NCCER Millwright Practice Exam

What is commonly the size of the oxygen cylinder used for welding and cutting operations?

1. 125 cubic feet

2. 150 cubic feet

3. 227 cubic feet

4. 300 cubic feet

The correct answer is: 227 cubic feet

The most commonly used oxygen cylinder size for welding and cutting operations is typically 227 cubic feet. This size is well-suited for a variety of applications, providing a sufficient supply of oxygen for sustained work while still being manageable in terms of weight and portability. The 227 cubic foot cylinder strikes a balance between capacity and practical usage, making it an ideal choice for gas welding, cutting, and other related tasks. Larger cylinders, while they may hold more gas, are often less convenient to maneuver and transport on job sites, which can be a significant consideration for millwrights and welders working in various environments. Smaller sizes, such as 125 cubic feet or 150 cubic feet, may also be available but are less common for substantial welding tasks, as they require more frequent replacements or refills, which can disrupt workflow. Thus, the 227 cubic feet cylinder is the preferred option for most professionals in the field.