Final answer:
In CAC-A gouging, the bottom contour is determined by the electrode orientation, which affects the gouge profile based on how the electrode is angled during cutting.
Step-by-step explanation:
In CAC-A (Carbon Arc Cutting with Air) gouging, the bottom contour is determined by the electrode orientation. This means that how the electrode is angled with respect to the workpiece can significantly alter the profile of the gouge created during the cutting process. It is therefore essential to correctly position the electrode to achieve the desired contour.
It's important for operators to be familiar with the appropriate electrode orientation for specific applications and materials to optimize the gouging process and achieve the desired results. The other options (A. Size, B. Shape, C. Material) may also influence the gouging process, but in the context of the question, electrode orientation is the primary factor determining the bottom contour.