Which of the following is not a given misalignment in mechanical systems?

In mechanical systems, misalignment can significantly affect the performance and lifespan of components like shafts and bearings. Among the listed options, "sheave" is not a type of misalignment but rather a mechanical component, often a wheel with a groove used to transmit power through a belt. Misalignments typically refer to the specific types of errors in the alignment of mechanical elements.

Angular misalignment describes an offset where shafts are misaligned at an angle, while parallel misalignment occurs when the shafts do not line up parallel to each other. Height misalignment refers to differences in vertical alignment between components. All these types are recognized issues in mechanical engineering that engineers must address to ensure proper system operation.

In contrast, sheaves themselves are integral parts of pulley systems and can contribute to misalignment if not properly aligned with their respective shafts, but they do not classify as a type of misalignment. This distinction clarifies why the correct answer to the question involves identifying sheave as a non-alignment issue.