Foaming of the oil in a refrigeration...

Question 1 / 270705eccef9ebacbc34ba4d46188

Question 1 of 270705eccef9ebacbc34ba4d46188

Foaming of the oil in a refrigeration compressor crankcase is caused by what condition?

Question 1 of 27070

Foaming of the oil in a refrigeration compressor crankcase is caused by what condition?

🔍 Key Concepts

• Behavior of refrigerant and oil when mixed in a crankcase • What happens when pressure or temperature changes on startup or after shutdown • Difference between boiling out of solution, condensing, and viscosity changes

💭 Think About

• Think about what happens to refrigerant that is dissolved in oil when the compressor starts and the crankcase pressure changes suddenly. • Which of these options would actually create bubbles/foam inside the oil, rather than just making it thicker or thinner? • Consider what physical process produces visible foaming: is it liquid turning to vapor, vapor turning to liquid, or a change in thickness of the oil?

✅ Before You Answer

• Identify which choice directly describes gas/vapor bubbles forming inside the oil. • Eliminate any choices that would make the oil less likely to bubble or foam. • Check which option most logically happens right after startup of a refrigeration compressor that has been idle.

Question 1 of 27070

Foaming of the oil in a refrigeration compressor crankcase is caused by what condition?

refrigerant boiling out of solution from the lube oil

refrigerant vapor condensing in the crankcase

lube oil viscosity being increased by refrigerant dilution

compressor suction pressure suddenly increasing

Question 1 / 270705eccef9ebacbc34ba4d46188

Question 1 of 270705eccef9ebacbc34ba4d46188

Foaming of the oil in a refrigeration compressor crankcase is caused by what condition?

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Question 1 of 27070

Foaming of the oil in a refrigeration compressor crankcase is caused by what condition?