Question 225General Subjects - QMED

The correct answer is B) machinist's hand taps. The terms "plug," "bottom," and "taper" refer to the different types of machinist's hand taps used for creating internal threads in workpieces. Plug taps are used to start and cut threads, bottom taps are used to finish the threads at the bottom of a hole, and taper taps are used to gradually cut threads from the surface of the workpiece. The other options are incorrect as they do not accurately describe the usage of these specific terms in the context of a US Coast Guard Captain's License Examination. Pipe fittings, measuring instruments, and drill press parts do not typically use the terminology of "plug," "bottom," and "taper" in the same way as machinist's hand taps.