing interference. Either scenario disrupts the assembly process, can prevent proper movement, and lowers overall performance or reliability. Tolerances govern not just how a part looks, but how it functions, how easily it can be assembled, and how smoothly components will move and wear over time. The other statements miss that functional impact, suggesting tolerances affect only appearance or have no effect on assembly, which isn’t accurate.

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