Which of the following trades is known for working with large machinery and is included in Entrance Exam 3?

The Heavy Equipment Technician is known for working with large machinery, focusing on the maintenance, repair, and overhaul of heavy equipment used in construction, mining, and other heavy industries. This trade requires specialized knowledge of both mechanical and electrical systems and the ability to troubleshoot complex machinery. Heavy Equipment Technicians often work with machines such as bulldozers, excavators, and cranes, which are integral to various industrial and construction activities.

The other trades listed have different focuses. Mechanical Engineers, for example, design and develop mechanical systems rather than work directly with heavy machinery; their expertise lies more in theory and design principles. Welders focus on joining materials, typically metals, but are more concerned with fabrication and construction processes rather than the machinery itself. HVAC Technicians specialize in heating, ventilation, and air conditioning systems, which while important, are not typically classified under the heavy machinery category. Thus, the Heavy Equipment Technician stands out as the correct choice.