Which of the following statements about shaft misalignment is true?

• A. It can be wholly eliminated with proper installation
• B. It can only be corrected in one plane
• C. It results in additional wear and tear
• D. It is a natural occurrence in all machines

Answer: (C)

Shaft misalignment refers to the condition where the shafts of two connected machines are not aligned correctly, which can occur due to a variety of factors such as thermal expansion, settling of equipment, or wear over time. The statement that it results in additional wear and tear is true because misalignment can cause uneven loading on bearings, increased friction, and additional stresses on components. These factors lead to premature failure of machinery parts, increased vibration, and energy loss, ultimately affecting the efficiency and lifespan of the equipment.

While proper installation can significantly reduce the likelihood of misalignment, it cannot be wholly eliminated since other external factors can still influence the alignment after installation. Correcting misalignment in machinery often involves addressing multiple planes and angles, rather than just one. Additionally, it is important to note that misalignment is not just an impediment but rather a common occurrence in machinery that is subjected to various operational stresses over time.