Which of the following lists represents the four main components of a refrigeration system?

• A. Compandium Tube, Cooler, Hot Coil, and Compressor
• B. Compressor, Condenser, Evaporator, and Metering Device
• C. Eliminator, Pressure-Enthalpy Device, Refrigerant, and Oil Separator
• D. Receiver, Sight Glass, Accumulator, and Compressor

Answer: (B)

The idea being tested is identifying the four essential parts that make the refrigeration cycle work. The system relies on a compressor to push refrigerant through the loop, a condenser to reject heat and turn that high-pressure gas into a liquid, a metering device to throttle the liquid and create the necessary pressure drop, and an evaporator where the refrigerant absorbs heat and boils back into a low-pressure gas to return to the compressor. Together, these components handle compression, condensation, throttling, and evaporation, forming a continuous cycle that moves heat from the space being cooled to the surroundings.

Other options mix in components that aren’t part of the four main cycle elements. Terms like compandium tube or hot coil aren’t standard parts of the fundamental refrigeration loop, and terms such as receiver, sight glass, and accumulator refer to auxiliary functions or storage rather than the core cycle. An option listing an oil separator or a pressure-enthalpy device similarly includes items not identified as the four core components. The correct set includes the compressor, condenser, metering device, and evaporator, which together enable the complete heating/cooling cycle.