True or False: The correct sizes for the two flanges, 1-1/2" 300 and 3" 150, are 1-1/4" and 1-1/16" respectively.

The assertion that the correct sizes for the two flanges, 1-1/2" 300 and 3" 150, are 1-1/4" and 1-1/16" respectively is not accurate. Flange sizes are generally determined by their nominal pipe size and pressure class, and they correspond to standardized dimensions.

For a 1-1/2" flange in the 300 lb class, the standard designation for the flange dimension is typically larger than 1-1/4". Similarly, for a 3" flange in the 150 lb class, the actual size would follow established standards and would not correspond to 1-1/16".

In summary, the expression of the flange sizes as 1-1/4" and 1-1/16" does not conform to the standard dimensions set for flanges of those designations. Therefore, the correct option reflects the need to understand standard flange sizes to avoid such discrepancies.