Question 140Refrigeration & AC - QMED

The correct answer is D) high-pressure liquid line. The liquid indicator sight glass is generally located in the high-pressure liquid line of a refrigeration system. This allows the operator to visually inspect the refrigerant flowing through the system and determine if it is sufficiently charged. By observing the sight glass, the operator can see if the refrigerant is flowing as a liquid, which indicates that the system is charged correctly. The other answer choices are incorrect because the low-pressure vapor line, high-pressure vapor line, and low-pressure liquid line do not provide the same visual indication of the system's charge as the high-pressure liquid line.