In a refrigeration system, the bulb for the thermal expansion valve is always located where?

Correct Answer: Option C — at the evaporator coil outlet

The thermal expansion valve bulb must be clamped securely to the evaporator coil outlet to accurately sense refrigerant superheat. This positioning ensures the valve regulates liquid refrigerant feed properly, preventing liquid slugging in the compressor while maximizing evaporator surface utilization per 46 CFR marine engineering standards.