Basic Refrigeration Practice Exam

The compressor’s job is to compress refrigerant vapor, raising its pressure (and temperature) so it can reject heat in the condenser. The cycle starts with the refrigerant as a low‑pressure vapor after the evaporator; the compressor elevates it to high pressure vapor that then flows to the condenser. The other descriptions refer to phase changes that happen in the evaporator (liquid to vapor) or in the condenser (vapor to liquid), not what the compressor does.