Double trunk pistons are used in some...

Question 1 / 270705eccef9dbacbc34ba4d45f4d

Question 1 of 270705eccef9dbacbc34ba4d45f4d

Double trunk pistons are used in some refrigeration compressors to reduce oil foaming in the crankcase by what means?

Question 1 of 27070

Double trunk pistons are used in some refrigeration compressors to reduce oil foaming in the crankcase by what means?

🔍 Key Concepts

• Function of a double trunk piston in a refrigeration compressor • How refrigerant and lubricating oil behave together in a crankcase • Causes of oil foaming when a compressor starts or runs

💭 Think About

• Ask yourself: What specifically makes oil foam when refrigerant is dissolved in it, and what design change would reduce that interaction? • Consider whether higher pressure, higher efficiency, or reduced contact between fluids would directly affect foaming in the crankcase. • Think about what a shaft seal does—does removing it have any logical connection to foam formation in the crankcase?

✅ Before You Answer

• Which choice directly addresses refrigerant–oil contact in the crankcase rather than general compressor performance? • Eliminate any options that talk about efficiency or pressure but do not clearly relate to foaming behavior. • Confirm which option describes a design feature that would physically separate or limit mixing of refrigerant and oil.

Question 1 of 27070

Double trunk pistons are used in some refrigeration compressors to reduce oil foaming in the crankcase by what means?

increasing compressor volumetric efficiency

producing higher compression pressures

minimizing free contact between refrigerant and oil in the crankcase

eliminating the need for a shaft seal

Question 1 / 270705eccef9dbacbc34ba4d45f4d

Question 1 of 270705eccef9dbacbc34ba4d45f4d

Double trunk pistons are used in some refrigeration compressors to reduce oil foaming in the crankcase by what means?

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Question 1 of 27070

Double trunk pistons are used in some refrigeration compressors to reduce oil foaming in the crankcase by what means?