Which of the following description is correct?

Question

BlackTom AI · Accepted Answer

The question asks which description among the options is correct regarding tolerances.
Option A: 'A. Tolerance of parallelism is 0.02 cm'. Here, the unit cm is used, but precision engineering tolerances are typically expressed in millimeters (or micrometers) for mechanical features. 0.02 cm equals 0.2 mm, which is a relatively large tolerance for many precision parts, and without context it is unlikely to be the standard value presented. This makes the statement dubious as a correct description in a typical metrology context.
Option B: 'B. Tolerance of perpendicularity is 0.02 mm'. The term perpendicularity refers to how closely a feature is at right angles to a datum or reference plane. A tolerance of 0.02 mm (20 micrometers) for perpendicularity is a plausible, precise tolerance commonly used in precision machining and inspection. The small, explicit unit of mm aligns with typical practice for angular/perpendicularity controls.
Option C: 'C. Tolerance of perpendicularity is 0.02 cm'. Converting units, 0.02 cm equals 0.2 mm. While not impossible, this is a looser tolerance than 0.02 mm and would generally be considered less precise for a perpendicularity control. In many contexts, if 0.02 mm were specified, it would be written directly as 0.02 mm rather than 0.02 cm. This makes the statement less likely to be correct when a tighter spec is intended.
Option D: 'D. Tolerance of parallelism is 0.02 mm'. This asserts a parallelism tolerance, which is a valid geometric tolerance, but the value 0.02 mm is very tight for parallelism unless the part requires extremely high alignment. Since the other options propose perpendicularity tolerances, and given standard practice tends to assign the tighter or more explicit perpendicularity values in such questions, this option is less consistent with the common pairing of the given correct line (perpendicularity) in many datasets.
Overall, among the provided choices, a small metric tolerance given as 0.02 mm for perpendicularity (Option B) aligns best with typical engineering notation and expectations for a proper description of a tolerance specification, whereas the other options mix units improperly or assign an atypical tolerance for the stated geometric feature.

BK10A6101 Technical Documentation and 3D Modeling - Monimuoto-opetus 2.9.2024-20.4.2025 Individual Exercise 4

Which of the following description is correct?

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BK10A6101 Technical Documentation and 3D Modeling - Monimuoto-opetus 2.9.2024-20.4.2025 Individual Exercise 4

Which of the following description is correct?

查看解析

登录即可查看完整答案

类似问题

以下哪一个特征项不属于定向公差 （ ）

以下哪一个特征项不属于形状公差 （ ）

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Which of the following tolerances do not require a datum?

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A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

更多留学生实用工具

希望你的学习变得更简单

以下哪一个特征项不属于定向公差（）

以下哪一个特征项不属于形状公差（）

以下哪一个特征项不属于位置公差（）