In wire drawing operations, the maximum reduction per pass for a perfectly plastic material in ideal conditions is 63%. This is derived from the theoretical limit for plastic deformation where the material does not exhibit strain hardening. In this idealized scenario, the material behaves as a perfect plastic, and the maximum possible reduction in cross-sectional area in one pass is 63%.
- 30%, 45%, and 50% are lower values and do not represent the maximum reduction in the ideal condition. These values may apply in practical scenarios where strain hardening and other effects influence the process.
Thus, the correct answer is (3), 63%.