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Q7.a) Sketch, describe and explain the operation of the domestic refrigeration system of a ship using one of the HFC as refrigerant. What kind of maintenance is essential for the system. (8)

b) Describe the causes for the following in the domestic refrigeration system

i) Frequent cut-in and cut-out of the compressor. (2)

ii) Lub oil low pressure cut-out of the compressor. (2)

iii) High pressure cut-out of the compressor. (2)

iv) Frosting in the compressor suction side. (2)