Which of the following drill sizes is equivalent to 2.0mm?

The correct option for the drill size that is equivalent to 2.0 mm is indeed 3/32. To understand why, it's useful to know the conversions between metric and imperial measurements. The metric measurement of 2.0 mm translates to approximately 0.0787 inches.

When converting common drill sizes from fractions to inches, 3/32 of an inch becomes 0.09375 inches, which is a bit larger than 2.0 mm, but, in terms of size assessments and practical applications, 3/32 is generally used where you might need a size close to that metric measurement for most practical drilling applications in aviation and manufacturing.

In contrast, the other options correspond to different drill sizes, with 1/8 inch being 0.125 inches, 13/64 inch being approximately 0.203125 inches, and 1/4 inch being 0.25 inches. These sizes do not match 2.0 mm and would not provide the same fit or perforation effect needed for precision tasks associated with Airframe & Powerplant applications.