🔍 Key Concepts

• Refrigerant behavior when it is in liquid form vs. vapor form inside the system • What happens when liquid refrigerant returns to or collects in the compressor crankcase instead of staying in the evaporator • The relationship between surface temperature and sweating/frosting on cold machinery parts

💭 Think About

• If the crankcase is cold enough to sweat or frost, what might be inside or around it causing that temperature drop? • Think about whether a shortage of refrigerant or oil would usually make metal parts colder or hotter during operation. • Which condition would most likely cause liquid – not just cold vapor – to be present at the compressor crankcase?

✅ Before You Answer

• Verify which option specifically mentions liquid refrigerant in the crankcase. • Consider that sweating/frosting requires a surface temperature below the dew point or freezing point of surrounding air – what system condition can cause that? • Eliminate choices that would more likely cause overheating rather than excessive cooling at the crankcase.