Question 74General Subjects - Assistant Engineer

The correct answer is B) 1/3 to 1/2. Roller bearings should be filled to 1/3 to 1/2 of their space cavity with the appropriate lubricant. This ensures the proper lubrication of the bearing components while allowing room for the lubricant to circulate and cool the bearing. Filling the bearing beyond 1/2 of its space could lead to excessive churning of the lubricant, resulting in increased friction and heat buildup, which can damage the bearing. The other answer choices are incorrect as they do not align with the recommended filling level for proper roller bearing operation and longevity.