A typical shipboard domestic multi-box refrigeration system operates with one compressor and condenser. What is the purpose of the sensing line connected to the thermal bulb at the evaporator coil outlet?

Correct Answer: Option B — To transmit the bulb pressure (proportional to the coil temperature) to the thermal expansion valve diaphragm.

Under USCG National Maritime Center examination standards, the accepted correct answer is: To transmit the bulb pressure (proportional to the coil temperature) to the thermal expansion valve diaphragm..