Which line carries liquid refrigerant from the condenser to the metering device?

• A. Discharge
• B. Liquid
• C. Suction
• D. Expansion

Answer: (B)

In a vapor-compression refrigeration cycle, refrigerant state defines each line’s purpose. After the condenser, the refrigerant is a high‑pressure liquid and travels through the liquid line toward the metering device. This line is dedicated to carrying liquid refrigerant to be throttled by the metering device, which reduces its pressure before it enters the evaporator.

The other lines serve different states: the discharge line carries hot, high‑pressure gas from the compressor to the condenser, and the suction line carries low‑pressure vapor from the evaporator back to the compressor. Expansion occurs inside the metering device itself, not as a separate line.