Which of the following options lists the four basic refrigerant circuit components used in a cooling/refrigeration system?

• A. Condenser, receiver, drier, compressor
• B. Evaporator, condenser, fan, filter
• C. Evaporator, compressor, condenser and expansion device
• D. Compressor, evaporator, condenser, drier

Answer: (C)

The main concept is that a cooling/refrigeration cycle relies on four essential components that the refrigerant passes through in sequence: evaporator, compressor, condenser, and expansion device. The evaporator absorbs heat from the space to be cooled, the compressor raises the refrigerant’s pressure and temperature, the condenser releases that heat to the surroundings, and the expansion device lowers the refrigerant’s pressure so it can again evaporate and absorb heat. Together, these four parts form the continuous loop that enables cooling.

The correct option lists exactly these four components, making it the best choice. The other options include components that support the system but aren’t part of the fundamental refrigerant loop. A receiver and drier, for example, are storage and moisture-removal devices rather than core cycle elements. A fan and filter are airflow and cleanliness aids, not primary refrigerant-path components. Another option includes a drier but omits the expansion device, which is essential to drop pressure and allow the refrigerant to evaporate again.

That’s why the fourth component (the expansion device) is included with the evaporator, condenser, and compressor in the correct answer.