Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? (A) A) Head gasket on discharge side (B) B) Rotating shaft seal (C) C) Suction service valve (D) D) One or both of the king valves

In a belt-driven non-hermetic compressor that has not been used for several months, the most likely part to leak is: (B) Rotating shaft seal ### Explanation: 1. **Rotating Shaft Seal**: This seal is designed to prevent refrigerant from leaking out where the rotating shaft exits the compressor. Over time, especially when the compressor is not in use, the seal can dry out or become brittle, leading to leaks. 2. **Head Gasket on Discharge Side**: While this can also be a potential leak point, it is less likely to leak compared to the rotating shaft seal after a long period of inactivity. 3. **Suction Service Valve**: This valve can leak, but it is generally less prone to leakage than the rotating shaft seal, especially if it has been properly maintained. 4. **King Valves**: These valves can also leak, but again, they are not as commonly associated with leaks after a long period of inactivity compared to the rotating shaft seal. Thus, the rotating shaft seal is the most likely candidate for leakage in this scenario.