(a) Sketch, describe and explain the operation of the domestic refrigeration system of a ship using R 22 gas as refrigerant. What kind of maintenance is essential for the system. (8)

(b) Describe the causes for the following in the domestic refrigeration system: (8)

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

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

(iii) High pressure cut out of the compressor

(iv) Frosting in the compressor suction side