This worksheet is designed to be printed double sided. The first two pages are a blank student copy and the last two pages are filled in for the teacher copy. This worksheet can be discussed for about 30 minutes, and works well when you can point out the different parts on a physical machine in front of the students. The sheet is also able to be projected onto a whiteboard or other surface and students can come up and write the answers as a class before completing their own worksheet.
I developed this for use as a Machine Competency record. When students are able to answer all of the questions and correctly label the diagram, then they are able to use the machine.