NCCER Millwright Practice Exam

A pneumatic system is specifically designed to utilize compressed air as a power source for operating tools and machinery. This function allows for a variety of applications, including pneumatic drills, impact wrenches, and other equipment that rely on airflow to achieve their operational goals.

The advantage of using compressed air in these systems includes the ability to maintain lightweight tools, ease of control, and instant power delivery, making it ideal for various industrial applications. Additionally, pneumatic systems are often safer because they produce less risk of electrical shock compared to electric or hydraulic systems.

The other options highlight different power sources, such as hydraulic fluids, electricity, and gasoline, which do not align with the specific function of a pneumatic system. By focusing on the use of compressed air, the correct answer encapsulates the unique operational characteristics and advantages that pneumatic systems provide in machinery.