Question 13General Subjects - 1st Asst/Chief

The correct answer is B) manufacturer's numerical code. The size of ball and roller bearings is typically identified by the manufacturer's numerical code, which provides a standardized way to specify the bearing dimensions and characteristics. This numerical code is assigned by the bearing manufacturer and is the most reliable and common method for identifying the size of a particular bearing. The other answer choices are not the primary way to identify bearing size. The inner race cone width, outer ring width, and rolling member size can provide some information about the bearing, but they are not as universally recognized or as reliable as the manufacturer's numerical code for determining the overall bearing size.