Final answer:
Fixed, industrial-process heating equipment and motors are considered as machinery. Mechanical engineers are in charge of maintaining such machinery, using principles of physics and material science. They are essential for the nonstop function of manufacturing and industrial processes.
Step-by-step explanation:
Fixed, industrial-process heating equipment and motors should be considered as machinery. This categorization falls under the expertise of mechanical engineers, who focus on mechanical rather than human-related problems and apply physics principles of energy, force, and motion. Mechanical engineers may also develop new materials to construct such machinery and ensure it operates effectively and efficiently in industrial settings. Examples of such machinery include diesel engines, nuclear and coal power plants, electric motors, gas turbines, and even the complex equipment in smelters and metal industries. This equipment is essential to the continuous operation of manufacturing processes, as depicted in the narrative description of the ceaseless work in a manufacturing town with its unsleeping engines and fiery pools of metal.