What is the main purpose of the written rules examination for employees?

The main purpose of the written rules examination for employees is to ensure knowledge of safety procedures. Safety procedures are crucial in thermite welding and other welding practices to prevent accidents and injuries. By assessing an employee's understanding of these procedures through a written examination, employers can confirm that workers are aware of potential hazards, know how to operate equipment safely, and understand the protocols necessary to maintain a secure work environment. This foundational knowledge is essential for creating a culture of safety within the workplace, thereby reducing the risk of incidents and ensuring compliance with industry standards.

In contrast, the other choices focus on different aspects that may not align directly with the primary objective of the examination. Limiting work hours pertains to labor regulations rather than safety, evaluating welding efficiency relates to skills assessment, and assessing physical capabilities is more about fitness for the job rather than knowledge about safety.