You are trained on one machine but asked to help on a different machine you have used only a little. What is the BEST action?

Equipment varies, and operating a machine beyond your training can be unsafe and error-prone. The best response is to be honest about your experience level, ask for guidance or refresher training as needed, and then operate the equipment safely within your trained ability. Bluffing confidence, guessing at controls, or flatly refusing to help are all poorer choices. The exam rewards a balance of helpfulness and safety: being willing to assist while honestly communicating your training limits and getting proper instruction. This protects both the worker and the equipment while still supporting the team.