Which of the following is an example of rotating machinery?

Rotating machinery refers to equipment that has parts capable of rotating or moving in a circular motion to perform a function. Drill presses are a prime example of this type of machinery because they feature a rotating drill bit that is powered to cut through materials like wood or metal. The drill bit's rotation is essential for executing the drilling process effectively, embodying the characteristic of rotating machinery.

In contrast, computers do not typically have rotating components associated with the general notion of machinery. Doors may swing or slide but are not classified as machinery that rotates for operational purposes. Storage shelves are static and designed for holding items in place, lacking any moving or rotating parts necessary for the definition of rotating machinery.