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Q4. W.R.T lubrication of reciprocating Freon refrigerating compressor, A. State with reason the characteristic of the lubricating oil in use in such a system, B. Discuss each of the following W.R.T., Cause effect and remedy - i. Copper plating; ii. Freon cloud point; iii. Freon floc point; C. Sketch a ship indirect refrigeration system arranged for cooling containers stowed in stacks in the hold.