With reference to the lubrication of refrigeration compressors: (a) State the advantage of using fully synthetic oils; (2) (b) Explain why oil may be carried over from the compressor; (3) (c) Describe a device which returns oil from the compressor discharge to the compressor sump; (3) (d) State TWO reasons why an accumulation of oil in the evaporator is undesirable. (2)
Reefer & A/C
UKM Tuticorin 
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