Question 69Refrigeration & AC - QMED

The correct answer is B) the system contains less than a full charge of refrigerant. When a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion with the fluid flow, it indicates that the system is undercharged with refrigerant. This is because an undercharged system will have lower pressures and temperatures, causing some of the liquid refrigerant to vaporize and form gas bubbles as it flows through the indicator. The other answer choices are incorrect because: A) ice crystals are not the cause of the gas bubbles, C) a fully charged system would not exhibit this behavior, and D) air leakage would not directly result in gas bubbles in the liquid flow.