Fundamentals of Manufacturing Processes (Multiple Choice) 201812 2
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What causes the oil level in the crankcase of a Freon compressor to be too low is . A. Too much oil in the reservoir B. Insufficient refrigerant in the system C. Excessive operating time D. Too high evaporation temperature. Hint: The refrigerant does not evaporate completely in the evaporator, and the airflow velocity is low; as a result, the lubricating oil carried to the evaporator cannot return to the compressor.
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