Question 688Steam Plants - Assistant Engineer

The correct answer is D) water from a mixture of oil liquids. In the context of oil purification, the term 'separation' refers to the process of removing water from a mixture of oil and water. This is a crucial step in maintaining the quality and performance of lubricating oils used in marine and industrial applications. The separation of water from oil is necessary to prevent corrosion, sludge formation, and other issues that can arise from the presence of water in the oil. The other answer choices are incorrect because they do not accurately describe the meaning of 'separation' in oil purification. Option A refers to the removal of additives from oil, option B refers to the removal of solids from lubricating oil, and option C refers to the removal of acid contaminants from oil, which are different processes from the separation of water from a mixture of oil liquids.