Question 202Refrigeration & AC - Assistant Engineer

The correct answer is A) release of miscible refrigerant from the lubricant in the crankcase. Oil foaming in refrigeration practice refers to the release of refrigerant that has become dissolved or miscible in the lubricating oil within the compressor crankcase. This can happen when the refrigerant condenses into the oil, and then suddenly evaporates due to a change in pressure or temperature, causing the oil to foam up. The other options are incorrect because they do not accurately describe the phenomenon of oil foaming. Option B refers to the release of lubricant from the refrigerant, which is the opposite of what happens. Options C and D describe the evaporation of moisture or air, which are not directly related to the definition of oil foaming.