Fundamentals of Manufacturing Processes (Multiple Choice) 201812 3
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The reason why it does not cause an excessive drop in the crankcase oil level of Freon compressors is . A. Excessive oil in the reservoir B. The piston oil-scraping ring is installed in the wrong direction C. The orifice of the automatic oil return needle valve in the oil separator is blocked D. Insufficient refrigerant circulation. Hint: Oil in the reservoir is soluble in the refrigerant.
C. Blockage of the valve hole in the automatic oil return needle valve of the lubricating oil separator