1) heat flow from. a) hot to cold b) cold to hot c) hot to not d) cold to colder 2) it is the medium of heat transfer in refrigeration a) water b) refrigerant c) milk d) air 3) regulates the flow of refrigerant in the system a) compressor b) expansion valve c) condenser d) fan 4) heart of the refrigeration system a) switch b) valve c) compressor d) expansion valve 5) process of finding fault in the system a) troubleshooting b) fault finding c) error detecting d) grounding

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